Update JPEG library to v8b.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8425 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
parent
5d1669e273
commit
1216e9530f
@ -831,7 +831,95 @@
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@ -1578,50 +1666,6 @@
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@ -2062,50 +2106,6 @@
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@ -336,7 +336,35 @@
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@ -574,20 +602,6 @@
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<FavorSizeOrSpeed Condition="'$(Configuration)|$(Platform)'=='Release Cairo|Win32'">Neither</FavorSizeOrSpeed>
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@ -728,20 +742,6 @@
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<Optimization Condition="'$(Configuration)|$(Platform)'=='Debug Cairo|Win32'">Disabled</Optimization>
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<AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Debug Cairo|Win32'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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|
@ -91,6 +91,14 @@ SOURCE=..\..\jpeg\jcapistd.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jaricom.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcarith.c
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||||
# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jccoefct.c
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# End Source File
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# Begin Source File
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@ -131,10 +139,6 @@ SOURCE=..\..\jpeg\jcparam.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcphuff.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcprepct.c
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# End Source File
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# Begin Source File
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@ -155,6 +159,10 @@ SOURCE=..\..\jpeg\jdapistd.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdarith.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdatadst.c
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# End Source File
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# Begin Source File
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@ -199,10 +207,6 @@ SOURCE=..\..\jpeg\jdmerge.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdphuff.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdpostct.c
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# End Source File
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# Begin Source File
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@ -243,10 +247,6 @@ SOURCE=..\..\jpeg\jidctint.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jidctred.c
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jmemmgr.c
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# End Source File
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# Begin Source File
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@ -91,6 +91,18 @@ LINK32=link.exe
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# Name "fltk_jpegdll - Win32 Debug"
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# Begin Source File
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SOURCE=..\..\jpeg\jaricom.c
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DEP_CPP_JCPHU=\
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"..\..\jpeg\jconfig.h"\
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"..\..\jpeg\jerror.h"\
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"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
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"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcapimin.c
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DEP_CPP_JCAPI=\
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"..\..\jpeg\jconfig.h"\
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@ -115,6 +127,18 @@ DEP_CPP_JCAPIS=\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcarith.c
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DEP_CPP_JCPHU=\
|
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"..\..\jpeg\jconfig.h"\
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"..\..\jpeg\jerror.h"\
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"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
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"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jccoefct.c
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DEP_CPP_JCCOE=\
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"..\..\jpeg\jconfig.h"\
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@ -237,19 +261,6 @@ DEP_CPP_JCPAR=\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcphuff.c
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DEP_CPP_JCPHU=\
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"..\..\jpeg\jchuff.h"\
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"..\..\jpeg\jconfig.h"\
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"..\..\jpeg\jerror.h"\
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"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
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"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jcprepct.c
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DEP_CPP_JCPRE=\
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"..\..\jpeg\jconfig.h"\
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@ -310,6 +321,18 @@ DEP_CPP_JDAPIS=\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdarith.c
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DEP_CPP_JCPHU=\
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"..\..\jpeg\jconfig.h"\
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||||
"..\..\jpeg\jerror.h"\
|
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"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
|
||||
"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdatadst.c
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DEP_CPP_JDATA=\
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"..\..\jpeg\jconfig.h"\
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@ -444,19 +467,6 @@ DEP_CPP_JDMER=\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdphuff.c
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DEP_CPP_JDPHU=\
|
||||
"..\..\jpeg\jconfig.h"\
|
||||
"..\..\jpeg\jdhuff.h"\
|
||||
"..\..\jpeg\jerror.h"\
|
||||
"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
|
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"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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||||
# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jdpostct.c
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||||
DEP_CPP_JDPOS=\
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||||
"..\..\jpeg\jconfig.h"\
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@ -584,19 +594,6 @@ DEP_CPP_JIDCTI=\
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||||
# End Source File
|
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# Begin Source File
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SOURCE=..\..\jpeg\jidctred.c
|
||||
DEP_CPP_JIDCTR=\
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||||
"..\..\jpeg\jconfig.h"\
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"..\..\jpeg\jdct.h"\
|
||||
"..\..\jpeg\jerror.h"\
|
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"..\..\jpeg\jinclude.h"\
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"..\..\jpeg\jmorecfg.h"\
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"..\..\jpeg\jpegint.h"\
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"..\..\jpeg\jpeglib.h"\
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# End Source File
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# Begin Source File
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SOURCE=..\..\jpeg\jmemmgr.c
|
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DEP_CPP_JMEMM=\
|
||||
"..\..\jpeg\jconfig.h"\
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|
@ -90,6 +90,14 @@
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AD6E04F6F1B72EB797867D80 /* tile.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = tile.app; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
ADA5BC653C9EFBEAA8C0AD29 /* CubeViewUI.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.fluid; name = CubeViewUI.fl; path = ../../test/CubeViewUI.fl; sourceTree = SOURCE_ROOT; };
|
||||
ADA5BC653C9EFBEAA8C0AD29 /* CubeViewUI.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = CubeViewUI.fl; path = ../../test/CubeViewUI.fl; sourceTree = SOURCE_ROOT; };
|
||||
ADC532751F27C32E46DEFF6F /* pngtrans.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = pngtrans.c; path = ../../png/pngtrans.c; sourceTree = SOURCE_ROOT; };
|
||||
AE1717E43F50EBA343960B1E /* Fl_Hor_Slider.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Hor_Slider.H; path = ../../FL/Fl_Hor_Slider.H; sourceTree = SOURCE_ROOT; };
|
||||
AF65626F49A71525D24ED1B0 /* filename.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = filename.H; path = ../../FL/filename.H; sourceTree = SOURCE_ROOT; };
|
||||
@ -4511,7 +4523,7 @@
|
||||
D02CF2893ECCE831CD5D3176 /* Fl_Multi_Label.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Multi_Label.cxx; path = ../../src/Fl_Multi_Label.cxx; sourceTree = SOURCE_ROOT; };
|
||||
D06E371A971A3BC1B399AD78 /* button.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = button.cxx; path = ../../test/button.cxx; sourceTree = SOURCE_ROOT; };
|
||||
D0E376E93B4F22BE701D29E0 /* Fl_Roller.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Roller.cxx; path = ../../src/Fl_Roller.cxx; sourceTree = SOURCE_ROOT; };
|
||||
D10B1EA053B5C8F02A636D93 /* tree.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.fluid; name = tree.fl; path = ../../test/tree.fl; sourceTree = SOURCE_ROOT; };
|
||||
D10B1EA053B5C8F02A636D93 /* tree.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = tree.fl; path = ../../test/tree.fl; sourceTree = SOURCE_ROOT; };
|
||||
D1C792936D427CC48581BFAE /* Fl_Overlay_Window.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Overlay_Window.cxx; path = ../../src/Fl_Overlay_Window.cxx; sourceTree = SOURCE_ROOT; };
|
||||
D2DE1079C826533A91053A9C /* Fl_XBM_Image.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_XBM_Image.H; path = ../../FL/Fl_XBM_Image.H; sourceTree = SOURCE_ROOT; };
|
||||
D33C668435685F7CCB359EE2 /* pngrio.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = pngrio.c; path = ../../png/pngrio.c; sourceTree = SOURCE_ROOT; };
|
||||
@ -4574,7 +4586,7 @@
|
||||
E7C720E51DAC292F13358811 /* Fl_Gl_Window.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Gl_Window.H; path = ../../FL/Fl_Gl_Window.H; sourceTree = SOURCE_ROOT; };
|
||||
E82932DF2A0C624C6EDC9207 /* Fl_Tile.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Tile.cxx; path = ../../src/Fl_Tile.cxx; sourceTree = SOURCE_ROOT; };
|
||||
E82DD2B5676CF315E945AF23 /* Fl_FormsBitmap.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_FormsBitmap.H; path = ../../FL/Fl_FormsBitmap.H; sourceTree = SOURCE_ROOT; };
|
||||
E840F8E478F4C8C6038E235B /* resize.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.fluid; name = resize.fl; path = ../../test/resize.fl; sourceTree = SOURCE_ROOT; };
|
||||
E840F8E478F4C8C6038E235B /* resize.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = resize.fl; path = ../../test/resize.fl; sourceTree = SOURCE_ROOT; };
|
||||
E887B4AE75EC9D885D592636 /* fluid.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = fluid.cxx; path = ../../fluid/fluid.cxx; sourceTree = SOURCE_ROOT; };
|
||||
E8D790E9361D2B311B6839B1 /* pixmap.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = pixmap.cxx; path = ../../test/pixmap.cxx; sourceTree = SOURCE_ROOT; };
|
||||
E917C15E28EE293416A38C5E /* fltk_images.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = fltk_images.framework; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
@ -4591,7 +4603,6 @@
|
||||
EC57889382FB898FD3EF2580 /* Fl_Gl_Window.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Gl_Window.cxx; path = ../../src/Fl_Gl_Window.cxx; sourceTree = SOURCE_ROOT; };
|
||||
EC5862E1FC79542DC55D8462 /* colbrowser.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = colbrowser.cxx; path = ../../test/colbrowser.cxx; sourceTree = SOURCE_ROOT; };
|
||||
ECFF712363202EC351A51E53 /* Fl_PNM_Image.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_PNM_Image.cxx; path = ../../src/Fl_PNM_Image.cxx; sourceTree = SOURCE_ROOT; };
|
||||
EDCB878D48197F6AE1C99614 /* jidctred.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = jidctred.c; path = ../../jpeg/jidctred.c; sourceTree = SOURCE_ROOT; };
|
||||
EDE6CE6B09D31AC0AAC9FF56 /* fullscreen.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = fullscreen.cxx; path = ../../test/fullscreen.cxx; sourceTree = SOURCE_ROOT; };
|
||||
EE2FB1F7B99BE408E1B4DFB7 /* Fl_Object.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Object.H; path = ../../FL/Fl_Object.H; sourceTree = SOURCE_ROOT; };
|
||||
EE6507EFCDDA13ACF9373E3E /* Fl_Hor_Fill_Slider.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Hor_Fill_Slider.H; path = ../../FL/Fl_Hor_Fill_Slider.H; sourceTree = SOURCE_ROOT; };
|
||||
@ -4602,7 +4613,6 @@
|
||||
F0F281028A82F2E8C2070B26 /* cursor.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = cursor.app; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
F123133D8A3AD430ED07DF17 /* jdcolor.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = jdcolor.c; path = ../../jpeg/jdcolor.c; sourceTree = SOURCE_ROOT; };
|
||||
F1C4032FB66042A96955A62E /* Fl_Value_Output.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Value_Output.cxx; path = ../../src/Fl_Value_Output.cxx; sourceTree = SOURCE_ROOT; };
|
||||
F20C125E79B7CC1F5109248C /* jdphuff.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = jdphuff.c; path = ../../jpeg/jdphuff.c; sourceTree = SOURCE_ROOT; };
|
||||
F2E5612A81A6E8D53ED91CAE /* Fl_Slider.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Slider.H; path = ../../FL/Fl_Slider.H; sourceTree = SOURCE_ROOT; };
|
||||
F319551D961725F0949D0235 /* ask.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = ask.cxx; path = ../../test/ask.cxx; sourceTree = SOURCE_ROOT; };
|
||||
F397A185D11C3DED903CB99F /* Fl_Chart.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Fl_Chart.cxx; path = ../../src/Fl_Chart.cxx; sourceTree = SOURCE_ROOT; };
|
||||
@ -4627,7 +4637,7 @@
|
||||
FBB2C3FCFF8322A237DDBE23 /* fl_set_font.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = fl_set_font.cxx; path = ../../src/fl_set_font.cxx; sourceTree = SOURCE_ROOT; };
|
||||
FC940D10359580615C166335 /* shape.cxx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = shape.cxx; path = ../../test/shape.cxx; sourceTree = SOURCE_ROOT; };
|
||||
FD1BB104911A6726B02EEE37 /* Fl_Radio_Round_Button.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Radio_Round_Button.H; path = ../../FL/Fl_Radio_Round_Button.H; sourceTree = SOURCE_ROOT; };
|
||||
FE29497A25C52BC2F7D5A9D4 /* inactive.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.fluid; name = inactive.fl; path = ../../test/inactive.fl; sourceTree = SOURCE_ROOT; };
|
||||
FE29497A25C52BC2F7D5A9D4 /* inactive.fl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = inactive.fl; path = ../../test/inactive.fl; sourceTree = SOURCE_ROOT; };
|
||||
FE466F26BF6C316E5A1770E6 /* jccolor.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = jccolor.c; path = ../../jpeg/jccolor.c; sourceTree = SOURCE_ROOT; };
|
||||
FE90AA3BB40510FA45E0C27B /* Fl_Bitmap.H */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Fl_Bitmap.H; path = ../../FL/Fl_Bitmap.H; sourceTree = SOURCE_ROOT; };
|
||||
FEB0F8FE6383384180570D94 /* fltk.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = fltk.framework; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
@ -6075,6 +6085,14 @@
|
||||
A07416CF2BF150F093A0F9AD /* fltk_jpeg */ = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
273EA935130ACF91000D6870 /* jaricom.c */,
|
||||
273EA936130ACF91000D6870 /* jcarith.c */,
|
||||
273EA937130ACF91000D6870 /* jdarith.c */,
|
||||
273EA938130ACF91000D6870 /* jdct.h */,
|
||||
273EA939130ACF91000D6870 /* jinclude.h */,
|
||||
273EA93A130ACF91000D6870 /* jmemsys.h */,
|
||||
273EA93B130ACF91000D6870 /* jpegint.h */,
|
||||
273EA93C130ACF91000D6870 /* jversion.h */,
|
||||
C9EDD4E21274BB7C00ADB21C /* Headers */,
|
||||
37EC93410A76CE3EB094F162 /* jcapimin.c */,
|
||||
0C4D02EC5E80D2BF56CFB48B /* jcapistd.c */,
|
||||
@ -6088,7 +6106,6 @@
|
||||
D77F126A951A15185214FF2E /* jcmaster.c */,
|
||||
5CD5D087391E39030838C823 /* jcomapi.c */,
|
||||
7DF4AD3769671959EA813845 /* jcparam.c */,
|
||||
7A76AE49F30DFB877BA43A02 /* jcphuff.c */,
|
||||
14AA766D5DA5A8BCFF60B626 /* jcprepct.c */,
|
||||
65E1ABE72414529CBD1F937C /* jcsample.c */,
|
||||
E4337D2D7CEEDCAD78B068E5 /* jctrans.c */,
|
||||
@ -6105,7 +6122,6 @@
|
||||
BB37899B104B362F32F0F417 /* jdmarker.c */,
|
||||
28AFF174A53E38CCB7475C19 /* jdmaster.c */,
|
||||
C84F99F5AC8C6517F45055B0 /* jdmerge.c */,
|
||||
F20C125E79B7CC1F5109248C /* jdphuff.c */,
|
||||
4D4D056FC1F1EFEC7585CA17 /* jdpostct.c */,
|
||||
5538B949B47F04D03589F2CE /* jdsample.c */,
|
||||
4577F046D6D5D93D2553BFBC /* jdtrans.c */,
|
||||
@ -6116,7 +6132,6 @@
|
||||
377C68AADE10A3244413CFF6 /* jidctflt.c */,
|
||||
2B5CC86924C64E849EBE0179 /* jidctfst.c */,
|
||||
33F18D02CA150D5654D48366 /* jidctint.c */,
|
||||
EDCB878D48197F6AE1C99614 /* jidctred.c */,
|
||||
E618B793B357747DC837667E /* jmemmgr.c */,
|
||||
D3E25408466639AACEF4D2A6 /* jmemnobs.c */,
|
||||
DD96B70D85E60B641F061D51 /* jquant1.c */,
|
||||
@ -6694,6 +6709,11 @@
|
||||
buildActionMask = 2147483647;
|
||||
files = (
|
||||
C95961881274CEA1009C0594 /* README.Xcode in Headers */,
|
||||
273EA940130ACF91000D6870 /* jdct.h in Headers */,
|
||||
273EA941130ACF91000D6870 /* jinclude.h in Headers */,
|
||||
273EA942130ACF91000D6870 /* jmemsys.h in Headers */,
|
||||
273EA943130ACF91000D6870 /* jpegint.h in Headers */,
|
||||
273EA944130ACF91000D6870 /* jversion.h in Headers */,
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
@ -9737,7 +9757,6 @@
|
||||
365C8ABAB40CA4E4F4DE497B /* jcmaster.c in Sources */,
|
||||
FB64FC6F7054A5B50F2C3344 /* jcomapi.c in Sources */,
|
||||
6405302969D2F33411D220BA /* jcparam.c in Sources */,
|
||||
7091A9422A9360F48A65B790 /* jcphuff.c in Sources */,
|
||||
39755B7CD55E28BE048D5743 /* jcprepct.c in Sources */,
|
||||
7B95C9D17987D8A4E6951C8E /* jcsample.c in Sources */,
|
||||
387225B73ACF720C07465CC1 /* jctrans.c in Sources */,
|
||||
@ -9754,7 +9773,6 @@
|
||||
BD48B8B0B3DE04E72A17F60D /* jdmarker.c in Sources */,
|
||||
11AAF790D7EBFBC6565962F3 /* jdmaster.c in Sources */,
|
||||
F77512958607662BAA15DA70 /* jdmerge.c in Sources */,
|
||||
F4B47F14754880CE01415BE4 /* jdphuff.c in Sources */,
|
||||
48E16D81DEAAD2BD2F01C0A2 /* jdpostct.c in Sources */,
|
||||
5EDF60DDCDC6919CF0165574 /* jdsample.c in Sources */,
|
||||
88C021DD6A74CF51B3C5F8D5 /* jdtrans.c in Sources */,
|
||||
@ -9765,12 +9783,14 @@
|
||||
0F15FD350AAEC543A5A9E462 /* jidctflt.c in Sources */,
|
||||
3680B81A8A377F872BA42B8C /* jidctfst.c in Sources */,
|
||||
8A3AEEE3EEDBB52D79AF606A /* jidctint.c in Sources */,
|
||||
916E94D46FCF743D6CC07005 /* jidctred.c in Sources */,
|
||||
B9B2EDBADB95D97D474797A0 /* jmemmgr.c in Sources */,
|
||||
B054ACC849A1BEDD69CB70C5 /* jmemnobs.c in Sources */,
|
||||
6D8F8E2E6F8039FE4B127D31 /* jquant1.c in Sources */,
|
||||
F9C96700B8B44B5E3F736E66 /* jquant2.c in Sources */,
|
||||
4FD74129390D07ED56265A84 /* jutils.c in Sources */,
|
||||
273EA93D130ACF91000D6870 /* jaricom.c in Sources */,
|
||||
273EA93E130ACF91000D6870 /* jcarith.c in Sources */,
|
||||
273EA93F130ACF91000D6870 /* jdarith.c in Sources */,
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
|
@ -12,22 +12,22 @@ set(systemdependent_SRCS jmemnobs.c)
|
||||
|
||||
# library object files common to compression and decompression
|
||||
set(common_SRCS
|
||||
jcomapi.c jutils.c jerror.c jmemmgr.c
|
||||
jaricom.c jcomapi.c jutils.c jerror.c jmemmgr.c
|
||||
)
|
||||
|
||||
# compression library object files
|
||||
set(compression_SRCS
|
||||
jcapimin.c jcapistd.c jctrans.c jcparam.c jdatadst.c jcinit.c
|
||||
jcapimin.c jcapistd.c jcarith.c jctrans.c jcparam.c jdatadst.c jcinit.c
|
||||
jcmaster.c jcmarker.c jcmainct.c jcprepct.c jccoefct.c jccolor.c
|
||||
jcsample.c jchuff.c jcphuff.c jcdctmgr.c jfdctfst.c jfdctflt.c
|
||||
jcsample.c jchuff.c jcdctmgr.c jfdctfst.c jfdctflt.c
|
||||
jfdctint.c
|
||||
)
|
||||
|
||||
# decompression library object files
|
||||
set(decompression_SRCS
|
||||
jdapimin.c jdapistd.c jdtrans.c jdatasrc.c jdmaster.c
|
||||
jdinput.c jdmarker.c jdhuff.c jdphuff.c jdmainct.c jdcoefct.c
|
||||
jdpostct.c jddctmgr.c jidctfst.c jidctflt.c jidctint.c jidctred.c
|
||||
jdapimin.c jdapistd.c jdarith.c jdtrans.c jdatasrc.c jdmaster.c
|
||||
jdinput.c jdmarker.c jdhuff.c jdmainct.c jdcoefct.c
|
||||
jdpostct.c jddctmgr.c jidctfst.c jidctflt.c jidctint.c
|
||||
jdsample.c jdcolor.c jquant1.c jquant2.c jdmerge.c
|
||||
)
|
||||
|
||||
|
@ -3,7 +3,7 @@
|
||||
#
|
||||
# JPEG library makefile for the Fast Light Toolkit (FLTK).
|
||||
#
|
||||
# Copyright 1997-2009 by Easy Software Products.
|
||||
# Copyright 1997-2011 by Bill Spitzak and others.
|
||||
#
|
||||
# This library is free software; you can redistribute it and/or
|
||||
# modify it under the terms of the GNU Library General Public
|
||||
@ -32,16 +32,53 @@ include ../makeinclude
|
||||
# Object files...
|
||||
#
|
||||
|
||||
OBJS = jmemnobs.o \
|
||||
jcapimin.o jcapistd.o jccoefct.o jccolor.o jcdctmgr.o \
|
||||
jchuff.o jcinit.o jcmainct.o jcmarker.o jcmaster.o jcomapi.o \
|
||||
jcparam.o jcphuff.o jcprepct.o jcsample.o jctrans.o \
|
||||
jdapimin.o jdapistd.o jdatadst.o jdatasrc.o jdcoefct.o \
|
||||
jdcolor.o jddctmgr.o jdhuff.o jdinput.o jdmainct.o jdmarker.o \
|
||||
jdmaster.o jdmerge.o jdphuff.o jdpostct.o jdsample.o \
|
||||
jdtrans.o jerror.o jfdctflt.o jfdctfst.o jfdctint.o \
|
||||
jidctflt.o jidctfst.o jidctint.o jidctred.o jquant1.o \
|
||||
jquant2.o jutils.o jmemmgr.o
|
||||
OBJS = \
|
||||
jaricom.o \
|
||||
jcapimin.o \
|
||||
jcapistd.o \
|
||||
jcarith.o \
|
||||
jccoefct.o \
|
||||
jccolor.o \
|
||||
jcdctmgr.o \
|
||||
jchuff.o \
|
||||
jcinit.o \
|
||||
jcmainct.o \
|
||||
jcmarker.o \
|
||||
jcmaster.o \
|
||||
jcomapi.o \
|
||||
jcparam.o \
|
||||
jcprepct.o \
|
||||
jcsample.o \
|
||||
jctrans.o \
|
||||
jdapimin.o \
|
||||
jdapistd.o \
|
||||
jdarith.o \
|
||||
jdatadst.o \
|
||||
jdatasrc.o \
|
||||
jdcoefct.o \
|
||||
jdcolor.o \
|
||||
jddctmgr.o \
|
||||
jdhuff.o \
|
||||
jdinput.o \
|
||||
jdmainct.o \
|
||||
jdmarker.o \
|
||||
jdmaster.o \
|
||||
jdmerge.o \
|
||||
jdpostct.o \
|
||||
jdsample.o \
|
||||
jdtrans.o \
|
||||
jerror.o \
|
||||
jfdctflt.o \
|
||||
jfdctfst.o \
|
||||
jfdctint.o \
|
||||
jidctflt.o \
|
||||
jidctfst.o \
|
||||
jidctint.o \
|
||||
jmemmgr.o \
|
||||
jmemnobs.o \
|
||||
jquant1.o \
|
||||
jquant2.o \
|
||||
jutils.o
|
||||
|
||||
LIBJPEG = ../lib/libfltk_jpeg$(LIBEXT)
|
||||
|
||||
|
277
jpeg/README
277
jpeg/README
@ -1,22 +1,17 @@
|
||||
The Independent JPEG Group's JPEG software
|
||||
==========================================
|
||||
|
||||
README for release 6b of 27-Mar-1998
|
||||
README for release 8b of 16-May-2010
|
||||
====================================
|
||||
|
||||
This distribution contains the sixth public release of the Independent JPEG
|
||||
This distribution contains the eighth public release of the Independent JPEG
|
||||
Group's free JPEG software. You are welcome to redistribute this software and
|
||||
to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
|
||||
|
||||
Serious users of this software (particularly those incorporating it into
|
||||
larger programs) should contact IJG at jpeg-info@uunet.uu.net to be added to
|
||||
our electronic mailing list. Mailing list members are notified of updates
|
||||
and have a chance to participate in technical discussions, etc.
|
||||
|
||||
This software is the work of Tom Lane, Philip Gladstone, Jim Boucher,
|
||||
Lee Crocker, Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi,
|
||||
Guido Vollbeding, Ge' Weijers, and other members of the Independent JPEG
|
||||
Group.
|
||||
This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone,
|
||||
Bill Allombert, Jim Boucher, Lee Crocker, Bob Friesenhahn, Ben Jackson,
|
||||
Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
|
||||
and other members of the Independent JPEG Group.
|
||||
|
||||
IJG is not affiliated with the official ISO JPEG standards committee.
|
||||
|
||||
@ -30,27 +25,27 @@ OVERVIEW General description of JPEG and the IJG software.
|
||||
LEGAL ISSUES Copyright, lack of warranty, terms of distribution.
|
||||
REFERENCES Where to learn more about JPEG.
|
||||
ARCHIVE LOCATIONS Where to find newer versions of this software.
|
||||
RELATED SOFTWARE Other stuff you should get.
|
||||
ACKNOWLEDGMENTS Special thanks.
|
||||
FILE FORMAT WARS Software *not* to get.
|
||||
TO DO Plans for future IJG releases.
|
||||
|
||||
Other documentation files in the distribution are:
|
||||
|
||||
User documentation:
|
||||
install.doc How to configure and install the IJG software.
|
||||
usage.doc Usage instructions for cjpeg, djpeg, jpegtran,
|
||||
install.txt How to configure and install the IJG software.
|
||||
usage.txt Usage instructions for cjpeg, djpeg, jpegtran,
|
||||
rdjpgcom, and wrjpgcom.
|
||||
*.1 Unix-style man pages for programs (same info as usage.doc).
|
||||
wizard.doc Advanced usage instructions for JPEG wizards only.
|
||||
*.1 Unix-style man pages for programs (same info as usage.txt).
|
||||
wizard.txt Advanced usage instructions for JPEG wizards only.
|
||||
change.log Version-to-version change highlights.
|
||||
Programmer and internal documentation:
|
||||
libjpeg.doc How to use the JPEG library in your own programs.
|
||||
libjpeg.txt How to use the JPEG library in your own programs.
|
||||
example.c Sample code for calling the JPEG library.
|
||||
structure.doc Overview of the JPEG library's internal structure.
|
||||
filelist.doc Road map of IJG files.
|
||||
coderules.doc Coding style rules --- please read if you contribute code.
|
||||
structure.txt Overview of the JPEG library's internal structure.
|
||||
filelist.txt Road map of IJG files.
|
||||
coderules.txt Coding style rules --- please read if you contribute code.
|
||||
|
||||
Please read at least the files install.doc and usage.doc. Useful information
|
||||
Please read at least the files install.txt and usage.txt. Some information
|
||||
can also be found in the JPEG FAQ (Frequently Asked Questions) article. See
|
||||
ARCHIVE LOCATIONS below to find out where to obtain the FAQ article.
|
||||
|
||||
@ -62,24 +57,15 @@ the order listed) before diving into the code.
|
||||
OVERVIEW
|
||||
========
|
||||
|
||||
This package contains C software to implement JPEG image compression and
|
||||
decompression. JPEG (pronounced "jay-peg") is a standardized compression
|
||||
method for full-color and gray-scale images. JPEG is intended for compressing
|
||||
"real-world" scenes; line drawings, cartoons and other non-realistic images
|
||||
are not its strong suit. JPEG is lossy, meaning that the output image is not
|
||||
exactly identical to the input image. Hence you must not use JPEG if you
|
||||
have to have identical output bits. However, on typical photographic images,
|
||||
very good compression levels can be obtained with no visible change, and
|
||||
remarkably high compression levels are possible if you can tolerate a
|
||||
low-quality image. For more details, see the references, or just experiment
|
||||
with various compression settings.
|
||||
This package contains C software to implement JPEG image encoding, decoding,
|
||||
and transcoding. JPEG (pronounced "jay-peg") is a standardized compression
|
||||
method for full-color and gray-scale images.
|
||||
|
||||
This software implements JPEG baseline, extended-sequential, and progressive
|
||||
compression processes. Provision is made for supporting all variants of these
|
||||
processes, although some uncommon parameter settings aren't implemented yet.
|
||||
For legal reasons, we are not distributing code for the arithmetic-coding
|
||||
variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
|
||||
the hierarchical or lossless processes defined in the standard.
|
||||
We have made no provision for supporting the hierarchical or lossless
|
||||
processes defined in the standard.
|
||||
|
||||
We provide a set of library routines for reading and writing JPEG image files,
|
||||
plus two sample applications "cjpeg" and "djpeg", which use the library to
|
||||
@ -91,10 +77,11 @@ considerable functionality beyond the bare JPEG coding/decoding capability;
|
||||
for example, the color quantization modules are not strictly part of JPEG
|
||||
decoding, but they are essential for output to colormapped file formats or
|
||||
colormapped displays. These extra functions can be compiled out of the
|
||||
library if not required for a particular application. We have also included
|
||||
"jpegtran", a utility for lossless transcoding between different JPEG
|
||||
processes, and "rdjpgcom" and "wrjpgcom", two simple applications for
|
||||
inserting and extracting textual comments in JFIF files.
|
||||
library if not required for a particular application.
|
||||
|
||||
We have also included "jpegtran", a utility for lossless transcoding between
|
||||
different JPEG processes, and "rdjpgcom" and "wrjpgcom", two simple
|
||||
applications for inserting and extracting textual comments in JFIF files.
|
||||
|
||||
The emphasis in designing this software has been on achieving portability and
|
||||
flexibility, while also making it fast enough to be useful. In particular,
|
||||
@ -127,7 +114,7 @@ with respect to this software, its quality, accuracy, merchantability, or
|
||||
fitness for a particular purpose. This software is provided "AS IS", and you,
|
||||
its user, assume the entire risk as to its quality and accuracy.
|
||||
|
||||
This software is copyright (C) 1991-1998, Thomas G. Lane.
|
||||
This software is copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
|
||||
All Rights Reserved except as specified below.
|
||||
|
||||
Permission is hereby granted to use, copy, modify, and distribute this
|
||||
@ -170,17 +157,8 @@ the foregoing paragraphs do.
|
||||
The Unix configuration script "configure" was produced with GNU Autoconf.
|
||||
It is copyright by the Free Software Foundation but is freely distributable.
|
||||
The same holds for its supporting scripts (config.guess, config.sub,
|
||||
ltconfig, ltmain.sh). Another support script, install-sh, is copyright
|
||||
by M.I.T. but is also freely distributable.
|
||||
|
||||
It appears that the arithmetic coding option of the JPEG spec is covered by
|
||||
patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot
|
||||
legally be used without obtaining one or more licenses. For this reason,
|
||||
support for arithmetic coding has been removed from the free JPEG software.
|
||||
(Since arithmetic coding provides only a marginal gain over the unpatented
|
||||
Huffman mode, it is unlikely that very many implementations will support it.)
|
||||
So far as we are aware, there are no patent restrictions on the remaining
|
||||
code.
|
||||
ltmain.sh). Another support script, install-sh, is copyright by X Consortium
|
||||
but is also freely distributable.
|
||||
|
||||
The IJG distribution formerly included code to read and write GIF files.
|
||||
To avoid entanglement with the Unisys LZW patent, GIF reading support has
|
||||
@ -198,7 +176,7 @@ We are required to state that
|
||||
REFERENCES
|
||||
==========
|
||||
|
||||
We highly recommend reading one or more of these references before trying to
|
||||
We recommend reading one or more of these references before trying to
|
||||
understand the innards of the JPEG software.
|
||||
|
||||
The best short technical introduction to the JPEG compression algorithm is
|
||||
@ -207,7 +185,7 @@ The best short technical introduction to the JPEG compression algorithm is
|
||||
(Adjacent articles in that issue discuss MPEG motion picture compression,
|
||||
applications of JPEG, and related topics.) If you don't have the CACM issue
|
||||
handy, a PostScript file containing a revised version of Wallace's article is
|
||||
available at ftp://ftp.uu.net/graphics/jpeg/wallace.ps.gz. The file (actually
|
||||
available at http://www.ijg.org/files/wallace.ps.gz. The file (actually
|
||||
a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
|
||||
omits the sample images that appeared in CACM, but it includes corrections
|
||||
and some added material. Note: the Wallace article is copyright ACM and IEEE,
|
||||
@ -222,82 +200,65 @@ code but don't know much about data compression in general. The book's JPEG
|
||||
sample code is far from industrial-strength, but when you are ready to look
|
||||
at a full implementation, you've got one here...
|
||||
|
||||
The best full description of JPEG is the textbook "JPEG Still Image Data
|
||||
Compression Standard" by William B. Pennebaker and Joan L. Mitchell, published
|
||||
by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1. Price US$59.95, 638 pp.
|
||||
The book includes the complete text of the ISO JPEG standards (DIS 10918-1
|
||||
and draft DIS 10918-2). This is by far the most complete exposition of JPEG
|
||||
in existence, and we highly recommend it.
|
||||
The best currently available description of JPEG is the textbook "JPEG Still
|
||||
Image Data Compression Standard" by William B. Pennebaker and Joan L.
|
||||
Mitchell, published by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1.
|
||||
Price US$59.95, 638 pp. The book includes the complete text of the ISO JPEG
|
||||
standards (DIS 10918-1 and draft DIS 10918-2).
|
||||
Although this is by far the most detailed and comprehensive exposition of
|
||||
JPEG publicly available, we point out that it is still missing an explanation
|
||||
of the most essential properties and algorithms of the underlying DCT
|
||||
technology.
|
||||
If you think that you know about DCT-based JPEG after reading this book,
|
||||
then you are in delusion. The real fundamentals and corresponding potential
|
||||
of DCT-based JPEG are not publicly known so far, and that is the reason for
|
||||
all the mistaken developments taking place in the image coding domain.
|
||||
|
||||
The JPEG standard itself is not available electronically; you must order a
|
||||
paper copy through ISO or ITU. (Unless you feel a need to own a certified
|
||||
official copy, we recommend buying the Pennebaker and Mitchell book instead;
|
||||
it's much cheaper and includes a great deal of useful explanatory material.)
|
||||
In the USA, copies of the standard may be ordered from ANSI Sales at (212)
|
||||
642-4900, or from Global Engineering Documents at (800) 854-7179. (ANSI
|
||||
doesn't take credit card orders, but Global does.) It's not cheap: as of
|
||||
1992, ANSI was charging $95 for Part 1 and $47 for Part 2, plus 7%
|
||||
shipping/handling. The standard is divided into two parts, Part 1 being the
|
||||
actual specification, while Part 2 covers compliance testing methods. Part 1
|
||||
is titled "Digital Compression and Coding of Continuous-tone Still Images,
|
||||
The original JPEG standard is divided into two parts, Part 1 being the actual
|
||||
specification, while Part 2 covers compliance testing methods. Part 1 is
|
||||
titled "Digital Compression and Coding of Continuous-tone Still Images,
|
||||
Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
|
||||
10918-1, ITU-T T.81. Part 2 is titled "Digital Compression and Coding of
|
||||
Continuous-tone Still Images, Part 2: Compliance testing" and has document
|
||||
numbers ISO/IEC IS 10918-2, ITU-T T.83.
|
||||
|
||||
Some extensions to the original JPEG standard are defined in JPEG Part 3,
|
||||
a newer ISO standard numbered ISO/IEC IS 10918-3 and ITU-T T.84. IJG
|
||||
currently does not support any Part 3 extensions.
|
||||
IJG JPEG 8 introduces an implementation of the JPEG SmartScale extension
|
||||
which is specified in a contributed document at ITU and ISO with title "ITU-T
|
||||
JPEG-Plus Proposal for Extending ITU-T T.81 for Advanced Image Coding", April
|
||||
2006, Geneva, Switzerland. The latest version of the document is Revision 3.
|
||||
|
||||
The JPEG standard does not specify all details of an interchangeable file
|
||||
format. For the omitted details we follow the "JFIF" conventions, revision
|
||||
1.02. A copy of the JFIF spec is available from:
|
||||
Literature Department
|
||||
C-Cube Microsystems, Inc.
|
||||
1778 McCarthy Blvd.
|
||||
Milpitas, CA 95035
|
||||
phone (408) 944-6300, fax (408) 944-6314
|
||||
A PostScript version of this document is available by FTP at
|
||||
ftp://ftp.uu.net/graphics/jpeg/jfif.ps.gz. There is also a plain text
|
||||
version at ftp://ftp.uu.net/graphics/jpeg/jfif.txt.gz, but it is missing
|
||||
the figures.
|
||||
1.02. JFIF 1.02 has been adopted as an Ecma International Technical Report
|
||||
and thus received a formal publication status. It is available as a free
|
||||
download in PDF format from
|
||||
http://www.ecma-international.org/publications/techreports/E-TR-098.htm.
|
||||
A PostScript version of the JFIF document is available at
|
||||
http://www.ijg.org/files/jfif.ps.gz. There is also a plain text version at
|
||||
http://www.ijg.org/files/jfif.txt.gz, but it is missing the figures.
|
||||
|
||||
The TIFF 6.0 file format specification can be obtained by FTP from
|
||||
ftp://ftp.sgi.com/graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme
|
||||
found in the TIFF 6.0 spec of 3-June-92 has a number of serious problems.
|
||||
IJG does not recommend use of the TIFF 6.0 design (TIFF Compression tag 6).
|
||||
Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
|
||||
(Compression tag 7). Copies of this Note can be obtained from ftp.sgi.com or
|
||||
from ftp://ftp.uu.net/graphics/jpeg/. It is expected that the next revision
|
||||
(Compression tag 7). Copies of this Note can be obtained from
|
||||
http://www.ijg.org/files/. It is expected that the next revision
|
||||
of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
|
||||
Although IJG's own code does not support TIFF/JPEG, the free libtiff library
|
||||
uses our library to implement TIFF/JPEG per the Note. libtiff is available
|
||||
from ftp://ftp.sgi.com/graphics/tiff/.
|
||||
uses our library to implement TIFF/JPEG per the Note.
|
||||
|
||||
|
||||
ARCHIVE LOCATIONS
|
||||
=================
|
||||
|
||||
The "official" archive site for this software is ftp.uu.net (Internet
|
||||
address 192.48.96.9). The most recent released version can always be found
|
||||
there in directory graphics/jpeg. This particular version will be archived
|
||||
as ftp://ftp.uu.net/graphics/jpeg/jpegsrc.v6b.tar.gz. If you don't have
|
||||
direct Internet access, UUNET's archives are also available via UUCP; contact
|
||||
help@uunet.uu.net for information on retrieving files that way.
|
||||
The "official" archive site for this software is www.ijg.org.
|
||||
The most recent released version can always be found there in
|
||||
directory "files". This particular version will be archived as
|
||||
http://www.ijg.org/files/jpegsrc.v8b.tar.gz, and in Windows-compatible
|
||||
"zip" archive format as http://www.ijg.org/files/jpegsr8b.zip.
|
||||
|
||||
Numerous Internet sites maintain copies of the UUNET files. However, only
|
||||
ftp.uu.net is guaranteed to have the latest official version.
|
||||
|
||||
You can also obtain this software in DOS-compatible "zip" archive format from
|
||||
the SimTel archives (ftp://ftp.simtel.net/pub/simtelnet/msdos/graphics/), or
|
||||
on CompuServe in the Graphics Support forum (GO CIS:GRAPHSUP), library 12
|
||||
"JPEG Tools". Again, these versions may sometimes lag behind the ftp.uu.net
|
||||
release.
|
||||
|
||||
The JPEG FAQ (Frequently Asked Questions) article is a useful source of
|
||||
general information about JPEG. It is updated constantly and therefore is
|
||||
not included in this distribution. The FAQ is posted every two weeks to
|
||||
Usenet newsgroups comp.graphics.misc, news.answers, and other groups.
|
||||
The JPEG FAQ (Frequently Asked Questions) article is a source of some
|
||||
general information about JPEG.
|
||||
It is available on the World Wide Web at http://www.faqs.org/faqs/jpeg-faq/
|
||||
and other news.answers archive sites, including the official news.answers
|
||||
archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/jpeg-faq/.
|
||||
@ -307,79 +268,59 @@ with body
|
||||
send usenet/news.answers/jpeg-faq/part2
|
||||
|
||||
|
||||
RELATED SOFTWARE
|
||||
================
|
||||
ACKNOWLEDGMENTS
|
||||
===============
|
||||
|
||||
Numerous viewing and image manipulation programs now support JPEG. (Quite a
|
||||
few of them use this library to do so.) The JPEG FAQ described above lists
|
||||
some of the more popular free and shareware viewers, and tells where to
|
||||
obtain them on Internet.
|
||||
Thank to Juergen Bruder for providing me with a copy of the common DCT
|
||||
algorithm article, only to find out that I had come to the same result
|
||||
in a more direct and comprehensible way with a more generative approach.
|
||||
|
||||
If you are on a Unix machine, we highly recommend Jef Poskanzer's free
|
||||
PBMPLUS software, which provides many useful operations on PPM-format image
|
||||
files. In particular, it can convert PPM images to and from a wide range of
|
||||
other formats, thus making cjpeg/djpeg considerably more useful. The latest
|
||||
version is distributed by the NetPBM group, and is available from numerous
|
||||
sites, notably ftp://wuarchive.wustl.edu/graphics/graphics/packages/NetPBM/.
|
||||
Unfortunately PBMPLUS/NETPBM is not nearly as portable as the IJG software is;
|
||||
you are likely to have difficulty making it work on any non-Unix machine.
|
||||
Thank to Istvan Sebestyen and Joan L. Mitchell for inviting me to the
|
||||
ITU JPEG (Study Group 16) meeting in Geneva, Switzerland.
|
||||
|
||||
A different free JPEG implementation, written by the PVRG group at Stanford,
|
||||
is available from ftp://havefun.stanford.edu/pub/jpeg/. This program
|
||||
is designed for research and experimentation rather than production use;
|
||||
it is slower, harder to use, and less portable than the IJG code, but it
|
||||
is easier to read and modify. Also, the PVRG code supports lossless JPEG,
|
||||
which we do not. (On the other hand, it doesn't do progressive JPEG.)
|
||||
Thank to Thomas Wiegand and Gary Sullivan for inviting me to the
|
||||
Joint Video Team (MPEG & ITU) meeting in Geneva, Switzerland.
|
||||
|
||||
Thank to John Korejwa and Massimo Ballerini for inviting me to
|
||||
fruitful consultations in Boston, MA and Milan, Italy.
|
||||
|
||||
Thank to Hendrik Elstner, Roland Fassauer, Simone Zuck, Guenther
|
||||
Maier-Gerber, Walter Stoeber, and Fred Schmitz for corresponding
|
||||
business development.
|
||||
|
||||
Thank to Nico Zschach and Dirk Stelling of the technical support team
|
||||
at the Digital Images company in Halle for providing me with extra
|
||||
equipment for configuration tests.
|
||||
|
||||
Thank to Richard F. Lyon (then of Foveon Inc.) for fruitful
|
||||
communication about JPEG configuration in Sigma Photo Pro software.
|
||||
|
||||
Thank to Andrew Finkenstadt for hosting the ijg.org site.
|
||||
|
||||
Last but not least special thank to Thomas G. Lane for the original
|
||||
design and development of this singular software package.
|
||||
|
||||
|
||||
FILE FORMAT WARS
|
||||
================
|
||||
|
||||
Some JPEG programs produce files that are not compatible with our library.
|
||||
The root of the problem is that the ISO JPEG committee failed to specify a
|
||||
concrete file format. Some vendors "filled in the blanks" on their own,
|
||||
creating proprietary formats that no one else could read. (For example, none
|
||||
of the early commercial JPEG implementations for the Macintosh were able to
|
||||
exchange compressed files.)
|
||||
|
||||
The file format we have adopted is called JFIF (see REFERENCES). This format
|
||||
has been agreed to by a number of major commercial JPEG vendors, and it has
|
||||
become the de facto standard. JFIF is a minimal or "low end" representation.
|
||||
We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF
|
||||
Technical Note #2) for "high end" applications that need to record a lot of
|
||||
additional data about an image. TIFF/JPEG is fairly new and not yet widely
|
||||
supported, unfortunately.
|
||||
|
||||
The upcoming JPEG Part 3 standard defines a file format called SPIFF.
|
||||
SPIFF is interoperable with JFIF, in the sense that most JFIF decoders should
|
||||
be able to read the most common variant of SPIFF. SPIFF has some technical
|
||||
advantages over JFIF, but its major claim to fame is simply that it is an
|
||||
official standard rather than an informal one. At this point it is unclear
|
||||
whether SPIFF will supersede JFIF or whether JFIF will remain the de-facto
|
||||
standard. IJG intends to support SPIFF once the standard is frozen, but we
|
||||
have not decided whether it should become our default output format or not.
|
||||
(In any case, our decoder will remain capable of reading JFIF indefinitely.)
|
||||
|
||||
Various proprietary file formats incorporating JPEG compression also exist.
|
||||
We have little or no sympathy for the existence of these formats. Indeed,
|
||||
The ISO JPEG standards committee actually promotes different formats like
|
||||
"JPEG 2000" or "JPEG XR" which are incompatible with original DCT-based
|
||||
JPEG and which are based on faulty technologies. IJG therefore does not
|
||||
and will not support such momentary mistakes (see REFERENCES).
|
||||
We have little or no sympathy for the promotion of these formats. Indeed,
|
||||
one of the original reasons for developing this free software was to help
|
||||
force convergence on common, open format standards for JPEG files. Don't
|
||||
use a proprietary file format!
|
||||
force convergence on common, interoperable format standards for JPEG files.
|
||||
Don't use an incompatible file format!
|
||||
(In any case, our decoder will remain capable of reading existing JPEG
|
||||
image files indefinitely.)
|
||||
|
||||
|
||||
TO DO
|
||||
=====
|
||||
|
||||
The major thrust for v7 will probably be improvement of visual quality.
|
||||
The current method for scaling the quantization tables is known not to be
|
||||
very good at low Q values. We also intend to investigate block boundary
|
||||
smoothing, "poor man's variable quantization", and other means of improving
|
||||
quality-vs-file-size performance without sacrificing compatibility.
|
||||
Version 8 is the first release of a new generation JPEG standard
|
||||
to overcome the limitations of the original JPEG specification.
|
||||
More features are being prepared for coming releases...
|
||||
|
||||
In future versions, we are considering supporting some of the upcoming JPEG
|
||||
Part 3 extensions --- principally, variable quantization and the SPIFF file
|
||||
format.
|
||||
|
||||
As always, speeding things up is of great interest.
|
||||
|
||||
Please send bug reports, offers of help, etc. to jpeg-info@uunet.uu.net.
|
||||
Please send bug reports, offers of help, etc. to jpeg-info@uc.ag.
|
||||
|
@ -1,6 +1,104 @@
|
||||
CHANGE LOG for Independent JPEG Group's JPEG software
|
||||
|
||||
|
||||
Version 8b 16-May-2010
|
||||
-----------------------
|
||||
|
||||
Repair problem in new memory source manager with corrupt JPEG data.
|
||||
Thank to Ted Campbell and Samuel Chun for the report.
|
||||
|
||||
Repair problem in Makefile.am test target.
|
||||
Thank to anonymous user for the report.
|
||||
|
||||
Support MinGW installation with automatic configure.
|
||||
Thank to Volker Grabsch for the suggestion.
|
||||
|
||||
|
||||
Version 8a 28-Feb-2010
|
||||
-----------------------
|
||||
|
||||
Writing tables-only datastreams via jpeg_write_tables works again.
|
||||
|
||||
Support 32-bit BMPs (RGB image with Alpha channel) for read in cjpeg.
|
||||
Thank to Brett Blackham for the suggestion.
|
||||
|
||||
Improve accuracy in floating point IDCT calculation.
|
||||
Thank to Robert Hooke for the hint.
|
||||
|
||||
|
||||
Version 8 10-Jan-2010
|
||||
----------------------
|
||||
|
||||
jpegtran now supports the same -scale option as djpeg for "lossless" resize.
|
||||
An implementation of the JPEG SmartScale extension is required for this
|
||||
feature. A (draft) specification of the JPEG SmartScale extension is
|
||||
available as a contributed document at ITU and ISO. Revision 2 or later
|
||||
of the document is required (latest document version is Revision 3).
|
||||
The SmartScale extension will enable more features beside lossless resize
|
||||
in future implementations, as described in the document (new compression
|
||||
options).
|
||||
|
||||
Add sanity check in BMP reader module to avoid cjpeg crash for empty input
|
||||
image (thank to Isaev Ildar of ISP RAS, Moscow, RU for reporting this error).
|
||||
|
||||
Add data source and destination managers for read from and write to
|
||||
memory buffers. New API functions jpeg_mem_src and jpeg_mem_dest.
|
||||
Thank to Roberto Boni from Italy for the suggestion.
|
||||
|
||||
|
||||
Version 7 27-Jun-2009
|
||||
----------------------
|
||||
|
||||
New scaled DCTs implemented.
|
||||
djpeg now supports scalings N/8 with all N from 1 to 16.
|
||||
cjpeg now supports scalings 8/N with all N from 1 to 16.
|
||||
Scaled DCTs with size larger than 8 are now also used for resolving the
|
||||
common 2x2 chroma subsampling case without additional spatial resampling.
|
||||
Separate spatial resampling for those kind of files is now only necessary
|
||||
for N>8 scaling cases.
|
||||
Furthermore, separate scaled DCT functions are provided for direct resolving
|
||||
of the common asymmetric subsampling cases (2x1 and 1x2) without additional
|
||||
spatial resampling.
|
||||
|
||||
cjpeg -quality option has been extended for support of separate quality
|
||||
settings for luminance and chrominance (or in general, for every provided
|
||||
quantization table slot).
|
||||
New API function jpeg_default_qtables() and q_scale_factor array in library.
|
||||
|
||||
Added -nosmooth option to cjpeg, complementary to djpeg.
|
||||
New variable "do_fancy_downsampling" in library, complement to fancy
|
||||
upsampling. Fancy upsampling now uses direct DCT scaling with sizes
|
||||
larger than 8. The old method is not reversible and has been removed.
|
||||
|
||||
Support arithmetic entropy encoding and decoding.
|
||||
Added files jaricom.c, jcarith.c, jdarith.c.
|
||||
|
||||
Straighten the file structure:
|
||||
Removed files jidctred.c, jcphuff.c, jchuff.h, jdphuff.c, jdhuff.h.
|
||||
|
||||
jpegtran has a new "lossless" cropping feature.
|
||||
|
||||
Implement -perfect option in jpegtran, new API function
|
||||
jtransform_perfect_transform() in transupp. (DP 204_perfect.dpatch)
|
||||
|
||||
Better error messages for jpegtran fopen failure.
|
||||
(DP 203_jpegtran_errmsg.dpatch)
|
||||
|
||||
Fix byte order issue with 16bit PPM/PGM files in rdppm.c/wrppm.c:
|
||||
according to Netpbm, the de facto standard implementation of the PNM formats,
|
||||
the most significant byte is first. (DP 203_rdppm.dpatch)
|
||||
|
||||
Add -raw option to rdjpgcom not to mangle the output.
|
||||
(DP 205_rdjpgcom_raw.dpatch)
|
||||
|
||||
Make rdjpgcom locale aware. (DP 201_rdjpgcom_locale.dpatch)
|
||||
|
||||
Add extern "C" to jpeglib.h.
|
||||
This avoids the need to put extern "C" { ... } around #include "jpeglib.h"
|
||||
in your C++ application. Defining the symbol DONT_USE_EXTERN_C in the
|
||||
configuration prevents this. (DP 202_jpeglib.h_c++.dpatch)
|
||||
|
||||
|
||||
Version 6b 27-Mar-1998
|
||||
-----------------------
|
||||
|
||||
|
@ -103,7 +103,7 @@ should be in the common data structures.
|
||||
|
||||
4. Don't use static variables except for read-only constant tables. Variables
|
||||
that should be private to a module can be placed into private structures (see
|
||||
the system architecture document, structure.doc).
|
||||
the system architecture document, structure.txt).
|
||||
|
||||
5. Source file names should begin with "j" for files that are part of the
|
||||
library proper; source files that are not part of the library, such as cjpeg.c
|
@ -1,6 +1,6 @@
|
||||
IJG JPEG LIBRARY: FILE LIST
|
||||
|
||||
Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
Copyright (C) 1994-2009, Thomas G. Lane, Guido Vollbeding.
|
||||
This file is part of the Independent JPEG Group's software.
|
||||
For conditions of distribution and use, see the accompanying README file.
|
||||
|
||||
@ -28,8 +28,6 @@ jerror.h Declares JPEG library's error and trace message codes.
|
||||
jinclude.h Central include file used by all IJG .c files to reference
|
||||
system include files.
|
||||
jpegint.h JPEG library's internal data structures.
|
||||
jchuff.h Private declarations for Huffman encoder modules.
|
||||
jdhuff.h Private declarations for Huffman decoder modules.
|
||||
jdct.h Private declarations for forward & reverse DCT subsystems.
|
||||
jmemsys.h Private declarations for memory management subsystem.
|
||||
jversion.h Version information.
|
||||
@ -72,10 +70,10 @@ jcdctmgr.c DCT manager (DCT implementation selection & control).
|
||||
jfdctint.c Forward DCT using slow-but-accurate integer method.
|
||||
jfdctfst.c Forward DCT using faster, less accurate integer method.
|
||||
jfdctflt.c Forward DCT using floating-point arithmetic.
|
||||
jchuff.c Huffman entropy coding for sequential JPEG.
|
||||
jcphuff.c Huffman entropy coding for progressive JPEG.
|
||||
jchuff.c Huffman entropy coding.
|
||||
jcarith.c Arithmetic entropy coding.
|
||||
jcmarker.c JPEG marker writing.
|
||||
jdatadst.c Data destination manager for stdio output.
|
||||
jdatadst.c Data destination managers for memory and stdio output.
|
||||
|
||||
Decompression side of the library:
|
||||
|
||||
@ -85,23 +83,24 @@ jdmainct.c Main buffer controller (JPEG decompressor => postprocessor).
|
||||
jdcoefct.c Buffer controller for DCT coefficient buffer.
|
||||
jdpostct.c Postprocessor buffer controller.
|
||||
jdmarker.c JPEG marker reading.
|
||||
jdhuff.c Huffman entropy decoding for sequential JPEG.
|
||||
jdphuff.c Huffman entropy decoding for progressive JPEG.
|
||||
jdhuff.c Huffman entropy decoding.
|
||||
jdarith.c Arithmetic entropy decoding.
|
||||
jddctmgr.c IDCT manager (IDCT implementation selection & control).
|
||||
jidctint.c Inverse DCT using slow-but-accurate integer method.
|
||||
jidctfst.c Inverse DCT using faster, less accurate integer method.
|
||||
jidctflt.c Inverse DCT using floating-point arithmetic.
|
||||
jidctred.c Inverse DCTs with reduced-size outputs.
|
||||
jdsample.c Upsampling.
|
||||
jdcolor.c Color space conversion.
|
||||
jdmerge.c Merged upsampling/color conversion (faster, lower quality).
|
||||
jquant1.c One-pass color quantization using a fixed-spacing colormap.
|
||||
jquant2.c Two-pass color quantization using a custom-generated colormap.
|
||||
Also handles one-pass quantization to an externally given map.
|
||||
jdatasrc.c Data source manager for stdio input.
|
||||
jdatasrc.c Data source managers for memory and stdio input.
|
||||
|
||||
Support files for both compression and decompression:
|
||||
|
||||
jaricom.c Tables for common use in arithmetic entropy encoding and
|
||||
decoding routines.
|
||||
jerror.c Standard error handling routines (application replaceable).
|
||||
jmemmgr.c System-independent (more or less) memory management code.
|
||||
jutils.c Miscellaneous utility routines.
|
||||
@ -118,7 +117,7 @@ jmemdos.c Custom implementation for MS-DOS (16-bit environment only):
|
||||
jmemmac.c Custom implementation for Apple Macintosh.
|
||||
|
||||
Exactly one of the system-dependent modules should be configured into an
|
||||
installed JPEG library (see install.doc for hints about which one to use).
|
||||
installed JPEG library (see install.txt for hints about which one to use).
|
||||
On unusual systems you may find it worthwhile to make a special
|
||||
system-dependent memory manager.
|
||||
|
||||
@ -184,27 +183,33 @@ ADDITIONAL FILES
|
||||
Documentation (see README for a guide to the documentation files):
|
||||
|
||||
README Master documentation file.
|
||||
*.doc Other documentation files.
|
||||
*.txt Other documentation files.
|
||||
*.1 Documentation in Unix man page format.
|
||||
change.log Version-to-version change highlights.
|
||||
example.c Sample code for calling JPEG library.
|
||||
|
||||
Configuration/installation files and programs (see install.doc for more info):
|
||||
Configuration/installation files and programs (see install.txt for more info):
|
||||
|
||||
configure Unix shell script to perform automatic configuration.
|
||||
ltconfig Support scripts for configure (from GNU libtool).
|
||||
ltmain.sh
|
||||
configure.ac Source file for use with Autoconf to generate configure.
|
||||
ltmain.sh Support scripts for configure (from GNU libtool).
|
||||
config.guess
|
||||
config.sub
|
||||
depcomp
|
||||
missing
|
||||
install-sh Install shell script for those Unix systems lacking one.
|
||||
Makefile.in Makefile input for configure.
|
||||
Makefile.am Source file for use with Automake to generate Makefile.in.
|
||||
ckconfig.c Program to generate jconfig.h on non-Unix systems.
|
||||
jconfig.doc Template for making jconfig.h by hand.
|
||||
makefile.* Sample makefiles for particular systems.
|
||||
jconfig.txt Template for making jconfig.h by hand.
|
||||
mak*.* Sample makefiles for particular systems.
|
||||
jconfig.* Sample jconfig.h for particular systems.
|
||||
libjpeg.map Script to generate shared library with versioned symbols.
|
||||
aclocal.m4 M4 macro definitions for use with Autoconf.
|
||||
ansi2knr.c De-ANSIfier for pre-ANSI C compilers (courtesy of
|
||||
L. Peter Deutsch and Aladdin Enterprises).
|
||||
|
||||
Test files (see install.doc for test procedure):
|
||||
Test files (see install.txt for test procedure):
|
||||
|
||||
test*.* Source and comparison files for confidence test.
|
||||
These are binary image files, NOT text files.
|
1096
jpeg/install.txt
Normal file
1096
jpeg/install.txt
Normal file
File diff suppressed because it is too large
Load Diff
153
jpeg/jaricom.c
Normal file
153
jpeg/jaricom.c
Normal file
@ -0,0 +1,153 @@
|
||||
/*
|
||||
* jaricom.c
|
||||
*
|
||||
* Developed 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains probability estimation tables for common use in
|
||||
* arithmetic entropy encoding and decoding routines.
|
||||
*
|
||||
* This data represents Table D.2 in the JPEG spec (ISO/IEC IS 10918-1
|
||||
* and CCITT Recommendation ITU-T T.81) and Table 24 in the JBIG spec
|
||||
* (ISO/IEC IS 11544 and CCITT Recommendation ITU-T T.82).
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
|
||||
/* The following #define specifies the packing of the four components
|
||||
* into the compact INT32 representation.
|
||||
* Note that this formula must match the actual arithmetic encoder
|
||||
* and decoder implementation. The implementation has to be changed
|
||||
* if this formula is changed.
|
||||
* The current organization is leaned on Markus Kuhn's JBIG
|
||||
* implementation (jbig_tab.c).
|
||||
*/
|
||||
|
||||
#define V(i,a,b,c,d) (((INT32)a << 16) | ((INT32)c << 8) | ((INT32)d << 7) | b)
|
||||
|
||||
const INT32 jpeg_aritab[113+1] = {
|
||||
/*
|
||||
* Index, Qe_Value, Next_Index_LPS, Next_Index_MPS, Switch_MPS
|
||||
*/
|
||||
V( 0, 0x5a1d, 1, 1, 1 ),
|
||||
V( 1, 0x2586, 14, 2, 0 ),
|
||||
V( 2, 0x1114, 16, 3, 0 ),
|
||||
V( 3, 0x080b, 18, 4, 0 ),
|
||||
V( 4, 0x03d8, 20, 5, 0 ),
|
||||
V( 5, 0x01da, 23, 6, 0 ),
|
||||
V( 6, 0x00e5, 25, 7, 0 ),
|
||||
V( 7, 0x006f, 28, 8, 0 ),
|
||||
V( 8, 0x0036, 30, 9, 0 ),
|
||||
V( 9, 0x001a, 33, 10, 0 ),
|
||||
V( 10, 0x000d, 35, 11, 0 ),
|
||||
V( 11, 0x0006, 9, 12, 0 ),
|
||||
V( 12, 0x0003, 10, 13, 0 ),
|
||||
V( 13, 0x0001, 12, 13, 0 ),
|
||||
V( 14, 0x5a7f, 15, 15, 1 ),
|
||||
V( 15, 0x3f25, 36, 16, 0 ),
|
||||
V( 16, 0x2cf2, 38, 17, 0 ),
|
||||
V( 17, 0x207c, 39, 18, 0 ),
|
||||
V( 18, 0x17b9, 40, 19, 0 ),
|
||||
V( 19, 0x1182, 42, 20, 0 ),
|
||||
V( 20, 0x0cef, 43, 21, 0 ),
|
||||
V( 21, 0x09a1, 45, 22, 0 ),
|
||||
V( 22, 0x072f, 46, 23, 0 ),
|
||||
V( 23, 0x055c, 48, 24, 0 ),
|
||||
V( 24, 0x0406, 49, 25, 0 ),
|
||||
V( 25, 0x0303, 51, 26, 0 ),
|
||||
V( 26, 0x0240, 52, 27, 0 ),
|
||||
V( 27, 0x01b1, 54, 28, 0 ),
|
||||
V( 28, 0x0144, 56, 29, 0 ),
|
||||
V( 29, 0x00f5, 57, 30, 0 ),
|
||||
V( 30, 0x00b7, 59, 31, 0 ),
|
||||
V( 31, 0x008a, 60, 32, 0 ),
|
||||
V( 32, 0x0068, 62, 33, 0 ),
|
||||
V( 33, 0x004e, 63, 34, 0 ),
|
||||
V( 34, 0x003b, 32, 35, 0 ),
|
||||
V( 35, 0x002c, 33, 9, 0 ),
|
||||
V( 36, 0x5ae1, 37, 37, 1 ),
|
||||
V( 37, 0x484c, 64, 38, 0 ),
|
||||
V( 38, 0x3a0d, 65, 39, 0 ),
|
||||
V( 39, 0x2ef1, 67, 40, 0 ),
|
||||
V( 40, 0x261f, 68, 41, 0 ),
|
||||
V( 41, 0x1f33, 69, 42, 0 ),
|
||||
V( 42, 0x19a8, 70, 43, 0 ),
|
||||
V( 43, 0x1518, 72, 44, 0 ),
|
||||
V( 44, 0x1177, 73, 45, 0 ),
|
||||
V( 45, 0x0e74, 74, 46, 0 ),
|
||||
V( 46, 0x0bfb, 75, 47, 0 ),
|
||||
V( 47, 0x09f8, 77, 48, 0 ),
|
||||
V( 48, 0x0861, 78, 49, 0 ),
|
||||
V( 49, 0x0706, 79, 50, 0 ),
|
||||
V( 50, 0x05cd, 48, 51, 0 ),
|
||||
V( 51, 0x04de, 50, 52, 0 ),
|
||||
V( 52, 0x040f, 50, 53, 0 ),
|
||||
V( 53, 0x0363, 51, 54, 0 ),
|
||||
V( 54, 0x02d4, 52, 55, 0 ),
|
||||
V( 55, 0x025c, 53, 56, 0 ),
|
||||
V( 56, 0x01f8, 54, 57, 0 ),
|
||||
V( 57, 0x01a4, 55, 58, 0 ),
|
||||
V( 58, 0x0160, 56, 59, 0 ),
|
||||
V( 59, 0x0125, 57, 60, 0 ),
|
||||
V( 60, 0x00f6, 58, 61, 0 ),
|
||||
V( 61, 0x00cb, 59, 62, 0 ),
|
||||
V( 62, 0x00ab, 61, 63, 0 ),
|
||||
V( 63, 0x008f, 61, 32, 0 ),
|
||||
V( 64, 0x5b12, 65, 65, 1 ),
|
||||
V( 65, 0x4d04, 80, 66, 0 ),
|
||||
V( 66, 0x412c, 81, 67, 0 ),
|
||||
V( 67, 0x37d8, 82, 68, 0 ),
|
||||
V( 68, 0x2fe8, 83, 69, 0 ),
|
||||
V( 69, 0x293c, 84, 70, 0 ),
|
||||
V( 70, 0x2379, 86, 71, 0 ),
|
||||
V( 71, 0x1edf, 87, 72, 0 ),
|
||||
V( 72, 0x1aa9, 87, 73, 0 ),
|
||||
V( 73, 0x174e, 72, 74, 0 ),
|
||||
V( 74, 0x1424, 72, 75, 0 ),
|
||||
V( 75, 0x119c, 74, 76, 0 ),
|
||||
V( 76, 0x0f6b, 74, 77, 0 ),
|
||||
V( 77, 0x0d51, 75, 78, 0 ),
|
||||
V( 78, 0x0bb6, 77, 79, 0 ),
|
||||
V( 79, 0x0a40, 77, 48, 0 ),
|
||||
V( 80, 0x5832, 80, 81, 1 ),
|
||||
V( 81, 0x4d1c, 88, 82, 0 ),
|
||||
V( 82, 0x438e, 89, 83, 0 ),
|
||||
V( 83, 0x3bdd, 90, 84, 0 ),
|
||||
V( 84, 0x34ee, 91, 85, 0 ),
|
||||
V( 85, 0x2eae, 92, 86, 0 ),
|
||||
V( 86, 0x299a, 93, 87, 0 ),
|
||||
V( 87, 0x2516, 86, 71, 0 ),
|
||||
V( 88, 0x5570, 88, 89, 1 ),
|
||||
V( 89, 0x4ca9, 95, 90, 0 ),
|
||||
V( 90, 0x44d9, 96, 91, 0 ),
|
||||
V( 91, 0x3e22, 97, 92, 0 ),
|
||||
V( 92, 0x3824, 99, 93, 0 ),
|
||||
V( 93, 0x32b4, 99, 94, 0 ),
|
||||
V( 94, 0x2e17, 93, 86, 0 ),
|
||||
V( 95, 0x56a8, 95, 96, 1 ),
|
||||
V( 96, 0x4f46, 101, 97, 0 ),
|
||||
V( 97, 0x47e5, 102, 98, 0 ),
|
||||
V( 98, 0x41cf, 103, 99, 0 ),
|
||||
V( 99, 0x3c3d, 104, 100, 0 ),
|
||||
V( 100, 0x375e, 99, 93, 0 ),
|
||||
V( 101, 0x5231, 105, 102, 0 ),
|
||||
V( 102, 0x4c0f, 106, 103, 0 ),
|
||||
V( 103, 0x4639, 107, 104, 0 ),
|
||||
V( 104, 0x415e, 103, 99, 0 ),
|
||||
V( 105, 0x5627, 105, 106, 1 ),
|
||||
V( 106, 0x50e7, 108, 107, 0 ),
|
||||
V( 107, 0x4b85, 109, 103, 0 ),
|
||||
V( 108, 0x5597, 110, 109, 0 ),
|
||||
V( 109, 0x504f, 111, 107, 0 ),
|
||||
V( 110, 0x5a10, 110, 111, 1 ),
|
||||
V( 111, 0x5522, 112, 109, 0 ),
|
||||
V( 112, 0x59eb, 112, 111, 1 ),
|
||||
/*
|
||||
* This last entry is used for fixed probability estimate of 0.5
|
||||
* as recommended in Section 10.3 Table 5 of ITU-T Rec. T.851.
|
||||
*/
|
||||
V( 113, 0x5a1d, 113, 113, 0 )
|
||||
};
|
@ -2,6 +2,7 @@
|
||||
* jcapimin.c
|
||||
*
|
||||
* Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
* Modified 2003-2010 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -63,14 +64,21 @@ jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
|
||||
|
||||
cinfo->comp_info = NULL;
|
||||
|
||||
for (i = 0; i < NUM_QUANT_TBLS; i++)
|
||||
for (i = 0; i < NUM_QUANT_TBLS; i++) {
|
||||
cinfo->quant_tbl_ptrs[i] = NULL;
|
||||
cinfo->q_scale_factor[i] = 100;
|
||||
}
|
||||
|
||||
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
||||
cinfo->dc_huff_tbl_ptrs[i] = NULL;
|
||||
cinfo->ac_huff_tbl_ptrs[i] = NULL;
|
||||
}
|
||||
|
||||
/* Must do it here for emit_dqt in case jpeg_write_tables is used */
|
||||
cinfo->block_size = DCTSIZE;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
|
||||
cinfo->script_space = NULL;
|
||||
|
||||
cinfo->input_gamma = 1.0; /* in case application forgets */
|
||||
|
934
jpeg/jcarith.c
Normal file
934
jpeg/jcarith.c
Normal file
@ -0,0 +1,934 @@
|
||||
/*
|
||||
* jcarith.c
|
||||
*
|
||||
* Developed 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains portable arithmetic entropy encoding routines for JPEG
|
||||
* (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
|
||||
*
|
||||
* Both sequential and progressive modes are supported in this single module.
|
||||
*
|
||||
* Suspension is not currently supported in this module.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
|
||||
|
||||
/* Expanded entropy encoder object for arithmetic encoding. */
|
||||
|
||||
typedef struct {
|
||||
struct jpeg_entropy_encoder pub; /* public fields */
|
||||
|
||||
INT32 c; /* C register, base of coding interval, layout as in sec. D.1.3 */
|
||||
INT32 a; /* A register, normalized size of coding interval */
|
||||
INT32 sc; /* counter for stacked 0xFF values which might overflow */
|
||||
INT32 zc; /* counter for pending 0x00 output values which might *
|
||||
* be discarded at the end ("Pacman" termination) */
|
||||
int ct; /* bit shift counter, determines when next byte will be written */
|
||||
int buffer; /* buffer for most recent output byte != 0xFF */
|
||||
|
||||
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
|
||||
int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
|
||||
|
||||
unsigned int restarts_to_go; /* MCUs left in this restart interval */
|
||||
int next_restart_num; /* next restart number to write (0-7) */
|
||||
|
||||
/* Pointers to statistics areas (these workspaces have image lifespan) */
|
||||
unsigned char * dc_stats[NUM_ARITH_TBLS];
|
||||
unsigned char * ac_stats[NUM_ARITH_TBLS];
|
||||
|
||||
/* Statistics bin for coding with fixed probability 0.5 */
|
||||
unsigned char fixed_bin[4];
|
||||
} arith_entropy_encoder;
|
||||
|
||||
typedef arith_entropy_encoder * arith_entropy_ptr;
|
||||
|
||||
/* The following two definitions specify the allocation chunk size
|
||||
* for the statistics area.
|
||||
* According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
|
||||
* 49 statistics bins for DC, and 245 statistics bins for AC coding.
|
||||
*
|
||||
* We use a compact representation with 1 byte per statistics bin,
|
||||
* thus the numbers directly represent byte sizes.
|
||||
* This 1 byte per statistics bin contains the meaning of the MPS
|
||||
* (more probable symbol) in the highest bit (mask 0x80), and the
|
||||
* index into the probability estimation state machine table
|
||||
* in the lower bits (mask 0x7F).
|
||||
*/
|
||||
|
||||
#define DC_STAT_BINS 64
|
||||
#define AC_STAT_BINS 256
|
||||
|
||||
/* NOTE: Uncomment the following #define if you want to use the
|
||||
* given formula for calculating the AC conditioning parameter Kx
|
||||
* for spectral selection progressive coding in section G.1.3.2
|
||||
* of the spec (Kx = Kmin + SRL (8 + Se - Kmin) 4).
|
||||
* Although the spec and P&M authors claim that this "has proven
|
||||
* to give good results for 8 bit precision samples", I'm not
|
||||
* convinced yet that this is really beneficial.
|
||||
* Early tests gave only very marginal compression enhancements
|
||||
* (a few - around 5 or so - bytes even for very large files),
|
||||
* which would turn out rather negative if we'd suppress the
|
||||
* DAC (Define Arithmetic Conditioning) marker segments for
|
||||
* the default parameters in the future.
|
||||
* Note that currently the marker writing module emits 12-byte
|
||||
* DAC segments for a full-component scan in a color image.
|
||||
* This is not worth worrying about IMHO. However, since the
|
||||
* spec defines the default values to be used if the tables
|
||||
* are omitted (unlike Huffman tables, which are required
|
||||
* anyway), one might optimize this behaviour in the future,
|
||||
* and then it would be disadvantageous to use custom tables if
|
||||
* they don't provide sufficient gain to exceed the DAC size.
|
||||
*
|
||||
* On the other hand, I'd consider it as a reasonable result
|
||||
* that the conditioning has no significant influence on the
|
||||
* compression performance. This means that the basic
|
||||
* statistical model is already rather stable.
|
||||
*
|
||||
* Thus, at the moment, we use the default conditioning values
|
||||
* anyway, and do not use the custom formula.
|
||||
*
|
||||
#define CALCULATE_SPECTRAL_CONDITIONING
|
||||
*/
|
||||
|
||||
/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
|
||||
* We assume that int right shift is unsigned if INT32 right shift is,
|
||||
* which should be safe.
|
||||
*/
|
||||
|
||||
#ifdef RIGHT_SHIFT_IS_UNSIGNED
|
||||
#define ISHIFT_TEMPS int ishift_temp;
|
||||
#define IRIGHT_SHIFT(x,shft) \
|
||||
((ishift_temp = (x)) < 0 ? \
|
||||
(ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
|
||||
(ishift_temp >> (shft)))
|
||||
#else
|
||||
#define ISHIFT_TEMPS
|
||||
#define IRIGHT_SHIFT(x,shft) ((x) >> (shft))
|
||||
#endif
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
emit_byte (int val, j_compress_ptr cinfo)
|
||||
/* Write next output byte; we do not support suspension in this module. */
|
||||
{
|
||||
struct jpeg_destination_mgr * dest = cinfo->dest;
|
||||
|
||||
*dest->next_output_byte++ = (JOCTET) val;
|
||||
if (--dest->free_in_buffer == 0)
|
||||
if (! (*dest->empty_output_buffer) (cinfo))
|
||||
ERREXIT(cinfo, JERR_CANT_SUSPEND);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Finish up at the end of an arithmetic-compressed scan.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
finish_pass (j_compress_ptr cinfo)
|
||||
{
|
||||
arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
|
||||
INT32 temp;
|
||||
|
||||
/* Section D.1.8: Termination of encoding */
|
||||
|
||||
/* Find the e->c in the coding interval with the largest
|
||||
* number of trailing zero bits */
|
||||
if ((temp = (e->a - 1 + e->c) & 0xFFFF0000L) < e->c)
|
||||
e->c = temp + 0x8000L;
|
||||
else
|
||||
e->c = temp;
|
||||
/* Send remaining bytes to output */
|
||||
e->c <<= e->ct;
|
||||
if (e->c & 0xF8000000L) {
|
||||
/* One final overflow has to be handled */
|
||||
if (e->buffer >= 0) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
emit_byte(e->buffer + 1, cinfo);
|
||||
if (e->buffer + 1 == 0xFF)
|
||||
emit_byte(0x00, cinfo);
|
||||
}
|
||||
e->zc += e->sc; /* carry-over converts stacked 0xFF bytes to 0x00 */
|
||||
e->sc = 0;
|
||||
} else {
|
||||
if (e->buffer == 0)
|
||||
++e->zc;
|
||||
else if (e->buffer >= 0) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
emit_byte(e->buffer, cinfo);
|
||||
}
|
||||
if (e->sc) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
do {
|
||||
emit_byte(0xFF, cinfo);
|
||||
emit_byte(0x00, cinfo);
|
||||
} while (--e->sc);
|
||||
}
|
||||
}
|
||||
/* Output final bytes only if they are not 0x00 */
|
||||
if (e->c & 0x7FFF800L) {
|
||||
if (e->zc) /* output final pending zero bytes */
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
emit_byte((e->c >> 19) & 0xFF, cinfo);
|
||||
if (((e->c >> 19) & 0xFF) == 0xFF)
|
||||
emit_byte(0x00, cinfo);
|
||||
if (e->c & 0x7F800L) {
|
||||
emit_byte((e->c >> 11) & 0xFF, cinfo);
|
||||
if (((e->c >> 11) & 0xFF) == 0xFF)
|
||||
emit_byte(0x00, cinfo);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* The core arithmetic encoding routine (common in JPEG and JBIG).
|
||||
* This needs to go as fast as possible.
|
||||
* Machine-dependent optimization facilities
|
||||
* are not utilized in this portable implementation.
|
||||
* However, this code should be fairly efficient and
|
||||
* may be a good base for further optimizations anyway.
|
||||
*
|
||||
* Parameter 'val' to be encoded may be 0 or 1 (binary decision).
|
||||
*
|
||||
* Note: I've added full "Pacman" termination support to the
|
||||
* byte output routines, which is equivalent to the optional
|
||||
* Discard_final_zeros procedure (Figure D.15) in the spec.
|
||||
* Thus, we always produce the shortest possible output
|
||||
* stream compliant to the spec (no trailing zero bytes,
|
||||
* except for FF stuffing).
|
||||
*
|
||||
* I've also introduced a new scheme for accessing
|
||||
* the probability estimation state machine table,
|
||||
* derived from Markus Kuhn's JBIG implementation.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
|
||||
{
|
||||
register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
|
||||
register unsigned char nl, nm;
|
||||
register INT32 qe, temp;
|
||||
register int sv;
|
||||
|
||||
/* Fetch values from our compact representation of Table D.2:
|
||||
* Qe values and probability estimation state machine
|
||||
*/
|
||||
sv = *st;
|
||||
qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
|
||||
nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
|
||||
nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
|
||||
|
||||
/* Encode & estimation procedures per sections D.1.4 & D.1.5 */
|
||||
e->a -= qe;
|
||||
if (val != (sv >> 7)) {
|
||||
/* Encode the less probable symbol */
|
||||
if (e->a >= qe) {
|
||||
/* If the interval size (qe) for the less probable symbol (LPS)
|
||||
* is larger than the interval size for the MPS, then exchange
|
||||
* the two symbols for coding efficiency, otherwise code the LPS
|
||||
* as usual: */
|
||||
e->c += e->a;
|
||||
e->a = qe;
|
||||
}
|
||||
*st = (sv & 0x80) ^ nl; /* Estimate_after_LPS */
|
||||
} else {
|
||||
/* Encode the more probable symbol */
|
||||
if (e->a >= 0x8000L)
|
||||
return; /* A >= 0x8000 -> ready, no renormalization required */
|
||||
if (e->a < qe) {
|
||||
/* If the interval size (qe) for the less probable symbol (LPS)
|
||||
* is larger than the interval size for the MPS, then exchange
|
||||
* the two symbols for coding efficiency: */
|
||||
e->c += e->a;
|
||||
e->a = qe;
|
||||
}
|
||||
*st = (sv & 0x80) ^ nm; /* Estimate_after_MPS */
|
||||
}
|
||||
|
||||
/* Renormalization & data output per section D.1.6 */
|
||||
do {
|
||||
e->a <<= 1;
|
||||
e->c <<= 1;
|
||||
if (--e->ct == 0) {
|
||||
/* Another byte is ready for output */
|
||||
temp = e->c >> 19;
|
||||
if (temp > 0xFF) {
|
||||
/* Handle overflow over all stacked 0xFF bytes */
|
||||
if (e->buffer >= 0) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
emit_byte(e->buffer + 1, cinfo);
|
||||
if (e->buffer + 1 == 0xFF)
|
||||
emit_byte(0x00, cinfo);
|
||||
}
|
||||
e->zc += e->sc; /* carry-over converts stacked 0xFF bytes to 0x00 */
|
||||
e->sc = 0;
|
||||
/* Note: The 3 spacer bits in the C register guarantee
|
||||
* that the new buffer byte can't be 0xFF here
|
||||
* (see page 160 in the P&M JPEG book). */
|
||||
e->buffer = temp & 0xFF; /* new output byte, might overflow later */
|
||||
} else if (temp == 0xFF) {
|
||||
++e->sc; /* stack 0xFF byte (which might overflow later) */
|
||||
} else {
|
||||
/* Output all stacked 0xFF bytes, they will not overflow any more */
|
||||
if (e->buffer == 0)
|
||||
++e->zc;
|
||||
else if (e->buffer >= 0) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
emit_byte(e->buffer, cinfo);
|
||||
}
|
||||
if (e->sc) {
|
||||
if (e->zc)
|
||||
do emit_byte(0x00, cinfo);
|
||||
while (--e->zc);
|
||||
do {
|
||||
emit_byte(0xFF, cinfo);
|
||||
emit_byte(0x00, cinfo);
|
||||
} while (--e->sc);
|
||||
}
|
||||
e->buffer = temp & 0xFF; /* new output byte (can still overflow) */
|
||||
}
|
||||
e->c &= 0x7FFFFL;
|
||||
e->ct += 8;
|
||||
}
|
||||
} while (e->a < 0x8000L);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Emit a restart marker & resynchronize predictions.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
emit_restart (j_compress_ptr cinfo, int restart_num)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
int ci;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
finish_pass(cinfo);
|
||||
|
||||
emit_byte(0xFF, cinfo);
|
||||
emit_byte(JPEG_RST0 + restart_num, cinfo);
|
||||
|
||||
/* Re-initialize statistics areas */
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
/* DC needs no table for refinement scan */
|
||||
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
|
||||
MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
|
||||
/* Reset DC predictions to 0 */
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
entropy->dc_context[ci] = 0;
|
||||
}
|
||||
/* AC needs no table when not present */
|
||||
if (cinfo->Se) {
|
||||
MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
|
||||
}
|
||||
}
|
||||
|
||||
/* Reset arithmetic encoding variables */
|
||||
entropy->c = 0;
|
||||
entropy->a = 0x10000L;
|
||||
entropy->sc = 0;
|
||||
entropy->zc = 0;
|
||||
entropy->ct = 11;
|
||||
entropy->buffer = -1; /* empty */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for DC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int blkn, ci, tbl;
|
||||
int v, v2, m;
|
||||
ISHIFT_TEMPS
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
emit_restart(cinfo, entropy->next_restart_num);
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
/* Encode the MCU data blocks */
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
|
||||
|
||||
/* Compute the DC value after the required point transform by Al.
|
||||
* This is simply an arithmetic right shift.
|
||||
*/
|
||||
m = IRIGHT_SHIFT((int) ((*block)[0]), cinfo->Al);
|
||||
|
||||
/* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
|
||||
|
||||
/* Table F.4: Point to statistics bin S0 for DC coefficient coding */
|
||||
st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
|
||||
|
||||
/* Figure F.4: Encode_DC_DIFF */
|
||||
if ((v = m - entropy->last_dc_val[ci]) == 0) {
|
||||
arith_encode(cinfo, st, 0);
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
} else {
|
||||
entropy->last_dc_val[ci] = m;
|
||||
arith_encode(cinfo, st, 1);
|
||||
/* Figure F.6: Encoding nonzero value v */
|
||||
/* Figure F.7: Encoding the sign of v */
|
||||
if (v > 0) {
|
||||
arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
|
||||
st += 2; /* Table F.4: SP = S0 + 2 */
|
||||
entropy->dc_context[ci] = 4; /* small positive diff category */
|
||||
} else {
|
||||
v = -v;
|
||||
arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
|
||||
st += 3; /* Table F.4: SN = S0 + 3 */
|
||||
entropy->dc_context[ci] = 8; /* small negative diff category */
|
||||
}
|
||||
/* Figure F.8: Encoding the magnitude category of v */
|
||||
m = 0;
|
||||
if (v -= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m = 1;
|
||||
v2 = v;
|
||||
st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
|
||||
while (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st, 0);
|
||||
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
|
||||
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
|
||||
entropy->dc_context[ci] += 8; /* large diff category */
|
||||
/* Figure F.9: Encoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
arith_encode(cinfo, st, (m & v) ? 1 : 0);
|
||||
}
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for AC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int tbl, k, ke;
|
||||
int v, v2, m;
|
||||
const int * natural_order;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
emit_restart(cinfo, entropy->next_restart_num);
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* Encode the MCU data block */
|
||||
block = MCU_data[0];
|
||||
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
|
||||
|
||||
/* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
|
||||
|
||||
/* Establish EOB (end-of-block) index */
|
||||
for (ke = cinfo->Se; ke > 0; ke--)
|
||||
/* We must apply the point transform by Al. For AC coefficients this
|
||||
* is an integer division with rounding towards 0. To do this portably
|
||||
* in C, we shift after obtaining the absolute value.
|
||||
*/
|
||||
if ((v = (*block)[natural_order[ke]]) >= 0) {
|
||||
if (v >>= cinfo->Al) break;
|
||||
} else {
|
||||
v = -v;
|
||||
if (v >>= cinfo->Al) break;
|
||||
}
|
||||
|
||||
/* Figure F.5: Encode_AC_Coefficients */
|
||||
for (k = cinfo->Ss; k <= ke; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
arith_encode(cinfo, st, 0); /* EOB decision */
|
||||
for (;;) {
|
||||
if ((v = (*block)[natural_order[k]]) >= 0) {
|
||||
if (v >>= cinfo->Al) {
|
||||
arith_encode(cinfo, st + 1, 1);
|
||||
arith_encode(cinfo, entropy->fixed_bin, 0);
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
v = -v;
|
||||
if (v >>= cinfo->Al) {
|
||||
arith_encode(cinfo, st + 1, 1);
|
||||
arith_encode(cinfo, entropy->fixed_bin, 1);
|
||||
break;
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st + 1, 0); st += 3; k++;
|
||||
}
|
||||
st += 2;
|
||||
/* Figure F.8: Encoding the magnitude category of v */
|
||||
m = 0;
|
||||
if (v -= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m = 1;
|
||||
v2 = v;
|
||||
if (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st = entropy->ac_stats[tbl] +
|
||||
(k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
|
||||
while (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st, 0);
|
||||
/* Figure F.9: Encoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
arith_encode(cinfo, st, (m & v) ? 1 : 0);
|
||||
}
|
||||
/* Encode EOB decision only if k <= cinfo->Se */
|
||||
if (k <= cinfo->Se) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
arith_encode(cinfo, st, 1);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for DC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
unsigned char *st;
|
||||
int Al, blkn;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
emit_restart(cinfo, entropy->next_restart_num);
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
st = entropy->fixed_bin; /* use fixed probability estimation */
|
||||
Al = cinfo->Al;
|
||||
|
||||
/* Encode the MCU data blocks */
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
/* We simply emit the Al'th bit of the DC coefficient value. */
|
||||
arith_encode(cinfo, st, (MCU_data[blkn][0][0] >> Al) & 1);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for AC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int tbl, k, ke, kex;
|
||||
int v;
|
||||
const int * natural_order;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
emit_restart(cinfo, entropy->next_restart_num);
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* Encode the MCU data block */
|
||||
block = MCU_data[0];
|
||||
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
|
||||
|
||||
/* Section G.1.3.3: Encoding of AC coefficients */
|
||||
|
||||
/* Establish EOB (end-of-block) index */
|
||||
for (ke = cinfo->Se; ke > 0; ke--)
|
||||
/* We must apply the point transform by Al. For AC coefficients this
|
||||
* is an integer division with rounding towards 0. To do this portably
|
||||
* in C, we shift after obtaining the absolute value.
|
||||
*/
|
||||
if ((v = (*block)[natural_order[ke]]) >= 0) {
|
||||
if (v >>= cinfo->Al) break;
|
||||
} else {
|
||||
v = -v;
|
||||
if (v >>= cinfo->Al) break;
|
||||
}
|
||||
|
||||
/* Establish EOBx (previous stage end-of-block) index */
|
||||
for (kex = ke; kex > 0; kex--)
|
||||
if ((v = (*block)[natural_order[kex]]) >= 0) {
|
||||
if (v >>= cinfo->Ah) break;
|
||||
} else {
|
||||
v = -v;
|
||||
if (v >>= cinfo->Ah) break;
|
||||
}
|
||||
|
||||
/* Figure G.10: Encode_AC_Coefficients_SA */
|
||||
for (k = cinfo->Ss; k <= ke; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
if (k > kex)
|
||||
arith_encode(cinfo, st, 0); /* EOB decision */
|
||||
for (;;) {
|
||||
if ((v = (*block)[natural_order[k]]) >= 0) {
|
||||
if (v >>= cinfo->Al) {
|
||||
if (v >> 1) /* previously nonzero coef */
|
||||
arith_encode(cinfo, st + 2, (v & 1));
|
||||
else { /* newly nonzero coef */
|
||||
arith_encode(cinfo, st + 1, 1);
|
||||
arith_encode(cinfo, entropy->fixed_bin, 0);
|
||||
}
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
v = -v;
|
||||
if (v >>= cinfo->Al) {
|
||||
if (v >> 1) /* previously nonzero coef */
|
||||
arith_encode(cinfo, st + 2, (v & 1));
|
||||
else { /* newly nonzero coef */
|
||||
arith_encode(cinfo, st + 1, 1);
|
||||
arith_encode(cinfo, entropy->fixed_bin, 1);
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st + 1, 0); st += 3; k++;
|
||||
}
|
||||
}
|
||||
/* Encode EOB decision only if k <= cinfo->Se */
|
||||
if (k <= cinfo->Se) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
arith_encode(cinfo, st, 1);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Encode and output one MCU's worth of arithmetic-compressed coefficients.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
jpeg_component_info * compptr;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int blkn, ci, tbl, k, ke;
|
||||
int v, v2, m;
|
||||
const int * natural_order;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
emit_restart(cinfo, entropy->next_restart_num);
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* Encode the MCU data blocks */
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
|
||||
/* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
|
||||
|
||||
tbl = compptr->dc_tbl_no;
|
||||
|
||||
/* Table F.4: Point to statistics bin S0 for DC coefficient coding */
|
||||
st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
|
||||
|
||||
/* Figure F.4: Encode_DC_DIFF */
|
||||
if ((v = (*block)[0] - entropy->last_dc_val[ci]) == 0) {
|
||||
arith_encode(cinfo, st, 0);
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
} else {
|
||||
entropy->last_dc_val[ci] = (*block)[0];
|
||||
arith_encode(cinfo, st, 1);
|
||||
/* Figure F.6: Encoding nonzero value v */
|
||||
/* Figure F.7: Encoding the sign of v */
|
||||
if (v > 0) {
|
||||
arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
|
||||
st += 2; /* Table F.4: SP = S0 + 2 */
|
||||
entropy->dc_context[ci] = 4; /* small positive diff category */
|
||||
} else {
|
||||
v = -v;
|
||||
arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
|
||||
st += 3; /* Table F.4: SN = S0 + 3 */
|
||||
entropy->dc_context[ci] = 8; /* small negative diff category */
|
||||
}
|
||||
/* Figure F.8: Encoding the magnitude category of v */
|
||||
m = 0;
|
||||
if (v -= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m = 1;
|
||||
v2 = v;
|
||||
st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
|
||||
while (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st, 0);
|
||||
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
|
||||
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
|
||||
entropy->dc_context[ci] += 8; /* large diff category */
|
||||
/* Figure F.9: Encoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
arith_encode(cinfo, st, (m & v) ? 1 : 0);
|
||||
}
|
||||
|
||||
/* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
|
||||
|
||||
tbl = compptr->ac_tbl_no;
|
||||
|
||||
/* Establish EOB (end-of-block) index */
|
||||
for (ke = cinfo->lim_Se; ke > 0; ke--)
|
||||
if ((*block)[natural_order[ke]]) break;
|
||||
|
||||
/* Figure F.5: Encode_AC_Coefficients */
|
||||
for (k = 1; k <= ke; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
arith_encode(cinfo, st, 0); /* EOB decision */
|
||||
while ((v = (*block)[natural_order[k]]) == 0) {
|
||||
arith_encode(cinfo, st + 1, 0); st += 3; k++;
|
||||
}
|
||||
arith_encode(cinfo, st + 1, 1);
|
||||
/* Figure F.6: Encoding nonzero value v */
|
||||
/* Figure F.7: Encoding the sign of v */
|
||||
if (v > 0) {
|
||||
arith_encode(cinfo, entropy->fixed_bin, 0);
|
||||
} else {
|
||||
v = -v;
|
||||
arith_encode(cinfo, entropy->fixed_bin, 1);
|
||||
}
|
||||
st += 2;
|
||||
/* Figure F.8: Encoding the magnitude category of v */
|
||||
m = 0;
|
||||
if (v -= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m = 1;
|
||||
v2 = v;
|
||||
if (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st = entropy->ac_stats[tbl] +
|
||||
(k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
|
||||
while (v2 >>= 1) {
|
||||
arith_encode(cinfo, st, 1);
|
||||
m <<= 1;
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
arith_encode(cinfo, st, 0);
|
||||
/* Figure F.9: Encoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
arith_encode(cinfo, st, (m & v) ? 1 : 0);
|
||||
}
|
||||
/* Encode EOB decision only if k <= cinfo->lim_Se */
|
||||
if (k <= cinfo->lim_Se) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
arith_encode(cinfo, st, 1);
|
||||
}
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for an arithmetic-compressed scan.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass (j_compress_ptr cinfo, boolean gather_statistics)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
int ci, tbl;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
if (gather_statistics)
|
||||
/* Make sure to avoid that in the master control logic!
|
||||
* We are fully adaptive here and need no extra
|
||||
* statistics gathering pass!
|
||||
*/
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
|
||||
/* We assume jcmaster.c already validated the progressive scan parameters. */
|
||||
|
||||
/* Select execution routines */
|
||||
if (cinfo->progressive_mode) {
|
||||
if (cinfo->Ah == 0) {
|
||||
if (cinfo->Ss == 0)
|
||||
entropy->pub.encode_mcu = encode_mcu_DC_first;
|
||||
else
|
||||
entropy->pub.encode_mcu = encode_mcu_AC_first;
|
||||
} else {
|
||||
if (cinfo->Ss == 0)
|
||||
entropy->pub.encode_mcu = encode_mcu_DC_refine;
|
||||
else
|
||||
entropy->pub.encode_mcu = encode_mcu_AC_refine;
|
||||
}
|
||||
} else
|
||||
entropy->pub.encode_mcu = encode_mcu;
|
||||
|
||||
/* Allocate & initialize requested statistics areas */
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
/* DC needs no table for refinement scan */
|
||||
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
|
||||
tbl = compptr->dc_tbl_no;
|
||||
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
|
||||
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
|
||||
if (entropy->dc_stats[tbl] == NULL)
|
||||
entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
|
||||
MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
|
||||
/* Initialize DC predictions to 0 */
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
entropy->dc_context[ci] = 0;
|
||||
}
|
||||
/* AC needs no table when not present */
|
||||
if (cinfo->Se) {
|
||||
tbl = compptr->ac_tbl_no;
|
||||
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
|
||||
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
|
||||
if (entropy->ac_stats[tbl] == NULL)
|
||||
entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
|
||||
MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
|
||||
#ifdef CALCULATE_SPECTRAL_CONDITIONING
|
||||
if (cinfo->progressive_mode)
|
||||
/* Section G.1.3.2: Set appropriate arithmetic conditioning value Kx */
|
||||
cinfo->arith_ac_K[tbl] = cinfo->Ss + ((8 + cinfo->Se - cinfo->Ss) >> 4);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
/* Initialize arithmetic encoding variables */
|
||||
entropy->c = 0;
|
||||
entropy->a = 0x10000L;
|
||||
entropy->sc = 0;
|
||||
entropy->zc = 0;
|
||||
entropy->ct = 11;
|
||||
entropy->buffer = -1; /* empty */
|
||||
|
||||
/* Initialize restart stuff */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num = 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Module initialization routine for arithmetic entropy encoding.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jinit_arith_encoder (j_compress_ptr cinfo)
|
||||
{
|
||||
arith_entropy_ptr entropy;
|
||||
int i;
|
||||
|
||||
entropy = (arith_entropy_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(arith_entropy_encoder));
|
||||
cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
|
||||
entropy->pub.start_pass = start_pass;
|
||||
entropy->pub.finish_pass = finish_pass;
|
||||
|
||||
/* Mark tables unallocated */
|
||||
for (i = 0; i < NUM_ARITH_TBLS; i++) {
|
||||
entropy->dc_stats[i] = NULL;
|
||||
entropy->ac_stats[i] = NULL;
|
||||
}
|
||||
|
||||
/* Initialize index for fixed probability estimation */
|
||||
entropy->fixed_bin[0] = 113;
|
||||
}
|
@ -149,6 +149,7 @@ compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
|
||||
int blkn, bi, ci, yindex, yoffset, blockcnt;
|
||||
JDIMENSION ypos, xpos;
|
||||
jpeg_component_info *compptr;
|
||||
forward_DCT_ptr forward_DCT;
|
||||
|
||||
/* Loop to write as much as one whole iMCU row */
|
||||
for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
|
||||
@ -167,17 +168,19 @@ compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
|
||||
blkn = 0;
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
forward_DCT = cinfo->fdct->forward_DCT[compptr->component_index];
|
||||
blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
|
||||
: compptr->last_col_width;
|
||||
xpos = MCU_col_num * compptr->MCU_sample_width;
|
||||
ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */
|
||||
ypos = yoffset * compptr->DCT_v_scaled_size;
|
||||
/* ypos == (yoffset+yindex) * DCTSIZE */
|
||||
for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
|
||||
if (coef->iMCU_row_num < last_iMCU_row ||
|
||||
yoffset+yindex < compptr->last_row_height) {
|
||||
(*cinfo->fdct->forward_DCT) (cinfo, compptr,
|
||||
input_buf[compptr->component_index],
|
||||
coef->MCU_buffer[blkn],
|
||||
ypos, xpos, (JDIMENSION) blockcnt);
|
||||
(*forward_DCT) (cinfo, compptr,
|
||||
input_buf[compptr->component_index],
|
||||
coef->MCU_buffer[blkn],
|
||||
ypos, xpos, (JDIMENSION) blockcnt);
|
||||
if (blockcnt < compptr->MCU_width) {
|
||||
/* Create some dummy blocks at the right edge of the image. */
|
||||
jzero_far((void FAR *) coef->MCU_buffer[blkn + blockcnt],
|
||||
@ -195,7 +198,7 @@ compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
|
||||
}
|
||||
}
|
||||
blkn += compptr->MCU_width;
|
||||
ypos += DCTSIZE;
|
||||
ypos += compptr->DCT_v_scaled_size;
|
||||
}
|
||||
}
|
||||
/* Try to write the MCU. In event of a suspension failure, we will
|
||||
@ -252,6 +255,7 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
|
||||
jpeg_component_info *compptr;
|
||||
JBLOCKARRAY buffer;
|
||||
JBLOCKROW thisblockrow, lastblockrow;
|
||||
forward_DCT_ptr forward_DCT;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
@ -274,15 +278,15 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
|
||||
ndummy = (int) (blocks_across % h_samp_factor);
|
||||
if (ndummy > 0)
|
||||
ndummy = h_samp_factor - ndummy;
|
||||
forward_DCT = cinfo->fdct->forward_DCT[ci];
|
||||
/* Perform DCT for all non-dummy blocks in this iMCU row. Each call
|
||||
* on forward_DCT processes a complete horizontal row of DCT blocks.
|
||||
*/
|
||||
for (block_row = 0; block_row < block_rows; block_row++) {
|
||||
thisblockrow = buffer[block_row];
|
||||
(*cinfo->fdct->forward_DCT) (cinfo, compptr,
|
||||
input_buf[ci], thisblockrow,
|
||||
(JDIMENSION) (block_row * DCTSIZE),
|
||||
(JDIMENSION) 0, blocks_across);
|
||||
(*forward_DCT) (cinfo, compptr, input_buf[ci], thisblockrow,
|
||||
(JDIMENSION) (block_row * compptr->DCT_v_scaled_size),
|
||||
(JDIMENSION) 0, blocks_across);
|
||||
if (ndummy > 0) {
|
||||
/* Create dummy blocks at the right edge of the image. */
|
||||
thisblockrow += blocks_across; /* => first dummy block */
|
||||
|
511
jpeg/jcdctmgr.c
511
jpeg/jcdctmgr.c
@ -23,7 +23,7 @@ typedef struct {
|
||||
struct jpeg_forward_dct pub; /* public fields */
|
||||
|
||||
/* Pointer to the DCT routine actually in use */
|
||||
forward_DCT_method_ptr do_dct;
|
||||
forward_DCT_method_ptr do_dct[MAX_COMPONENTS];
|
||||
|
||||
/* The actual post-DCT divisors --- not identical to the quant table
|
||||
* entries, because of scaling (especially for an unnormalized DCT).
|
||||
@ -33,7 +33,7 @@ typedef struct {
|
||||
|
||||
#ifdef DCT_FLOAT_SUPPORTED
|
||||
/* Same as above for the floating-point case. */
|
||||
float_DCT_method_ptr do_float_dct;
|
||||
float_DCT_method_ptr do_float_dct[MAX_COMPONENTS];
|
||||
FAST_FLOAT * float_divisors[NUM_QUANT_TBLS];
|
||||
#endif
|
||||
} my_fdct_controller;
|
||||
@ -41,131 +41,16 @@ typedef struct {
|
||||
typedef my_fdct_controller * my_fdct_ptr;
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for a processing pass.
|
||||
* Verify that all referenced Q-tables are present, and set up
|
||||
* the divisor table for each one.
|
||||
* In the current implementation, DCT of all components is done during
|
||||
* the first pass, even if only some components will be output in the
|
||||
* first scan. Hence all components should be examined here.
|
||||
/* The current scaled-DCT routines require ISLOW-style divisor tables,
|
||||
* so be sure to compile that code if either ISLOW or SCALING is requested.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass_fdctmgr (j_compress_ptr cinfo)
|
||||
{
|
||||
my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
|
||||
int ci, qtblno, i;
|
||||
jpeg_component_info *compptr;
|
||||
JQUANT_TBL * qtbl;
|
||||
DCTELEM * dtbl;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
qtblno = compptr->quant_tbl_no;
|
||||
/* Make sure specified quantization table is present */
|
||||
if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
|
||||
cinfo->quant_tbl_ptrs[qtblno] == NULL)
|
||||
ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
|
||||
qtbl = cinfo->quant_tbl_ptrs[qtblno];
|
||||
/* Compute divisors for this quant table */
|
||||
/* We may do this more than once for same table, but it's not a big deal */
|
||||
switch (cinfo->dct_method) {
|
||||
#ifdef DCT_ISLOW_SUPPORTED
|
||||
case JDCT_ISLOW:
|
||||
/* For LL&M IDCT method, divisors are equal to raw quantization
|
||||
* coefficients multiplied by 8 (to counteract scaling).
|
||||
*/
|
||||
if (fdct->divisors[qtblno] == NULL) {
|
||||
fdct->divisors[qtblno] = (DCTELEM *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(DCTELEM));
|
||||
}
|
||||
dtbl = fdct->divisors[qtblno];
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
dtbl[i] = ((DCTELEM) qtbl->quantval[i]) << 3;
|
||||
}
|
||||
break;
|
||||
#define PROVIDE_ISLOW_TABLES
|
||||
#else
|
||||
#ifdef DCT_SCALING_SUPPORTED
|
||||
#define PROVIDE_ISLOW_TABLES
|
||||
#endif
|
||||
#ifdef DCT_IFAST_SUPPORTED
|
||||
case JDCT_IFAST:
|
||||
{
|
||||
/* For AA&N IDCT method, divisors are equal to quantization
|
||||
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
||||
* scalefactor[0] = 1
|
||||
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
||||
* We apply a further scale factor of 8.
|
||||
*/
|
||||
#define CONST_BITS 14
|
||||
static const INT16 aanscales[DCTSIZE2] = {
|
||||
/* precomputed values scaled up by 14 bits */
|
||||
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
||||
22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
|
||||
21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
|
||||
19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
|
||||
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
||||
12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
|
||||
8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
|
||||
4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
|
||||
};
|
||||
SHIFT_TEMPS
|
||||
|
||||
if (fdct->divisors[qtblno] == NULL) {
|
||||
fdct->divisors[qtblno] = (DCTELEM *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(DCTELEM));
|
||||
}
|
||||
dtbl = fdct->divisors[qtblno];
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
dtbl[i] = (DCTELEM)
|
||||
DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],
|
||||
(INT32) aanscales[i]),
|
||||
CONST_BITS-3);
|
||||
}
|
||||
}
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_FLOAT_SUPPORTED
|
||||
case JDCT_FLOAT:
|
||||
{
|
||||
/* For float AA&N IDCT method, divisors are equal to quantization
|
||||
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
||||
* scalefactor[0] = 1
|
||||
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
||||
* We apply a further scale factor of 8.
|
||||
* What's actually stored is 1/divisor so that the inner loop can
|
||||
* use a multiplication rather than a division.
|
||||
*/
|
||||
FAST_FLOAT * fdtbl;
|
||||
int row, col;
|
||||
static const double aanscalefactor[DCTSIZE] = {
|
||||
1.0, 1.387039845, 1.306562965, 1.175875602,
|
||||
1.0, 0.785694958, 0.541196100, 0.275899379
|
||||
};
|
||||
|
||||
if (fdct->float_divisors[qtblno] == NULL) {
|
||||
fdct->float_divisors[qtblno] = (FAST_FLOAT *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(FAST_FLOAT));
|
||||
}
|
||||
fdtbl = fdct->float_divisors[qtblno];
|
||||
i = 0;
|
||||
for (row = 0; row < DCTSIZE; row++) {
|
||||
for (col = 0; col < DCTSIZE; col++) {
|
||||
fdtbl[i] = (FAST_FLOAT)
|
||||
(1.0 / (((double) qtbl->quantval[i] *
|
||||
aanscalefactor[row] * aanscalefactor[col] * 8.0)));
|
||||
i++;
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
@ -185,43 +70,16 @@ forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
{
|
||||
/* This routine is heavily used, so it's worth coding it tightly. */
|
||||
my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
|
||||
forward_DCT_method_ptr do_dct = fdct->do_dct;
|
||||
forward_DCT_method_ptr do_dct = fdct->do_dct[compptr->component_index];
|
||||
DCTELEM * divisors = fdct->divisors[compptr->quant_tbl_no];
|
||||
DCTELEM workspace[DCTSIZE2]; /* work area for FDCT subroutine */
|
||||
JDIMENSION bi;
|
||||
|
||||
sample_data += start_row; /* fold in the vertical offset once */
|
||||
|
||||
for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) {
|
||||
/* Load data into workspace, applying unsigned->signed conversion */
|
||||
{ register DCTELEM *workspaceptr;
|
||||
register JSAMPROW elemptr;
|
||||
register int elemr;
|
||||
|
||||
workspaceptr = workspace;
|
||||
for (elemr = 0; elemr < DCTSIZE; elemr++) {
|
||||
elemptr = sample_data[elemr] + start_col;
|
||||
#if DCTSIZE == 8 /* unroll the inner loop */
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
#else
|
||||
{ register int elemc;
|
||||
for (elemc = DCTSIZE; elemc > 0; elemc--) {
|
||||
*workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {
|
||||
/* Perform the DCT */
|
||||
(*do_dct) (workspace);
|
||||
(*do_dct) (workspace, sample_data, start_col);
|
||||
|
||||
/* Quantize/descale the coefficients, and store into coef_blocks[] */
|
||||
{ register DCTELEM temp, qval;
|
||||
@ -275,44 +133,16 @@ forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
{
|
||||
/* This routine is heavily used, so it's worth coding it tightly. */
|
||||
my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
|
||||
float_DCT_method_ptr do_dct = fdct->do_float_dct;
|
||||
float_DCT_method_ptr do_dct = fdct->do_float_dct[compptr->component_index];
|
||||
FAST_FLOAT * divisors = fdct->float_divisors[compptr->quant_tbl_no];
|
||||
FAST_FLOAT workspace[DCTSIZE2]; /* work area for FDCT subroutine */
|
||||
JDIMENSION bi;
|
||||
|
||||
sample_data += start_row; /* fold in the vertical offset once */
|
||||
|
||||
for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) {
|
||||
/* Load data into workspace, applying unsigned->signed conversion */
|
||||
{ register FAST_FLOAT *workspaceptr;
|
||||
register JSAMPROW elemptr;
|
||||
register int elemr;
|
||||
|
||||
workspaceptr = workspace;
|
||||
for (elemr = 0; elemr < DCTSIZE; elemr++) {
|
||||
elemptr = sample_data[elemr] + start_col;
|
||||
#if DCTSIZE == 8 /* unroll the inner loop */
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
*workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
#else
|
||||
{ register int elemc;
|
||||
for (elemc = DCTSIZE; elemc > 0; elemc--) {
|
||||
*workspaceptr++ = (FAST_FLOAT)
|
||||
(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {
|
||||
/* Perform the DCT */
|
||||
(*do_dct) (workspace);
|
||||
(*do_dct) (workspace, sample_data, start_col);
|
||||
|
||||
/* Quantize/descale the coefficients, and store into coef_blocks[] */
|
||||
{ register FAST_FLOAT temp;
|
||||
@ -337,6 +167,295 @@ forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
#endif /* DCT_FLOAT_SUPPORTED */
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for a processing pass.
|
||||
* Verify that all referenced Q-tables are present, and set up
|
||||
* the divisor table for each one.
|
||||
* In the current implementation, DCT of all components is done during
|
||||
* the first pass, even if only some components will be output in the
|
||||
* first scan. Hence all components should be examined here.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass_fdctmgr (j_compress_ptr cinfo)
|
||||
{
|
||||
my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
|
||||
int ci, qtblno, i;
|
||||
jpeg_component_info *compptr;
|
||||
int method = 0;
|
||||
JQUANT_TBL * qtbl;
|
||||
DCTELEM * dtbl;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
/* Select the proper DCT routine for this component's scaling */
|
||||
switch ((compptr->DCT_h_scaled_size << 8) + compptr->DCT_v_scaled_size) {
|
||||
#ifdef DCT_SCALING_SUPPORTED
|
||||
case ((1 << 8) + 1):
|
||||
fdct->do_dct[ci] = jpeg_fdct_1x1;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((2 << 8) + 2):
|
||||
fdct->do_dct[ci] = jpeg_fdct_2x2;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((3 << 8) + 3):
|
||||
fdct->do_dct[ci] = jpeg_fdct_3x3;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 4):
|
||||
fdct->do_dct[ci] = jpeg_fdct_4x4;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((5 << 8) + 5):
|
||||
fdct->do_dct[ci] = jpeg_fdct_5x5;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 6):
|
||||
fdct->do_dct[ci] = jpeg_fdct_6x6;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((7 << 8) + 7):
|
||||
fdct->do_dct[ci] = jpeg_fdct_7x7;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((9 << 8) + 9):
|
||||
fdct->do_dct[ci] = jpeg_fdct_9x9;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((10 << 8) + 10):
|
||||
fdct->do_dct[ci] = jpeg_fdct_10x10;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((11 << 8) + 11):
|
||||
fdct->do_dct[ci] = jpeg_fdct_11x11;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((12 << 8) + 12):
|
||||
fdct->do_dct[ci] = jpeg_fdct_12x12;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((13 << 8) + 13):
|
||||
fdct->do_dct[ci] = jpeg_fdct_13x13;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((14 << 8) + 14):
|
||||
fdct->do_dct[ci] = jpeg_fdct_14x14;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((15 << 8) + 15):
|
||||
fdct->do_dct[ci] = jpeg_fdct_15x15;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((16 << 8) + 16):
|
||||
fdct->do_dct[ci] = jpeg_fdct_16x16;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((16 << 8) + 8):
|
||||
fdct->do_dct[ci] = jpeg_fdct_16x8;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((14 << 8) + 7):
|
||||
fdct->do_dct[ci] = jpeg_fdct_14x7;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((12 << 8) + 6):
|
||||
fdct->do_dct[ci] = jpeg_fdct_12x6;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((10 << 8) + 5):
|
||||
fdct->do_dct[ci] = jpeg_fdct_10x5;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((8 << 8) + 4):
|
||||
fdct->do_dct[ci] = jpeg_fdct_8x4;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 3):
|
||||
fdct->do_dct[ci] = jpeg_fdct_6x3;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 2):
|
||||
fdct->do_dct[ci] = jpeg_fdct_4x2;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((2 << 8) + 1):
|
||||
fdct->do_dct[ci] = jpeg_fdct_2x1;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((8 << 8) + 16):
|
||||
fdct->do_dct[ci] = jpeg_fdct_8x16;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((7 << 8) + 14):
|
||||
fdct->do_dct[ci] = jpeg_fdct_7x14;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 12):
|
||||
fdct->do_dct[ci] = jpeg_fdct_6x12;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((5 << 8) + 10):
|
||||
fdct->do_dct[ci] = jpeg_fdct_5x10;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 8):
|
||||
fdct->do_dct[ci] = jpeg_fdct_4x8;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((3 << 8) + 6):
|
||||
fdct->do_dct[ci] = jpeg_fdct_3x6;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((2 << 8) + 4):
|
||||
fdct->do_dct[ci] = jpeg_fdct_2x4;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
case ((1 << 8) + 2):
|
||||
fdct->do_dct[ci] = jpeg_fdct_1x2;
|
||||
method = JDCT_ISLOW; /* jfdctint uses islow-style table */
|
||||
break;
|
||||
#endif
|
||||
case ((DCTSIZE << 8) + DCTSIZE):
|
||||
switch (cinfo->dct_method) {
|
||||
#ifdef DCT_ISLOW_SUPPORTED
|
||||
case JDCT_ISLOW:
|
||||
fdct->do_dct[ci] = jpeg_fdct_islow;
|
||||
method = JDCT_ISLOW;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_IFAST_SUPPORTED
|
||||
case JDCT_IFAST:
|
||||
fdct->do_dct[ci] = jpeg_fdct_ifast;
|
||||
method = JDCT_IFAST;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_FLOAT_SUPPORTED
|
||||
case JDCT_FLOAT:
|
||||
fdct->do_float_dct[ci] = jpeg_fdct_float;
|
||||
method = JDCT_FLOAT;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
|
||||
compptr->DCT_h_scaled_size, compptr->DCT_v_scaled_size);
|
||||
break;
|
||||
}
|
||||
qtblno = compptr->quant_tbl_no;
|
||||
/* Make sure specified quantization table is present */
|
||||
if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
|
||||
cinfo->quant_tbl_ptrs[qtblno] == NULL)
|
||||
ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
|
||||
qtbl = cinfo->quant_tbl_ptrs[qtblno];
|
||||
/* Compute divisors for this quant table */
|
||||
/* We may do this more than once for same table, but it's not a big deal */
|
||||
switch (method) {
|
||||
#ifdef PROVIDE_ISLOW_TABLES
|
||||
case JDCT_ISLOW:
|
||||
/* For LL&M IDCT method, divisors are equal to raw quantization
|
||||
* coefficients multiplied by 8 (to counteract scaling).
|
||||
*/
|
||||
if (fdct->divisors[qtblno] == NULL) {
|
||||
fdct->divisors[qtblno] = (DCTELEM *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(DCTELEM));
|
||||
}
|
||||
dtbl = fdct->divisors[qtblno];
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
dtbl[i] = ((DCTELEM) qtbl->quantval[i]) << 3;
|
||||
}
|
||||
fdct->pub.forward_DCT[ci] = forward_DCT;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_IFAST_SUPPORTED
|
||||
case JDCT_IFAST:
|
||||
{
|
||||
/* For AA&N IDCT method, divisors are equal to quantization
|
||||
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
||||
* scalefactor[0] = 1
|
||||
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
||||
* We apply a further scale factor of 8.
|
||||
*/
|
||||
#define CONST_BITS 14
|
||||
static const INT16 aanscales[DCTSIZE2] = {
|
||||
/* precomputed values scaled up by 14 bits */
|
||||
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
||||
22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
|
||||
21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
|
||||
19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
|
||||
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
||||
12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
|
||||
8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
|
||||
4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
|
||||
};
|
||||
SHIFT_TEMPS
|
||||
|
||||
if (fdct->divisors[qtblno] == NULL) {
|
||||
fdct->divisors[qtblno] = (DCTELEM *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(DCTELEM));
|
||||
}
|
||||
dtbl = fdct->divisors[qtblno];
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
dtbl[i] = (DCTELEM)
|
||||
DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],
|
||||
(INT32) aanscales[i]),
|
||||
CONST_BITS-3);
|
||||
}
|
||||
}
|
||||
fdct->pub.forward_DCT[ci] = forward_DCT;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_FLOAT_SUPPORTED
|
||||
case JDCT_FLOAT:
|
||||
{
|
||||
/* For float AA&N IDCT method, divisors are equal to quantization
|
||||
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
||||
* scalefactor[0] = 1
|
||||
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
||||
* We apply a further scale factor of 8.
|
||||
* What's actually stored is 1/divisor so that the inner loop can
|
||||
* use a multiplication rather than a division.
|
||||
*/
|
||||
FAST_FLOAT * fdtbl;
|
||||
int row, col;
|
||||
static const double aanscalefactor[DCTSIZE] = {
|
||||
1.0, 1.387039845, 1.306562965, 1.175875602,
|
||||
1.0, 0.785694958, 0.541196100, 0.275899379
|
||||
};
|
||||
|
||||
if (fdct->float_divisors[qtblno] == NULL) {
|
||||
fdct->float_divisors[qtblno] = (FAST_FLOAT *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
DCTSIZE2 * SIZEOF(FAST_FLOAT));
|
||||
}
|
||||
fdtbl = fdct->float_divisors[qtblno];
|
||||
i = 0;
|
||||
for (row = 0; row < DCTSIZE; row++) {
|
||||
for (col = 0; col < DCTSIZE; col++) {
|
||||
fdtbl[i] = (FAST_FLOAT)
|
||||
(1.0 / (((double) qtbl->quantval[i] *
|
||||
aanscalefactor[row] * aanscalefactor[col] * 8.0)));
|
||||
i++;
|
||||
}
|
||||
}
|
||||
}
|
||||
fdct->pub.forward_DCT[ci] = forward_DCT_float;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Initialize FDCT manager.
|
||||
*/
|
||||
@ -353,30 +472,6 @@ jinit_forward_dct (j_compress_ptr cinfo)
|
||||
cinfo->fdct = (struct jpeg_forward_dct *) fdct;
|
||||
fdct->pub.start_pass = start_pass_fdctmgr;
|
||||
|
||||
switch (cinfo->dct_method) {
|
||||
#ifdef DCT_ISLOW_SUPPORTED
|
||||
case JDCT_ISLOW:
|
||||
fdct->pub.forward_DCT = forward_DCT;
|
||||
fdct->do_dct = jpeg_fdct_islow;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_IFAST_SUPPORTED
|
||||
case JDCT_IFAST:
|
||||
fdct->pub.forward_DCT = forward_DCT;
|
||||
fdct->do_dct = jpeg_fdct_ifast;
|
||||
break;
|
||||
#endif
|
||||
#ifdef DCT_FLOAT_SUPPORTED
|
||||
case JDCT_FLOAT:
|
||||
fdct->pub.forward_DCT = forward_DCT_float;
|
||||
fdct->do_float_dct = jpeg_fdct_float;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
break;
|
||||
}
|
||||
|
||||
/* Mark divisor tables unallocated */
|
||||
for (i = 0; i < NUM_QUANT_TBLS; i++) {
|
||||
fdct->divisors[i] = NULL;
|
||||
|
1015
jpeg/jchuff.c
1015
jpeg/jchuff.c
File diff suppressed because it is too large
Load Diff
@ -1,47 +0,0 @@
|
||||
/*
|
||||
* jchuff.h
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains declarations for Huffman entropy encoding routines
|
||||
* that are shared between the sequential encoder (jchuff.c) and the
|
||||
* progressive encoder (jcphuff.c). No other modules need to see these.
|
||||
*/
|
||||
|
||||
/* The legal range of a DCT coefficient is
|
||||
* -1024 .. +1023 for 8-bit data;
|
||||
* -16384 .. +16383 for 12-bit data.
|
||||
* Hence the magnitude should always fit in 10 or 14 bits respectively.
|
||||
*/
|
||||
|
||||
#if BITS_IN_JSAMPLE == 8
|
||||
#define MAX_COEF_BITS 10
|
||||
#else
|
||||
#define MAX_COEF_BITS 14
|
||||
#endif
|
||||
|
||||
/* Derived data constructed for each Huffman table */
|
||||
|
||||
typedef struct {
|
||||
unsigned int ehufco[256]; /* code for each symbol */
|
||||
char ehufsi[256]; /* length of code for each symbol */
|
||||
/* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
|
||||
} c_derived_tbl;
|
||||
|
||||
/* Short forms of external names for systems with brain-damaged linkers. */
|
||||
|
||||
#ifdef NEED_SHORT_EXTERNAL_NAMES
|
||||
#define jpeg_make_c_derived_tbl jMkCDerived
|
||||
#define jpeg_gen_optimal_table jGenOptTbl
|
||||
#endif /* NEED_SHORT_EXTERNAL_NAMES */
|
||||
|
||||
/* Expand a Huffman table definition into the derived format */
|
||||
EXTERN(void) jpeg_make_c_derived_tbl
|
||||
JPP((j_compress_ptr cinfo, boolean isDC, int tblno,
|
||||
c_derived_tbl ** pdtbl));
|
||||
|
||||
/* Generate an optimal table definition given the specified counts */
|
||||
EXTERN(void) jpeg_gen_optimal_table
|
||||
JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));
|
@ -41,17 +41,10 @@ jinit_compress_master (j_compress_ptr cinfo)
|
||||
/* Forward DCT */
|
||||
jinit_forward_dct(cinfo);
|
||||
/* Entropy encoding: either Huffman or arithmetic coding. */
|
||||
if (cinfo->arith_code) {
|
||||
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
|
||||
} else {
|
||||
if (cinfo->progressive_mode) {
|
||||
#ifdef C_PROGRESSIVE_SUPPORTED
|
||||
jinit_phuff_encoder(cinfo);
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
#endif
|
||||
} else
|
||||
jinit_huff_encoder(cinfo);
|
||||
if (cinfo->arith_code)
|
||||
jinit_arith_encoder(cinfo);
|
||||
else {
|
||||
jinit_huff_encoder(cinfo);
|
||||
}
|
||||
|
||||
/* Need a full-image coefficient buffer in any multi-pass mode. */
|
||||
|
102
jpeg/jcmainct.c
102
jpeg/jcmainct.c
@ -68,32 +68,32 @@ METHODDEF(void) process_data_buffer_main
|
||||
METHODDEF(void)
|
||||
start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
|
||||
/* Do nothing in raw-data mode. */
|
||||
if (cinfo->raw_data_in)
|
||||
return;
|
||||
|
||||
jmain->cur_iMCU_row = 0; /* initialize counters */
|
||||
jmain->rowgroup_ctr = 0;
|
||||
jmain->suspended = FALSE;
|
||||
jmain->pass_mode = pass_mode; /* save mode for use by process_data */
|
||||
main->cur_iMCU_row = 0; /* initialize counters */
|
||||
main->rowgroup_ctr = 0;
|
||||
main->suspended = FALSE;
|
||||
main->pass_mode = pass_mode; /* save mode for use by process_data */
|
||||
|
||||
switch (pass_mode) {
|
||||
case JBUF_PASS_THRU:
|
||||
#ifdef FULL_MAIN_BUFFER_SUPPORTED
|
||||
if (jmain->whole_image[0] != NULL)
|
||||
if (main->whole_image[0] != NULL)
|
||||
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||||
#endif
|
||||
jmain->pub.process_data = process_data_simple_main;
|
||||
main->pub.process_data = process_data_simple_main;
|
||||
break;
|
||||
#ifdef FULL_MAIN_BUFFER_SUPPORTED
|
||||
case JBUF_SAVE_SOURCE:
|
||||
case JBUF_CRANK_DEST:
|
||||
case JBUF_SAVE_AND_PASS:
|
||||
if (jmain->whole_image[0] == NULL)
|
||||
if (main->whole_image[0] == NULL)
|
||||
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||||
jmain->pub.process_data = process_data_buffer_main;
|
||||
main->pub.process_data = process_data_buffer_main;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
@ -114,46 +114,46 @@ process_data_simple_main (j_compress_ptr cinfo,
|
||||
JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
|
||||
JDIMENSION in_rows_avail)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
|
||||
while (jmain->cur_iMCU_row < cinfo->total_iMCU_rows) {
|
||||
while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
|
||||
/* Read input data if we haven't filled the main buffer yet */
|
||||
if (jmain->rowgroup_ctr < DCTSIZE)
|
||||
if (main->rowgroup_ctr < (JDIMENSION) cinfo->min_DCT_v_scaled_size)
|
||||
(*cinfo->prep->pre_process_data) (cinfo,
|
||||
input_buf, in_row_ctr, in_rows_avail,
|
||||
jmain->buffer, &jmain->rowgroup_ctr,
|
||||
(JDIMENSION) DCTSIZE);
|
||||
main->buffer, &main->rowgroup_ctr,
|
||||
(JDIMENSION) cinfo->min_DCT_v_scaled_size);
|
||||
|
||||
/* If we don't have a full iMCU row buffered, return to application for
|
||||
* more data. Note that preprocessor will always pad to fill the iMCU row
|
||||
* at the bottom of the image.
|
||||
*/
|
||||
if (jmain->rowgroup_ctr != DCTSIZE)
|
||||
if (main->rowgroup_ctr != (JDIMENSION) cinfo->min_DCT_v_scaled_size)
|
||||
return;
|
||||
|
||||
/* Send the completed row to the compressor */
|
||||
if (! (*cinfo->coef->compress_data) (cinfo, jmain->buffer)) {
|
||||
if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
|
||||
/* If compressor did not consume the whole row, then we must need to
|
||||
* suspend processing and return to the application. In this situation
|
||||
* we pretend we didn't yet consume the last input row; otherwise, if
|
||||
* it happened to be the last row of the image, the application would
|
||||
* think we were done.
|
||||
*/
|
||||
if (! jmain->suspended) {
|
||||
if (! main->suspended) {
|
||||
(*in_row_ctr)--;
|
||||
jmain->suspended = TRUE;
|
||||
main->suspended = TRUE;
|
||||
}
|
||||
return;
|
||||
}
|
||||
/* We did finish the row. Undo our little suspension hack if a previous
|
||||
* call suspended; then mark the main buffer empty.
|
||||
*/
|
||||
if (jmain->suspended) {
|
||||
if (main->suspended) {
|
||||
(*in_row_ctr)++;
|
||||
jmain->suspended = FALSE;
|
||||
main->suspended = FALSE;
|
||||
}
|
||||
jmain->rowgroup_ctr = 0;
|
||||
jmain->cur_iMCU_row++;
|
||||
main->rowgroup_ctr = 0;
|
||||
main->cur_iMCU_row++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -170,25 +170,25 @@ process_data_buffer_main (j_compress_ptr cinfo,
|
||||
JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
|
||||
JDIMENSION in_rows_avail)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
int ci;
|
||||
jpeg_component_info *compptr;
|
||||
boolean writing = (jmain->pass_mode != JBUF_CRANK_DEST);
|
||||
boolean writing = (main->pass_mode != JBUF_CRANK_DEST);
|
||||
|
||||
while (jmain->cur_iMCU_row < cinfo->total_iMCU_rows) {
|
||||
while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
|
||||
/* Realign the virtual buffers if at the start of an iMCU row. */
|
||||
if (jmain->rowgroup_ctr == 0) {
|
||||
if (main->rowgroup_ctr == 0) {
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
jmain->buffer[ci] = (*cinfo->mem->access_virt_sarray)
|
||||
((j_common_ptr) cinfo, jmain->whole_image[ci],
|
||||
jmain->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
|
||||
main->buffer[ci] = (*cinfo->mem->access_virt_sarray)
|
||||
((j_common_ptr) cinfo, main->whole_image[ci],
|
||||
main->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
|
||||
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing);
|
||||
}
|
||||
/* In a read pass, pretend we just read some source data. */
|
||||
if (! writing) {
|
||||
*in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE;
|
||||
jmain->rowgroup_ctr = DCTSIZE;
|
||||
main->rowgroup_ctr = DCTSIZE;
|
||||
}
|
||||
}
|
||||
|
||||
@ -197,40 +197,40 @@ process_data_buffer_main (j_compress_ptr cinfo,
|
||||
if (writing) {
|
||||
(*cinfo->prep->pre_process_data) (cinfo,
|
||||
input_buf, in_row_ctr, in_rows_avail,
|
||||
jmain->buffer, &jmain->rowgroup_ctr,
|
||||
main->buffer, &main->rowgroup_ctr,
|
||||
(JDIMENSION) DCTSIZE);
|
||||
/* Return to application if we need more data to fill the iMCU row. */
|
||||
if (jmain->rowgroup_ctr < DCTSIZE)
|
||||
if (main->rowgroup_ctr < DCTSIZE)
|
||||
return;
|
||||
}
|
||||
|
||||
/* Emit data, unless this is a sink-only pass. */
|
||||
if (jmain->pass_mode != JBUF_SAVE_SOURCE) {
|
||||
if (! (*cinfo->coef->compress_data) (cinfo, jmain->buffer)) {
|
||||
if (main->pass_mode != JBUF_SAVE_SOURCE) {
|
||||
if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
|
||||
/* If compressor did not consume the whole row, then we must need to
|
||||
* suspend processing and return to the application. In this situation
|
||||
* we pretend we didn't yet consume the last input row; otherwise, if
|
||||
* it happened to be the last row of the image, the application would
|
||||
* think we were done.
|
||||
*/
|
||||
if (! jmain->suspended) {
|
||||
if (! main->suspended) {
|
||||
(*in_row_ctr)--;
|
||||
jmain->suspended = TRUE;
|
||||
main->suspended = TRUE;
|
||||
}
|
||||
return;
|
||||
}
|
||||
/* We did finish the row. Undo our little suspension hack if a previous
|
||||
* call suspended; then mark the main buffer empty.
|
||||
*/
|
||||
if (jmain->suspended) {
|
||||
if (main->suspended) {
|
||||
(*in_row_ctr)++;
|
||||
jmain->suspended = FALSE;
|
||||
main->suspended = FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
/* If get here, we are done with this iMCU row. Mark buffer empty. */
|
||||
jmain->rowgroup_ctr = 0;
|
||||
jmain->cur_iMCU_row++;
|
||||
main->rowgroup_ctr = 0;
|
||||
main->cur_iMCU_row++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -244,15 +244,15 @@ process_data_buffer_main (j_compress_ptr cinfo,
|
||||
GLOBAL(void)
|
||||
jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)
|
||||
{
|
||||
my_main_ptr jmain;
|
||||
my_main_ptr main;
|
||||
int ci;
|
||||
jpeg_component_info *compptr;
|
||||
|
||||
jmain = (my_main_ptr)
|
||||
main = (my_main_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(my_main_controller));
|
||||
cinfo->main = (struct jpeg_c_main_controller *) jmain;
|
||||
jmain->pub.start_pass = start_pass_main;
|
||||
cinfo->main = (struct jpeg_c_main_controller *) main;
|
||||
main->pub.start_pass = start_pass_main;
|
||||
|
||||
/* We don't need to create a buffer in raw-data mode. */
|
||||
if (cinfo->raw_data_in)
|
||||
@ -267,27 +267,27 @@ jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)
|
||||
/* Note we pad the bottom to a multiple of the iMCU height */
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
jmain->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
|
||||
main->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
|
||||
compptr->width_in_blocks * DCTSIZE,
|
||||
compptr->width_in_blocks * compptr->DCT_h_scaled_size,
|
||||
(JDIMENSION) jround_up((long) compptr->height_in_blocks,
|
||||
(long) compptr->v_samp_factor) * DCTSIZE,
|
||||
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
|
||||
(JDIMENSION) (compptr->v_samp_factor * compptr->DCT_v_scaled_size));
|
||||
}
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||||
#endif
|
||||
} else {
|
||||
#ifdef FULL_MAIN_BUFFER_SUPPORTED
|
||||
jmain->whole_image[0] = NULL; /* flag for no virtual arrays */
|
||||
main->whole_image[0] = NULL; /* flag for no virtual arrays */
|
||||
#endif
|
||||
/* Allocate a strip buffer for each component */
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
jmain->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
||||
main->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
compptr->width_in_blocks * DCTSIZE,
|
||||
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
|
||||
compptr->width_in_blocks * compptr->DCT_h_scaled_size,
|
||||
(JDIMENSION) (compptr->v_samp_factor * compptr->DCT_v_scaled_size));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jcmarker.c
|
||||
*
|
||||
* Copyright (C) 1991-1998, Thomas G. Lane.
|
||||
* Modified 2003-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -153,21 +154,22 @@ emit_dqt (j_compress_ptr cinfo, int index)
|
||||
ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
|
||||
|
||||
prec = 0;
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
if (qtbl->quantval[i] > 255)
|
||||
for (i = 0; i <= cinfo->lim_Se; i++) {
|
||||
if (qtbl->quantval[cinfo->natural_order[i]] > 255)
|
||||
prec = 1;
|
||||
}
|
||||
|
||||
if (! qtbl->sent_table) {
|
||||
emit_marker(cinfo, M_DQT);
|
||||
|
||||
emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
|
||||
emit_2bytes(cinfo,
|
||||
prec ? cinfo->lim_Se * 2 + 2 + 1 + 2 : cinfo->lim_Se + 1 + 1 + 2);
|
||||
|
||||
emit_byte(cinfo, index + (prec<<4));
|
||||
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
for (i = 0; i <= cinfo->lim_Se; i++) {
|
||||
/* The table entries must be emitted in zigzag order. */
|
||||
unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
|
||||
unsigned int qval = qtbl->quantval[cinfo->natural_order[i]];
|
||||
if (prec)
|
||||
emit_byte(cinfo, (int) (qval >> 8));
|
||||
emit_byte(cinfo, (int) (qval & 0xFF));
|
||||
@ -235,8 +237,12 @@ emit_dac (j_compress_ptr cinfo)
|
||||
|
||||
for (i = 0; i < cinfo->comps_in_scan; i++) {
|
||||
compptr = cinfo->cur_comp_info[i];
|
||||
dc_in_use[compptr->dc_tbl_no] = 1;
|
||||
ac_in_use[compptr->ac_tbl_no] = 1;
|
||||
/* DC needs no table for refinement scan */
|
||||
if (cinfo->Ss == 0 && cinfo->Ah == 0)
|
||||
dc_in_use[compptr->dc_tbl_no] = 1;
|
||||
/* AC needs no table when not present */
|
||||
if (cinfo->Se)
|
||||
ac_in_use[compptr->ac_tbl_no] = 1;
|
||||
}
|
||||
|
||||
length = 0;
|
||||
@ -285,13 +291,13 @@ emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
|
||||
emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
|
||||
|
||||
/* Make sure image isn't bigger than SOF field can handle */
|
||||
if ((long) cinfo->image_height > 65535L ||
|
||||
(long) cinfo->image_width > 65535L)
|
||||
if ((long) cinfo->jpeg_height > 65535L ||
|
||||
(long) cinfo->jpeg_width > 65535L)
|
||||
ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
|
||||
|
||||
emit_byte(cinfo, cinfo->data_precision);
|
||||
emit_2bytes(cinfo, (int) cinfo->image_height);
|
||||
emit_2bytes(cinfo, (int) cinfo->image_width);
|
||||
emit_2bytes(cinfo, (int) cinfo->jpeg_height);
|
||||
emit_2bytes(cinfo, (int) cinfo->jpeg_width);
|
||||
|
||||
emit_byte(cinfo, cinfo->num_components);
|
||||
|
||||
@ -320,22 +326,16 @@ emit_sos (j_compress_ptr cinfo)
|
||||
for (i = 0; i < cinfo->comps_in_scan; i++) {
|
||||
compptr = cinfo->cur_comp_info[i];
|
||||
emit_byte(cinfo, compptr->component_id);
|
||||
td = compptr->dc_tbl_no;
|
||||
ta = compptr->ac_tbl_no;
|
||||
if (cinfo->progressive_mode) {
|
||||
/* Progressive mode: only DC or only AC tables are used in one scan;
|
||||
* furthermore, Huffman coding of DC refinement uses no table at all.
|
||||
* We emit 0 for unused field(s); this is recommended by the P&M text
|
||||
* but does not seem to be specified in the standard.
|
||||
*/
|
||||
if (cinfo->Ss == 0) {
|
||||
ta = 0; /* DC scan */
|
||||
if (cinfo->Ah != 0 && !cinfo->arith_code)
|
||||
td = 0; /* no DC table either */
|
||||
} else {
|
||||
td = 0; /* AC scan */
|
||||
}
|
||||
}
|
||||
|
||||
/* We emit 0 for unused field(s); this is recommended by the P&M text
|
||||
* but does not seem to be specified in the standard.
|
||||
*/
|
||||
|
||||
/* DC needs no table for refinement scan */
|
||||
td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
|
||||
/* AC needs no table when not present */
|
||||
ta = cinfo->Se ? compptr->ac_tbl_no : 0;
|
||||
|
||||
emit_byte(cinfo, (td << 4) + ta);
|
||||
}
|
||||
|
||||
@ -345,6 +345,22 @@ emit_sos (j_compress_ptr cinfo)
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
emit_pseudo_sos (j_compress_ptr cinfo)
|
||||
/* Emit a pseudo SOS marker */
|
||||
{
|
||||
emit_marker(cinfo, M_SOS);
|
||||
|
||||
emit_2bytes(cinfo, 2 + 1 + 3); /* length */
|
||||
|
||||
emit_byte(cinfo, 0); /* Ns */
|
||||
|
||||
emit_byte(cinfo, 0); /* Ss */
|
||||
emit_byte(cinfo, cinfo->block_size * cinfo->block_size - 1); /* Se */
|
||||
emit_byte(cinfo, 0); /* Ah/Al */
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
emit_jfif_app0 (j_compress_ptr cinfo)
|
||||
/* Emit a JFIF-compliant APP0 marker */
|
||||
@ -484,7 +500,7 @@ write_file_header (j_compress_ptr cinfo)
|
||||
|
||||
/*
|
||||
* Write frame header.
|
||||
* This consists of DQT and SOFn markers.
|
||||
* This consists of DQT and SOFn markers, and a conditional pseudo SOS marker.
|
||||
* Note that we do not emit the SOF until we have emitted the DQT(s).
|
||||
* This avoids compatibility problems with incorrect implementations that
|
||||
* try to error-check the quant table numbers as soon as they see the SOF.
|
||||
@ -511,7 +527,7 @@ write_frame_header (j_compress_ptr cinfo)
|
||||
* Note we assume that Huffman table numbers won't be changed later.
|
||||
*/
|
||||
if (cinfo->arith_code || cinfo->progressive_mode ||
|
||||
cinfo->data_precision != 8) {
|
||||
cinfo->data_precision != 8 || cinfo->block_size != DCTSIZE) {
|
||||
is_baseline = FALSE;
|
||||
} else {
|
||||
is_baseline = TRUE;
|
||||
@ -529,7 +545,10 @@ write_frame_header (j_compress_ptr cinfo)
|
||||
|
||||
/* Emit the proper SOF marker */
|
||||
if (cinfo->arith_code) {
|
||||
emit_sof(cinfo, M_SOF9); /* SOF code for arithmetic coding */
|
||||
if (cinfo->progressive_mode)
|
||||
emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
|
||||
else
|
||||
emit_sof(cinfo, M_SOF9); /* SOF code for sequential arithmetic */
|
||||
} else {
|
||||
if (cinfo->progressive_mode)
|
||||
emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
|
||||
@ -538,6 +557,10 @@ write_frame_header (j_compress_ptr cinfo)
|
||||
else
|
||||
emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
|
||||
}
|
||||
|
||||
/* Check to emit pseudo SOS marker */
|
||||
if (cinfo->progressive_mode && cinfo->block_size != DCTSIZE)
|
||||
emit_pseudo_sos(cinfo);
|
||||
}
|
||||
|
||||
|
||||
@ -566,19 +589,12 @@ write_scan_header (j_compress_ptr cinfo)
|
||||
*/
|
||||
for (i = 0; i < cinfo->comps_in_scan; i++) {
|
||||
compptr = cinfo->cur_comp_info[i];
|
||||
if (cinfo->progressive_mode) {
|
||||
/* Progressive mode: only DC or only AC tables are used in one scan */
|
||||
if (cinfo->Ss == 0) {
|
||||
if (cinfo->Ah == 0) /* DC needs no table for refinement scan */
|
||||
emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
|
||||
} else {
|
||||
emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
|
||||
}
|
||||
} else {
|
||||
/* Sequential mode: need both DC and AC tables */
|
||||
/* DC needs no table for refinement scan */
|
||||
if (cinfo->Ss == 0 && cinfo->Ah == 0)
|
||||
emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
|
||||
/* AC needs no table when not present */
|
||||
if (cinfo->Se)
|
||||
emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
322
jpeg/jcmaster.c
322
jpeg/jcmaster.c
@ -2,6 +2,7 @@
|
||||
* jcmaster.c
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 2003-2010 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -42,23 +43,200 @@ typedef my_comp_master * my_master_ptr;
|
||||
* Support routines that do various essential calculations.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
initial_setup (j_compress_ptr cinfo)
|
||||
/*
|
||||
* Compute JPEG image dimensions and related values.
|
||||
* NOTE: this is exported for possible use by application.
|
||||
* Hence it mustn't do anything that can't be done twice.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
|
||||
/* Do computations that are needed before master selection phase */
|
||||
{
|
||||
int ci;
|
||||
#ifdef DCT_SCALING_SUPPORTED
|
||||
|
||||
/* Compute actual JPEG image dimensions and DCT scaling choices. */
|
||||
if (cinfo->scale_num >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/1 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width << 3;
|
||||
cinfo->jpeg_height = cinfo->image_height << 3;
|
||||
cinfo->min_DCT_h_scaled_size = 1;
|
||||
cinfo->min_DCT_v_scaled_size = 1;
|
||||
} else if (cinfo->scale_num >= cinfo->scale_denom * 4) {
|
||||
/* Provide 4/1 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width << 2;
|
||||
cinfo->jpeg_height = cinfo->image_height << 2;
|
||||
cinfo->min_DCT_h_scaled_size = 2;
|
||||
cinfo->min_DCT_v_scaled_size = 2;
|
||||
} else if (cinfo->scale_num * 3 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/3 scaling */
|
||||
cinfo->jpeg_width = (cinfo->image_width << 1) + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 2, 3L);
|
||||
cinfo->jpeg_height = (cinfo->image_height << 1) + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 2, 3L);
|
||||
cinfo->min_DCT_h_scaled_size = 3;
|
||||
cinfo->min_DCT_v_scaled_size = 3;
|
||||
} else if (cinfo->scale_num >= cinfo->scale_denom * 2) {
|
||||
/* Provide 2/1 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width << 1;
|
||||
cinfo->jpeg_height = cinfo->image_height << 1;
|
||||
cinfo->min_DCT_h_scaled_size = 4;
|
||||
cinfo->min_DCT_v_scaled_size = 4;
|
||||
} else if (cinfo->scale_num * 5 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/5 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 3, 5L);
|
||||
cinfo->jpeg_height = cinfo->image_height + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 3, 5L);
|
||||
cinfo->min_DCT_h_scaled_size = 5;
|
||||
cinfo->min_DCT_v_scaled_size = 5;
|
||||
} else if (cinfo->scale_num * 3 >= cinfo->scale_denom * 4) {
|
||||
/* Provide 4/3 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 3L);
|
||||
cinfo->jpeg_height = cinfo->image_height + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 3L);
|
||||
cinfo->min_DCT_h_scaled_size = 6;
|
||||
cinfo->min_DCT_v_scaled_size = 6;
|
||||
} else if (cinfo->scale_num * 7 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/7 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 7L);
|
||||
cinfo->jpeg_height = cinfo->image_height + (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 7L);
|
||||
cinfo->min_DCT_h_scaled_size = 7;
|
||||
cinfo->min_DCT_v_scaled_size = 7;
|
||||
} else if (cinfo->scale_num >= cinfo->scale_denom) {
|
||||
/* Provide 1/1 scaling */
|
||||
cinfo->jpeg_width = cinfo->image_width;
|
||||
cinfo->jpeg_height = cinfo->image_height;
|
||||
cinfo->min_DCT_h_scaled_size = 8;
|
||||
cinfo->min_DCT_v_scaled_size = 8;
|
||||
} else if (cinfo->scale_num * 9 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/9 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 8, 9L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 8, 9L);
|
||||
cinfo->min_DCT_h_scaled_size = 9;
|
||||
cinfo->min_DCT_v_scaled_size = 9;
|
||||
} else if (cinfo->scale_num * 5 >= cinfo->scale_denom * 4) {
|
||||
/* Provide 4/5 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 4, 5L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 4, 5L);
|
||||
cinfo->min_DCT_h_scaled_size = 10;
|
||||
cinfo->min_DCT_v_scaled_size = 10;
|
||||
} else if (cinfo->scale_num * 11 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/11 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 8, 11L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 8, 11L);
|
||||
cinfo->min_DCT_h_scaled_size = 11;
|
||||
cinfo->min_DCT_v_scaled_size = 11;
|
||||
} else if (cinfo->scale_num * 3 >= cinfo->scale_denom * 2) {
|
||||
/* Provide 2/3 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 2, 3L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 2, 3L);
|
||||
cinfo->min_DCT_h_scaled_size = 12;
|
||||
cinfo->min_DCT_v_scaled_size = 12;
|
||||
} else if (cinfo->scale_num * 13 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/13 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 8, 13L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 8, 13L);
|
||||
cinfo->min_DCT_h_scaled_size = 13;
|
||||
cinfo->min_DCT_v_scaled_size = 13;
|
||||
} else if (cinfo->scale_num * 7 >= cinfo->scale_denom * 4) {
|
||||
/* Provide 4/7 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 4, 7L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 4, 7L);
|
||||
cinfo->min_DCT_h_scaled_size = 14;
|
||||
cinfo->min_DCT_v_scaled_size = 14;
|
||||
} else if (cinfo->scale_num * 15 >= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/15 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 8, 15L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 8, 15L);
|
||||
cinfo->min_DCT_h_scaled_size = 15;
|
||||
cinfo->min_DCT_v_scaled_size = 15;
|
||||
} else {
|
||||
/* Provide 1/2 scaling */
|
||||
cinfo->jpeg_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 2L);
|
||||
cinfo->jpeg_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 2L);
|
||||
cinfo->min_DCT_h_scaled_size = 16;
|
||||
cinfo->min_DCT_v_scaled_size = 16;
|
||||
}
|
||||
|
||||
#else /* !DCT_SCALING_SUPPORTED */
|
||||
|
||||
/* Hardwire it to "no scaling" */
|
||||
cinfo->jpeg_width = cinfo->image_width;
|
||||
cinfo->jpeg_height = cinfo->image_height;
|
||||
cinfo->min_DCT_h_scaled_size = DCTSIZE;
|
||||
cinfo->min_DCT_v_scaled_size = DCTSIZE;
|
||||
|
||||
#endif /* DCT_SCALING_SUPPORTED */
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
jpeg_calc_trans_dimensions (j_compress_ptr cinfo)
|
||||
{
|
||||
if (cinfo->min_DCT_h_scaled_size < 1 || cinfo->min_DCT_h_scaled_size > 16
|
||||
|| cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size)
|
||||
ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
|
||||
cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size);
|
||||
|
||||
cinfo->block_size = cinfo->min_DCT_h_scaled_size;
|
||||
|
||||
switch (cinfo->block_size) {
|
||||
case 2: cinfo->natural_order = jpeg_natural_order2; break;
|
||||
case 3: cinfo->natural_order = jpeg_natural_order3; break;
|
||||
case 4: cinfo->natural_order = jpeg_natural_order4; break;
|
||||
case 5: cinfo->natural_order = jpeg_natural_order5; break;
|
||||
case 6: cinfo->natural_order = jpeg_natural_order6; break;
|
||||
case 7: cinfo->natural_order = jpeg_natural_order7; break;
|
||||
default: cinfo->natural_order = jpeg_natural_order; break;
|
||||
}
|
||||
|
||||
cinfo->lim_Se = cinfo->block_size < DCTSIZE ?
|
||||
cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1;
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
initial_setup (j_compress_ptr cinfo, boolean transcode_only)
|
||||
/* Do computations that are needed before master selection phase */
|
||||
{
|
||||
int ci, ssize;
|
||||
jpeg_component_info *compptr;
|
||||
long samplesperrow;
|
||||
JDIMENSION jd_samplesperrow;
|
||||
|
||||
if (transcode_only)
|
||||
jpeg_calc_trans_dimensions(cinfo);
|
||||
else
|
||||
jpeg_calc_jpeg_dimensions(cinfo);
|
||||
|
||||
/* Sanity check on image dimensions */
|
||||
if (cinfo->image_height <= 0 || cinfo->image_width <= 0
|
||||
|| cinfo->num_components <= 0 || cinfo->input_components <= 0)
|
||||
if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0 ||
|
||||
cinfo->num_components <= 0 || cinfo->input_components <= 0)
|
||||
ERREXIT(cinfo, JERR_EMPTY_IMAGE);
|
||||
|
||||
/* Make sure image isn't bigger than I can handle */
|
||||
if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
|
||||
(long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
|
||||
if ((long) cinfo->jpeg_height > (long) JPEG_MAX_DIMENSION ||
|
||||
(long) cinfo->jpeg_width > (long) JPEG_MAX_DIMENSION)
|
||||
ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
|
||||
|
||||
/* Width of an input scanline must be representable as JDIMENSION. */
|
||||
@ -95,22 +273,52 @@ initial_setup (j_compress_ptr cinfo)
|
||||
ci++, compptr++) {
|
||||
/* Fill in the correct component_index value; don't rely on application */
|
||||
compptr->component_index = ci;
|
||||
/* For compression, we never do DCT scaling. */
|
||||
compptr->DCT_scaled_size = DCTSIZE;
|
||||
/* In selecting the actual DCT scaling for each component, we try to
|
||||
* scale down the chroma components via DCT scaling rather than downsampling.
|
||||
* This saves time if the downsampler gets to use 1:1 scaling.
|
||||
* Note this code adapts subsampling ratios which are powers of 2.
|
||||
*/
|
||||
ssize = 1;
|
||||
#ifdef DCT_SCALING_SUPPORTED
|
||||
while (cinfo->min_DCT_h_scaled_size * ssize <=
|
||||
(cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
|
||||
(cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) {
|
||||
ssize = ssize * 2;
|
||||
}
|
||||
#endif
|
||||
compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize;
|
||||
ssize = 1;
|
||||
#ifdef DCT_SCALING_SUPPORTED
|
||||
while (cinfo->min_DCT_v_scaled_size * ssize <=
|
||||
(cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
|
||||
(cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) {
|
||||
ssize = ssize * 2;
|
||||
}
|
||||
#endif
|
||||
compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize;
|
||||
|
||||
/* We don't support DCT ratios larger than 2. */
|
||||
if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2)
|
||||
compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2;
|
||||
else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2)
|
||||
compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2;
|
||||
|
||||
/* Size in DCT blocks */
|
||||
compptr->width_in_blocks = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
|
||||
(long) (cinfo->max_h_samp_factor * DCTSIZE));
|
||||
jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor,
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
compptr->height_in_blocks = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
|
||||
(long) (cinfo->max_v_samp_factor * DCTSIZE));
|
||||
jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor,
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
/* Size in samples */
|
||||
compptr->downsampled_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
|
||||
(long) cinfo->max_h_samp_factor);
|
||||
jdiv_round_up((long) cinfo->jpeg_width *
|
||||
(long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
compptr->downsampled_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
|
||||
(long) cinfo->max_v_samp_factor);
|
||||
jdiv_round_up((long) cinfo->jpeg_height *
|
||||
(long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
/* Mark component needed (this flag isn't actually used for compression) */
|
||||
compptr->component_needed = TRUE;
|
||||
}
|
||||
@ -119,8 +327,8 @@ initial_setup (j_compress_ptr cinfo)
|
||||
* main controller will call coefficient controller).
|
||||
*/
|
||||
cinfo->total_iMCU_rows = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height,
|
||||
(long) (cinfo->max_v_samp_factor*DCTSIZE));
|
||||
jdiv_round_up((long) cinfo->jpeg_height,
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
}
|
||||
|
||||
|
||||
@ -260,6 +468,39 @@ validate_script (j_compress_ptr cinfo)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
reduce_script (j_compress_ptr cinfo)
|
||||
/* Adapt scan script for use with reduced block size;
|
||||
* assume that script has been validated before.
|
||||
*/
|
||||
{
|
||||
jpeg_scan_info * scanptr;
|
||||
int idxout, idxin;
|
||||
|
||||
/* Circumvent const declaration for this function */
|
||||
scanptr = (jpeg_scan_info *) cinfo->scan_info;
|
||||
idxout = 0;
|
||||
|
||||
for (idxin = 0; idxin < cinfo->num_scans; idxin++) {
|
||||
/* After skipping, idxout becomes smaller than idxin */
|
||||
if (idxin != idxout)
|
||||
/* Copy rest of data;
|
||||
* note we stay in given chunk of allocated memory.
|
||||
*/
|
||||
scanptr[idxout] = scanptr[idxin];
|
||||
if (scanptr[idxout].Ss > cinfo->lim_Se)
|
||||
/* Entire scan out of range - skip this entry */
|
||||
continue;
|
||||
if (scanptr[idxout].Se > cinfo->lim_Se)
|
||||
/* Limit scan to end of block */
|
||||
scanptr[idxout].Se = cinfo->lim_Se;
|
||||
idxout++;
|
||||
}
|
||||
|
||||
cinfo->num_scans = idxout;
|
||||
}
|
||||
|
||||
#endif /* C_MULTISCAN_FILES_SUPPORTED */
|
||||
|
||||
|
||||
@ -280,10 +521,13 @@ select_scan_parameters (j_compress_ptr cinfo)
|
||||
cinfo->cur_comp_info[ci] =
|
||||
&cinfo->comp_info[scanptr->component_index[ci]];
|
||||
}
|
||||
cinfo->Ss = scanptr->Ss;
|
||||
cinfo->Se = scanptr->Se;
|
||||
cinfo->Ah = scanptr->Ah;
|
||||
cinfo->Al = scanptr->Al;
|
||||
if (cinfo->progressive_mode) {
|
||||
cinfo->Ss = scanptr->Ss;
|
||||
cinfo->Se = scanptr->Se;
|
||||
cinfo->Ah = scanptr->Ah;
|
||||
cinfo->Al = scanptr->Al;
|
||||
return;
|
||||
}
|
||||
}
|
||||
else
|
||||
#endif
|
||||
@ -296,11 +540,11 @@ select_scan_parameters (j_compress_ptr cinfo)
|
||||
for (ci = 0; ci < cinfo->num_components; ci++) {
|
||||
cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
|
||||
}
|
||||
cinfo->Ss = 0;
|
||||
cinfo->Se = DCTSIZE2-1;
|
||||
cinfo->Ah = 0;
|
||||
cinfo->Al = 0;
|
||||
}
|
||||
cinfo->Ss = 0;
|
||||
cinfo->Se = cinfo->block_size * cinfo->block_size - 1;
|
||||
cinfo->Ah = 0;
|
||||
cinfo->Al = 0;
|
||||
}
|
||||
|
||||
|
||||
@ -325,7 +569,7 @@ per_scan_setup (j_compress_ptr cinfo)
|
||||
compptr->MCU_width = 1;
|
||||
compptr->MCU_height = 1;
|
||||
compptr->MCU_blocks = 1;
|
||||
compptr->MCU_sample_width = DCTSIZE;
|
||||
compptr->MCU_sample_width = compptr->DCT_h_scaled_size;
|
||||
compptr->last_col_width = 1;
|
||||
/* For noninterleaved scans, it is convenient to define last_row_height
|
||||
* as the number of block rows present in the last iMCU row.
|
||||
@ -347,11 +591,11 @@ per_scan_setup (j_compress_ptr cinfo)
|
||||
|
||||
/* Overall image size in MCUs */
|
||||
cinfo->MCUs_per_row = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width,
|
||||
(long) (cinfo->max_h_samp_factor*DCTSIZE));
|
||||
jdiv_round_up((long) cinfo->jpeg_width,
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
cinfo->MCU_rows_in_scan = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height,
|
||||
(long) (cinfo->max_v_samp_factor*DCTSIZE));
|
||||
jdiv_round_up((long) cinfo->jpeg_height,
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
|
||||
cinfo->blocks_in_MCU = 0;
|
||||
|
||||
@ -361,7 +605,7 @@ per_scan_setup (j_compress_ptr cinfo)
|
||||
compptr->MCU_width = compptr->h_samp_factor;
|
||||
compptr->MCU_height = compptr->v_samp_factor;
|
||||
compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
|
||||
compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
|
||||
compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_h_scaled_size;
|
||||
/* Figure number of non-dummy blocks in last MCU column & row */
|
||||
tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
|
||||
if (tmp == 0) tmp = compptr->MCU_width;
|
||||
@ -433,7 +677,7 @@ prepare_for_pass (j_compress_ptr cinfo)
|
||||
/* Do Huffman optimization for a scan after the first one. */
|
||||
select_scan_parameters(cinfo);
|
||||
per_scan_setup(cinfo);
|
||||
if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
|
||||
if (cinfo->Ss != 0 || cinfo->Ah == 0) {
|
||||
(*cinfo->entropy->start_pass) (cinfo, TRUE);
|
||||
(*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
|
||||
master->pub.call_pass_startup = FALSE;
|
||||
@ -554,11 +798,13 @@ jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
|
||||
master->pub.is_last_pass = FALSE;
|
||||
|
||||
/* Validate parameters, determine derived values */
|
||||
initial_setup(cinfo);
|
||||
initial_setup(cinfo, transcode_only);
|
||||
|
||||
if (cinfo->scan_info != NULL) {
|
||||
#ifdef C_MULTISCAN_FILES_SUPPORTED
|
||||
validate_script(cinfo);
|
||||
if (cinfo->block_size < DCTSIZE)
|
||||
reduce_script(cinfo);
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
#endif
|
||||
@ -567,8 +813,10 @@ jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
|
||||
cinfo->num_scans = 1;
|
||||
}
|
||||
|
||||
if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */
|
||||
cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
|
||||
if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) &&
|
||||
!cinfo->arith_code) /* TEMPORARY HACK ??? */
|
||||
/* assume default tables no good for progressive or downscale mode */
|
||||
cinfo->optimize_coding = TRUE;
|
||||
|
||||
/* Initialize my private state */
|
||||
if (transcode_only) {
|
||||
|
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* jconfig.doc
|
||||
* jconfig.txt
|
||||
*
|
||||
* Copyright (C) 1991-1994, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
@ -24,7 +24,7 @@
|
||||
*/
|
||||
|
||||
/* Does your compiler support function prototypes?
|
||||
* (If not, you also need to use ansi2knr, see install.doc)
|
||||
* (If not, you also need to use ansi2knr, see install.txt)
|
||||
*/
|
||||
#define HAVE_PROTOTYPES
|
||||
|
||||
@ -91,6 +91,15 @@
|
||||
*/
|
||||
#undef INCOMPLETE_TYPES_BROKEN
|
||||
|
||||
/* Define "boolean" as unsigned char, not int, on Windows systems.
|
||||
*/
|
||||
#ifdef _WIN32
|
||||
#ifndef __RPCNDR_H__ /* don't conflict if rpcndr.h already read */
|
||||
typedef unsigned char boolean;
|
||||
#endif
|
||||
#define HAVE_BOOLEAN /* prevent jmorecfg.h from redefining it */
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* The following options affect code selection within the JPEG library,
|
@ -2,6 +2,7 @@
|
||||
* jcparam.c
|
||||
*
|
||||
* Copyright (C) 1991-1998, Thomas G. Lane.
|
||||
* Modified 2003-2008 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -60,6 +61,47 @@ jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
|
||||
}
|
||||
|
||||
|
||||
/* These are the sample quantization tables given in JPEG spec section K.1.
|
||||
* The spec says that the values given produce "good" quality, and
|
||||
* when divided by 2, "very good" quality.
|
||||
*/
|
||||
static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
|
||||
16, 11, 10, 16, 24, 40, 51, 61,
|
||||
12, 12, 14, 19, 26, 58, 60, 55,
|
||||
14, 13, 16, 24, 40, 57, 69, 56,
|
||||
14, 17, 22, 29, 51, 87, 80, 62,
|
||||
18, 22, 37, 56, 68, 109, 103, 77,
|
||||
24, 35, 55, 64, 81, 104, 113, 92,
|
||||
49, 64, 78, 87, 103, 121, 120, 101,
|
||||
72, 92, 95, 98, 112, 100, 103, 99
|
||||
};
|
||||
static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
|
||||
17, 18, 24, 47, 99, 99, 99, 99,
|
||||
18, 21, 26, 66, 99, 99, 99, 99,
|
||||
24, 26, 56, 99, 99, 99, 99, 99,
|
||||
47, 66, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99
|
||||
};
|
||||
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
|
||||
/* Set or change the 'quality' (quantization) setting, using default tables
|
||||
* and straight percentage-scaling quality scales.
|
||||
* This entry point allows different scalings for luminance and chrominance.
|
||||
*/
|
||||
{
|
||||
/* Set up two quantization tables using the specified scaling */
|
||||
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
|
||||
cinfo->q_scale_factor[0], force_baseline);
|
||||
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
|
||||
cinfo->q_scale_factor[1], force_baseline);
|
||||
}
|
||||
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
|
||||
boolean force_baseline)
|
||||
@ -69,31 +111,6 @@ jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
|
||||
* applications that insist on a linear percentage scaling.
|
||||
*/
|
||||
{
|
||||
/* These are the sample quantization tables given in JPEG spec section K.1.
|
||||
* The spec says that the values given produce "good" quality, and
|
||||
* when divided by 2, "very good" quality.
|
||||
*/
|
||||
static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
|
||||
16, 11, 10, 16, 24, 40, 51, 61,
|
||||
12, 12, 14, 19, 26, 58, 60, 55,
|
||||
14, 13, 16, 24, 40, 57, 69, 56,
|
||||
14, 17, 22, 29, 51, 87, 80, 62,
|
||||
18, 22, 37, 56, 68, 109, 103, 77,
|
||||
24, 35, 55, 64, 81, 104, 113, 92,
|
||||
49, 64, 78, 87, 103, 121, 120, 101,
|
||||
72, 92, 95, 98, 112, 100, 103, 99
|
||||
};
|
||||
static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
|
||||
17, 18, 24, 47, 99, 99, 99, 99,
|
||||
18, 21, 26, 66, 99, 99, 99, 99,
|
||||
24, 26, 56, 99, 99, 99, 99, 99,
|
||||
47, 66, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99
|
||||
};
|
||||
|
||||
/* Set up two quantization tables using the specified scaling */
|
||||
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
|
||||
scale_factor, force_baseline);
|
||||
@ -284,6 +301,8 @@ jpeg_set_defaults (j_compress_ptr cinfo)
|
||||
|
||||
/* Initialize everything not dependent on the color space */
|
||||
|
||||
cinfo->scale_num = 1; /* 1:1 scaling */
|
||||
cinfo->scale_denom = 1;
|
||||
cinfo->data_precision = BITS_IN_JSAMPLE;
|
||||
/* Set up two quantization tables using default quality of 75 */
|
||||
jpeg_set_quality(cinfo, 75, TRUE);
|
||||
@ -320,6 +339,9 @@ jpeg_set_defaults (j_compress_ptr cinfo)
|
||||
/* By default, use the simpler non-cosited sampling alignment */
|
||||
cinfo->CCIR601_sampling = FALSE;
|
||||
|
||||
/* By default, apply fancy downsampling */
|
||||
cinfo->do_fancy_downsampling = TRUE;
|
||||
|
||||
/* No input smoothing */
|
||||
cinfo->smoothing_factor = 0;
|
||||
|
||||
|
833
jpeg/jcphuff.c
833
jpeg/jcphuff.c
@ -1,833 +0,0 @@
|
||||
/*
|
||||
* jcphuff.c
|
||||
*
|
||||
* Copyright (C) 1995-1997, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains Huffman entropy encoding routines for progressive JPEG.
|
||||
*
|
||||
* We do not support output suspension in this module, since the library
|
||||
* currently does not allow multiple-scan files to be written with output
|
||||
* suspension.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
#include "jchuff.h" /* Declarations shared with jchuff.c */
|
||||
|
||||
#ifdef C_PROGRESSIVE_SUPPORTED
|
||||
|
||||
/* Expanded entropy encoder object for progressive Huffman encoding. */
|
||||
|
||||
typedef struct {
|
||||
struct jpeg_entropy_encoder pub; /* public fields */
|
||||
|
||||
/* Mode flag: TRUE for optimization, FALSE for actual data output */
|
||||
boolean gather_statistics;
|
||||
|
||||
/* Bit-level coding status.
|
||||
* next_output_byte/free_in_buffer are local copies of cinfo->dest fields.
|
||||
*/
|
||||
JOCTET * next_output_byte; /* => next byte to write in buffer */
|
||||
size_t free_in_buffer; /* # of byte spaces remaining in buffer */
|
||||
INT32 put_buffer; /* current bit-accumulation buffer */
|
||||
int put_bits; /* # of bits now in it */
|
||||
j_compress_ptr cinfo; /* link to cinfo (needed for dump_buffer) */
|
||||
|
||||
/* Coding status for DC components */
|
||||
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
|
||||
|
||||
/* Coding status for AC components */
|
||||
int ac_tbl_no; /* the table number of the single component */
|
||||
unsigned int EOBRUN; /* run length of EOBs */
|
||||
unsigned int BE; /* # of buffered correction bits before MCU */
|
||||
char * bit_buffer; /* buffer for correction bits (1 per char) */
|
||||
/* packing correction bits tightly would save some space but cost time... */
|
||||
|
||||
unsigned int restarts_to_go; /* MCUs left in this restart interval */
|
||||
int next_restart_num; /* next restart number to write (0-7) */
|
||||
|
||||
/* Pointers to derived tables (these workspaces have image lifespan).
|
||||
* Since any one scan codes only DC or only AC, we only need one set
|
||||
* of tables, not one for DC and one for AC.
|
||||
*/
|
||||
c_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
|
||||
|
||||
/* Statistics tables for optimization; again, one set is enough */
|
||||
long * count_ptrs[NUM_HUFF_TBLS];
|
||||
} phuff_entropy_encoder;
|
||||
|
||||
typedef phuff_entropy_encoder * phuff_entropy_ptr;
|
||||
|
||||
/* MAX_CORR_BITS is the number of bits the AC refinement correction-bit
|
||||
* buffer can hold. Larger sizes may slightly improve compression, but
|
||||
* 1000 is already well into the realm of overkill.
|
||||
* The minimum safe size is 64 bits.
|
||||
*/
|
||||
|
||||
#define MAX_CORR_BITS 1000 /* Max # of correction bits I can buffer */
|
||||
|
||||
/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
|
||||
* We assume that int right shift is unsigned if INT32 right shift is,
|
||||
* which should be safe.
|
||||
*/
|
||||
|
||||
#ifdef RIGHT_SHIFT_IS_UNSIGNED
|
||||
#define ISHIFT_TEMPS int ishift_temp;
|
||||
#define IRIGHT_SHIFT(x,shft) \
|
||||
((ishift_temp = (x)) < 0 ? \
|
||||
(ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
|
||||
(ishift_temp >> (shft)))
|
||||
#else
|
||||
#define ISHIFT_TEMPS
|
||||
#define IRIGHT_SHIFT(x,shft) ((x) >> (shft))
|
||||
#endif
|
||||
|
||||
/* Forward declarations */
|
||||
METHODDEF(boolean) encode_mcu_DC_first JPP((j_compress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) encode_mcu_AC_first JPP((j_compress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) encode_mcu_DC_refine JPP((j_compress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) encode_mcu_AC_refine JPP((j_compress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(void) finish_pass_phuff JPP((j_compress_ptr cinfo));
|
||||
METHODDEF(void) finish_pass_gather_phuff JPP((j_compress_ptr cinfo));
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for a Huffman-compressed scan using progressive JPEG.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass_phuff (j_compress_ptr cinfo, boolean gather_statistics)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
boolean is_DC_band;
|
||||
int ci, tbl;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
entropy->cinfo = cinfo;
|
||||
entropy->gather_statistics = gather_statistics;
|
||||
|
||||
is_DC_band = (cinfo->Ss == 0);
|
||||
|
||||
/* We assume jcmaster.c already validated the scan parameters. */
|
||||
|
||||
/* Select execution routines */
|
||||
if (cinfo->Ah == 0) {
|
||||
if (is_DC_band)
|
||||
entropy->pub.encode_mcu = encode_mcu_DC_first;
|
||||
else
|
||||
entropy->pub.encode_mcu = encode_mcu_AC_first;
|
||||
} else {
|
||||
if (is_DC_band)
|
||||
entropy->pub.encode_mcu = encode_mcu_DC_refine;
|
||||
else {
|
||||
entropy->pub.encode_mcu = encode_mcu_AC_refine;
|
||||
/* AC refinement needs a correction bit buffer */
|
||||
if (entropy->bit_buffer == NULL)
|
||||
entropy->bit_buffer = (char *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
MAX_CORR_BITS * SIZEOF(char));
|
||||
}
|
||||
}
|
||||
if (gather_statistics)
|
||||
entropy->pub.finish_pass = finish_pass_gather_phuff;
|
||||
else
|
||||
entropy->pub.finish_pass = finish_pass_phuff;
|
||||
|
||||
/* Only DC coefficients may be interleaved, so cinfo->comps_in_scan = 1
|
||||
* for AC coefficients.
|
||||
*/
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
/* Initialize DC predictions to 0 */
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
/* Get table index */
|
||||
if (is_DC_band) {
|
||||
if (cinfo->Ah != 0) /* DC refinement needs no table */
|
||||
continue;
|
||||
tbl = compptr->dc_tbl_no;
|
||||
} else {
|
||||
entropy->ac_tbl_no = tbl = compptr->ac_tbl_no;
|
||||
}
|
||||
if (gather_statistics) {
|
||||
/* Check for invalid table index */
|
||||
/* (make_c_derived_tbl does this in the other path) */
|
||||
if (tbl < 0 || tbl >= NUM_HUFF_TBLS)
|
||||
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
|
||||
/* Allocate and zero the statistics tables */
|
||||
/* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
|
||||
if (entropy->count_ptrs[tbl] == NULL)
|
||||
entropy->count_ptrs[tbl] = (long *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
257 * SIZEOF(long));
|
||||
MEMZERO(entropy->count_ptrs[tbl], 257 * SIZEOF(long));
|
||||
} else {
|
||||
/* Compute derived values for Huffman table */
|
||||
/* We may do this more than once for a table, but it's not expensive */
|
||||
jpeg_make_c_derived_tbl(cinfo, is_DC_band, tbl,
|
||||
& entropy->derived_tbls[tbl]);
|
||||
}
|
||||
}
|
||||
|
||||
/* Initialize AC stuff */
|
||||
entropy->EOBRUN = 0;
|
||||
entropy->BE = 0;
|
||||
|
||||
/* Initialize bit buffer to empty */
|
||||
entropy->put_buffer = 0;
|
||||
entropy->put_bits = 0;
|
||||
|
||||
/* Initialize restart stuff */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num = 0;
|
||||
}
|
||||
|
||||
|
||||
/* Outputting bytes to the file.
|
||||
* NB: these must be called only when actually outputting,
|
||||
* that is, entropy->gather_statistics == FALSE.
|
||||
*/
|
||||
|
||||
/* Emit a byte */
|
||||
#define emit_byte(entropy,val) \
|
||||
{ *(entropy)->next_output_byte++ = (JOCTET) (val); \
|
||||
if (--(entropy)->free_in_buffer == 0) \
|
||||
dump_buffer(entropy); }
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
dump_buffer (phuff_entropy_ptr entropy)
|
||||
/* Empty the output buffer; we do not support suspension in this module. */
|
||||
{
|
||||
struct jpeg_destination_mgr * dest = entropy->cinfo->dest;
|
||||
|
||||
if (! (*dest->empty_output_buffer) (entropy->cinfo))
|
||||
ERREXIT(entropy->cinfo, JERR_CANT_SUSPEND);
|
||||
/* After a successful buffer dump, must reset buffer pointers */
|
||||
entropy->next_output_byte = dest->next_output_byte;
|
||||
entropy->free_in_buffer = dest->free_in_buffer;
|
||||
}
|
||||
|
||||
|
||||
/* Outputting bits to the file */
|
||||
|
||||
/* Only the right 24 bits of put_buffer are used; the valid bits are
|
||||
* left-justified in this part. At most 16 bits can be passed to emit_bits
|
||||
* in one call, and we never retain more than 7 bits in put_buffer
|
||||
* between calls, so 24 bits are sufficient.
|
||||
*/
|
||||
|
||||
INLINE
|
||||
LOCAL(void)
|
||||
emit_bits (phuff_entropy_ptr entropy, unsigned int code, int size)
|
||||
/* Emit some bits, unless we are in gather mode */
|
||||
{
|
||||
/* This routine is heavily used, so it's worth coding tightly. */
|
||||
register INT32 put_buffer = (INT32) code;
|
||||
register int put_bits = entropy->put_bits;
|
||||
|
||||
/* if size is 0, caller used an invalid Huffman table entry */
|
||||
if (size == 0)
|
||||
ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE);
|
||||
|
||||
if (entropy->gather_statistics)
|
||||
return; /* do nothing if we're only getting stats */
|
||||
|
||||
put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */
|
||||
|
||||
put_bits += size; /* new number of bits in buffer */
|
||||
|
||||
put_buffer <<= 24 - put_bits; /* align incoming bits */
|
||||
|
||||
put_buffer |= entropy->put_buffer; /* and merge with old buffer contents */
|
||||
|
||||
while (put_bits >= 8) {
|
||||
int c = (int) ((put_buffer >> 16) & 0xFF);
|
||||
|
||||
emit_byte(entropy, c);
|
||||
if (c == 0xFF) { /* need to stuff a zero byte? */
|
||||
emit_byte(entropy, 0);
|
||||
}
|
||||
put_buffer <<= 8;
|
||||
put_bits -= 8;
|
||||
}
|
||||
|
||||
entropy->put_buffer = put_buffer; /* update variables */
|
||||
entropy->put_bits = put_bits;
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
flush_bits (phuff_entropy_ptr entropy)
|
||||
{
|
||||
emit_bits(entropy, 0x7F, 7); /* fill any partial byte with ones */
|
||||
entropy->put_buffer = 0; /* and reset bit-buffer to empty */
|
||||
entropy->put_bits = 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Emit (or just count) a Huffman symbol.
|
||||
*/
|
||||
|
||||
INLINE
|
||||
LOCAL(void)
|
||||
emit_symbol (phuff_entropy_ptr entropy, int tbl_no, int symbol)
|
||||
{
|
||||
if (entropy->gather_statistics)
|
||||
entropy->count_ptrs[tbl_no][symbol]++;
|
||||
else {
|
||||
c_derived_tbl * tbl = entropy->derived_tbls[tbl_no];
|
||||
emit_bits(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Emit bits from a correction bit buffer.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
emit_buffered_bits (phuff_entropy_ptr entropy, char * bufstart,
|
||||
unsigned int nbits)
|
||||
{
|
||||
if (entropy->gather_statistics)
|
||||
return; /* no real work */
|
||||
|
||||
while (nbits > 0) {
|
||||
emit_bits(entropy, (unsigned int) (*bufstart), 1);
|
||||
bufstart++;
|
||||
nbits--;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Emit any pending EOBRUN symbol.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
emit_eobrun (phuff_entropy_ptr entropy)
|
||||
{
|
||||
register int temp, nbits;
|
||||
|
||||
if (entropy->EOBRUN > 0) { /* if there is any pending EOBRUN */
|
||||
temp = entropy->EOBRUN;
|
||||
nbits = 0;
|
||||
while ((temp >>= 1))
|
||||
nbits++;
|
||||
/* safety check: shouldn't happen given limited correction-bit buffer */
|
||||
if (nbits > 14)
|
||||
ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE);
|
||||
|
||||
emit_symbol(entropy, entropy->ac_tbl_no, nbits << 4);
|
||||
if (nbits)
|
||||
emit_bits(entropy, entropy->EOBRUN, nbits);
|
||||
|
||||
entropy->EOBRUN = 0;
|
||||
|
||||
/* Emit any buffered correction bits */
|
||||
emit_buffered_bits(entropy, entropy->bit_buffer, entropy->BE);
|
||||
entropy->BE = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Emit a restart marker & resynchronize predictions.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
emit_restart (phuff_entropy_ptr entropy, int restart_num)
|
||||
{
|
||||
int ci;
|
||||
|
||||
emit_eobrun(entropy);
|
||||
|
||||
if (! entropy->gather_statistics) {
|
||||
flush_bits(entropy);
|
||||
emit_byte(entropy, 0xFF);
|
||||
emit_byte(entropy, JPEG_RST0 + restart_num);
|
||||
}
|
||||
|
||||
if (entropy->cinfo->Ss == 0) {
|
||||
/* Re-initialize DC predictions to 0 */
|
||||
for (ci = 0; ci < entropy->cinfo->comps_in_scan; ci++)
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
} else {
|
||||
/* Re-initialize all AC-related fields to 0 */
|
||||
entropy->EOBRUN = 0;
|
||||
entropy->BE = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for DC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
register int temp, temp2;
|
||||
register int nbits;
|
||||
int blkn, ci;
|
||||
int Al = cinfo->Al;
|
||||
JBLOCKROW block;
|
||||
jpeg_component_info * compptr;
|
||||
ISHIFT_TEMPS
|
||||
|
||||
entropy->next_output_byte = cinfo->dest->next_output_byte;
|
||||
entropy->free_in_buffer = cinfo->dest->free_in_buffer;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval)
|
||||
if (entropy->restarts_to_go == 0)
|
||||
emit_restart(entropy, entropy->next_restart_num);
|
||||
|
||||
/* Encode the MCU data blocks */
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
|
||||
/* Compute the DC value after the required point transform by Al.
|
||||
* This is simply an arithmetic right shift.
|
||||
*/
|
||||
temp2 = IRIGHT_SHIFT((int) ((*block)[0]), Al);
|
||||
|
||||
/* DC differences are figured on the point-transformed values. */
|
||||
temp = temp2 - entropy->last_dc_val[ci];
|
||||
entropy->last_dc_val[ci] = temp2;
|
||||
|
||||
/* Encode the DC coefficient difference per section G.1.2.1 */
|
||||
temp2 = temp;
|
||||
if (temp < 0) {
|
||||
temp = -temp; /* temp is abs value of input */
|
||||
/* For a negative input, want temp2 = bitwise complement of abs(input) */
|
||||
/* This code assumes we are on a two's complement machine */
|
||||
temp2--;
|
||||
}
|
||||
|
||||
/* Find the number of bits needed for the magnitude of the coefficient */
|
||||
nbits = 0;
|
||||
while (temp) {
|
||||
nbits++;
|
||||
temp >>= 1;
|
||||
}
|
||||
/* Check for out-of-range coefficient values.
|
||||
* Since we're encoding a difference, the range limit is twice as much.
|
||||
*/
|
||||
if (nbits > MAX_COEF_BITS+1)
|
||||
ERREXIT(cinfo, JERR_BAD_DCT_COEF);
|
||||
|
||||
/* Count/emit the Huffman-coded symbol for the number of bits */
|
||||
emit_symbol(entropy, compptr->dc_tbl_no, nbits);
|
||||
|
||||
/* Emit that number of bits of the value, if positive, */
|
||||
/* or the complement of its magnitude, if negative. */
|
||||
if (nbits) /* emit_bits rejects calls with size 0 */
|
||||
emit_bits(entropy, (unsigned int) temp2, nbits);
|
||||
}
|
||||
|
||||
cinfo->dest->next_output_byte = entropy->next_output_byte;
|
||||
cinfo->dest->free_in_buffer = entropy->free_in_buffer;
|
||||
|
||||
/* Update restart-interval state too */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for AC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
register int temp, temp2;
|
||||
register int nbits;
|
||||
register int r, k;
|
||||
int Se = cinfo->Se;
|
||||
int Al = cinfo->Al;
|
||||
JBLOCKROW block;
|
||||
|
||||
entropy->next_output_byte = cinfo->dest->next_output_byte;
|
||||
entropy->free_in_buffer = cinfo->dest->free_in_buffer;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval)
|
||||
if (entropy->restarts_to_go == 0)
|
||||
emit_restart(entropy, entropy->next_restart_num);
|
||||
|
||||
/* Encode the MCU data block */
|
||||
block = MCU_data[0];
|
||||
|
||||
/* Encode the AC coefficients per section G.1.2.2, fig. G.3 */
|
||||
|
||||
r = 0; /* r = run length of zeros */
|
||||
|
||||
for (k = cinfo->Ss; k <= Se; k++) {
|
||||
if ((temp = (*block)[jpeg_natural_order[k]]) == 0) {
|
||||
r++;
|
||||
continue;
|
||||
}
|
||||
/* We must apply the point transform by Al. For AC coefficients this
|
||||
* is an integer division with rounding towards 0. To do this portably
|
||||
* in C, we shift after obtaining the absolute value; so the code is
|
||||
* interwoven with finding the abs value (temp) and output bits (temp2).
|
||||
*/
|
||||
if (temp < 0) {
|
||||
temp = -temp; /* temp is abs value of input */
|
||||
temp >>= Al; /* apply the point transform */
|
||||
/* For a negative coef, want temp2 = bitwise complement of abs(coef) */
|
||||
temp2 = ~temp;
|
||||
} else {
|
||||
temp >>= Al; /* apply the point transform */
|
||||
temp2 = temp;
|
||||
}
|
||||
/* Watch out for case that nonzero coef is zero after point transform */
|
||||
if (temp == 0) {
|
||||
r++;
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Emit any pending EOBRUN */
|
||||
if (entropy->EOBRUN > 0)
|
||||
emit_eobrun(entropy);
|
||||
/* if run length > 15, must emit special run-length-16 codes (0xF0) */
|
||||
while (r > 15) {
|
||||
emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
|
||||
r -= 16;
|
||||
}
|
||||
|
||||
/* Find the number of bits needed for the magnitude of the coefficient */
|
||||
nbits = 1; /* there must be at least one 1 bit */
|
||||
while ((temp >>= 1))
|
||||
nbits++;
|
||||
/* Check for out-of-range coefficient values */
|
||||
if (nbits > MAX_COEF_BITS)
|
||||
ERREXIT(cinfo, JERR_BAD_DCT_COEF);
|
||||
|
||||
/* Count/emit Huffman symbol for run length / number of bits */
|
||||
emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits);
|
||||
|
||||
/* Emit that number of bits of the value, if positive, */
|
||||
/* or the complement of its magnitude, if negative. */
|
||||
emit_bits(entropy, (unsigned int) temp2, nbits);
|
||||
|
||||
r = 0; /* reset zero run length */
|
||||
}
|
||||
|
||||
if (r > 0) { /* If there are trailing zeroes, */
|
||||
entropy->EOBRUN++; /* count an EOB */
|
||||
if (entropy->EOBRUN == 0x7FFF)
|
||||
emit_eobrun(entropy); /* force it out to avoid overflow */
|
||||
}
|
||||
|
||||
cinfo->dest->next_output_byte = entropy->next_output_byte;
|
||||
cinfo->dest->free_in_buffer = entropy->free_in_buffer;
|
||||
|
||||
/* Update restart-interval state too */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for DC successive approximation refinement scan.
|
||||
* Note: we assume such scans can be multi-component, although the spec
|
||||
* is not very clear on the point.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
register int temp;
|
||||
int blkn;
|
||||
int Al = cinfo->Al;
|
||||
JBLOCKROW block;
|
||||
|
||||
entropy->next_output_byte = cinfo->dest->next_output_byte;
|
||||
entropy->free_in_buffer = cinfo->dest->free_in_buffer;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval)
|
||||
if (entropy->restarts_to_go == 0)
|
||||
emit_restart(entropy, entropy->next_restart_num);
|
||||
|
||||
/* Encode the MCU data blocks */
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
|
||||
/* We simply emit the Al'th bit of the DC coefficient value. */
|
||||
temp = (*block)[0];
|
||||
emit_bits(entropy, (unsigned int) (temp >> Al), 1);
|
||||
}
|
||||
|
||||
cinfo->dest->next_output_byte = entropy->next_output_byte;
|
||||
cinfo->dest->free_in_buffer = entropy->free_in_buffer;
|
||||
|
||||
/* Update restart-interval state too */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU encoding for AC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
register int temp;
|
||||
register int r, k;
|
||||
int EOB;
|
||||
char *BR_buffer;
|
||||
unsigned int BR;
|
||||
int Se = cinfo->Se;
|
||||
int Al = cinfo->Al;
|
||||
JBLOCKROW block;
|
||||
int absvalues[DCTSIZE2];
|
||||
|
||||
entropy->next_output_byte = cinfo->dest->next_output_byte;
|
||||
entropy->free_in_buffer = cinfo->dest->free_in_buffer;
|
||||
|
||||
/* Emit restart marker if needed */
|
||||
if (cinfo->restart_interval)
|
||||
if (entropy->restarts_to_go == 0)
|
||||
emit_restart(entropy, entropy->next_restart_num);
|
||||
|
||||
/* Encode the MCU data block */
|
||||
block = MCU_data[0];
|
||||
|
||||
/* It is convenient to make a pre-pass to determine the transformed
|
||||
* coefficients' absolute values and the EOB position.
|
||||
*/
|
||||
EOB = 0;
|
||||
for (k = cinfo->Ss; k <= Se; k++) {
|
||||
temp = (*block)[jpeg_natural_order[k]];
|
||||
/* We must apply the point transform by Al. For AC coefficients this
|
||||
* is an integer division with rounding towards 0. To do this portably
|
||||
* in C, we shift after obtaining the absolute value.
|
||||
*/
|
||||
if (temp < 0)
|
||||
temp = -temp; /* temp is abs value of input */
|
||||
temp >>= Al; /* apply the point transform */
|
||||
absvalues[k] = temp; /* save abs value for main pass */
|
||||
if (temp == 1)
|
||||
EOB = k; /* EOB = index of last newly-nonzero coef */
|
||||
}
|
||||
|
||||
/* Encode the AC coefficients per section G.1.2.3, fig. G.7 */
|
||||
|
||||
r = 0; /* r = run length of zeros */
|
||||
BR = 0; /* BR = count of buffered bits added now */
|
||||
BR_buffer = entropy->bit_buffer + entropy->BE; /* Append bits to buffer */
|
||||
|
||||
for (k = cinfo->Ss; k <= Se; k++) {
|
||||
if ((temp = absvalues[k]) == 0) {
|
||||
r++;
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Emit any required ZRLs, but not if they can be folded into EOB */
|
||||
while (r > 15 && k <= EOB) {
|
||||
/* emit any pending EOBRUN and the BE correction bits */
|
||||
emit_eobrun(entropy);
|
||||
/* Emit ZRL */
|
||||
emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
|
||||
r -= 16;
|
||||
/* Emit buffered correction bits that must be associated with ZRL */
|
||||
emit_buffered_bits(entropy, BR_buffer, BR);
|
||||
BR_buffer = entropy->bit_buffer; /* BE bits are gone now */
|
||||
BR = 0;
|
||||
}
|
||||
|
||||
/* If the coef was previously nonzero, it only needs a correction bit.
|
||||
* NOTE: a straight translation of the spec's figure G.7 would suggest
|
||||
* that we also need to test r > 15. But if r > 15, we can only get here
|
||||
* if k > EOB, which implies that this coefficient is not 1.
|
||||
*/
|
||||
if (temp > 1) {
|
||||
/* The correction bit is the next bit of the absolute value. */
|
||||
BR_buffer[BR++] = (char) (temp & 1);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Emit any pending EOBRUN and the BE correction bits */
|
||||
emit_eobrun(entropy);
|
||||
|
||||
/* Count/emit Huffman symbol for run length / number of bits */
|
||||
emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1);
|
||||
|
||||
/* Emit output bit for newly-nonzero coef */
|
||||
temp = ((*block)[jpeg_natural_order[k]] < 0) ? 0 : 1;
|
||||
emit_bits(entropy, (unsigned int) temp, 1);
|
||||
|
||||
/* Emit buffered correction bits that must be associated with this code */
|
||||
emit_buffered_bits(entropy, BR_buffer, BR);
|
||||
BR_buffer = entropy->bit_buffer; /* BE bits are gone now */
|
||||
BR = 0;
|
||||
r = 0; /* reset zero run length */
|
||||
}
|
||||
|
||||
if (r > 0 || BR > 0) { /* If there are trailing zeroes, */
|
||||
entropy->EOBRUN++; /* count an EOB */
|
||||
entropy->BE += BR; /* concat my correction bits to older ones */
|
||||
/* We force out the EOB if we risk either:
|
||||
* 1. overflow of the EOB counter;
|
||||
* 2. overflow of the correction bit buffer during the next MCU.
|
||||
*/
|
||||
if (entropy->EOBRUN == 0x7FFF || entropy->BE > (MAX_CORR_BITS-DCTSIZE2+1))
|
||||
emit_eobrun(entropy);
|
||||
}
|
||||
|
||||
cinfo->dest->next_output_byte = entropy->next_output_byte;
|
||||
cinfo->dest->free_in_buffer = entropy->free_in_buffer;
|
||||
|
||||
/* Update restart-interval state too */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0) {
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
entropy->next_restart_num++;
|
||||
entropy->next_restart_num &= 7;
|
||||
}
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Finish up at the end of a Huffman-compressed progressive scan.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
finish_pass_phuff (j_compress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
|
||||
entropy->next_output_byte = cinfo->dest->next_output_byte;
|
||||
entropy->free_in_buffer = cinfo->dest->free_in_buffer;
|
||||
|
||||
/* Flush out any buffered data */
|
||||
emit_eobrun(entropy);
|
||||
flush_bits(entropy);
|
||||
|
||||
cinfo->dest->next_output_byte = entropy->next_output_byte;
|
||||
cinfo->dest->free_in_buffer = entropy->free_in_buffer;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Finish up a statistics-gathering pass and create the new Huffman tables.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
finish_pass_gather_phuff (j_compress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
boolean is_DC_band;
|
||||
int ci, tbl;
|
||||
jpeg_component_info * compptr;
|
||||
JHUFF_TBL **htblptr;
|
||||
boolean did[NUM_HUFF_TBLS];
|
||||
|
||||
/* Flush out buffered data (all we care about is counting the EOB symbol) */
|
||||
emit_eobrun(entropy);
|
||||
|
||||
is_DC_band = (cinfo->Ss == 0);
|
||||
|
||||
/* It's important not to apply jpeg_gen_optimal_table more than once
|
||||
* per table, because it clobbers the input frequency counts!
|
||||
*/
|
||||
MEMZERO(did, SIZEOF(did));
|
||||
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
if (is_DC_band) {
|
||||
if (cinfo->Ah != 0) /* DC refinement needs no table */
|
||||
continue;
|
||||
tbl = compptr->dc_tbl_no;
|
||||
} else {
|
||||
tbl = compptr->ac_tbl_no;
|
||||
}
|
||||
if (! did[tbl]) {
|
||||
if (is_DC_band)
|
||||
htblptr = & cinfo->dc_huff_tbl_ptrs[tbl];
|
||||
else
|
||||
htblptr = & cinfo->ac_huff_tbl_ptrs[tbl];
|
||||
if (*htblptr == NULL)
|
||||
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
|
||||
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->count_ptrs[tbl]);
|
||||
did[tbl] = TRUE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Module initialization routine for progressive Huffman entropy encoding.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jinit_phuff_encoder (j_compress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy;
|
||||
int i;
|
||||
|
||||
entropy = (phuff_entropy_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(phuff_entropy_encoder));
|
||||
cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
|
||||
entropy->pub.start_pass = start_pass_phuff;
|
||||
|
||||
/* Mark tables unallocated */
|
||||
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
||||
entropy->derived_tbls[i] = NULL;
|
||||
entropy->count_ptrs[i] = NULL;
|
||||
}
|
||||
entropy->bit_buffer = NULL; /* needed only in AC refinement scan */
|
||||
}
|
||||
|
||||
#endif /* C_PROGRESSIVE_SUPPORTED */
|
@ -173,10 +173,12 @@ pre_process_data (j_compress_ptr cinfo,
|
||||
*out_row_group_ctr < out_row_groups_avail) {
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
numrows = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size;
|
||||
expand_bottom_edge(output_buf[ci],
|
||||
compptr->width_in_blocks * DCTSIZE,
|
||||
(int) (*out_row_group_ctr * compptr->v_samp_factor),
|
||||
(int) (out_row_groups_avail * compptr->v_samp_factor));
|
||||
compptr->width_in_blocks * compptr->DCT_h_scaled_size,
|
||||
(int) (*out_row_group_ctr * numrows),
|
||||
(int) (out_row_groups_avail * numrows));
|
||||
}
|
||||
*out_row_group_ctr = out_row_groups_avail;
|
||||
break; /* can exit outer loop without test */
|
||||
@ -288,7 +290,8 @@ create_context_buffer (j_compress_ptr cinfo)
|
||||
*/
|
||||
true_buffer = (*cinfo->mem->alloc_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
(JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
|
||||
(JDIMENSION) (((long) compptr->width_in_blocks *
|
||||
cinfo->min_DCT_h_scaled_size *
|
||||
cinfo->max_h_samp_factor) / compptr->h_samp_factor),
|
||||
(JDIMENSION) (3 * rgroup_height));
|
||||
/* Copy true buffer row pointers into the middle of the fake row array */
|
||||
@ -346,7 +349,8 @@ jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)
|
||||
ci++, compptr++) {
|
||||
prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
(JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
|
||||
(JDIMENSION) (((long) compptr->width_in_blocks *
|
||||
cinfo->min_DCT_h_scaled_size *
|
||||
cinfo->max_h_samp_factor) / compptr->h_samp_factor),
|
||||
(JDIMENSION) cinfo->max_v_samp_factor);
|
||||
}
|
||||
|
@ -62,6 +62,15 @@ typedef struct {
|
||||
|
||||
/* Downsampling method pointers, one per component */
|
||||
downsample1_ptr methods[MAX_COMPONENTS];
|
||||
|
||||
/* Height of an output row group for each component. */
|
||||
int rowgroup_height[MAX_COMPONENTS];
|
||||
|
||||
/* These arrays save pixel expansion factors so that int_downsample need not
|
||||
* recompute them each time. They are unused for other downsampling methods.
|
||||
*/
|
||||
UINT8 h_expand[MAX_COMPONENTS];
|
||||
UINT8 v_expand[MAX_COMPONENTS];
|
||||
} my_downsampler;
|
||||
|
||||
typedef my_downsampler * my_downsample_ptr;
|
||||
@ -123,7 +132,8 @@ sep_downsample (j_compress_ptr cinfo,
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
in_ptr = input_buf[ci] + in_row_index;
|
||||
out_ptr = output_buf[ci] + (out_row_group_index * compptr->v_samp_factor);
|
||||
out_ptr = output_buf[ci] +
|
||||
(out_row_group_index * downsample->rowgroup_height[ci]);
|
||||
(*downsample->methods[ci]) (cinfo, compptr, in_ptr, out_ptr);
|
||||
}
|
||||
}
|
||||
@ -140,14 +150,15 @@ METHODDEF(void)
|
||||
int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JSAMPARRAY input_data, JSAMPARRAY output_data)
|
||||
{
|
||||
my_downsample_ptr downsample = (my_downsample_ptr) cinfo->downsample;
|
||||
int inrow, outrow, h_expand, v_expand, numpix, numpix2, h, v;
|
||||
JDIMENSION outcol, outcol_h; /* outcol_h == outcol*h_expand */
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * compptr->DCT_h_scaled_size;
|
||||
JSAMPROW inptr, outptr;
|
||||
INT32 outvalue;
|
||||
|
||||
h_expand = cinfo->max_h_samp_factor / compptr->h_samp_factor;
|
||||
v_expand = cinfo->max_v_samp_factor / compptr->v_samp_factor;
|
||||
h_expand = downsample->h_expand[compptr->component_index];
|
||||
v_expand = downsample->v_expand[compptr->component_index];
|
||||
numpix = h_expand * v_expand;
|
||||
numpix2 = numpix/2;
|
||||
|
||||
@ -158,8 +169,8 @@ int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
expand_right_edge(input_data, cinfo->max_v_samp_factor,
|
||||
cinfo->image_width, output_cols * h_expand);
|
||||
|
||||
inrow = 0;
|
||||
for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
|
||||
inrow = outrow = 0;
|
||||
while (inrow < cinfo->max_v_samp_factor) {
|
||||
outptr = output_data[outrow];
|
||||
for (outcol = 0, outcol_h = 0; outcol < output_cols;
|
||||
outcol++, outcol_h += h_expand) {
|
||||
@ -173,6 +184,7 @@ int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
*outptr++ = (JSAMPLE) ((outvalue + numpix2) / numpix);
|
||||
}
|
||||
inrow += v_expand;
|
||||
outrow++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -191,8 +203,8 @@ fullsize_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
jcopy_sample_rows(input_data, 0, output_data, 0,
|
||||
cinfo->max_v_samp_factor, cinfo->image_width);
|
||||
/* Edge-expand */
|
||||
expand_right_edge(output_data, cinfo->max_v_samp_factor,
|
||||
cinfo->image_width, compptr->width_in_blocks * DCTSIZE);
|
||||
expand_right_edge(output_data, cinfo->max_v_samp_factor, cinfo->image_width,
|
||||
compptr->width_in_blocks * compptr->DCT_h_scaled_size);
|
||||
}
|
||||
|
||||
|
||||
@ -212,9 +224,9 @@ METHODDEF(void)
|
||||
h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JSAMPARRAY input_data, JSAMPARRAY output_data)
|
||||
{
|
||||
int outrow;
|
||||
int inrow;
|
||||
JDIMENSION outcol;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * compptr->DCT_h_scaled_size;
|
||||
register JSAMPROW inptr, outptr;
|
||||
register int bias;
|
||||
|
||||
@ -225,9 +237,9 @@ h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
expand_right_edge(input_data, cinfo->max_v_samp_factor,
|
||||
cinfo->image_width, output_cols * 2);
|
||||
|
||||
for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
|
||||
outptr = output_data[outrow];
|
||||
inptr = input_data[outrow];
|
||||
for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
|
||||
outptr = output_data[inrow];
|
||||
inptr = input_data[inrow];
|
||||
bias = 0; /* bias = 0,1,0,1,... for successive samples */
|
||||
for (outcol = 0; outcol < output_cols; outcol++) {
|
||||
*outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr) + GETJSAMPLE(inptr[1])
|
||||
@ -251,7 +263,7 @@ h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
{
|
||||
int inrow, outrow;
|
||||
JDIMENSION outcol;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * compptr->DCT_h_scaled_size;
|
||||
register JSAMPROW inptr0, inptr1, outptr;
|
||||
register int bias;
|
||||
|
||||
@ -262,8 +274,8 @@ h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
expand_right_edge(input_data, cinfo->max_v_samp_factor,
|
||||
cinfo->image_width, output_cols * 2);
|
||||
|
||||
inrow = 0;
|
||||
for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
|
||||
inrow = outrow = 0;
|
||||
while (inrow < cinfo->max_v_samp_factor) {
|
||||
outptr = output_data[outrow];
|
||||
inptr0 = input_data[inrow];
|
||||
inptr1 = input_data[inrow+1];
|
||||
@ -276,6 +288,7 @@ h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
inptr0 += 2; inptr1 += 2;
|
||||
}
|
||||
inrow += 2;
|
||||
outrow++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -294,7 +307,7 @@ h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
{
|
||||
int inrow, outrow;
|
||||
JDIMENSION colctr;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * compptr->DCT_h_scaled_size;
|
||||
register JSAMPROW inptr0, inptr1, above_ptr, below_ptr, outptr;
|
||||
INT32 membersum, neighsum, memberscale, neighscale;
|
||||
|
||||
@ -321,8 +334,8 @@ h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
memberscale = 16384 - cinfo->smoothing_factor * 80; /* scaled (1-5*SF)/4 */
|
||||
neighscale = cinfo->smoothing_factor * 16; /* scaled SF/4 */
|
||||
|
||||
inrow = 0;
|
||||
for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
|
||||
inrow = outrow = 0;
|
||||
while (inrow < cinfo->max_v_samp_factor) {
|
||||
outptr = output_data[outrow];
|
||||
inptr0 = input_data[inrow];
|
||||
inptr1 = input_data[inrow+1];
|
||||
@ -378,6 +391,7 @@ h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
*outptr = (JSAMPLE) ((membersum + 32768) >> 16);
|
||||
|
||||
inrow += 2;
|
||||
outrow++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -392,9 +406,9 @@ METHODDEF(void)
|
||||
fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
|
||||
JSAMPARRAY input_data, JSAMPARRAY output_data)
|
||||
{
|
||||
int outrow;
|
||||
int inrow;
|
||||
JDIMENSION colctr;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
|
||||
JDIMENSION output_cols = compptr->width_in_blocks * compptr->DCT_h_scaled_size;
|
||||
register JSAMPROW inptr, above_ptr, below_ptr, outptr;
|
||||
INT32 membersum, neighsum, memberscale, neighscale;
|
||||
int colsum, lastcolsum, nextcolsum;
|
||||
@ -415,11 +429,11 @@ fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
|
||||
memberscale = 65536L - cinfo->smoothing_factor * 512L; /* scaled 1-8*SF */
|
||||
neighscale = cinfo->smoothing_factor * 64; /* scaled SF */
|
||||
|
||||
for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
|
||||
outptr = output_data[outrow];
|
||||
inptr = input_data[outrow];
|
||||
above_ptr = input_data[outrow-1];
|
||||
below_ptr = input_data[outrow+1];
|
||||
for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
|
||||
outptr = output_data[inrow];
|
||||
inptr = input_data[inrow];
|
||||
above_ptr = input_data[inrow-1];
|
||||
below_ptr = input_data[inrow+1];
|
||||
|
||||
/* Special case for first column */
|
||||
colsum = GETJSAMPLE(*above_ptr++) + GETJSAMPLE(*below_ptr++) +
|
||||
@ -467,6 +481,7 @@ jinit_downsampler (j_compress_ptr cinfo)
|
||||
int ci;
|
||||
jpeg_component_info * compptr;
|
||||
boolean smoothok = TRUE;
|
||||
int h_in_group, v_in_group, h_out_group, v_out_group;
|
||||
|
||||
downsample = (my_downsample_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
@ -482,8 +497,17 @@ jinit_downsampler (j_compress_ptr cinfo)
|
||||
/* Verify we can handle the sampling factors, and set up method pointers */
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
if (compptr->h_samp_factor == cinfo->max_h_samp_factor &&
|
||||
compptr->v_samp_factor == cinfo->max_v_samp_factor) {
|
||||
/* Compute size of an "output group" for DCT scaling. This many samples
|
||||
* are to be converted from max_h_samp_factor * max_v_samp_factor pixels.
|
||||
*/
|
||||
h_out_group = (compptr->h_samp_factor * compptr->DCT_h_scaled_size) /
|
||||
cinfo->min_DCT_h_scaled_size;
|
||||
v_out_group = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size;
|
||||
h_in_group = cinfo->max_h_samp_factor;
|
||||
v_in_group = cinfo->max_v_samp_factor;
|
||||
downsample->rowgroup_height[ci] = v_out_group; /* save for use later */
|
||||
if (h_in_group == h_out_group && v_in_group == v_out_group) {
|
||||
#ifdef INPUT_SMOOTHING_SUPPORTED
|
||||
if (cinfo->smoothing_factor) {
|
||||
downsample->methods[ci] = fullsize_smooth_downsample;
|
||||
@ -491,12 +515,12 @@ jinit_downsampler (j_compress_ptr cinfo)
|
||||
} else
|
||||
#endif
|
||||
downsample->methods[ci] = fullsize_downsample;
|
||||
} else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
|
||||
compptr->v_samp_factor == cinfo->max_v_samp_factor) {
|
||||
} else if (h_in_group == h_out_group * 2 &&
|
||||
v_in_group == v_out_group) {
|
||||
smoothok = FALSE;
|
||||
downsample->methods[ci] = h2v1_downsample;
|
||||
} else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
|
||||
compptr->v_samp_factor * 2 == cinfo->max_v_samp_factor) {
|
||||
} else if (h_in_group == h_out_group * 2 &&
|
||||
v_in_group == v_out_group * 2) {
|
||||
#ifdef INPUT_SMOOTHING_SUPPORTED
|
||||
if (cinfo->smoothing_factor) {
|
||||
downsample->methods[ci] = h2v2_smooth_downsample;
|
||||
@ -504,10 +528,12 @@ jinit_downsampler (j_compress_ptr cinfo)
|
||||
} else
|
||||
#endif
|
||||
downsample->methods[ci] = h2v2_downsample;
|
||||
} else if ((cinfo->max_h_samp_factor % compptr->h_samp_factor) == 0 &&
|
||||
(cinfo->max_v_samp_factor % compptr->v_samp_factor) == 0) {
|
||||
} else if ((h_in_group % h_out_group) == 0 &&
|
||||
(v_in_group % v_out_group) == 0) {
|
||||
smoothok = FALSE;
|
||||
downsample->methods[ci] = int_downsample;
|
||||
downsample->h_expand[ci] = (UINT8) (h_in_group / h_out_group);
|
||||
downsample->v_expand[ci] = (UINT8) (v_in_group / v_out_group);
|
||||
} else
|
||||
ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
|
||||
}
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jctrans.c
|
||||
*
|
||||
* Copyright (C) 1995-1998, Thomas G. Lane.
|
||||
* Modified 2000-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -76,6 +77,10 @@ jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
|
||||
dstinfo->image_height = srcinfo->image_height;
|
||||
dstinfo->input_components = srcinfo->num_components;
|
||||
dstinfo->in_color_space = srcinfo->jpeg_color_space;
|
||||
dstinfo->jpeg_width = srcinfo->output_width;
|
||||
dstinfo->jpeg_height = srcinfo->output_height;
|
||||
dstinfo->min_DCT_h_scaled_size = srcinfo->min_DCT_h_scaled_size;
|
||||
dstinfo->min_DCT_v_scaled_size = srcinfo->min_DCT_v_scaled_size;
|
||||
/* Initialize all parameters to default values */
|
||||
jpeg_set_defaults(dstinfo);
|
||||
/* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
|
||||
@ -158,25 +163,14 @@ LOCAL(void)
|
||||
transencode_master_selection (j_compress_ptr cinfo,
|
||||
jvirt_barray_ptr * coef_arrays)
|
||||
{
|
||||
/* Although we don't actually use input_components for transcoding,
|
||||
* jcmaster.c's initial_setup will complain if input_components is 0.
|
||||
*/
|
||||
cinfo->input_components = 1;
|
||||
/* Initialize master control (includes parameter checking/processing) */
|
||||
jinit_c_master_control(cinfo, TRUE /* transcode only */);
|
||||
|
||||
/* Entropy encoding: either Huffman or arithmetic coding. */
|
||||
if (cinfo->arith_code) {
|
||||
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
|
||||
} else {
|
||||
if (cinfo->progressive_mode) {
|
||||
#ifdef C_PROGRESSIVE_SUPPORTED
|
||||
jinit_phuff_encoder(cinfo);
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
#endif
|
||||
} else
|
||||
jinit_huff_encoder(cinfo);
|
||||
if (cinfo->arith_code)
|
||||
jinit_arith_encoder(cinfo);
|
||||
else {
|
||||
jinit_huff_encoder(cinfo);
|
||||
}
|
||||
|
||||
/* We need a special coefficient buffer controller. */
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jdapimin.c
|
||||
*
|
||||
* Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
* Modified 2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -185,8 +186,8 @@ default_decompress_parms (j_decompress_ptr cinfo)
|
||||
}
|
||||
|
||||
/* Set defaults for other decompression parameters. */
|
||||
cinfo->scale_num = 1; /* 1:1 scaling */
|
||||
cinfo->scale_denom = 1;
|
||||
cinfo->scale_num = cinfo->block_size; /* 1:1 scaling */
|
||||
cinfo->scale_denom = cinfo->block_size;
|
||||
cinfo->output_gamma = 1.0;
|
||||
cinfo->buffered_image = FALSE;
|
||||
cinfo->raw_data_out = FALSE;
|
||||
|
@ -202,7 +202,7 @@ jpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data,
|
||||
}
|
||||
|
||||
/* Verify that at least one iMCU row can be returned. */
|
||||
lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size;
|
||||
lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_v_scaled_size;
|
||||
if (max_lines < lines_per_iMCU_row)
|
||||
ERREXIT(cinfo, JERR_BUFFER_SIZE);
|
||||
|
||||
|
772
jpeg/jdarith.c
Normal file
772
jpeg/jdarith.c
Normal file
@ -0,0 +1,772 @@
|
||||
/*
|
||||
* jdarith.c
|
||||
*
|
||||
* Developed 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains portable arithmetic entropy decoding routines for JPEG
|
||||
* (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
|
||||
*
|
||||
* Both sequential and progressive modes are supported in this single module.
|
||||
*
|
||||
* Suspension is not currently supported in this module.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
|
||||
|
||||
/* Expanded entropy decoder object for arithmetic decoding. */
|
||||
|
||||
typedef struct {
|
||||
struct jpeg_entropy_decoder pub; /* public fields */
|
||||
|
||||
INT32 c; /* C register, base of coding interval + input bit buffer */
|
||||
INT32 a; /* A register, normalized size of coding interval */
|
||||
int ct; /* bit shift counter, # of bits left in bit buffer part of C */
|
||||
/* init: ct = -16 */
|
||||
/* run: ct = 0..7 */
|
||||
/* error: ct = -1 */
|
||||
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
|
||||
int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
|
||||
|
||||
unsigned int restarts_to_go; /* MCUs left in this restart interval */
|
||||
|
||||
/* Pointers to statistics areas (these workspaces have image lifespan) */
|
||||
unsigned char * dc_stats[NUM_ARITH_TBLS];
|
||||
unsigned char * ac_stats[NUM_ARITH_TBLS];
|
||||
|
||||
/* Statistics bin for coding with fixed probability 0.5 */
|
||||
unsigned char fixed_bin[4];
|
||||
} arith_entropy_decoder;
|
||||
|
||||
typedef arith_entropy_decoder * arith_entropy_ptr;
|
||||
|
||||
/* The following two definitions specify the allocation chunk size
|
||||
* for the statistics area.
|
||||
* According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
|
||||
* 49 statistics bins for DC, and 245 statistics bins for AC coding.
|
||||
*
|
||||
* We use a compact representation with 1 byte per statistics bin,
|
||||
* thus the numbers directly represent byte sizes.
|
||||
* This 1 byte per statistics bin contains the meaning of the MPS
|
||||
* (more probable symbol) in the highest bit (mask 0x80), and the
|
||||
* index into the probability estimation state machine table
|
||||
* in the lower bits (mask 0x7F).
|
||||
*/
|
||||
|
||||
#define DC_STAT_BINS 64
|
||||
#define AC_STAT_BINS 256
|
||||
|
||||
|
||||
LOCAL(int)
|
||||
get_byte (j_decompress_ptr cinfo)
|
||||
/* Read next input byte; we do not support suspension in this module. */
|
||||
{
|
||||
struct jpeg_source_mgr * src = cinfo->src;
|
||||
|
||||
if (src->bytes_in_buffer == 0)
|
||||
if (! (*src->fill_input_buffer) (cinfo))
|
||||
ERREXIT(cinfo, JERR_CANT_SUSPEND);
|
||||
src->bytes_in_buffer--;
|
||||
return GETJOCTET(*src->next_input_byte++);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* The core arithmetic decoding routine (common in JPEG and JBIG).
|
||||
* This needs to go as fast as possible.
|
||||
* Machine-dependent optimization facilities
|
||||
* are not utilized in this portable implementation.
|
||||
* However, this code should be fairly efficient and
|
||||
* may be a good base for further optimizations anyway.
|
||||
*
|
||||
* Return value is 0 or 1 (binary decision).
|
||||
*
|
||||
* Note: I've changed the handling of the code base & bit
|
||||
* buffer register C compared to other implementations
|
||||
* based on the standards layout & procedures.
|
||||
* While it also contains both the actual base of the
|
||||
* coding interval (16 bits) and the next-bits buffer,
|
||||
* the cut-point between these two parts is floating
|
||||
* (instead of fixed) with the bit shift counter CT.
|
||||
* Thus, we also need only one (variable instead of
|
||||
* fixed size) shift for the LPS/MPS decision, and
|
||||
* we can get away with any renormalization update
|
||||
* of C (except for new data insertion, of course).
|
||||
*
|
||||
* I've also introduced a new scheme for accessing
|
||||
* the probability estimation state machine table,
|
||||
* derived from Markus Kuhn's JBIG implementation.
|
||||
*/
|
||||
|
||||
LOCAL(int)
|
||||
arith_decode (j_decompress_ptr cinfo, unsigned char *st)
|
||||
{
|
||||
register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
|
||||
register unsigned char nl, nm;
|
||||
register INT32 qe, temp;
|
||||
register int sv, data;
|
||||
|
||||
/* Renormalization & data input per section D.2.6 */
|
||||
while (e->a < 0x8000L) {
|
||||
if (--e->ct < 0) {
|
||||
/* Need to fetch next data byte */
|
||||
if (cinfo->unread_marker)
|
||||
data = 0; /* stuff zero data */
|
||||
else {
|
||||
data = get_byte(cinfo); /* read next input byte */
|
||||
if (data == 0xFF) { /* zero stuff or marker code */
|
||||
do data = get_byte(cinfo);
|
||||
while (data == 0xFF); /* swallow extra 0xFF bytes */
|
||||
if (data == 0)
|
||||
data = 0xFF; /* discard stuffed zero byte */
|
||||
else {
|
||||
/* Note: Different from the Huffman decoder, hitting
|
||||
* a marker while processing the compressed data
|
||||
* segment is legal in arithmetic coding.
|
||||
* The convention is to supply zero data
|
||||
* then until decoding is complete.
|
||||
*/
|
||||
cinfo->unread_marker = data;
|
||||
data = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
e->c = (e->c << 8) | data; /* insert data into C register */
|
||||
if ((e->ct += 8) < 0) /* update bit shift counter */
|
||||
/* Need more initial bytes */
|
||||
if (++e->ct == 0)
|
||||
/* Got 2 initial bytes -> re-init A and exit loop */
|
||||
e->a = 0x8000L; /* => e->a = 0x10000L after loop exit */
|
||||
}
|
||||
e->a <<= 1;
|
||||
}
|
||||
|
||||
/* Fetch values from our compact representation of Table D.2:
|
||||
* Qe values and probability estimation state machine
|
||||
*/
|
||||
sv = *st;
|
||||
qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
|
||||
nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
|
||||
nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
|
||||
|
||||
/* Decode & estimation procedures per sections D.2.4 & D.2.5 */
|
||||
temp = e->a - qe;
|
||||
e->a = temp;
|
||||
temp <<= e->ct;
|
||||
if (e->c >= temp) {
|
||||
e->c -= temp;
|
||||
/* Conditional LPS (less probable symbol) exchange */
|
||||
if (e->a < qe) {
|
||||
e->a = qe;
|
||||
*st = (sv & 0x80) ^ nm; /* Estimate_after_MPS */
|
||||
} else {
|
||||
e->a = qe;
|
||||
*st = (sv & 0x80) ^ nl; /* Estimate_after_LPS */
|
||||
sv ^= 0x80; /* Exchange LPS/MPS */
|
||||
}
|
||||
} else if (e->a < 0x8000L) {
|
||||
/* Conditional MPS (more probable symbol) exchange */
|
||||
if (e->a < qe) {
|
||||
*st = (sv & 0x80) ^ nl; /* Estimate_after_LPS */
|
||||
sv ^= 0x80; /* Exchange LPS/MPS */
|
||||
} else {
|
||||
*st = (sv & 0x80) ^ nm; /* Estimate_after_MPS */
|
||||
}
|
||||
}
|
||||
|
||||
return sv >> 7;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Check for a restart marker & resynchronize decoder.
|
||||
*/
|
||||
|
||||
LOCAL(void)
|
||||
process_restart (j_decompress_ptr cinfo)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
int ci;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
/* Advance past the RSTn marker */
|
||||
if (! (*cinfo->marker->read_restart_marker) (cinfo))
|
||||
ERREXIT(cinfo, JERR_CANT_SUSPEND);
|
||||
|
||||
/* Re-initialize statistics areas */
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
|
||||
MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
|
||||
/* Reset DC predictions to 0 */
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
entropy->dc_context[ci] = 0;
|
||||
}
|
||||
if ((! cinfo->progressive_mode && cinfo->lim_Se) ||
|
||||
(cinfo->progressive_mode && cinfo->Ss)) {
|
||||
MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
|
||||
}
|
||||
}
|
||||
|
||||
/* Reset arithmetic decoding variables */
|
||||
entropy->c = 0;
|
||||
entropy->a = 0;
|
||||
entropy->ct = -16; /* force reading 2 initial bytes to fill C */
|
||||
|
||||
/* Reset restart counter */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Arithmetic MCU decoding.
|
||||
* Each of these routines decodes and returns one MCU's worth of
|
||||
* arithmetic-compressed coefficients.
|
||||
* The coefficients are reordered from zigzag order into natural array order,
|
||||
* but are not dequantized.
|
||||
*
|
||||
* The i'th block of the MCU is stored into the block pointed to by
|
||||
* MCU_data[i]. WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
|
||||
*/
|
||||
|
||||
/*
|
||||
* MCU decoding for DC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int blkn, ci, tbl, sign;
|
||||
int v, m;
|
||||
|
||||
/* Process restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
process_restart(cinfo);
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
if (entropy->ct == -1) return TRUE; /* if error do nothing */
|
||||
|
||||
/* Outer loop handles each block in the MCU */
|
||||
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
|
||||
|
||||
/* Sections F.2.4.1 & F.1.4.4.1: Decoding of DC coefficients */
|
||||
|
||||
/* Table F.4: Point to statistics bin S0 for DC coefficient coding */
|
||||
st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
|
||||
|
||||
/* Figure F.19: Decode_DC_DIFF */
|
||||
if (arith_decode(cinfo, st) == 0)
|
||||
entropy->dc_context[ci] = 0;
|
||||
else {
|
||||
/* Figure F.21: Decoding nonzero value v */
|
||||
/* Figure F.22: Decoding the sign of v */
|
||||
sign = arith_decode(cinfo, st + 1);
|
||||
st += 2; st += sign;
|
||||
/* Figure F.23: Decoding the magnitude category of v */
|
||||
if ((m = arith_decode(cinfo, st)) != 0) {
|
||||
st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
|
||||
while (arith_decode(cinfo, st)) {
|
||||
if ((m <<= 1) == 0x8000) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* magnitude overflow */
|
||||
return TRUE;
|
||||
}
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
|
||||
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
|
||||
else
|
||||
entropy->dc_context[ci] = 4 + (sign * 4); /* small diff category */
|
||||
v = m;
|
||||
/* Figure F.24: Decoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
if (arith_decode(cinfo, st)) v |= m;
|
||||
v += 1; if (sign) v = -v;
|
||||
entropy->last_dc_val[ci] += v;
|
||||
}
|
||||
|
||||
/* Scale and output the DC coefficient (assumes jpeg_natural_order[0]=0) */
|
||||
(*block)[0] = (JCOEF) (entropy->last_dc_val[ci] << cinfo->Al);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for AC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int tbl, sign, k;
|
||||
int v, m;
|
||||
const int * natural_order;
|
||||
|
||||
/* Process restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
process_restart(cinfo);
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
if (entropy->ct == -1) return TRUE; /* if error do nothing */
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* There is always only one block per MCU */
|
||||
block = MCU_data[0];
|
||||
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
|
||||
|
||||
/* Sections F.2.4.2 & F.1.4.4.2: Decoding of AC coefficients */
|
||||
|
||||
/* Figure F.20: Decode_AC_coefficients */
|
||||
for (k = cinfo->Ss; k <= cinfo->Se; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
if (arith_decode(cinfo, st)) break; /* EOB flag */
|
||||
while (arith_decode(cinfo, st + 1) == 0) {
|
||||
st += 3; k++;
|
||||
if (k > cinfo->Se) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* spectral overflow */
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
/* Figure F.21: Decoding nonzero value v */
|
||||
/* Figure F.22: Decoding the sign of v */
|
||||
sign = arith_decode(cinfo, entropy->fixed_bin);
|
||||
st += 2;
|
||||
/* Figure F.23: Decoding the magnitude category of v */
|
||||
if ((m = arith_decode(cinfo, st)) != 0) {
|
||||
if (arith_decode(cinfo, st)) {
|
||||
m <<= 1;
|
||||
st = entropy->ac_stats[tbl] +
|
||||
(k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
|
||||
while (arith_decode(cinfo, st)) {
|
||||
if ((m <<= 1) == 0x8000) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* magnitude overflow */
|
||||
return TRUE;
|
||||
}
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
v = m;
|
||||
/* Figure F.24: Decoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
if (arith_decode(cinfo, st)) v |= m;
|
||||
v += 1; if (sign) v = -v;
|
||||
/* Scale and output coefficient in natural (dezigzagged) order */
|
||||
(*block)[natural_order[k]] = (JCOEF) (v << cinfo->Al);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for DC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
unsigned char *st;
|
||||
int p1, blkn;
|
||||
|
||||
/* Process restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
process_restart(cinfo);
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
st = entropy->fixed_bin; /* use fixed probability estimation */
|
||||
p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
|
||||
|
||||
/* Outer loop handles each block in the MCU */
|
||||
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
/* Encoded data is simply the next bit of the two's-complement DC value */
|
||||
if (arith_decode(cinfo, st))
|
||||
MCU_data[blkn][0][0] |= p1;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for AC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
JBLOCKROW block;
|
||||
JCOEFPTR thiscoef;
|
||||
unsigned char *st;
|
||||
int tbl, k, kex;
|
||||
int p1, m1;
|
||||
const int * natural_order;
|
||||
|
||||
/* Process restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
process_restart(cinfo);
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
if (entropy->ct == -1) return TRUE; /* if error do nothing */
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* There is always only one block per MCU */
|
||||
block = MCU_data[0];
|
||||
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
|
||||
|
||||
p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
|
||||
m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
|
||||
|
||||
/* Establish EOBx (previous stage end-of-block) index */
|
||||
for (kex = cinfo->Se; kex > 0; kex--)
|
||||
if ((*block)[natural_order[kex]]) break;
|
||||
|
||||
for (k = cinfo->Ss; k <= cinfo->Se; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
if (k > kex)
|
||||
if (arith_decode(cinfo, st)) break; /* EOB flag */
|
||||
for (;;) {
|
||||
thiscoef = *block + natural_order[k];
|
||||
if (*thiscoef) { /* previously nonzero coef */
|
||||
if (arith_decode(cinfo, st + 2)) {
|
||||
if (*thiscoef < 0)
|
||||
*thiscoef += m1;
|
||||
else
|
||||
*thiscoef += p1;
|
||||
}
|
||||
break;
|
||||
}
|
||||
if (arith_decode(cinfo, st + 1)) { /* newly nonzero coef */
|
||||
if (arith_decode(cinfo, entropy->fixed_bin))
|
||||
*thiscoef = m1;
|
||||
else
|
||||
*thiscoef = p1;
|
||||
break;
|
||||
}
|
||||
st += 3; k++;
|
||||
if (k > cinfo->Se) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* spectral overflow */
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Decode one MCU's worth of arithmetic-compressed coefficients.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
jpeg_component_info * compptr;
|
||||
JBLOCKROW block;
|
||||
unsigned char *st;
|
||||
int blkn, ci, tbl, sign, k;
|
||||
int v, m;
|
||||
const int * natural_order;
|
||||
|
||||
/* Process restart marker if needed */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
process_restart(cinfo);
|
||||
entropy->restarts_to_go--;
|
||||
}
|
||||
|
||||
if (entropy->ct == -1) return TRUE; /* if error do nothing */
|
||||
|
||||
natural_order = cinfo->natural_order;
|
||||
|
||||
/* Outer loop handles each block in the MCU */
|
||||
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
|
||||
/* Sections F.2.4.1 & F.1.4.4.1: Decoding of DC coefficients */
|
||||
|
||||
tbl = compptr->dc_tbl_no;
|
||||
|
||||
/* Table F.4: Point to statistics bin S0 for DC coefficient coding */
|
||||
st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
|
||||
|
||||
/* Figure F.19: Decode_DC_DIFF */
|
||||
if (arith_decode(cinfo, st) == 0)
|
||||
entropy->dc_context[ci] = 0;
|
||||
else {
|
||||
/* Figure F.21: Decoding nonzero value v */
|
||||
/* Figure F.22: Decoding the sign of v */
|
||||
sign = arith_decode(cinfo, st + 1);
|
||||
st += 2; st += sign;
|
||||
/* Figure F.23: Decoding the magnitude category of v */
|
||||
if ((m = arith_decode(cinfo, st)) != 0) {
|
||||
st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
|
||||
while (arith_decode(cinfo, st)) {
|
||||
if ((m <<= 1) == 0x8000) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* magnitude overflow */
|
||||
return TRUE;
|
||||
}
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
|
||||
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 0; /* zero diff category */
|
||||
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
|
||||
entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
|
||||
else
|
||||
entropy->dc_context[ci] = 4 + (sign * 4); /* small diff category */
|
||||
v = m;
|
||||
/* Figure F.24: Decoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
if (arith_decode(cinfo, st)) v |= m;
|
||||
v += 1; if (sign) v = -v;
|
||||
entropy->last_dc_val[ci] += v;
|
||||
}
|
||||
|
||||
(*block)[0] = (JCOEF) entropy->last_dc_val[ci];
|
||||
|
||||
/* Sections F.2.4.2 & F.1.4.4.2: Decoding of AC coefficients */
|
||||
|
||||
tbl = compptr->ac_tbl_no;
|
||||
|
||||
/* Figure F.20: Decode_AC_coefficients */
|
||||
for (k = 1; k <= cinfo->lim_Se; k++) {
|
||||
st = entropy->ac_stats[tbl] + 3 * (k - 1);
|
||||
if (arith_decode(cinfo, st)) break; /* EOB flag */
|
||||
while (arith_decode(cinfo, st + 1) == 0) {
|
||||
st += 3; k++;
|
||||
if (k > cinfo->lim_Se) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* spectral overflow */
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
/* Figure F.21: Decoding nonzero value v */
|
||||
/* Figure F.22: Decoding the sign of v */
|
||||
sign = arith_decode(cinfo, entropy->fixed_bin);
|
||||
st += 2;
|
||||
/* Figure F.23: Decoding the magnitude category of v */
|
||||
if ((m = arith_decode(cinfo, st)) != 0) {
|
||||
if (arith_decode(cinfo, st)) {
|
||||
m <<= 1;
|
||||
st = entropy->ac_stats[tbl] +
|
||||
(k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
|
||||
while (arith_decode(cinfo, st)) {
|
||||
if ((m <<= 1) == 0x8000) {
|
||||
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
|
||||
entropy->ct = -1; /* magnitude overflow */
|
||||
return TRUE;
|
||||
}
|
||||
st += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
v = m;
|
||||
/* Figure F.24: Decoding the magnitude bit pattern of v */
|
||||
st += 14;
|
||||
while (m >>= 1)
|
||||
if (arith_decode(cinfo, st)) v |= m;
|
||||
v += 1; if (sign) v = -v;
|
||||
(*block)[natural_order[k]] = (JCOEF) v;
|
||||
}
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for an arithmetic-compressed scan.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass (j_decompress_ptr cinfo)
|
||||
{
|
||||
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
|
||||
int ci, tbl;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
if (cinfo->progressive_mode) {
|
||||
/* Validate progressive scan parameters */
|
||||
if (cinfo->Ss == 0) {
|
||||
if (cinfo->Se != 0)
|
||||
goto bad;
|
||||
} else {
|
||||
/* need not check Ss/Se < 0 since they came from unsigned bytes */
|
||||
if (cinfo->Se < cinfo->Ss || cinfo->Se > cinfo->lim_Se)
|
||||
goto bad;
|
||||
/* AC scans may have only one component */
|
||||
if (cinfo->comps_in_scan != 1)
|
||||
goto bad;
|
||||
}
|
||||
if (cinfo->Ah != 0) {
|
||||
/* Successive approximation refinement scan: must have Al = Ah-1. */
|
||||
if (cinfo->Ah-1 != cinfo->Al)
|
||||
goto bad;
|
||||
}
|
||||
if (cinfo->Al > 13) { /* need not check for < 0 */
|
||||
bad:
|
||||
ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
|
||||
cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
|
||||
}
|
||||
/* Update progression status, and verify that scan order is legal.
|
||||
* Note that inter-scan inconsistencies are treated as warnings
|
||||
* not fatal errors ... not clear if this is right way to behave.
|
||||
*/
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
int coefi, cindex = cinfo->cur_comp_info[ci]->component_index;
|
||||
int *coef_bit_ptr = & cinfo->coef_bits[cindex][0];
|
||||
if (cinfo->Ss && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
|
||||
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
|
||||
for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
|
||||
int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
|
||||
if (cinfo->Ah != expected)
|
||||
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
|
||||
coef_bit_ptr[coefi] = cinfo->Al;
|
||||
}
|
||||
}
|
||||
/* Select MCU decoding routine */
|
||||
if (cinfo->Ah == 0) {
|
||||
if (cinfo->Ss == 0)
|
||||
entropy->pub.decode_mcu = decode_mcu_DC_first;
|
||||
else
|
||||
entropy->pub.decode_mcu = decode_mcu_AC_first;
|
||||
} else {
|
||||
if (cinfo->Ss == 0)
|
||||
entropy->pub.decode_mcu = decode_mcu_DC_refine;
|
||||
else
|
||||
entropy->pub.decode_mcu = decode_mcu_AC_refine;
|
||||
}
|
||||
} else {
|
||||
/* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG.
|
||||
* This ought to be an error condition, but we make it a warning.
|
||||
*/
|
||||
if (cinfo->Ss != 0 || cinfo->Ah != 0 || cinfo->Al != 0 ||
|
||||
(cinfo->Se < DCTSIZE2 && cinfo->Se != cinfo->lim_Se))
|
||||
WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
|
||||
/* Select MCU decoding routine */
|
||||
entropy->pub.decode_mcu = decode_mcu;
|
||||
}
|
||||
|
||||
/* Allocate & initialize requested statistics areas */
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
|
||||
tbl = compptr->dc_tbl_no;
|
||||
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
|
||||
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
|
||||
if (entropy->dc_stats[tbl] == NULL)
|
||||
entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
|
||||
MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
|
||||
/* Initialize DC predictions to 0 */
|
||||
entropy->last_dc_val[ci] = 0;
|
||||
entropy->dc_context[ci] = 0;
|
||||
}
|
||||
if ((! cinfo->progressive_mode && cinfo->lim_Se) ||
|
||||
(cinfo->progressive_mode && cinfo->Ss)) {
|
||||
tbl = compptr->ac_tbl_no;
|
||||
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
|
||||
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
|
||||
if (entropy->ac_stats[tbl] == NULL)
|
||||
entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
|
||||
MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
|
||||
}
|
||||
}
|
||||
|
||||
/* Initialize arithmetic decoding variables */
|
||||
entropy->c = 0;
|
||||
entropy->a = 0;
|
||||
entropy->ct = -16; /* force reading 2 initial bytes to fill C */
|
||||
|
||||
/* Initialize restart counter */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Module initialization routine for arithmetic entropy decoding.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jinit_arith_decoder (j_decompress_ptr cinfo)
|
||||
{
|
||||
arith_entropy_ptr entropy;
|
||||
int i;
|
||||
|
||||
entropy = (arith_entropy_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(arith_entropy_decoder));
|
||||
cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
|
||||
entropy->pub.start_pass = start_pass;
|
||||
|
||||
/* Mark tables unallocated */
|
||||
for (i = 0; i < NUM_ARITH_TBLS; i++) {
|
||||
entropy->dc_stats[i] = NULL;
|
||||
entropy->ac_stats[i] = NULL;
|
||||
}
|
||||
|
||||
/* Initialize index for fixed probability estimation */
|
||||
entropy->fixed_bin[0] = 113;
|
||||
|
||||
if (cinfo->progressive_mode) {
|
||||
/* Create progression status table */
|
||||
int *coef_bit_ptr, ci;
|
||||
cinfo->coef_bits = (int (*)[DCTSIZE2])
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
cinfo->num_components*DCTSIZE2*SIZEOF(int));
|
||||
coef_bit_ptr = & cinfo->coef_bits[0][0];
|
||||
for (ci = 0; ci < cinfo->num_components; ci++)
|
||||
for (i = 0; i < DCTSIZE2; i++)
|
||||
*coef_bit_ptr++ = -1;
|
||||
}
|
||||
}
|
122
jpeg/jdatadst.c
122
jpeg/jdatadst.c
@ -2,13 +2,14 @@
|
||||
* jdatadst.c
|
||||
*
|
||||
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||||
* Modified 2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains compression data destination routines for the case of
|
||||
* emitting JPEG data to a file (or any stdio stream). While these routines
|
||||
* are sufficient for most applications, some will want to use a different
|
||||
* destination manager.
|
||||
* emitting JPEG data to memory or to a file (or any stdio stream).
|
||||
* While these routines are sufficient for most applications,
|
||||
* some will want to use a different destination manager.
|
||||
* IMPORTANT: we assume that fwrite() will correctly transcribe an array of
|
||||
* JOCTETs into 8-bit-wide elements on external storage. If char is wider
|
||||
* than 8 bits on your machine, you may need to do some tweaking.
|
||||
@ -19,6 +20,11 @@
|
||||
#include "jpeglib.h"
|
||||
#include "jerror.h"
|
||||
|
||||
#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
|
||||
extern void * malloc JPP((size_t size));
|
||||
extern void free JPP((void *ptr));
|
||||
#endif
|
||||
|
||||
|
||||
/* Expanded data destination object for stdio output */
|
||||
|
||||
@ -34,6 +40,21 @@ typedef my_destination_mgr * my_dest_ptr;
|
||||
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
|
||||
|
||||
|
||||
/* Expanded data destination object for memory output */
|
||||
|
||||
typedef struct {
|
||||
struct jpeg_destination_mgr pub; /* public fields */
|
||||
|
||||
unsigned char ** outbuffer; /* target buffer */
|
||||
unsigned long * outsize;
|
||||
unsigned char * newbuffer; /* newly allocated buffer */
|
||||
JOCTET * buffer; /* start of buffer */
|
||||
size_t bufsize;
|
||||
} my_mem_destination_mgr;
|
||||
|
||||
typedef my_mem_destination_mgr * my_mem_dest_ptr;
|
||||
|
||||
|
||||
/*
|
||||
* Initialize destination --- called by jpeg_start_compress
|
||||
* before any data is actually written.
|
||||
@ -53,6 +74,12 @@ init_destination (j_compress_ptr cinfo)
|
||||
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
|
||||
}
|
||||
|
||||
METHODDEF(void)
|
||||
init_mem_destination (j_compress_ptr cinfo)
|
||||
{
|
||||
/* no work necessary here */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Empty the output buffer --- called whenever buffer fills up.
|
||||
@ -92,6 +119,36 @@ empty_output_buffer (j_compress_ptr cinfo)
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHODDEF(boolean)
|
||||
empty_mem_output_buffer (j_compress_ptr cinfo)
|
||||
{
|
||||
size_t nextsize;
|
||||
JOCTET * nextbuffer;
|
||||
my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
|
||||
|
||||
/* Try to allocate new buffer with double size */
|
||||
nextsize = dest->bufsize * 2;
|
||||
nextbuffer = malloc(nextsize);
|
||||
|
||||
if (nextbuffer == NULL)
|
||||
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
|
||||
|
||||
MEMCOPY(nextbuffer, dest->buffer, dest->bufsize);
|
||||
|
||||
if (dest->newbuffer != NULL)
|
||||
free(dest->newbuffer);
|
||||
|
||||
dest->newbuffer = nextbuffer;
|
||||
|
||||
dest->pub.next_output_byte = nextbuffer + dest->bufsize;
|
||||
dest->pub.free_in_buffer = dest->bufsize;
|
||||
|
||||
dest->buffer = nextbuffer;
|
||||
dest->bufsize = nextsize;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Terminate destination --- called by jpeg_finish_compress
|
||||
@ -119,6 +176,15 @@ term_destination (j_compress_ptr cinfo)
|
||||
ERREXIT(cinfo, JERR_FILE_WRITE);
|
||||
}
|
||||
|
||||
METHODDEF(void)
|
||||
term_mem_destination (j_compress_ptr cinfo)
|
||||
{
|
||||
my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
|
||||
|
||||
*dest->outbuffer = dest->buffer;
|
||||
*dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Prepare for output to a stdio stream.
|
||||
@ -149,3 +215,53 @@ jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile)
|
||||
dest->pub.term_destination = term_destination;
|
||||
dest->outfile = outfile;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Prepare for output to a memory buffer.
|
||||
* The caller may supply an own initial buffer with appropriate size.
|
||||
* Otherwise, or when the actual data output exceeds the given size,
|
||||
* the library adapts the buffer size as necessary.
|
||||
* The standard library functions malloc/free are used for allocating
|
||||
* larger memory, so the buffer is available to the application after
|
||||
* finishing compression, and then the application is responsible for
|
||||
* freeing the requested memory.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_mem_dest (j_compress_ptr cinfo,
|
||||
unsigned char ** outbuffer, unsigned long * outsize)
|
||||
{
|
||||
my_mem_dest_ptr dest;
|
||||
|
||||
if (outbuffer == NULL || outsize == NULL) /* sanity check */
|
||||
ERREXIT(cinfo, JERR_BUFFER_SIZE);
|
||||
|
||||
/* The destination object is made permanent so that multiple JPEG images
|
||||
* can be written to the same buffer without re-executing jpeg_mem_dest.
|
||||
*/
|
||||
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
|
||||
cinfo->dest = (struct jpeg_destination_mgr *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
|
||||
SIZEOF(my_mem_destination_mgr));
|
||||
}
|
||||
|
||||
dest = (my_mem_dest_ptr) cinfo->dest;
|
||||
dest->pub.init_destination = init_mem_destination;
|
||||
dest->pub.empty_output_buffer = empty_mem_output_buffer;
|
||||
dest->pub.term_destination = term_mem_destination;
|
||||
dest->outbuffer = outbuffer;
|
||||
dest->outsize = outsize;
|
||||
dest->newbuffer = NULL;
|
||||
|
||||
if (*outbuffer == NULL || *outsize == 0) {
|
||||
/* Allocate initial buffer */
|
||||
dest->newbuffer = *outbuffer = malloc(OUTPUT_BUF_SIZE);
|
||||
if (dest->newbuffer == NULL)
|
||||
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
|
||||
*outsize = OUTPUT_BUF_SIZE;
|
||||
}
|
||||
|
||||
dest->pub.next_output_byte = dest->buffer = *outbuffer;
|
||||
dest->pub.free_in_buffer = dest->bufsize = *outsize;
|
||||
}
|
||||
|
@ -2,13 +2,14 @@
|
||||
* jdatasrc.c
|
||||
*
|
||||
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||||
* Modified 2009-2010 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains decompression data source routines for the case of
|
||||
* reading JPEG data from a file (or any stdio stream). While these routines
|
||||
* are sufficient for most applications, some will want to use a different
|
||||
* source manager.
|
||||
* reading JPEG data from memory or from a file (or any stdio stream).
|
||||
* While these routines are sufficient for most applications,
|
||||
* some will want to use a different source manager.
|
||||
* IMPORTANT: we assume that fread() will correctly transcribe an array of
|
||||
* JOCTETs from 8-bit-wide elements on external storage. If char is wider
|
||||
* than 8 bits on your machine, you may need to do some tweaking.
|
||||
@ -52,6 +53,12 @@ init_source (j_decompress_ptr cinfo)
|
||||
src->start_of_file = TRUE;
|
||||
}
|
||||
|
||||
METHODDEF(void)
|
||||
init_mem_source (j_decompress_ptr cinfo)
|
||||
{
|
||||
/* no work necessary here */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Fill the input buffer --- called whenever buffer is emptied.
|
||||
@ -111,6 +118,26 @@ fill_input_buffer (j_decompress_ptr cinfo)
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHODDEF(boolean)
|
||||
fill_mem_input_buffer (j_decompress_ptr cinfo)
|
||||
{
|
||||
static JOCTET mybuffer[4];
|
||||
|
||||
/* The whole JPEG data is expected to reside in the supplied memory
|
||||
* buffer, so any request for more data beyond the given buffer size
|
||||
* is treated as an error.
|
||||
*/
|
||||
WARNMS(cinfo, JWRN_JPEG_EOF);
|
||||
/* Insert a fake EOI marker */
|
||||
mybuffer[0] = (JOCTET) 0xFF;
|
||||
mybuffer[1] = (JOCTET) JPEG_EOI;
|
||||
|
||||
cinfo->src->next_input_byte = mybuffer;
|
||||
cinfo->src->bytes_in_buffer = 2;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Skip data --- used to skip over a potentially large amount of
|
||||
@ -127,22 +154,22 @@ fill_input_buffer (j_decompress_ptr cinfo)
|
||||
METHODDEF(void)
|
||||
skip_input_data (j_decompress_ptr cinfo, long num_bytes)
|
||||
{
|
||||
my_src_ptr src = (my_src_ptr) cinfo->src;
|
||||
struct jpeg_source_mgr * src = cinfo->src;
|
||||
|
||||
/* Just a dumb implementation for now. Could use fseek() except
|
||||
* it doesn't work on pipes. Not clear that being smart is worth
|
||||
* any trouble anyway --- large skips are infrequent.
|
||||
*/
|
||||
if (num_bytes > 0) {
|
||||
while (num_bytes > (long) src->pub.bytes_in_buffer) {
|
||||
num_bytes -= (long) src->pub.bytes_in_buffer;
|
||||
(void) fill_input_buffer(cinfo);
|
||||
while (num_bytes > (long) src->bytes_in_buffer) {
|
||||
num_bytes -= (long) src->bytes_in_buffer;
|
||||
(void) (*src->fill_input_buffer) (cinfo);
|
||||
/* note we assume that fill_input_buffer will never return FALSE,
|
||||
* so suspension need not be handled.
|
||||
*/
|
||||
}
|
||||
src->pub.next_input_byte += (size_t) num_bytes;
|
||||
src->pub.bytes_in_buffer -= (size_t) num_bytes;
|
||||
src->next_input_byte += (size_t) num_bytes;
|
||||
src->bytes_in_buffer -= (size_t) num_bytes;
|
||||
}
|
||||
}
|
||||
|
||||
@ -210,3 +237,38 @@ jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile)
|
||||
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
|
||||
src->pub.next_input_byte = NULL; /* until buffer loaded */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Prepare for input from a supplied memory buffer.
|
||||
* The buffer must contain the whole JPEG data.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_mem_src (j_decompress_ptr cinfo,
|
||||
unsigned char * inbuffer, unsigned long insize)
|
||||
{
|
||||
struct jpeg_source_mgr * src;
|
||||
|
||||
if (inbuffer == NULL || insize == 0) /* Treat empty input as fatal error */
|
||||
ERREXIT(cinfo, JERR_INPUT_EMPTY);
|
||||
|
||||
/* The source object is made permanent so that a series of JPEG images
|
||||
* can be read from the same buffer by calling jpeg_mem_src only before
|
||||
* the first one.
|
||||
*/
|
||||
if (cinfo->src == NULL) { /* first time for this JPEG object? */
|
||||
cinfo->src = (struct jpeg_source_mgr *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
|
||||
SIZEOF(struct jpeg_source_mgr));
|
||||
}
|
||||
|
||||
src = cinfo->src;
|
||||
src->init_source = init_mem_source;
|
||||
src->fill_input_buffer = fill_mem_input_buffer;
|
||||
src->skip_input_data = skip_input_data;
|
||||
src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
|
||||
src->term_source = term_source;
|
||||
src->bytes_in_buffer = (size_t) insize;
|
||||
src->next_input_byte = (JOCTET *) inbuffer;
|
||||
}
|
||||
|
@ -187,7 +187,7 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
|
||||
useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
|
||||
: compptr->last_col_width;
|
||||
output_ptr = output_buf[compptr->component_index] +
|
||||
yoffset * compptr->DCT_scaled_size;
|
||||
yoffset * compptr->DCT_v_scaled_size;
|
||||
start_col = MCU_col_num * compptr->MCU_sample_width;
|
||||
for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
|
||||
if (cinfo->input_iMCU_row < last_iMCU_row ||
|
||||
@ -197,11 +197,11 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
|
||||
(*inverse_DCT) (cinfo, compptr,
|
||||
(JCOEFPTR) coef->MCU_buffer[blkn+xindex],
|
||||
output_ptr, output_col);
|
||||
output_col += compptr->DCT_scaled_size;
|
||||
output_col += compptr->DCT_h_scaled_size;
|
||||
}
|
||||
}
|
||||
blkn += compptr->MCU_width;
|
||||
output_ptr += compptr->DCT_scaled_size;
|
||||
output_ptr += compptr->DCT_v_scaled_size;
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -362,9 +362,9 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
|
||||
(*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr,
|
||||
output_ptr, output_col);
|
||||
buffer_ptr++;
|
||||
output_col += compptr->DCT_scaled_size;
|
||||
output_col += compptr->DCT_h_scaled_size;
|
||||
}
|
||||
output_ptr += compptr->DCT_scaled_size;
|
||||
output_ptr += compptr->DCT_v_scaled_size;
|
||||
}
|
||||
}
|
||||
|
||||
@ -654,9 +654,9 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
|
||||
DC4 = DC5; DC5 = DC6;
|
||||
DC7 = DC8; DC8 = DC9;
|
||||
buffer_ptr++, prev_block_row++, next_block_row++;
|
||||
output_col += compptr->DCT_scaled_size;
|
||||
output_col += compptr->DCT_h_scaled_size;
|
||||
}
|
||||
output_ptr += compptr->DCT_scaled_size;
|
||||
output_ptr += compptr->DCT_v_scaled_size;
|
||||
}
|
||||
}
|
||||
|
||||
|
239
jpeg/jdct.h
239
jpeg/jdct.h
@ -14,11 +14,16 @@
|
||||
|
||||
|
||||
/*
|
||||
* A forward DCT routine is given a pointer to a work area of type DCTELEM[];
|
||||
* the DCT is to be performed in-place in that buffer. Type DCTELEM is int
|
||||
* for 8-bit samples, INT32 for 12-bit samples. (NOTE: Floating-point DCT
|
||||
* implementations use an array of type FAST_FLOAT, instead.)
|
||||
* The DCT inputs are expected to be signed (range +-CENTERJSAMPLE).
|
||||
* A forward DCT routine is given a pointer to an input sample array and
|
||||
* a pointer to a work area of type DCTELEM[]; the DCT is to be performed
|
||||
* in-place in that buffer. Type DCTELEM is int for 8-bit samples, INT32
|
||||
* for 12-bit samples. (NOTE: Floating-point DCT implementations use an
|
||||
* array of type FAST_FLOAT, instead.)
|
||||
* The input data is to be fetched from the sample array starting at a
|
||||
* specified column. (Any row offset needed will be applied to the array
|
||||
* pointer before it is passed to the FDCT code.)
|
||||
* Note that the number of samples fetched by the FDCT routine is
|
||||
* DCT_h_scaled_size * DCT_v_scaled_size.
|
||||
* The DCT outputs are returned scaled up by a factor of 8; they therefore
|
||||
* have a range of +-8K for 8-bit data, +-128K for 12-bit data. This
|
||||
* convention improves accuracy in integer implementations and saves some
|
||||
@ -32,8 +37,12 @@ typedef int DCTELEM; /* 16 or 32 bits is fine */
|
||||
typedef INT32 DCTELEM; /* must have 32 bits */
|
||||
#endif
|
||||
|
||||
typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data));
|
||||
typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data));
|
||||
typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data,
|
||||
JSAMPARRAY sample_data,
|
||||
JDIMENSION start_col));
|
||||
typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data,
|
||||
JSAMPARRAY sample_data,
|
||||
JDIMENSION start_col));
|
||||
|
||||
|
||||
/*
|
||||
@ -44,7 +53,7 @@ typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data));
|
||||
* sample array starting at a specified column. (Any row offset needed will
|
||||
* be applied to the array pointer before it is passed to the IDCT code.)
|
||||
* Note that the number of samples emitted by the IDCT routine is
|
||||
* DCT_scaled_size * DCT_scaled_size.
|
||||
* DCT_h_scaled_size * DCT_v_scaled_size.
|
||||
*/
|
||||
|
||||
/* typedef inverse_DCT_method_ptr is declared in jpegint.h */
|
||||
@ -84,19 +93,143 @@ typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */
|
||||
#define jpeg_fdct_islow jFDislow
|
||||
#define jpeg_fdct_ifast jFDifast
|
||||
#define jpeg_fdct_float jFDfloat
|
||||
#define jpeg_fdct_7x7 jFD7x7
|
||||
#define jpeg_fdct_6x6 jFD6x6
|
||||
#define jpeg_fdct_5x5 jFD5x5
|
||||
#define jpeg_fdct_4x4 jFD4x4
|
||||
#define jpeg_fdct_3x3 jFD3x3
|
||||
#define jpeg_fdct_2x2 jFD2x2
|
||||
#define jpeg_fdct_1x1 jFD1x1
|
||||
#define jpeg_fdct_9x9 jFD9x9
|
||||
#define jpeg_fdct_10x10 jFD10x10
|
||||
#define jpeg_fdct_11x11 jFD11x11
|
||||
#define jpeg_fdct_12x12 jFD12x12
|
||||
#define jpeg_fdct_13x13 jFD13x13
|
||||
#define jpeg_fdct_14x14 jFD14x14
|
||||
#define jpeg_fdct_15x15 jFD15x15
|
||||
#define jpeg_fdct_16x16 jFD16x16
|
||||
#define jpeg_fdct_16x8 jFD16x8
|
||||
#define jpeg_fdct_14x7 jFD14x7
|
||||
#define jpeg_fdct_12x6 jFD12x6
|
||||
#define jpeg_fdct_10x5 jFD10x5
|
||||
#define jpeg_fdct_8x4 jFD8x4
|
||||
#define jpeg_fdct_6x3 jFD6x3
|
||||
#define jpeg_fdct_4x2 jFD4x2
|
||||
#define jpeg_fdct_2x1 jFD2x1
|
||||
#define jpeg_fdct_8x16 jFD8x16
|
||||
#define jpeg_fdct_7x14 jFD7x14
|
||||
#define jpeg_fdct_6x12 jFD6x12
|
||||
#define jpeg_fdct_5x10 jFD5x10
|
||||
#define jpeg_fdct_4x8 jFD4x8
|
||||
#define jpeg_fdct_3x6 jFD3x6
|
||||
#define jpeg_fdct_2x4 jFD2x4
|
||||
#define jpeg_fdct_1x2 jFD1x2
|
||||
#define jpeg_idct_islow jRDislow
|
||||
#define jpeg_idct_ifast jRDifast
|
||||
#define jpeg_idct_float jRDfloat
|
||||
#define jpeg_idct_7x7 jRD7x7
|
||||
#define jpeg_idct_6x6 jRD6x6
|
||||
#define jpeg_idct_5x5 jRD5x5
|
||||
#define jpeg_idct_4x4 jRD4x4
|
||||
#define jpeg_idct_3x3 jRD3x3
|
||||
#define jpeg_idct_2x2 jRD2x2
|
||||
#define jpeg_idct_1x1 jRD1x1
|
||||
#define jpeg_idct_9x9 jRD9x9
|
||||
#define jpeg_idct_10x10 jRD10x10
|
||||
#define jpeg_idct_11x11 jRD11x11
|
||||
#define jpeg_idct_12x12 jRD12x12
|
||||
#define jpeg_idct_13x13 jRD13x13
|
||||
#define jpeg_idct_14x14 jRD14x14
|
||||
#define jpeg_idct_15x15 jRD15x15
|
||||
#define jpeg_idct_16x16 jRD16x16
|
||||
#define jpeg_idct_16x8 jRD16x8
|
||||
#define jpeg_idct_14x7 jRD14x7
|
||||
#define jpeg_idct_12x6 jRD12x6
|
||||
#define jpeg_idct_10x5 jRD10x5
|
||||
#define jpeg_idct_8x4 jRD8x4
|
||||
#define jpeg_idct_6x3 jRD6x3
|
||||
#define jpeg_idct_4x2 jRD4x2
|
||||
#define jpeg_idct_2x1 jRD2x1
|
||||
#define jpeg_idct_8x16 jRD8x16
|
||||
#define jpeg_idct_7x14 jRD7x14
|
||||
#define jpeg_idct_6x12 jRD6x12
|
||||
#define jpeg_idct_5x10 jRD5x10
|
||||
#define jpeg_idct_4x8 jRD4x8
|
||||
#define jpeg_idct_3x6 jRD3x8
|
||||
#define jpeg_idct_2x4 jRD2x4
|
||||
#define jpeg_idct_1x2 jRD1x2
|
||||
#endif /* NEED_SHORT_EXTERNAL_NAMES */
|
||||
|
||||
/* Extern declarations for the forward and inverse DCT routines. */
|
||||
|
||||
EXTERN(void) jpeg_fdct_islow JPP((DCTELEM * data));
|
||||
EXTERN(void) jpeg_fdct_ifast JPP((DCTELEM * data));
|
||||
EXTERN(void) jpeg_fdct_float JPP((FAST_FLOAT * data));
|
||||
EXTERN(void) jpeg_fdct_islow
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_ifast
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_float
|
||||
JPP((FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_7x7
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_6x6
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_5x5
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_4x4
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_3x3
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_2x2
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_1x1
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_9x9
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_10x10
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_11x11
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_12x12
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_13x13
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_14x14
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_15x15
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_16x16
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_16x8
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_14x7
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_12x6
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_10x5
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_8x4
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_6x3
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_4x2
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_2x1
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_8x16
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_7x14
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_6x12
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_5x10
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_4x8
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_3x6
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_2x4
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
EXTERN(void) jpeg_fdct_1x2
|
||||
JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
|
||||
|
||||
EXTERN(void) jpeg_idct_islow
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
@ -107,15 +240,99 @@ EXTERN(void) jpeg_idct_ifast
|
||||
EXTERN(void) jpeg_idct_float
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_7x7
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_6x6
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_5x5
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_4x4
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_3x3
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_2x2
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_1x1
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_9x9
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_10x10
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_11x11
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_12x12
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_13x13
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_14x14
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_15x15
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_16x16
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_16x8
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_14x7
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_12x6
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_10x5
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_8x4
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_6x3
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_4x2
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_2x1
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_8x16
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_7x14
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_6x12
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_5x10
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_4x8
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_3x6
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_2x4
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
EXTERN(void) jpeg_idct_1x2
|
||||
JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
|
||||
|
||||
|
||||
/*
|
||||
|
135
jpeg/jddctmgr.c
135
jpeg/jddctmgr.c
@ -2,6 +2,7 @@
|
||||
* jddctmgr.c
|
||||
*
|
||||
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||||
* Modified 2002-2010 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -98,22 +99,134 @@ start_pass (j_decompress_ptr cinfo)
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
/* Select the proper IDCT routine for this component's scaling */
|
||||
switch (compptr->DCT_scaled_size) {
|
||||
switch ((compptr->DCT_h_scaled_size << 8) + compptr->DCT_v_scaled_size) {
|
||||
#ifdef IDCT_SCALING_SUPPORTED
|
||||
case 1:
|
||||
case ((1 << 8) + 1):
|
||||
method_ptr = jpeg_idct_1x1;
|
||||
method = JDCT_ISLOW; /* jidctred uses islow-style table */
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case 2:
|
||||
case ((2 << 8) + 2):
|
||||
method_ptr = jpeg_idct_2x2;
|
||||
method = JDCT_ISLOW; /* jidctred uses islow-style table */
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case 4:
|
||||
case ((3 << 8) + 3):
|
||||
method_ptr = jpeg_idct_3x3;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 4):
|
||||
method_ptr = jpeg_idct_4x4;
|
||||
method = JDCT_ISLOW; /* jidctred uses islow-style table */
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((5 << 8) + 5):
|
||||
method_ptr = jpeg_idct_5x5;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 6):
|
||||
method_ptr = jpeg_idct_6x6;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((7 << 8) + 7):
|
||||
method_ptr = jpeg_idct_7x7;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((9 << 8) + 9):
|
||||
method_ptr = jpeg_idct_9x9;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((10 << 8) + 10):
|
||||
method_ptr = jpeg_idct_10x10;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((11 << 8) + 11):
|
||||
method_ptr = jpeg_idct_11x11;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((12 << 8) + 12):
|
||||
method_ptr = jpeg_idct_12x12;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((13 << 8) + 13):
|
||||
method_ptr = jpeg_idct_13x13;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((14 << 8) + 14):
|
||||
method_ptr = jpeg_idct_14x14;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((15 << 8) + 15):
|
||||
method_ptr = jpeg_idct_15x15;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((16 << 8) + 16):
|
||||
method_ptr = jpeg_idct_16x16;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((16 << 8) + 8):
|
||||
method_ptr = jpeg_idct_16x8;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((14 << 8) + 7):
|
||||
method_ptr = jpeg_idct_14x7;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((12 << 8) + 6):
|
||||
method_ptr = jpeg_idct_12x6;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((10 << 8) + 5):
|
||||
method_ptr = jpeg_idct_10x5;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((8 << 8) + 4):
|
||||
method_ptr = jpeg_idct_8x4;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 3):
|
||||
method_ptr = jpeg_idct_6x3;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 2):
|
||||
method_ptr = jpeg_idct_4x2;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((2 << 8) + 1):
|
||||
method_ptr = jpeg_idct_2x1;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((8 << 8) + 16):
|
||||
method_ptr = jpeg_idct_8x16;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((7 << 8) + 14):
|
||||
method_ptr = jpeg_idct_7x14;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((6 << 8) + 12):
|
||||
method_ptr = jpeg_idct_6x12;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((5 << 8) + 10):
|
||||
method_ptr = jpeg_idct_5x10;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((4 << 8) + 8):
|
||||
method_ptr = jpeg_idct_4x8;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((3 << 8) + 6):
|
||||
method_ptr = jpeg_idct_3x6;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((2 << 8) + 4):
|
||||
method_ptr = jpeg_idct_2x4;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
case ((1 << 8) + 2):
|
||||
method_ptr = jpeg_idct_1x2;
|
||||
method = JDCT_ISLOW; /* jidctint uses islow-style table */
|
||||
break;
|
||||
#endif
|
||||
case DCTSIZE:
|
||||
case ((DCTSIZE << 8) + DCTSIZE):
|
||||
switch (cinfo->dct_method) {
|
||||
#ifdef DCT_ISLOW_SUPPORTED
|
||||
case JDCT_ISLOW:
|
||||
@ -139,7 +252,8 @@ start_pass (j_decompress_ptr cinfo)
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ERREXIT1(cinfo, JERR_BAD_DCTSIZE, compptr->DCT_scaled_size);
|
||||
ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
|
||||
compptr->DCT_h_scaled_size, compptr->DCT_v_scaled_size);
|
||||
break;
|
||||
}
|
||||
idct->pub.inverse_DCT[ci] = method_ptr;
|
||||
@ -211,6 +325,7 @@ start_pass (j_decompress_ptr cinfo)
|
||||
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
||||
* scalefactor[0] = 1
|
||||
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
||||
* We apply a further scale factor of 1/8.
|
||||
*/
|
||||
FLOAT_MULT_TYPE * fmtbl = (FLOAT_MULT_TYPE *) compptr->dct_table;
|
||||
int row, col;
|
||||
@ -224,7 +339,7 @@ start_pass (j_decompress_ptr cinfo)
|
||||
for (col = 0; col < DCTSIZE; col++) {
|
||||
fmtbl[i] = (FLOAT_MULT_TYPE)
|
||||
((double) qtbl->quantval[i] *
|
||||
aanscalefactor[row] * aanscalefactor[col]);
|
||||
aanscalefactor[row] * aanscalefactor[col] * 0.125);
|
||||
i++;
|
||||
}
|
||||
}
|
||||
|
1176
jpeg/jdhuff.c
1176
jpeg/jdhuff.c
File diff suppressed because it is too large
Load Diff
201
jpeg/jdhuff.h
201
jpeg/jdhuff.h
@ -1,201 +0,0 @@
|
||||
/*
|
||||
* jdhuff.h
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains declarations for Huffman entropy decoding routines
|
||||
* that are shared between the sequential decoder (jdhuff.c) and the
|
||||
* progressive decoder (jdphuff.c). No other modules need to see these.
|
||||
*/
|
||||
|
||||
/* Short forms of external names for systems with brain-damaged linkers. */
|
||||
|
||||
#ifdef NEED_SHORT_EXTERNAL_NAMES
|
||||
#define jpeg_make_d_derived_tbl jMkDDerived
|
||||
#define jpeg_fill_bit_buffer jFilBitBuf
|
||||
#define jpeg_huff_decode jHufDecode
|
||||
#endif /* NEED_SHORT_EXTERNAL_NAMES */
|
||||
|
||||
|
||||
/* Derived data constructed for each Huffman table */
|
||||
|
||||
#define HUFF_LOOKAHEAD 8 /* # of bits of lookahead */
|
||||
|
||||
typedef struct {
|
||||
/* Basic tables: (element [0] of each array is unused) */
|
||||
INT32 maxcode[18]; /* largest code of length k (-1 if none) */
|
||||
/* (maxcode[17] is a sentinel to ensure jpeg_huff_decode terminates) */
|
||||
INT32 valoffset[17]; /* huffval[] offset for codes of length k */
|
||||
/* valoffset[k] = huffval[] index of 1st symbol of code length k, less
|
||||
* the smallest code of length k; so given a code of length k, the
|
||||
* corresponding symbol is huffval[code + valoffset[k]]
|
||||
*/
|
||||
|
||||
/* Link to public Huffman table (needed only in jpeg_huff_decode) */
|
||||
JHUFF_TBL *pub;
|
||||
|
||||
/* Lookahead tables: indexed by the next HUFF_LOOKAHEAD bits of
|
||||
* the input data stream. If the next Huffman code is no more
|
||||
* than HUFF_LOOKAHEAD bits long, we can obtain its length and
|
||||
* the corresponding symbol directly from these tables.
|
||||
*/
|
||||
int look_nbits[1<<HUFF_LOOKAHEAD]; /* # bits, or 0 if too long */
|
||||
UINT8 look_sym[1<<HUFF_LOOKAHEAD]; /* symbol, or unused */
|
||||
} d_derived_tbl;
|
||||
|
||||
/* Expand a Huffman table definition into the derived format */
|
||||
EXTERN(void) jpeg_make_d_derived_tbl
|
||||
JPP((j_decompress_ptr cinfo, boolean isDC, int tblno,
|
||||
d_derived_tbl ** pdtbl));
|
||||
|
||||
|
||||
/*
|
||||
* Fetching the next N bits from the input stream is a time-critical operation
|
||||
* for the Huffman decoders. We implement it with a combination of inline
|
||||
* macros and out-of-line subroutines. Note that N (the number of bits
|
||||
* demanded at one time) never exceeds 15 for JPEG use.
|
||||
*
|
||||
* We read source bytes into get_buffer and dole out bits as needed.
|
||||
* If get_buffer already contains enough bits, they are fetched in-line
|
||||
* by the macros CHECK_BIT_BUFFER and GET_BITS. When there aren't enough
|
||||
* bits, jpeg_fill_bit_buffer is called; it will attempt to fill get_buffer
|
||||
* as full as possible (not just to the number of bits needed; this
|
||||
* prefetching reduces the overhead cost of calling jpeg_fill_bit_buffer).
|
||||
* Note that jpeg_fill_bit_buffer may return FALSE to indicate suspension.
|
||||
* On TRUE return, jpeg_fill_bit_buffer guarantees that get_buffer contains
|
||||
* at least the requested number of bits --- dummy zeroes are inserted if
|
||||
* necessary.
|
||||
*/
|
||||
|
||||
typedef INT32 bit_buf_type; /* type of bit-extraction buffer */
|
||||
#define BIT_BUF_SIZE 32 /* size of buffer in bits */
|
||||
|
||||
/* If long is > 32 bits on your machine, and shifting/masking longs is
|
||||
* reasonably fast, making bit_buf_type be long and setting BIT_BUF_SIZE
|
||||
* appropriately should be a win. Unfortunately we can't define the size
|
||||
* with something like #define BIT_BUF_SIZE (sizeof(bit_buf_type)*8)
|
||||
* because not all machines measure sizeof in 8-bit bytes.
|
||||
*/
|
||||
|
||||
typedef struct { /* Bitreading state saved across MCUs */
|
||||
bit_buf_type get_buffer; /* current bit-extraction buffer */
|
||||
int bits_left; /* # of unused bits in it */
|
||||
} bitread_perm_state;
|
||||
|
||||
typedef struct { /* Bitreading working state within an MCU */
|
||||
/* Current data source location */
|
||||
/* We need a copy, rather than munging the original, in case of suspension */
|
||||
const JOCTET * next_input_byte; /* => next byte to read from source */
|
||||
size_t bytes_in_buffer; /* # of bytes remaining in source buffer */
|
||||
/* Bit input buffer --- note these values are kept in register variables,
|
||||
* not in this struct, inside the inner loops.
|
||||
*/
|
||||
bit_buf_type get_buffer; /* current bit-extraction buffer */
|
||||
int bits_left; /* # of unused bits in it */
|
||||
/* Pointer needed by jpeg_fill_bit_buffer. */
|
||||
j_decompress_ptr cinfo; /* back link to decompress master record */
|
||||
} bitread_working_state;
|
||||
|
||||
/* Macros to declare and load/save bitread local variables. */
|
||||
#define BITREAD_STATE_VARS \
|
||||
register bit_buf_type get_buffer; \
|
||||
register int bits_left; \
|
||||
bitread_working_state br_state
|
||||
|
||||
#define BITREAD_LOAD_STATE(cinfop,permstate) \
|
||||
br_state.cinfo = cinfop; \
|
||||
br_state.next_input_byte = cinfop->src->next_input_byte; \
|
||||
br_state.bytes_in_buffer = cinfop->src->bytes_in_buffer; \
|
||||
get_buffer = permstate.get_buffer; \
|
||||
bits_left = permstate.bits_left;
|
||||
|
||||
#define BITREAD_SAVE_STATE(cinfop,permstate) \
|
||||
cinfop->src->next_input_byte = br_state.next_input_byte; \
|
||||
cinfop->src->bytes_in_buffer = br_state.bytes_in_buffer; \
|
||||
permstate.get_buffer = get_buffer; \
|
||||
permstate.bits_left = bits_left
|
||||
|
||||
/*
|
||||
* These macros provide the in-line portion of bit fetching.
|
||||
* Use CHECK_BIT_BUFFER to ensure there are N bits in get_buffer
|
||||
* before using GET_BITS, PEEK_BITS, or DROP_BITS.
|
||||
* The variables get_buffer and bits_left are assumed to be locals,
|
||||
* but the state struct might not be (jpeg_huff_decode needs this).
|
||||
* CHECK_BIT_BUFFER(state,n,action);
|
||||
* Ensure there are N bits in get_buffer; if suspend, take action.
|
||||
* val = GET_BITS(n);
|
||||
* Fetch next N bits.
|
||||
* val = PEEK_BITS(n);
|
||||
* Fetch next N bits without removing them from the buffer.
|
||||
* DROP_BITS(n);
|
||||
* Discard next N bits.
|
||||
* The value N should be a simple variable, not an expression, because it
|
||||
* is evaluated multiple times.
|
||||
*/
|
||||
|
||||
#define CHECK_BIT_BUFFER(state,nbits,action) \
|
||||
{ if (bits_left < (nbits)) { \
|
||||
if (! jpeg_fill_bit_buffer(&(state),get_buffer,bits_left,nbits)) \
|
||||
{ action; } \
|
||||
get_buffer = (state).get_buffer; bits_left = (state).bits_left; } }
|
||||
|
||||
#define GET_BITS(nbits) \
|
||||
(((int) (get_buffer >> (bits_left -= (nbits)))) & ((1<<(nbits))-1))
|
||||
|
||||
#define PEEK_BITS(nbits) \
|
||||
(((int) (get_buffer >> (bits_left - (nbits)))) & ((1<<(nbits))-1))
|
||||
|
||||
#define DROP_BITS(nbits) \
|
||||
(bits_left -= (nbits))
|
||||
|
||||
/* Load up the bit buffer to a depth of at least nbits */
|
||||
EXTERN(boolean) jpeg_fill_bit_buffer
|
||||
JPP((bitread_working_state * state, register bit_buf_type get_buffer,
|
||||
register int bits_left, int nbits));
|
||||
|
||||
|
||||
/*
|
||||
* Code for extracting next Huffman-coded symbol from input bit stream.
|
||||
* Again, this is time-critical and we make the main paths be macros.
|
||||
*
|
||||
* We use a lookahead table to process codes of up to HUFF_LOOKAHEAD bits
|
||||
* without looping. Usually, more than 95% of the Huffman codes will be 8
|
||||
* or fewer bits long. The few overlength codes are handled with a loop,
|
||||
* which need not be inline code.
|
||||
*
|
||||
* Notes about the HUFF_DECODE macro:
|
||||
* 1. Near the end of the data segment, we may fail to get enough bits
|
||||
* for a lookahead. In that case, we do it the hard way.
|
||||
* 2. If the lookahead table contains no entry, the next code must be
|
||||
* more than HUFF_LOOKAHEAD bits long.
|
||||
* 3. jpeg_huff_decode returns -1 if forced to suspend.
|
||||
*/
|
||||
|
||||
#define HUFF_DECODE(result,state,htbl,failaction,slowlabel) \
|
||||
{ register int nb, look; \
|
||||
if (bits_left < HUFF_LOOKAHEAD) { \
|
||||
if (! jpeg_fill_bit_buffer(&state,get_buffer,bits_left, 0)) {failaction;} \
|
||||
get_buffer = state.get_buffer; bits_left = state.bits_left; \
|
||||
if (bits_left < HUFF_LOOKAHEAD) { \
|
||||
nb = 1; goto slowlabel; \
|
||||
} \
|
||||
} \
|
||||
look = PEEK_BITS(HUFF_LOOKAHEAD); \
|
||||
if ((nb = htbl->look_nbits[look]) != 0) { \
|
||||
DROP_BITS(nb); \
|
||||
result = htbl->look_sym[look]; \
|
||||
} else { \
|
||||
nb = HUFF_LOOKAHEAD+1; \
|
||||
slowlabel: \
|
||||
if ((result=jpeg_huff_decode(&state,get_buffer,bits_left,htbl,nb)) < 0) \
|
||||
{ failaction; } \
|
||||
get_buffer = state.get_buffer; bits_left = state.bits_left; \
|
||||
} \
|
||||
}
|
||||
|
||||
/* Out-of-line case for Huffman code fetching */
|
||||
EXTERN(int) jpeg_huff_decode
|
||||
JPP((bitread_working_state * state, register bit_buf_type get_buffer,
|
||||
register int bits_left, d_derived_tbl * htbl, int min_bits));
|
376
jpeg/jdinput.c
376
jpeg/jdinput.c
@ -2,13 +2,14 @@
|
||||
* jdinput.c
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 2002-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains input control logic for the JPEG decompressor.
|
||||
* These routines are concerned with controlling the decompressor's input
|
||||
* processing (marker reading and coefficient decoding). The actual input
|
||||
* reading is done in jdmarker.c, jdhuff.c, and jdphuff.c.
|
||||
* reading is done in jdmarker.c, jdhuff.c, and jdarith.c.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
@ -21,7 +22,7 @@
|
||||
typedef struct {
|
||||
struct jpeg_input_controller pub; /* public fields */
|
||||
|
||||
boolean inheaders; /* TRUE until first SOS is reached */
|
||||
int inheaders; /* Nonzero until first SOS is reached */
|
||||
} my_input_controller;
|
||||
|
||||
typedef my_input_controller * my_inputctl_ptr;
|
||||
@ -35,6 +36,174 @@ METHODDEF(int) consume_markers JPP((j_decompress_ptr cinfo));
|
||||
* Routines to calculate various quantities related to the size of the image.
|
||||
*/
|
||||
|
||||
|
||||
/*
|
||||
* Compute output image dimensions and related values.
|
||||
* NOTE: this is exported for possible use by application.
|
||||
* Hence it mustn't do anything that can't be done twice.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_core_output_dimensions (j_decompress_ptr cinfo)
|
||||
/* Do computations that are needed before master selection phase.
|
||||
* This function is used for transcoding and full decompression.
|
||||
*/
|
||||
{
|
||||
#ifdef IDCT_SCALING_SUPPORTED
|
||||
int ci;
|
||||
jpeg_component_info *compptr;
|
||||
|
||||
/* Compute actual output image dimensions and DCT scaling choices. */
|
||||
if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom) {
|
||||
/* Provide 1/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 1;
|
||||
cinfo->min_DCT_v_scaled_size = 1;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 2) {
|
||||
/* Provide 2/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 2L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 2L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 2;
|
||||
cinfo->min_DCT_v_scaled_size = 2;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 3) {
|
||||
/* Provide 3/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 3L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 3L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 3;
|
||||
cinfo->min_DCT_v_scaled_size = 3;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 4) {
|
||||
/* Provide 4/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 4L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 4L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 4;
|
||||
cinfo->min_DCT_v_scaled_size = 4;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 5) {
|
||||
/* Provide 5/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 5L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 5L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 5;
|
||||
cinfo->min_DCT_v_scaled_size = 5;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 6) {
|
||||
/* Provide 6/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 6L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 6L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 6;
|
||||
cinfo->min_DCT_v_scaled_size = 6;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 7) {
|
||||
/* Provide 7/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 7L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 7L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 7;
|
||||
cinfo->min_DCT_v_scaled_size = 7;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 8) {
|
||||
/* Provide 8/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 8L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 8L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 8;
|
||||
cinfo->min_DCT_v_scaled_size = 8;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 9) {
|
||||
/* Provide 9/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 9L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 9L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 9;
|
||||
cinfo->min_DCT_v_scaled_size = 9;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 10) {
|
||||
/* Provide 10/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 10L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 10L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 10;
|
||||
cinfo->min_DCT_v_scaled_size = 10;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 11) {
|
||||
/* Provide 11/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 11L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 11L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 11;
|
||||
cinfo->min_DCT_v_scaled_size = 11;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 12) {
|
||||
/* Provide 12/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 12L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 12L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 12;
|
||||
cinfo->min_DCT_v_scaled_size = 12;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 13) {
|
||||
/* Provide 13/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 13L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 13L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 13;
|
||||
cinfo->min_DCT_v_scaled_size = 13;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 14) {
|
||||
/* Provide 14/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 14L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 14L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 14;
|
||||
cinfo->min_DCT_v_scaled_size = 14;
|
||||
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 15) {
|
||||
/* Provide 15/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 15L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 15L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 15;
|
||||
cinfo->min_DCT_v_scaled_size = 15;
|
||||
} else {
|
||||
/* Provide 16/block_size scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * 16L, (long) cinfo->block_size);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * 16L, (long) cinfo->block_size);
|
||||
cinfo->min_DCT_h_scaled_size = 16;
|
||||
cinfo->min_DCT_v_scaled_size = 16;
|
||||
}
|
||||
|
||||
/* Recompute dimensions of components */
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size;
|
||||
compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size;
|
||||
}
|
||||
|
||||
#else /* !IDCT_SCALING_SUPPORTED */
|
||||
|
||||
/* Hardwire it to "no scaling" */
|
||||
cinfo->output_width = cinfo->image_width;
|
||||
cinfo->output_height = cinfo->image_height;
|
||||
/* jdinput.c has already initialized DCT_scaled_size,
|
||||
* and has computed unscaled downsampled_width and downsampled_height.
|
||||
*/
|
||||
|
||||
#endif /* IDCT_SCALING_SUPPORTED */
|
||||
}
|
||||
|
||||
|
||||
LOCAL(void)
|
||||
initial_setup (j_decompress_ptr cinfo)
|
||||
/* Called once, when first SOS marker is reached */
|
||||
@ -70,23 +239,121 @@ initial_setup (j_decompress_ptr cinfo)
|
||||
compptr->v_samp_factor);
|
||||
}
|
||||
|
||||
/* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.
|
||||
* In the full decompressor, this will be overridden by jdmaster.c;
|
||||
* but in the transcoder, jdmaster.c is not used, so we must do it here.
|
||||
/* Derive block_size, natural_order, and lim_Se */
|
||||
if (cinfo->is_baseline || (cinfo->progressive_mode &&
|
||||
cinfo->comps_in_scan)) { /* no pseudo SOS marker */
|
||||
cinfo->block_size = DCTSIZE;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
} else
|
||||
switch (cinfo->Se) {
|
||||
case (1*1-1):
|
||||
cinfo->block_size = 1;
|
||||
cinfo->natural_order = jpeg_natural_order; /* not needed */
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (2*2-1):
|
||||
cinfo->block_size = 2;
|
||||
cinfo->natural_order = jpeg_natural_order2;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (3*3-1):
|
||||
cinfo->block_size = 3;
|
||||
cinfo->natural_order = jpeg_natural_order3;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (4*4-1):
|
||||
cinfo->block_size = 4;
|
||||
cinfo->natural_order = jpeg_natural_order4;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (5*5-1):
|
||||
cinfo->block_size = 5;
|
||||
cinfo->natural_order = jpeg_natural_order5;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (6*6-1):
|
||||
cinfo->block_size = 6;
|
||||
cinfo->natural_order = jpeg_natural_order6;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (7*7-1):
|
||||
cinfo->block_size = 7;
|
||||
cinfo->natural_order = jpeg_natural_order7;
|
||||
cinfo->lim_Se = cinfo->Se;
|
||||
break;
|
||||
case (8*8-1):
|
||||
cinfo->block_size = 8;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (9*9-1):
|
||||
cinfo->block_size = 9;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (10*10-1):
|
||||
cinfo->block_size = 10;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (11*11-1):
|
||||
cinfo->block_size = 11;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (12*12-1):
|
||||
cinfo->block_size = 12;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (13*13-1):
|
||||
cinfo->block_size = 13;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (14*14-1):
|
||||
cinfo->block_size = 14;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (15*15-1):
|
||||
cinfo->block_size = 15;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
case (16*16-1):
|
||||
cinfo->block_size = 16;
|
||||
cinfo->natural_order = jpeg_natural_order;
|
||||
cinfo->lim_Se = DCTSIZE2-1;
|
||||
break;
|
||||
default:
|
||||
ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
|
||||
cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
|
||||
break;
|
||||
}
|
||||
|
||||
/* We initialize DCT_scaled_size and min_DCT_scaled_size to block_size.
|
||||
* In the full decompressor,
|
||||
* this will be overridden by jpeg_calc_output_dimensions in jdmaster.c;
|
||||
* but in the transcoder,
|
||||
* jpeg_calc_output_dimensions is not used, so we must do it here.
|
||||
*/
|
||||
cinfo->min_DCT_scaled_size = DCTSIZE;
|
||||
cinfo->min_DCT_h_scaled_size = cinfo->block_size;
|
||||
cinfo->min_DCT_v_scaled_size = cinfo->block_size;
|
||||
|
||||
/* Compute dimensions of components */
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
compptr->DCT_scaled_size = DCTSIZE;
|
||||
compptr->DCT_h_scaled_size = cinfo->block_size;
|
||||
compptr->DCT_v_scaled_size = cinfo->block_size;
|
||||
/* Size in DCT blocks */
|
||||
compptr->width_in_blocks = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
|
||||
(long) (cinfo->max_h_samp_factor * DCTSIZE));
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
compptr->height_in_blocks = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
|
||||
(long) (cinfo->max_v_samp_factor * DCTSIZE));
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
/* downsampled_width and downsampled_height will also be overridden by
|
||||
* jdmaster.c if we are doing full decompression. The transcoder library
|
||||
* doesn't use these values, but the calling application might.
|
||||
@ -107,7 +374,7 @@ initial_setup (j_decompress_ptr cinfo)
|
||||
/* Compute number of fully interleaved MCU rows. */
|
||||
cinfo->total_iMCU_rows = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height,
|
||||
(long) (cinfo->max_v_samp_factor*DCTSIZE));
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
|
||||
/* Decide whether file contains multiple scans */
|
||||
if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)
|
||||
@ -138,7 +405,7 @@ per_scan_setup (j_decompress_ptr cinfo)
|
||||
compptr->MCU_width = 1;
|
||||
compptr->MCU_height = 1;
|
||||
compptr->MCU_blocks = 1;
|
||||
compptr->MCU_sample_width = compptr->DCT_scaled_size;
|
||||
compptr->MCU_sample_width = compptr->DCT_h_scaled_size;
|
||||
compptr->last_col_width = 1;
|
||||
/* For noninterleaved scans, it is convenient to define last_row_height
|
||||
* as the number of block rows present in the last iMCU row.
|
||||
@ -161,10 +428,10 @@ per_scan_setup (j_decompress_ptr cinfo)
|
||||
/* Overall image size in MCUs */
|
||||
cinfo->MCUs_per_row = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width,
|
||||
(long) (cinfo->max_h_samp_factor*DCTSIZE));
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
cinfo->MCU_rows_in_scan = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height,
|
||||
(long) (cinfo->max_v_samp_factor*DCTSIZE));
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
|
||||
cinfo->blocks_in_MCU = 0;
|
||||
|
||||
@ -174,7 +441,7 @@ per_scan_setup (j_decompress_ptr cinfo)
|
||||
compptr->MCU_width = compptr->h_samp_factor;
|
||||
compptr->MCU_height = compptr->v_samp_factor;
|
||||
compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
|
||||
compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_scaled_size;
|
||||
compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_h_scaled_size;
|
||||
/* Figure number of non-dummy blocks in last MCU column & row */
|
||||
tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
|
||||
if (tmp == 0) tmp = compptr->MCU_width;
|
||||
@ -282,6 +549,10 @@ finish_input_pass (j_decompress_ptr cinfo)
|
||||
* The consume_input method pointer points either here or to the
|
||||
* coefficient controller's consume_data routine, depending on whether
|
||||
* we are reading a compressed data segment or inter-segment markers.
|
||||
*
|
||||
* Note: This function should NOT return a pseudo SOS marker (with zero
|
||||
* component number) to the caller. A pseudo marker received by
|
||||
* read_markers is processed and then skipped for other markers.
|
||||
*/
|
||||
|
||||
METHODDEF(int)
|
||||
@ -293,41 +564,50 @@ consume_markers (j_decompress_ptr cinfo)
|
||||
if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */
|
||||
return JPEG_REACHED_EOI;
|
||||
|
||||
val = (*cinfo->marker->read_markers) (cinfo);
|
||||
for (;;) { /* Loop to pass pseudo SOS marker */
|
||||
val = (*cinfo->marker->read_markers) (cinfo);
|
||||
|
||||
switch (val) {
|
||||
case JPEG_REACHED_SOS: /* Found SOS */
|
||||
if (inputctl->inheaders) { /* 1st SOS */
|
||||
initial_setup(cinfo);
|
||||
inputctl->inheaders = FALSE;
|
||||
/* Note: start_input_pass must be called by jdmaster.c
|
||||
* before any more input can be consumed. jdapimin.c is
|
||||
* responsible for enforcing this sequencing.
|
||||
*/
|
||||
} else { /* 2nd or later SOS marker */
|
||||
if (! inputctl->pub.has_multiple_scans)
|
||||
ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */
|
||||
start_input_pass(cinfo);
|
||||
switch (val) {
|
||||
case JPEG_REACHED_SOS: /* Found SOS */
|
||||
if (inputctl->inheaders) { /* 1st SOS */
|
||||
if (inputctl->inheaders == 1)
|
||||
initial_setup(cinfo);
|
||||
if (cinfo->comps_in_scan == 0) { /* pseudo SOS marker */
|
||||
inputctl->inheaders = 2;
|
||||
break;
|
||||
}
|
||||
inputctl->inheaders = 0;
|
||||
/* Note: start_input_pass must be called by jdmaster.c
|
||||
* before any more input can be consumed. jdapimin.c is
|
||||
* responsible for enforcing this sequencing.
|
||||
*/
|
||||
} else { /* 2nd or later SOS marker */
|
||||
if (! inputctl->pub.has_multiple_scans)
|
||||
ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */
|
||||
if (cinfo->comps_in_scan == 0) /* unexpected pseudo SOS marker */
|
||||
break;
|
||||
start_input_pass(cinfo);
|
||||
}
|
||||
return val;
|
||||
case JPEG_REACHED_EOI: /* Found EOI */
|
||||
inputctl->pub.eoi_reached = TRUE;
|
||||
if (inputctl->inheaders) { /* Tables-only datastream, apparently */
|
||||
if (cinfo->marker->saw_SOF)
|
||||
ERREXIT(cinfo, JERR_SOF_NO_SOS);
|
||||
} else {
|
||||
/* Prevent infinite loop in coef ctlr's decompress_data routine
|
||||
* if user set output_scan_number larger than number of scans.
|
||||
*/
|
||||
if (cinfo->output_scan_number > cinfo->input_scan_number)
|
||||
cinfo->output_scan_number = cinfo->input_scan_number;
|
||||
}
|
||||
return val;
|
||||
case JPEG_SUSPENDED:
|
||||
return val;
|
||||
default:
|
||||
return val;
|
||||
}
|
||||
break;
|
||||
case JPEG_REACHED_EOI: /* Found EOI */
|
||||
inputctl->pub.eoi_reached = TRUE;
|
||||
if (inputctl->inheaders) { /* Tables-only datastream, apparently */
|
||||
if (cinfo->marker->saw_SOF)
|
||||
ERREXIT(cinfo, JERR_SOF_NO_SOS);
|
||||
} else {
|
||||
/* Prevent infinite loop in coef ctlr's decompress_data routine
|
||||
* if user set output_scan_number larger than number of scans.
|
||||
*/
|
||||
if (cinfo->output_scan_number > cinfo->input_scan_number)
|
||||
cinfo->output_scan_number = cinfo->input_scan_number;
|
||||
}
|
||||
break;
|
||||
case JPEG_SUSPENDED:
|
||||
break;
|
||||
}
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
|
||||
@ -343,7 +623,7 @@ reset_input_controller (j_decompress_ptr cinfo)
|
||||
inputctl->pub.consume_input = consume_markers;
|
||||
inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
|
||||
inputctl->pub.eoi_reached = FALSE;
|
||||
inputctl->inheaders = TRUE;
|
||||
inputctl->inheaders = 1;
|
||||
/* Reset other modules */
|
||||
(*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
|
||||
(*cinfo->marker->reset_marker_reader) (cinfo);
|
||||
@ -377,5 +657,5 @@ jinit_input_controller (j_decompress_ptr cinfo)
|
||||
*/
|
||||
inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
|
||||
inputctl->pub.eoi_reached = FALSE;
|
||||
inputctl->inheaders = TRUE;
|
||||
inputctl->inheaders = 1;
|
||||
}
|
||||
|
160
jpeg/jdmainct.c
160
jpeg/jdmainct.c
@ -159,24 +159,24 @@ alloc_funny_pointers (j_decompress_ptr cinfo)
|
||||
* This is done only once, not once per pass.
|
||||
*/
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
int ci, rgroup;
|
||||
int M = cinfo->min_DCT_scaled_size;
|
||||
int M = cinfo->min_DCT_v_scaled_size;
|
||||
jpeg_component_info *compptr;
|
||||
JSAMPARRAY xbuf;
|
||||
|
||||
/* Get top-level space for component array pointers.
|
||||
* We alloc both arrays with one call to save a few cycles.
|
||||
*/
|
||||
jmain->xbuffer[0] = (JSAMPIMAGE)
|
||||
main->xbuffer[0] = (JSAMPIMAGE)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
cinfo->num_components * 2 * SIZEOF(JSAMPARRAY));
|
||||
jmain->xbuffer[1] = jmain->xbuffer[0] + cinfo->num_components;
|
||||
main->xbuffer[1] = main->xbuffer[0] + cinfo->num_components;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size; /* height of a row group of component */
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size; /* height of a row group of component */
|
||||
/* Get space for pointer lists --- M+4 row groups in each list.
|
||||
* We alloc both pointer lists with one call to save a few cycles.
|
||||
*/
|
||||
@ -184,9 +184,9 @@ alloc_funny_pointers (j_decompress_ptr cinfo)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW));
|
||||
xbuf += rgroup; /* want one row group at negative offsets */
|
||||
jmain->xbuffer[0][ci] = xbuf;
|
||||
main->xbuffer[0][ci] = xbuf;
|
||||
xbuf += rgroup * (M + 4);
|
||||
jmain->xbuffer[1][ci] = xbuf;
|
||||
main->xbuffer[1][ci] = xbuf;
|
||||
}
|
||||
}
|
||||
|
||||
@ -194,26 +194,26 @@ alloc_funny_pointers (j_decompress_ptr cinfo)
|
||||
LOCAL(void)
|
||||
make_funny_pointers (j_decompress_ptr cinfo)
|
||||
/* Create the funny pointer lists discussed in the comments above.
|
||||
* The actual workspace is already allocated (in jmain->buffer),
|
||||
* The actual workspace is already allocated (in main->buffer),
|
||||
* and the space for the pointer lists is allocated too.
|
||||
* This routine just fills in the curiously ordered lists.
|
||||
* This will be repeated at the beginning of each pass.
|
||||
*/
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
int ci, i, rgroup;
|
||||
int M = cinfo->min_DCT_scaled_size;
|
||||
int M = cinfo->min_DCT_v_scaled_size;
|
||||
jpeg_component_info *compptr;
|
||||
JSAMPARRAY buf, xbuf0, xbuf1;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size; /* height of a row group of component */
|
||||
xbuf0 = jmain->xbuffer[0][ci];
|
||||
xbuf1 = jmain->xbuffer[1][ci];
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size; /* height of a row group of component */
|
||||
xbuf0 = main->xbuffer[0][ci];
|
||||
xbuf1 = main->xbuffer[1][ci];
|
||||
/* First copy the workspace pointers as-is */
|
||||
buf = jmain->buffer[ci];
|
||||
buf = main->buffer[ci];
|
||||
for (i = 0; i < rgroup * (M + 2); i++) {
|
||||
xbuf0[i] = xbuf1[i] = buf[i];
|
||||
}
|
||||
@ -240,18 +240,18 @@ set_wraparound_pointers (j_decompress_ptr cinfo)
|
||||
* This changes the pointer list state from top-of-image to the normal state.
|
||||
*/
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
int ci, i, rgroup;
|
||||
int M = cinfo->min_DCT_scaled_size;
|
||||
int M = cinfo->min_DCT_v_scaled_size;
|
||||
jpeg_component_info *compptr;
|
||||
JSAMPARRAY xbuf0, xbuf1;
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size; /* height of a row group of component */
|
||||
xbuf0 = jmain->xbuffer[0][ci];
|
||||
xbuf1 = jmain->xbuffer[1][ci];
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size; /* height of a row group of component */
|
||||
xbuf0 = main->xbuffer[0][ci];
|
||||
xbuf1 = main->xbuffer[1][ci];
|
||||
for (i = 0; i < rgroup; i++) {
|
||||
xbuf0[i - rgroup] = xbuf0[rgroup*(M+1) + i];
|
||||
xbuf1[i - rgroup] = xbuf1[rgroup*(M+1) + i];
|
||||
@ -269,7 +269,7 @@ set_bottom_pointers (j_decompress_ptr cinfo)
|
||||
* Also sets rowgroups_avail to indicate number of nondummy row groups in row.
|
||||
*/
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
int ci, i, rgroup, iMCUheight, rows_left;
|
||||
jpeg_component_info *compptr;
|
||||
JSAMPARRAY xbuf;
|
||||
@ -277,8 +277,8 @@ set_bottom_pointers (j_decompress_ptr cinfo)
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
/* Count sample rows in one iMCU row and in one row group */
|
||||
iMCUheight = compptr->v_samp_factor * compptr->DCT_scaled_size;
|
||||
rgroup = iMCUheight / cinfo->min_DCT_scaled_size;
|
||||
iMCUheight = compptr->v_samp_factor * compptr->DCT_v_scaled_size;
|
||||
rgroup = iMCUheight / cinfo->min_DCT_v_scaled_size;
|
||||
/* Count nondummy sample rows remaining for this component */
|
||||
rows_left = (int) (compptr->downsampled_height % (JDIMENSION) iMCUheight);
|
||||
if (rows_left == 0) rows_left = iMCUheight;
|
||||
@ -286,12 +286,12 @@ set_bottom_pointers (j_decompress_ptr cinfo)
|
||||
* so we need only do it once.
|
||||
*/
|
||||
if (ci == 0) {
|
||||
jmain->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1);
|
||||
main->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1);
|
||||
}
|
||||
/* Duplicate the last real sample row rgroup*2 times; this pads out the
|
||||
* last partial rowgroup and ensures at least one full rowgroup of context.
|
||||
*/
|
||||
xbuf = jmain->xbuffer[jmain->whichptr][ci];
|
||||
xbuf = main->xbuffer[main->whichptr][ci];
|
||||
for (i = 0; i < rgroup * 2; i++) {
|
||||
xbuf[rows_left + i] = xbuf[rows_left-1];
|
||||
}
|
||||
@ -306,27 +306,27 @@ set_bottom_pointers (j_decompress_ptr cinfo)
|
||||
METHODDEF(void)
|
||||
start_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
|
||||
switch (pass_mode) {
|
||||
case JBUF_PASS_THRU:
|
||||
if (cinfo->upsample->need_context_rows) {
|
||||
jmain->pub.process_data = process_data_context_main;
|
||||
main->pub.process_data = process_data_context_main;
|
||||
make_funny_pointers(cinfo); /* Create the xbuffer[] lists */
|
||||
jmain->whichptr = 0; /* Read first iMCU row into xbuffer[0] */
|
||||
jmain->context_state = CTX_PREPARE_FOR_IMCU;
|
||||
jmain->iMCU_row_ctr = 0;
|
||||
main->whichptr = 0; /* Read first iMCU row into xbuffer[0] */
|
||||
main->context_state = CTX_PREPARE_FOR_IMCU;
|
||||
main->iMCU_row_ctr = 0;
|
||||
} else {
|
||||
/* Simple case with no context needed */
|
||||
jmain->pub.process_data = process_data_simple_main;
|
||||
main->pub.process_data = process_data_simple_main;
|
||||
}
|
||||
jmain->buffer_full = FALSE; /* Mark buffer empty */
|
||||
jmain->rowgroup_ctr = 0;
|
||||
main->buffer_full = FALSE; /* Mark buffer empty */
|
||||
main->rowgroup_ctr = 0;
|
||||
break;
|
||||
#ifdef QUANT_2PASS_SUPPORTED
|
||||
case JBUF_CRANK_DEST:
|
||||
/* For last pass of 2-pass quantization, just crank the postprocessor */
|
||||
jmain->pub.process_data = process_data_crank_post;
|
||||
main->pub.process_data = process_data_crank_post;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
@ -346,32 +346,32 @@ process_data_simple_main (j_decompress_ptr cinfo,
|
||||
JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
|
||||
JDIMENSION out_rows_avail)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
JDIMENSION rowgroups_avail;
|
||||
|
||||
/* Read input data if we haven't filled the main buffer yet */
|
||||
if (! jmain->buffer_full) {
|
||||
if (! (*cinfo->coef->decompress_data) (cinfo, jmain->buffer))
|
||||
if (! main->buffer_full) {
|
||||
if (! (*cinfo->coef->decompress_data) (cinfo, main->buffer))
|
||||
return; /* suspension forced, can do nothing more */
|
||||
jmain->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
||||
main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
||||
}
|
||||
|
||||
/* There are always min_DCT_scaled_size row groups in an iMCU row. */
|
||||
rowgroups_avail = (JDIMENSION) cinfo->min_DCT_scaled_size;
|
||||
rowgroups_avail = (JDIMENSION) cinfo->min_DCT_v_scaled_size;
|
||||
/* Note: at the bottom of the image, we may pass extra garbage row groups
|
||||
* to the postprocessor. The postprocessor has to check for bottom
|
||||
* of image anyway (at row resolution), so no point in us doing it too.
|
||||
*/
|
||||
|
||||
/* Feed the postprocessor */
|
||||
(*cinfo->post->post_process_data) (cinfo, jmain->buffer,
|
||||
&jmain->rowgroup_ctr, rowgroups_avail,
|
||||
(*cinfo->post->post_process_data) (cinfo, main->buffer,
|
||||
&main->rowgroup_ctr, rowgroups_avail,
|
||||
output_buf, out_row_ctr, out_rows_avail);
|
||||
|
||||
/* Has postprocessor consumed all the data yet? If so, mark buffer empty */
|
||||
if (jmain->rowgroup_ctr >= rowgroups_avail) {
|
||||
jmain->buffer_full = FALSE;
|
||||
jmain->rowgroup_ctr = 0;
|
||||
if (main->rowgroup_ctr >= rowgroups_avail) {
|
||||
main->buffer_full = FALSE;
|
||||
main->rowgroup_ctr = 0;
|
||||
}
|
||||
}
|
||||
|
||||
@ -386,15 +386,15 @@ process_data_context_main (j_decompress_ptr cinfo,
|
||||
JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
|
||||
JDIMENSION out_rows_avail)
|
||||
{
|
||||
my_main_ptr jmain = (my_main_ptr) cinfo->main;
|
||||
my_main_ptr main = (my_main_ptr) cinfo->main;
|
||||
|
||||
/* Read input data if we haven't filled the main buffer yet */
|
||||
if (! jmain->buffer_full) {
|
||||
if (! main->buffer_full) {
|
||||
if (! (*cinfo->coef->decompress_data) (cinfo,
|
||||
jmain->xbuffer[jmain->whichptr]))
|
||||
main->xbuffer[main->whichptr]))
|
||||
return; /* suspension forced, can do nothing more */
|
||||
jmain->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
||||
jmain->iMCU_row_ctr++; /* count rows received */
|
||||
main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
||||
main->iMCU_row_ctr++; /* count rows received */
|
||||
}
|
||||
|
||||
/* Postprocessor typically will not swallow all the input data it is handed
|
||||
@ -402,47 +402,47 @@ process_data_context_main (j_decompress_ptr cinfo,
|
||||
* to exit and restart. This switch lets us keep track of how far we got.
|
||||
* Note that each case falls through to the next on successful completion.
|
||||
*/
|
||||
switch (jmain->context_state) {
|
||||
switch (main->context_state) {
|
||||
case CTX_POSTPONED_ROW:
|
||||
/* Call postprocessor using previously set pointers for postponed row */
|
||||
(*cinfo->post->post_process_data) (cinfo, jmain->xbuffer[jmain->whichptr],
|
||||
&jmain->rowgroup_ctr, jmain->rowgroups_avail,
|
||||
(*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr],
|
||||
&main->rowgroup_ctr, main->rowgroups_avail,
|
||||
output_buf, out_row_ctr, out_rows_avail);
|
||||
if (jmain->rowgroup_ctr < jmain->rowgroups_avail)
|
||||
if (main->rowgroup_ctr < main->rowgroups_avail)
|
||||
return; /* Need to suspend */
|
||||
jmain->context_state = CTX_PREPARE_FOR_IMCU;
|
||||
main->context_state = CTX_PREPARE_FOR_IMCU;
|
||||
if (*out_row_ctr >= out_rows_avail)
|
||||
return; /* Postprocessor exactly filled output buf */
|
||||
/*FALLTHROUGH*/
|
||||
case CTX_PREPARE_FOR_IMCU:
|
||||
/* Prepare to process first M-1 row groups of this iMCU row */
|
||||
jmain->rowgroup_ctr = 0;
|
||||
jmain->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size - 1);
|
||||
main->rowgroup_ctr = 0;
|
||||
main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_v_scaled_size - 1);
|
||||
/* Check for bottom of image: if so, tweak pointers to "duplicate"
|
||||
* the last sample row, and adjust rowgroups_avail to ignore padding rows.
|
||||
*/
|
||||
if (jmain->iMCU_row_ctr == cinfo->total_iMCU_rows)
|
||||
if (main->iMCU_row_ctr == cinfo->total_iMCU_rows)
|
||||
set_bottom_pointers(cinfo);
|
||||
jmain->context_state = CTX_PROCESS_IMCU;
|
||||
main->context_state = CTX_PROCESS_IMCU;
|
||||
/*FALLTHROUGH*/
|
||||
case CTX_PROCESS_IMCU:
|
||||
/* Call postprocessor using previously set pointers */
|
||||
(*cinfo->post->post_process_data) (cinfo, jmain->xbuffer[jmain->whichptr],
|
||||
&jmain->rowgroup_ctr, jmain->rowgroups_avail,
|
||||
(*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr],
|
||||
&main->rowgroup_ctr, main->rowgroups_avail,
|
||||
output_buf, out_row_ctr, out_rows_avail);
|
||||
if (jmain->rowgroup_ctr < jmain->rowgroups_avail)
|
||||
if (main->rowgroup_ctr < main->rowgroups_avail)
|
||||
return; /* Need to suspend */
|
||||
/* After the first iMCU, change wraparound pointers to normal state */
|
||||
if (jmain->iMCU_row_ctr == 1)
|
||||
if (main->iMCU_row_ctr == 1)
|
||||
set_wraparound_pointers(cinfo);
|
||||
/* Prepare to load new iMCU row using other xbuffer list */
|
||||
jmain->whichptr ^= 1; /* 0=>1 or 1=>0 */
|
||||
jmain->buffer_full = FALSE;
|
||||
main->whichptr ^= 1; /* 0=>1 or 1=>0 */
|
||||
main->buffer_full = FALSE;
|
||||
/* Still need to process last row group of this iMCU row, */
|
||||
/* which is saved at index M+1 of the other xbuffer */
|
||||
jmain->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_scaled_size + 1);
|
||||
jmain->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size + 2);
|
||||
jmain->context_state = CTX_POSTPONED_ROW;
|
||||
main->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_v_scaled_size + 1);
|
||||
main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_v_scaled_size + 2);
|
||||
main->context_state = CTX_POSTPONED_ROW;
|
||||
}
|
||||
}
|
||||
|
||||
@ -475,15 +475,15 @@ process_data_crank_post (j_decompress_ptr cinfo,
|
||||
GLOBAL(void)
|
||||
jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
|
||||
{
|
||||
my_main_ptr jmain;
|
||||
my_main_ptr main;
|
||||
int ci, rgroup, ngroups;
|
||||
jpeg_component_info *compptr;
|
||||
|
||||
jmain = (my_main_ptr)
|
||||
main = (my_main_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(my_main_controller));
|
||||
cinfo->main = (struct jpeg_d_main_controller *) jmain;
|
||||
jmain->pub.start_pass = start_pass_main;
|
||||
cinfo->main = (struct jpeg_d_main_controller *) main;
|
||||
main->pub.start_pass = start_pass_main;
|
||||
|
||||
if (need_full_buffer) /* shouldn't happen */
|
||||
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||||
@ -492,21 +492,21 @@ jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
|
||||
* ngroups is the number of row groups we need.
|
||||
*/
|
||||
if (cinfo->upsample->need_context_rows) {
|
||||
if (cinfo->min_DCT_scaled_size < 2) /* unsupported, see comments above */
|
||||
if (cinfo->min_DCT_v_scaled_size < 2) /* unsupported, see comments above */
|
||||
ERREXIT(cinfo, JERR_NOTIMPL);
|
||||
alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */
|
||||
ngroups = cinfo->min_DCT_scaled_size + 2;
|
||||
ngroups = cinfo->min_DCT_v_scaled_size + 2;
|
||||
} else {
|
||||
ngroups = cinfo->min_DCT_scaled_size;
|
||||
ngroups = cinfo->min_DCT_v_scaled_size;
|
||||
}
|
||||
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size; /* height of a row group of component */
|
||||
jmain->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
||||
rgroup = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size; /* height of a row group of component */
|
||||
main->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
compptr->width_in_blocks * compptr->DCT_scaled_size,
|
||||
compptr->width_in_blocks * compptr->DCT_h_scaled_size,
|
||||
(JDIMENSION) (rgroup * ngroups));
|
||||
}
|
||||
}
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jdmarker.c
|
||||
*
|
||||
* Copyright (C) 1991-1998, Thomas G. Lane.
|
||||
* Modified 2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -234,7 +235,8 @@ get_soi (j_decompress_ptr cinfo)
|
||||
|
||||
|
||||
LOCAL(boolean)
|
||||
get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
|
||||
get_sof (j_decompress_ptr cinfo, boolean is_baseline, boolean is_prog,
|
||||
boolean is_arith)
|
||||
/* Process a SOFn marker */
|
||||
{
|
||||
INT32 length;
|
||||
@ -242,6 +244,7 @@ get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
|
||||
jpeg_component_info * compptr;
|
||||
INPUT_VARS(cinfo);
|
||||
|
||||
cinfo->is_baseline = is_baseline;
|
||||
cinfo->progressive_mode = is_prog;
|
||||
cinfo->arith_code = is_arith;
|
||||
|
||||
@ -315,7 +318,9 @@ get_sos (j_decompress_ptr cinfo)
|
||||
|
||||
TRACEMS1(cinfo, 1, JTRC_SOS, n);
|
||||
|
||||
if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN)
|
||||
if (length != (n * 2 + 6) || n > MAX_COMPS_IN_SCAN ||
|
||||
(n == 0 && !cinfo->progressive_mode))
|
||||
/* pseudo SOS marker only allowed in progressive mode */
|
||||
ERREXIT(cinfo, JERR_BAD_LENGTH);
|
||||
|
||||
cinfo->comps_in_scan = n;
|
||||
@ -359,8 +364,8 @@ get_sos (j_decompress_ptr cinfo)
|
||||
/* Prepare to scan data & restart markers */
|
||||
cinfo->marker->next_restart_num = 0;
|
||||
|
||||
/* Count another SOS marker */
|
||||
cinfo->input_scan_number++;
|
||||
/* Count another (non-pseudo) SOS marker */
|
||||
if (n) cinfo->input_scan_number++;
|
||||
|
||||
INPUT_SYNC(cinfo);
|
||||
return TRUE;
|
||||
@ -490,16 +495,18 @@ LOCAL(boolean)
|
||||
get_dqt (j_decompress_ptr cinfo)
|
||||
/* Process a DQT marker */
|
||||
{
|
||||
INT32 length;
|
||||
int n, i, prec;
|
||||
INT32 length, count, i;
|
||||
int n, prec;
|
||||
unsigned int tmp;
|
||||
JQUANT_TBL *quant_ptr;
|
||||
const int *natural_order;
|
||||
INPUT_VARS(cinfo);
|
||||
|
||||
INPUT_2BYTES(cinfo, length, return FALSE);
|
||||
length -= 2;
|
||||
|
||||
while (length > 0) {
|
||||
length--;
|
||||
INPUT_BYTE(cinfo, n, return FALSE);
|
||||
prec = n >> 4;
|
||||
n &= 0x0F;
|
||||
@ -513,13 +520,43 @@ get_dqt (j_decompress_ptr cinfo)
|
||||
cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo);
|
||||
quant_ptr = cinfo->quant_tbl_ptrs[n];
|
||||
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
if (prec) {
|
||||
if (length < DCTSIZE2 * 2) {
|
||||
/* Initialize full table for safety. */
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
quant_ptr->quantval[i] = 1;
|
||||
}
|
||||
count = length >> 1;
|
||||
} else
|
||||
count = DCTSIZE2;
|
||||
} else {
|
||||
if (length < DCTSIZE2) {
|
||||
/* Initialize full table for safety. */
|
||||
for (i = 0; i < DCTSIZE2; i++) {
|
||||
quant_ptr->quantval[i] = 1;
|
||||
}
|
||||
count = length;
|
||||
} else
|
||||
count = DCTSIZE2;
|
||||
}
|
||||
|
||||
switch (count) {
|
||||
case (2*2): natural_order = jpeg_natural_order2; break;
|
||||
case (3*3): natural_order = jpeg_natural_order3; break;
|
||||
case (4*4): natural_order = jpeg_natural_order4; break;
|
||||
case (5*5): natural_order = jpeg_natural_order5; break;
|
||||
case (6*6): natural_order = jpeg_natural_order6; break;
|
||||
case (7*7): natural_order = jpeg_natural_order7; break;
|
||||
default: natural_order = jpeg_natural_order; break;
|
||||
}
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
if (prec)
|
||||
INPUT_2BYTES(cinfo, tmp, return FALSE);
|
||||
else
|
||||
INPUT_BYTE(cinfo, tmp, return FALSE);
|
||||
/* We convert the zigzag-order table to natural array order. */
|
||||
quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp;
|
||||
quant_ptr->quantval[natural_order[i]] = (UINT16) tmp;
|
||||
}
|
||||
|
||||
if (cinfo->err->trace_level >= 2) {
|
||||
@ -532,8 +569,8 @@ get_dqt (j_decompress_ptr cinfo)
|
||||
}
|
||||
}
|
||||
|
||||
length -= DCTSIZE2+1;
|
||||
if (prec) length -= DCTSIZE2;
|
||||
length -= count;
|
||||
if (prec) length -= count;
|
||||
}
|
||||
|
||||
if (length != 0)
|
||||
@ -946,6 +983,11 @@ first_marker (j_decompress_ptr cinfo)
|
||||
*
|
||||
* Returns same codes as are defined for jpeg_consume_input:
|
||||
* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
|
||||
*
|
||||
* Note: This function may return a pseudo SOS marker (with zero
|
||||
* component number) for treat by input controller's consume_input.
|
||||
* consume_input itself should filter out (skip) the pseudo marker
|
||||
* after processing for the caller.
|
||||
*/
|
||||
|
||||
METHODDEF(int)
|
||||
@ -975,23 +1017,27 @@ read_markers (j_decompress_ptr cinfo)
|
||||
break;
|
||||
|
||||
case M_SOF0: /* Baseline */
|
||||
if (! get_sof(cinfo, TRUE, FALSE, FALSE))
|
||||
return JPEG_SUSPENDED;
|
||||
break;
|
||||
|
||||
case M_SOF1: /* Extended sequential, Huffman */
|
||||
if (! get_sof(cinfo, FALSE, FALSE))
|
||||
if (! get_sof(cinfo, FALSE, FALSE, FALSE))
|
||||
return JPEG_SUSPENDED;
|
||||
break;
|
||||
|
||||
case M_SOF2: /* Progressive, Huffman */
|
||||
if (! get_sof(cinfo, TRUE, FALSE))
|
||||
if (! get_sof(cinfo, FALSE, TRUE, FALSE))
|
||||
return JPEG_SUSPENDED;
|
||||
break;
|
||||
|
||||
case M_SOF9: /* Extended sequential, arithmetic */
|
||||
if (! get_sof(cinfo, FALSE, TRUE))
|
||||
if (! get_sof(cinfo, FALSE, FALSE, TRUE))
|
||||
return JPEG_SUSPENDED;
|
||||
break;
|
||||
|
||||
case M_SOF10: /* Progressive, arithmetic */
|
||||
if (! get_sof(cinfo, TRUE, TRUE))
|
||||
if (! get_sof(cinfo, FALSE, TRUE, TRUE))
|
||||
return JPEG_SUSPENDED;
|
||||
break;
|
||||
|
||||
|
104
jpeg/jdmaster.c
104
jpeg/jdmaster.c
@ -2,6 +2,7 @@
|
||||
* jdmaster.c
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 2002-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -61,9 +62,12 @@ use_merged_upsample (j_decompress_ptr cinfo)
|
||||
cinfo->comp_info[2].v_samp_factor != 1)
|
||||
return FALSE;
|
||||
/* furthermore, it doesn't work if we've scaled the IDCTs differently */
|
||||
if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
|
||||
cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
|
||||
cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size)
|
||||
if (cinfo->comp_info[0].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size ||
|
||||
cinfo->comp_info[1].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size ||
|
||||
cinfo->comp_info[2].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size ||
|
||||
cinfo->comp_info[0].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size ||
|
||||
cinfo->comp_info[1].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size ||
|
||||
cinfo->comp_info[2].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size)
|
||||
return FALSE;
|
||||
/* ??? also need to test for upsample-time rescaling, when & if supported */
|
||||
return TRUE; /* by golly, it'll work... */
|
||||
@ -82,7 +86,9 @@ use_merged_upsample (j_decompress_ptr cinfo)
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
|
||||
/* Do computations that are needed before master selection phase */
|
||||
/* Do computations that are needed before master selection phase.
|
||||
* This function is used for full decompression.
|
||||
*/
|
||||
{
|
||||
#ifdef IDCT_SCALING_SUPPORTED
|
||||
int ci;
|
||||
@ -93,52 +99,38 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
|
||||
if (cinfo->global_state != DSTATE_READY)
|
||||
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
||||
|
||||
/* Compute core output image dimensions and DCT scaling choices. */
|
||||
jpeg_core_output_dimensions(cinfo);
|
||||
|
||||
#ifdef IDCT_SCALING_SUPPORTED
|
||||
|
||||
/* Compute actual output image dimensions and DCT scaling choices. */
|
||||
if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
|
||||
/* Provide 1/8 scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 8L);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 8L);
|
||||
cinfo->min_DCT_scaled_size = 1;
|
||||
} else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
|
||||
/* Provide 1/4 scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 4L);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 4L);
|
||||
cinfo->min_DCT_scaled_size = 2;
|
||||
} else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
|
||||
/* Provide 1/2 scaling */
|
||||
cinfo->output_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width, 2L);
|
||||
cinfo->output_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height, 2L);
|
||||
cinfo->min_DCT_scaled_size = 4;
|
||||
} else {
|
||||
/* Provide 1/1 scaling */
|
||||
cinfo->output_width = cinfo->image_width;
|
||||
cinfo->output_height = cinfo->image_height;
|
||||
cinfo->min_DCT_scaled_size = DCTSIZE;
|
||||
}
|
||||
/* In selecting the actual DCT scaling for each component, we try to
|
||||
* scale up the chroma components via IDCT scaling rather than upsampling.
|
||||
* This saves time if the upsampler gets to use 1:1 scaling.
|
||||
* Note this code assumes that the supported DCT scalings are powers of 2.
|
||||
* Note this code adapts subsampling ratios which are powers of 2.
|
||||
*/
|
||||
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||||
ci++, compptr++) {
|
||||
int ssize = cinfo->min_DCT_scaled_size;
|
||||
while (ssize < DCTSIZE &&
|
||||
(compptr->h_samp_factor * ssize * 2 <=
|
||||
cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) &&
|
||||
(compptr->v_samp_factor * ssize * 2 <=
|
||||
cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) {
|
||||
int ssize = 1;
|
||||
while (cinfo->min_DCT_h_scaled_size * ssize <=
|
||||
(cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) &&
|
||||
(cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) {
|
||||
ssize = ssize * 2;
|
||||
}
|
||||
compptr->DCT_scaled_size = ssize;
|
||||
compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize;
|
||||
ssize = 1;
|
||||
while (cinfo->min_DCT_v_scaled_size * ssize <=
|
||||
(cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) &&
|
||||
(cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) {
|
||||
ssize = ssize * 2;
|
||||
}
|
||||
compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize;
|
||||
|
||||
/* We don't support IDCT ratios larger than 2. */
|
||||
if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2)
|
||||
compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2;
|
||||
else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2)
|
||||
compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2;
|
||||
}
|
||||
|
||||
/* Recompute downsampled dimensions of components;
|
||||
@ -149,23 +141,14 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
|
||||
/* Size in samples, after IDCT scaling */
|
||||
compptr->downsampled_width = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_width *
|
||||
(long) (compptr->h_samp_factor * compptr->DCT_scaled_size),
|
||||
(long) (cinfo->max_h_samp_factor * DCTSIZE));
|
||||
(long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
|
||||
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
|
||||
compptr->downsampled_height = (JDIMENSION)
|
||||
jdiv_round_up((long) cinfo->image_height *
|
||||
(long) (compptr->v_samp_factor * compptr->DCT_scaled_size),
|
||||
(long) (cinfo->max_v_samp_factor * DCTSIZE));
|
||||
(long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
|
||||
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
|
||||
}
|
||||
|
||||
#else /* !IDCT_SCALING_SUPPORTED */
|
||||
|
||||
/* Hardwire it to "no scaling" */
|
||||
cinfo->output_width = cinfo->image_width;
|
||||
cinfo->output_height = cinfo->image_height;
|
||||
/* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
|
||||
* and has computed unscaled downsampled_width and downsampled_height.
|
||||
*/
|
||||
|
||||
#endif /* IDCT_SCALING_SUPPORTED */
|
||||
|
||||
/* Report number of components in selected colorspace. */
|
||||
@ -372,17 +355,10 @@ master_selection (j_decompress_ptr cinfo)
|
||||
/* Inverse DCT */
|
||||
jinit_inverse_dct(cinfo);
|
||||
/* Entropy decoding: either Huffman or arithmetic coding. */
|
||||
if (cinfo->arith_code) {
|
||||
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
|
||||
} else {
|
||||
if (cinfo->progressive_mode) {
|
||||
#ifdef D_PROGRESSIVE_SUPPORTED
|
||||
jinit_phuff_decoder(cinfo);
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
#endif
|
||||
} else
|
||||
jinit_huff_decoder(cinfo);
|
||||
if (cinfo->arith_code)
|
||||
jinit_arith_decoder(cinfo);
|
||||
else {
|
||||
jinit_huff_decoder(cinfo);
|
||||
}
|
||||
|
||||
/* Initialize principal buffer controllers. */
|
||||
|
668
jpeg/jdphuff.c
668
jpeg/jdphuff.c
@ -1,668 +0,0 @@
|
||||
/*
|
||||
* jdphuff.c
|
||||
*
|
||||
* Copyright (C) 1995-1997, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains Huffman entropy decoding routines for progressive JPEG.
|
||||
*
|
||||
* Much of the complexity here has to do with supporting input suspension.
|
||||
* If the data source module demands suspension, we want to be able to back
|
||||
* up to the start of the current MCU. To do this, we copy state variables
|
||||
* into local working storage, and update them back to the permanent
|
||||
* storage only upon successful completion of an MCU.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
#include "jdhuff.h" /* Declarations shared with jdhuff.c */
|
||||
|
||||
|
||||
#ifdef D_PROGRESSIVE_SUPPORTED
|
||||
|
||||
/*
|
||||
* Expanded entropy decoder object for progressive Huffman decoding.
|
||||
*
|
||||
* The savable_state subrecord contains fields that change within an MCU,
|
||||
* but must not be updated permanently until we complete the MCU.
|
||||
*/
|
||||
|
||||
typedef struct {
|
||||
unsigned int EOBRUN; /* remaining EOBs in EOBRUN */
|
||||
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
|
||||
} savable_state;
|
||||
|
||||
/* This macro is to work around compilers with missing or broken
|
||||
* structure assignment. You'll need to fix this code if you have
|
||||
* such a compiler and you change MAX_COMPS_IN_SCAN.
|
||||
*/
|
||||
|
||||
#ifndef NO_STRUCT_ASSIGN
|
||||
#define ASSIGN_STATE(dest,src) ((dest) = (src))
|
||||
#else
|
||||
#if MAX_COMPS_IN_SCAN == 4
|
||||
#define ASSIGN_STATE(dest,src) \
|
||||
((dest).EOBRUN = (src).EOBRUN, \
|
||||
(dest).last_dc_val[0] = (src).last_dc_val[0], \
|
||||
(dest).last_dc_val[1] = (src).last_dc_val[1], \
|
||||
(dest).last_dc_val[2] = (src).last_dc_val[2], \
|
||||
(dest).last_dc_val[3] = (src).last_dc_val[3])
|
||||
#endif
|
||||
#endif
|
||||
|
||||
|
||||
typedef struct {
|
||||
struct jpeg_entropy_decoder pub; /* public fields */
|
||||
|
||||
/* These fields are loaded into local variables at start of each MCU.
|
||||
* In case of suspension, we exit WITHOUT updating them.
|
||||
*/
|
||||
bitread_perm_state bitstate; /* Bit buffer at start of MCU */
|
||||
savable_state saved; /* Other state at start of MCU */
|
||||
|
||||
/* These fields are NOT loaded into local working state. */
|
||||
unsigned int restarts_to_go; /* MCUs left in this restart interval */
|
||||
|
||||
/* Pointers to derived tables (these workspaces have image lifespan) */
|
||||
d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
|
||||
|
||||
d_derived_tbl * ac_derived_tbl; /* active table during an AC scan */
|
||||
} phuff_entropy_decoder;
|
||||
|
||||
typedef phuff_entropy_decoder * phuff_entropy_ptr;
|
||||
|
||||
/* Forward declarations */
|
||||
METHODDEF(boolean) decode_mcu_DC_first JPP((j_decompress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) decode_mcu_AC_first JPP((j_decompress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) decode_mcu_DC_refine JPP((j_decompress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
METHODDEF(boolean) decode_mcu_AC_refine JPP((j_decompress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
|
||||
|
||||
/*
|
||||
* Initialize for a Huffman-compressed scan.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_pass_phuff_decoder (j_decompress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
boolean is_DC_band, bad;
|
||||
int ci, coefi, tbl;
|
||||
int *coef_bit_ptr;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
is_DC_band = (cinfo->Ss == 0);
|
||||
|
||||
/* Validate scan parameters */
|
||||
bad = FALSE;
|
||||
if (is_DC_band) {
|
||||
if (cinfo->Se != 0)
|
||||
bad = TRUE;
|
||||
} else {
|
||||
/* need not check Ss/Se < 0 since they came from unsigned bytes */
|
||||
if (cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
|
||||
bad = TRUE;
|
||||
/* AC scans may have only one component */
|
||||
if (cinfo->comps_in_scan != 1)
|
||||
bad = TRUE;
|
||||
}
|
||||
if (cinfo->Ah != 0) {
|
||||
/* Successive approximation refinement scan: must have Al = Ah-1. */
|
||||
if (cinfo->Al != cinfo->Ah-1)
|
||||
bad = TRUE;
|
||||
}
|
||||
if (cinfo->Al > 13) /* need not check for < 0 */
|
||||
bad = TRUE;
|
||||
/* Arguably the maximum Al value should be less than 13 for 8-bit precision,
|
||||
* but the spec doesn't say so, and we try to be liberal about what we
|
||||
* accept. Note: large Al values could result in out-of-range DC
|
||||
* coefficients during early scans, leading to bizarre displays due to
|
||||
* overflows in the IDCT math. But we won't crash.
|
||||
*/
|
||||
if (bad)
|
||||
ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
|
||||
cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
|
||||
/* Update progression status, and verify that scan order is legal.
|
||||
* Note that inter-scan inconsistencies are treated as warnings
|
||||
* not fatal errors ... not clear if this is right way to behave.
|
||||
*/
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
int cindex = cinfo->cur_comp_info[ci]->component_index;
|
||||
coef_bit_ptr = & cinfo->coef_bits[cindex][0];
|
||||
if (!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
|
||||
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
|
||||
for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
|
||||
int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
|
||||
if (cinfo->Ah != expected)
|
||||
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
|
||||
coef_bit_ptr[coefi] = cinfo->Al;
|
||||
}
|
||||
}
|
||||
|
||||
/* Select MCU decoding routine */
|
||||
if (cinfo->Ah == 0) {
|
||||
if (is_DC_band)
|
||||
entropy->pub.decode_mcu = decode_mcu_DC_first;
|
||||
else
|
||||
entropy->pub.decode_mcu = decode_mcu_AC_first;
|
||||
} else {
|
||||
if (is_DC_band)
|
||||
entropy->pub.decode_mcu = decode_mcu_DC_refine;
|
||||
else
|
||||
entropy->pub.decode_mcu = decode_mcu_AC_refine;
|
||||
}
|
||||
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
/* Make sure requested tables are present, and compute derived tables.
|
||||
* We may build same derived table more than once, but it's not expensive.
|
||||
*/
|
||||
if (is_DC_band) {
|
||||
if (cinfo->Ah == 0) { /* DC refinement needs no table */
|
||||
tbl = compptr->dc_tbl_no;
|
||||
jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
|
||||
& entropy->derived_tbls[tbl]);
|
||||
}
|
||||
} else {
|
||||
tbl = compptr->ac_tbl_no;
|
||||
jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
|
||||
& entropy->derived_tbls[tbl]);
|
||||
/* remember the single active table */
|
||||
entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
|
||||
}
|
||||
/* Initialize DC predictions to 0 */
|
||||
entropy->saved.last_dc_val[ci] = 0;
|
||||
}
|
||||
|
||||
/* Initialize bitread state variables */
|
||||
entropy->bitstate.bits_left = 0;
|
||||
entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
|
||||
entropy->pub.insufficient_data = FALSE;
|
||||
|
||||
/* Initialize private state variables */
|
||||
entropy->saved.EOBRUN = 0;
|
||||
|
||||
/* Initialize restart counter */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Figure F.12: extend sign bit.
|
||||
* On some machines, a shift and add will be faster than a table lookup.
|
||||
*/
|
||||
|
||||
#ifdef AVOID_TABLES
|
||||
|
||||
#define HUFF_EXTEND(x,s) ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
|
||||
|
||||
#else
|
||||
|
||||
#define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
|
||||
|
||||
static const int extend_test[16] = /* entry n is 2**(n-1) */
|
||||
{ 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
|
||||
0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
|
||||
|
||||
static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
|
||||
{ 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
|
||||
((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
|
||||
((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
|
||||
((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
|
||||
|
||||
#endif /* AVOID_TABLES */
|
||||
|
||||
|
||||
/*
|
||||
* Check for a restart marker & resynchronize decoder.
|
||||
* Returns FALSE if must suspend.
|
||||
*/
|
||||
|
||||
LOCAL(boolean)
|
||||
process_restart (j_decompress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
int ci;
|
||||
|
||||
/* Throw away any unused bits remaining in bit buffer; */
|
||||
/* include any full bytes in next_marker's count of discarded bytes */
|
||||
cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
|
||||
entropy->bitstate.bits_left = 0;
|
||||
|
||||
/* Advance past the RSTn marker */
|
||||
if (! (*cinfo->marker->read_restart_marker) (cinfo))
|
||||
return FALSE;
|
||||
|
||||
/* Re-initialize DC predictions to 0 */
|
||||
for (ci = 0; ci < cinfo->comps_in_scan; ci++)
|
||||
entropy->saved.last_dc_val[ci] = 0;
|
||||
/* Re-init EOB run count, too */
|
||||
entropy->saved.EOBRUN = 0;
|
||||
|
||||
/* Reset restart counter */
|
||||
entropy->restarts_to_go = cinfo->restart_interval;
|
||||
|
||||
/* Reset out-of-data flag, unless read_restart_marker left us smack up
|
||||
* against a marker. In that case we will end up treating the next data
|
||||
* segment as empty, and we can avoid producing bogus output pixels by
|
||||
* leaving the flag set.
|
||||
*/
|
||||
if (cinfo->unread_marker == 0)
|
||||
entropy->pub.insufficient_data = FALSE;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Huffman MCU decoding.
|
||||
* Each of these routines decodes and returns one MCU's worth of
|
||||
* Huffman-compressed coefficients.
|
||||
* The coefficients are reordered from zigzag order into natural array order,
|
||||
* but are not dequantized.
|
||||
*
|
||||
* The i'th block of the MCU is stored into the block pointed to by
|
||||
* MCU_data[i]. WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
|
||||
*
|
||||
* We return FALSE if data source requested suspension. In that case no
|
||||
* changes have been made to permanent state. (Exception: some output
|
||||
* coefficients may already have been assigned. This is harmless for
|
||||
* spectral selection, since we'll just re-assign them on the next call.
|
||||
* Successive approximation AC refinement has to be more careful, however.)
|
||||
*/
|
||||
|
||||
/*
|
||||
* MCU decoding for DC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
int Al = cinfo->Al;
|
||||
register int s, r;
|
||||
int blkn, ci;
|
||||
JBLOCKROW block;
|
||||
BITREAD_STATE_VARS;
|
||||
savable_state state;
|
||||
d_derived_tbl * tbl;
|
||||
jpeg_component_info * compptr;
|
||||
|
||||
/* Process restart marker if needed; may have to suspend */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
if (! process_restart(cinfo))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* If we've run out of data, just leave the MCU set to zeroes.
|
||||
* This way, we return uniform gray for the remainder of the segment.
|
||||
*/
|
||||
if (! entropy->pub.insufficient_data) {
|
||||
|
||||
/* Load up working state */
|
||||
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
|
||||
ASSIGN_STATE(state, entropy->saved);
|
||||
|
||||
/* Outer loop handles each block in the MCU */
|
||||
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
ci = cinfo->MCU_membership[blkn];
|
||||
compptr = cinfo->cur_comp_info[ci];
|
||||
tbl = entropy->derived_tbls[compptr->dc_tbl_no];
|
||||
|
||||
/* Decode a single block's worth of coefficients */
|
||||
|
||||
/* Section F.2.2.1: decode the DC coefficient difference */
|
||||
HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
|
||||
if (s) {
|
||||
CHECK_BIT_BUFFER(br_state, s, return FALSE);
|
||||
r = GET_BITS(s);
|
||||
s = HUFF_EXTEND(r, s);
|
||||
}
|
||||
|
||||
/* Convert DC difference to actual value, update last_dc_val */
|
||||
s += state.last_dc_val[ci];
|
||||
state.last_dc_val[ci] = s;
|
||||
/* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */
|
||||
(*block)[0] = (JCOEF) (s << Al);
|
||||
}
|
||||
|
||||
/* Completed MCU, so update state */
|
||||
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
|
||||
ASSIGN_STATE(entropy->saved, state);
|
||||
}
|
||||
|
||||
/* Account for restart interval (no-op if not using restarts) */
|
||||
entropy->restarts_to_go--;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for AC initial scan (either spectral selection,
|
||||
* or first pass of successive approximation).
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
int Se = cinfo->Se;
|
||||
int Al = cinfo->Al;
|
||||
register int s, k, r;
|
||||
unsigned int EOBRUN;
|
||||
JBLOCKROW block;
|
||||
BITREAD_STATE_VARS;
|
||||
d_derived_tbl * tbl;
|
||||
|
||||
/* Process restart marker if needed; may have to suspend */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
if (! process_restart(cinfo))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* If we've run out of data, just leave the MCU set to zeroes.
|
||||
* This way, we return uniform gray for the remainder of the segment.
|
||||
*/
|
||||
if (! entropy->pub.insufficient_data) {
|
||||
|
||||
/* Load up working state.
|
||||
* We can avoid loading/saving bitread state if in an EOB run.
|
||||
*/
|
||||
EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
|
||||
|
||||
/* There is always only one block per MCU */
|
||||
|
||||
if (EOBRUN > 0) /* if it's a band of zeroes... */
|
||||
EOBRUN--; /* ...process it now (we do nothing) */
|
||||
else {
|
||||
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
|
||||
block = MCU_data[0];
|
||||
tbl = entropy->ac_derived_tbl;
|
||||
|
||||
for (k = cinfo->Ss; k <= Se; k++) {
|
||||
HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
|
||||
r = s >> 4;
|
||||
s &= 15;
|
||||
if (s) {
|
||||
k += r;
|
||||
CHECK_BIT_BUFFER(br_state, s, return FALSE);
|
||||
r = GET_BITS(s);
|
||||
s = HUFF_EXTEND(r, s);
|
||||
/* Scale and output coefficient in natural (dezigzagged) order */
|
||||
(*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
|
||||
} else {
|
||||
if (r == 15) { /* ZRL */
|
||||
k += 15; /* skip 15 zeroes in band */
|
||||
} else { /* EOBr, run length is 2^r + appended bits */
|
||||
EOBRUN = 1 << r;
|
||||
if (r) { /* EOBr, r > 0 */
|
||||
CHECK_BIT_BUFFER(br_state, r, return FALSE);
|
||||
r = GET_BITS(r);
|
||||
EOBRUN += r;
|
||||
}
|
||||
EOBRUN--; /* this band is processed at this moment */
|
||||
break; /* force end-of-band */
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
|
||||
}
|
||||
|
||||
/* Completed MCU, so update state */
|
||||
entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
|
||||
}
|
||||
|
||||
/* Account for restart interval (no-op if not using restarts) */
|
||||
entropy->restarts_to_go--;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for DC successive approximation refinement scan.
|
||||
* Note: we assume such scans can be multi-component, although the spec
|
||||
* is not very clear on the point.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
|
||||
int blkn;
|
||||
JBLOCKROW block;
|
||||
BITREAD_STATE_VARS;
|
||||
|
||||
/* Process restart marker if needed; may have to suspend */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
if (! process_restart(cinfo))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* Not worth the cycles to check insufficient_data here,
|
||||
* since we will not change the data anyway if we read zeroes.
|
||||
*/
|
||||
|
||||
/* Load up working state */
|
||||
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
|
||||
|
||||
/* Outer loop handles each block in the MCU */
|
||||
|
||||
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
|
||||
block = MCU_data[blkn];
|
||||
|
||||
/* Encoded data is simply the next bit of the two's-complement DC value */
|
||||
CHECK_BIT_BUFFER(br_state, 1, return FALSE);
|
||||
if (GET_BITS(1))
|
||||
(*block)[0] |= p1;
|
||||
/* Note: since we use |=, repeating the assignment later is safe */
|
||||
}
|
||||
|
||||
/* Completed MCU, so update state */
|
||||
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
|
||||
|
||||
/* Account for restart interval (no-op if not using restarts) */
|
||||
entropy->restarts_to_go--;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* MCU decoding for AC successive approximation refinement scan.
|
||||
*/
|
||||
|
||||
METHODDEF(boolean)
|
||||
decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
|
||||
{
|
||||
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
|
||||
int Se = cinfo->Se;
|
||||
int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
|
||||
int m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
|
||||
register int s, k, r;
|
||||
unsigned int EOBRUN;
|
||||
JBLOCKROW block;
|
||||
JCOEFPTR thiscoef;
|
||||
BITREAD_STATE_VARS;
|
||||
d_derived_tbl * tbl;
|
||||
int num_newnz;
|
||||
int newnz_pos[DCTSIZE2];
|
||||
|
||||
/* Process restart marker if needed; may have to suspend */
|
||||
if (cinfo->restart_interval) {
|
||||
if (entropy->restarts_to_go == 0)
|
||||
if (! process_restart(cinfo))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* If we've run out of data, don't modify the MCU.
|
||||
*/
|
||||
if (! entropy->pub.insufficient_data) {
|
||||
|
||||
/* Load up working state */
|
||||
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
|
||||
EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
|
||||
|
||||
/* There is always only one block per MCU */
|
||||
block = MCU_data[0];
|
||||
tbl = entropy->ac_derived_tbl;
|
||||
|
||||
/* If we are forced to suspend, we must undo the assignments to any newly
|
||||
* nonzero coefficients in the block, because otherwise we'd get confused
|
||||
* next time about which coefficients were already nonzero.
|
||||
* But we need not undo addition of bits to already-nonzero coefficients;
|
||||
* instead, we can test the current bit to see if we already did it.
|
||||
*/
|
||||
num_newnz = 0;
|
||||
|
||||
/* initialize coefficient loop counter to start of band */
|
||||
k = cinfo->Ss;
|
||||
|
||||
if (EOBRUN == 0) {
|
||||
for (; k <= Se; k++) {
|
||||
HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
|
||||
r = s >> 4;
|
||||
s &= 15;
|
||||
if (s) {
|
||||
if (s != 1) /* size of new coef should always be 1 */
|
||||
WARNMS(cinfo, JWRN_HUFF_BAD_CODE);
|
||||
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
|
||||
if (GET_BITS(1))
|
||||
s = p1; /* newly nonzero coef is positive */
|
||||
else
|
||||
s = m1; /* newly nonzero coef is negative */
|
||||
} else {
|
||||
if (r != 15) {
|
||||
EOBRUN = 1 << r; /* EOBr, run length is 2^r + appended bits */
|
||||
if (r) {
|
||||
CHECK_BIT_BUFFER(br_state, r, goto undoit);
|
||||
r = GET_BITS(r);
|
||||
EOBRUN += r;
|
||||
}
|
||||
break; /* rest of block is handled by EOB logic */
|
||||
}
|
||||
/* note s = 0 for processing ZRL */
|
||||
}
|
||||
/* Advance over already-nonzero coefs and r still-zero coefs,
|
||||
* appending correction bits to the nonzeroes. A correction bit is 1
|
||||
* if the absolute value of the coefficient must be increased.
|
||||
*/
|
||||
do {
|
||||
thiscoef = *block + jpeg_natural_order[k];
|
||||
if (*thiscoef != 0) {
|
||||
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
|
||||
if (GET_BITS(1)) {
|
||||
if ((*thiscoef & p1) == 0) { /* do nothing if already set it */
|
||||
if (*thiscoef >= 0)
|
||||
*thiscoef += p1;
|
||||
else
|
||||
*thiscoef += m1;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if (--r < 0)
|
||||
break; /* reached target zero coefficient */
|
||||
}
|
||||
k++;
|
||||
} while (k <= Se);
|
||||
if (s) {
|
||||
int pos = jpeg_natural_order[k];
|
||||
/* Output newly nonzero coefficient */
|
||||
(*block)[pos] = (JCOEF) s;
|
||||
/* Remember its position in case we have to suspend */
|
||||
newnz_pos[num_newnz++] = pos;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (EOBRUN > 0) {
|
||||
/* Scan any remaining coefficient positions after the end-of-band
|
||||
* (the last newly nonzero coefficient, if any). Append a correction
|
||||
* bit to each already-nonzero coefficient. A correction bit is 1
|
||||
* if the absolute value of the coefficient must be increased.
|
||||
*/
|
||||
for (; k <= Se; k++) {
|
||||
thiscoef = *block + jpeg_natural_order[k];
|
||||
if (*thiscoef != 0) {
|
||||
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
|
||||
if (GET_BITS(1)) {
|
||||
if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
|
||||
if (*thiscoef >= 0)
|
||||
*thiscoef += p1;
|
||||
else
|
||||
*thiscoef += m1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/* Count one block completed in EOB run */
|
||||
EOBRUN--;
|
||||
}
|
||||
|
||||
/* Completed MCU, so update state */
|
||||
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
|
||||
entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
|
||||
}
|
||||
|
||||
/* Account for restart interval (no-op if not using restarts) */
|
||||
entropy->restarts_to_go--;
|
||||
|
||||
return TRUE;
|
||||
|
||||
undoit:
|
||||
/* Re-zero any output coefficients that we made newly nonzero */
|
||||
while (num_newnz > 0)
|
||||
(*block)[newnz_pos[--num_newnz]] = 0;
|
||||
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Module initialization routine for progressive Huffman entropy decoding.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jinit_phuff_decoder (j_decompress_ptr cinfo)
|
||||
{
|
||||
phuff_entropy_ptr entropy;
|
||||
int *coef_bit_ptr;
|
||||
int ci, i;
|
||||
|
||||
entropy = (phuff_entropy_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(phuff_entropy_decoder));
|
||||
cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
|
||||
entropy->pub.start_pass = start_pass_phuff_decoder;
|
||||
|
||||
/* Mark derived tables unallocated */
|
||||
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
||||
entropy->derived_tbls[i] = NULL;
|
||||
}
|
||||
|
||||
/* Create progression status table */
|
||||
cinfo->coef_bits = (int (*)[DCTSIZE2])
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
cinfo->num_components*DCTSIZE2*SIZEOF(int));
|
||||
coef_bit_ptr = & cinfo->coef_bits[0][0];
|
||||
for (ci = 0; ci < cinfo->num_components; ci++)
|
||||
for (i = 0; i < DCTSIZE2; i++)
|
||||
*coef_bit_ptr++ = -1;
|
||||
}
|
||||
|
||||
#endif /* D_PROGRESSIVE_SUPPORTED */
|
147
jpeg/jdsample.c
147
jpeg/jdsample.c
@ -2,13 +2,14 @@
|
||||
* jdsample.c
|
||||
*
|
||||
* Copyright (C) 1991-1996, Thomas G. Lane.
|
||||
* Modified 2002-2008 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains upsampling routines.
|
||||
*
|
||||
* Upsampling input data is counted in "row groups". A row group
|
||||
* is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
|
||||
* is defined to be (v_samp_factor * DCT_v_scaled_size / min_DCT_v_scaled_size)
|
||||
* sample rows of each component. Upsampling will normally produce
|
||||
* max_v_samp_factor pixel rows from each row group (but this could vary
|
||||
* if the upsampler is applying a scale factor of its own).
|
||||
@ -237,11 +238,11 @@ h2v1_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
register JSAMPROW inptr, outptr;
|
||||
register JSAMPLE invalue;
|
||||
JSAMPROW outend;
|
||||
int inrow;
|
||||
int outrow;
|
||||
|
||||
for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
|
||||
inptr = input_data[inrow];
|
||||
outptr = output_data[inrow];
|
||||
for (outrow = 0; outrow < cinfo->max_v_samp_factor; outrow++) {
|
||||
inptr = input_data[outrow];
|
||||
outptr = output_data[outrow];
|
||||
outend = outptr + cinfo->output_width;
|
||||
while (outptr < outend) {
|
||||
invalue = *inptr++; /* don't need GETJSAMPLE() here */
|
||||
@ -285,112 +286,6 @@ h2v2_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
|
||||
*
|
||||
* The upsampling algorithm is linear interpolation between pixel centers,
|
||||
* also known as a "triangle filter". This is a good compromise between
|
||||
* speed and visual quality. The centers of the output pixels are 1/4 and 3/4
|
||||
* of the way between input pixel centers.
|
||||
*
|
||||
* A note about the "bias" calculations: when rounding fractional values to
|
||||
* integer, we do not want to always round 0.5 up to the next integer.
|
||||
* If we did that, we'd introduce a noticeable bias towards larger values.
|
||||
* Instead, this code is arranged so that 0.5 will be rounded up or down at
|
||||
* alternate pixel locations (a simple ordered dither pattern).
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
h2v1_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
|
||||
{
|
||||
JSAMPARRAY output_data = *output_data_ptr;
|
||||
register JSAMPROW inptr, outptr;
|
||||
register int invalue;
|
||||
register JDIMENSION colctr;
|
||||
int inrow;
|
||||
|
||||
for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
|
||||
inptr = input_data[inrow];
|
||||
outptr = output_data[inrow];
|
||||
/* Special case for first column */
|
||||
invalue = GETJSAMPLE(*inptr++);
|
||||
*outptr++ = (JSAMPLE) invalue;
|
||||
*outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(*inptr) + 2) >> 2);
|
||||
|
||||
for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
|
||||
/* General case: 3/4 * nearer pixel + 1/4 * further pixel */
|
||||
invalue = GETJSAMPLE(*inptr++) * 3;
|
||||
*outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(inptr[-2]) + 1) >> 2);
|
||||
*outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(*inptr) + 2) >> 2);
|
||||
}
|
||||
|
||||
/* Special case for last column */
|
||||
invalue = GETJSAMPLE(*inptr);
|
||||
*outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(inptr[-1]) + 1) >> 2);
|
||||
*outptr++ = (JSAMPLE) invalue;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
|
||||
* Again a triangle filter; see comments for h2v1 case, above.
|
||||
*
|
||||
* It is OK for us to reference the adjacent input rows because we demanded
|
||||
* context from the main buffer controller (see initialization code).
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
h2v2_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
|
||||
{
|
||||
JSAMPARRAY output_data = *output_data_ptr;
|
||||
register JSAMPROW inptr0, inptr1, outptr;
|
||||
#if BITS_IN_JSAMPLE == 8
|
||||
register int thiscolsum, lastcolsum, nextcolsum;
|
||||
#else
|
||||
register INT32 thiscolsum, lastcolsum, nextcolsum;
|
||||
#endif
|
||||
register JDIMENSION colctr;
|
||||
int inrow, outrow, v;
|
||||
|
||||
inrow = outrow = 0;
|
||||
while (outrow < cinfo->max_v_samp_factor) {
|
||||
for (v = 0; v < 2; v++) {
|
||||
/* inptr0 points to nearest input row, inptr1 points to next nearest */
|
||||
inptr0 = input_data[inrow];
|
||||
if (v == 0) /* next nearest is row above */
|
||||
inptr1 = input_data[inrow-1];
|
||||
else /* next nearest is row below */
|
||||
inptr1 = input_data[inrow+1];
|
||||
outptr = output_data[outrow++];
|
||||
|
||||
/* Special case for first column */
|
||||
thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
|
||||
nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 4 + 8) >> 4);
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
|
||||
lastcolsum = thiscolsum; thiscolsum = nextcolsum;
|
||||
|
||||
for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
|
||||
/* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */
|
||||
/* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */
|
||||
nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
|
||||
lastcolsum = thiscolsum; thiscolsum = nextcolsum;
|
||||
}
|
||||
|
||||
/* Special case for last column */
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
|
||||
*outptr++ = (JSAMPLE) ((thiscolsum * 4 + 7) >> 4);
|
||||
}
|
||||
inrow++;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Module initialization routine for upsampling.
|
||||
*/
|
||||
@ -401,7 +296,7 @@ jinit_upsampler (j_decompress_ptr cinfo)
|
||||
my_upsample_ptr upsample;
|
||||
int ci;
|
||||
jpeg_component_info * compptr;
|
||||
boolean need_buffer, do_fancy;
|
||||
boolean need_buffer;
|
||||
int h_in_group, v_in_group, h_out_group, v_out_group;
|
||||
|
||||
upsample = (my_upsample_ptr)
|
||||
@ -415,11 +310,6 @@ jinit_upsampler (j_decompress_ptr cinfo)
|
||||
if (cinfo->CCIR601_sampling) /* this isn't supported */
|
||||
ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
|
||||
|
||||
/* jdmainct.c doesn't support context rows when min_DCT_scaled_size = 1,
|
||||
* so don't ask for it.
|
||||
*/
|
||||
do_fancy = cinfo->do_fancy_upsampling && cinfo->min_DCT_scaled_size > 1;
|
||||
|
||||
/* Verify we can handle the sampling factors, select per-component methods,
|
||||
* and create storage as needed.
|
||||
*/
|
||||
@ -428,10 +318,10 @@ jinit_upsampler (j_decompress_ptr cinfo)
|
||||
/* Compute size of an "input group" after IDCT scaling. This many samples
|
||||
* are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
|
||||
*/
|
||||
h_in_group = (compptr->h_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size;
|
||||
v_in_group = (compptr->v_samp_factor * compptr->DCT_scaled_size) /
|
||||
cinfo->min_DCT_scaled_size;
|
||||
h_in_group = (compptr->h_samp_factor * compptr->DCT_h_scaled_size) /
|
||||
cinfo->min_DCT_h_scaled_size;
|
||||
v_in_group = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
|
||||
cinfo->min_DCT_v_scaled_size;
|
||||
h_out_group = cinfo->max_h_samp_factor;
|
||||
v_out_group = cinfo->max_v_samp_factor;
|
||||
upsample->rowgroup_height[ci] = v_in_group; /* save for use later */
|
||||
@ -446,19 +336,12 @@ jinit_upsampler (j_decompress_ptr cinfo)
|
||||
need_buffer = FALSE;
|
||||
} else if (h_in_group * 2 == h_out_group &&
|
||||
v_in_group == v_out_group) {
|
||||
/* Special cases for 2h1v upsampling */
|
||||
if (do_fancy && compptr->downsampled_width > 2)
|
||||
upsample->methods[ci] = h2v1_fancy_upsample;
|
||||
else
|
||||
upsample->methods[ci] = h2v1_upsample;
|
||||
/* Special case for 2h1v upsampling */
|
||||
upsample->methods[ci] = h2v1_upsample;
|
||||
} else if (h_in_group * 2 == h_out_group &&
|
||||
v_in_group * 2 == v_out_group) {
|
||||
/* Special cases for 2h2v upsampling */
|
||||
if (do_fancy && compptr->downsampled_width > 2) {
|
||||
upsample->methods[ci] = h2v2_fancy_upsample;
|
||||
upsample->pub.need_context_rows = TRUE;
|
||||
} else
|
||||
upsample->methods[ci] = h2v2_upsample;
|
||||
/* Special case for 2h2v upsampling */
|
||||
upsample->methods[ci] = h2v2_upsample;
|
||||
} else if ((h_out_group % h_in_group) == 0 &&
|
||||
(v_out_group % v_in_group) == 0) {
|
||||
/* Generic integral-factors upsampling method */
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jdtrans.c
|
||||
*
|
||||
* Copyright (C) 1995-1997, Thomas G. Lane.
|
||||
* Modified 2000-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -99,18 +100,14 @@ transdecode_master_selection (j_decompress_ptr cinfo)
|
||||
/* This is effectively a buffered-image operation. */
|
||||
cinfo->buffered_image = TRUE;
|
||||
|
||||
/* Compute output image dimensions and related values. */
|
||||
jpeg_core_output_dimensions(cinfo);
|
||||
|
||||
/* Entropy decoding: either Huffman or arithmetic coding. */
|
||||
if (cinfo->arith_code) {
|
||||
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
|
||||
} else {
|
||||
if (cinfo->progressive_mode) {
|
||||
#ifdef D_PROGRESSIVE_SUPPORTED
|
||||
jinit_phuff_decoder(cinfo);
|
||||
#else
|
||||
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
||||
#endif
|
||||
} else
|
||||
jinit_huff_decoder(cinfo);
|
||||
if (cinfo->arith_code)
|
||||
jinit_arith_decoder(cinfo);
|
||||
else {
|
||||
jinit_huff_decoder(cinfo);
|
||||
}
|
||||
|
||||
/* Always get a full-image coefficient buffer. */
|
||||
|
@ -23,7 +23,6 @@
|
||||
#include "jpeglib.h"
|
||||
#include "jversion.h"
|
||||
#include "jerror.h"
|
||||
#include <stdlib.h>
|
||||
|
||||
#ifdef USE_WINDOWS_MESSAGEBOX
|
||||
#include <windows.h>
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jerror.h
|
||||
*
|
||||
* Copyright (C) 1994-1997, Thomas G. Lane.
|
||||
* Modified 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -39,14 +40,15 @@ typedef enum {
|
||||
JMESSAGE(JMSG_NOMESSAGE, "Bogus message code %d") /* Must be first entry! */
|
||||
|
||||
/* For maintenance convenience, list is alphabetical by message code name */
|
||||
JMESSAGE(JERR_ARITH_NOTIMPL,
|
||||
"Sorry, there are legal restrictions on arithmetic coding")
|
||||
JMESSAGE(JERR_BAD_ALIGN_TYPE, "ALIGN_TYPE is wrong, please fix")
|
||||
JMESSAGE(JERR_BAD_ALLOC_CHUNK, "MAX_ALLOC_CHUNK is wrong, please fix")
|
||||
JMESSAGE(JERR_BAD_BUFFER_MODE, "Bogus buffer control mode")
|
||||
JMESSAGE(JERR_BAD_COMPONENT_ID, "Invalid component ID %d in SOS")
|
||||
JMESSAGE(JERR_BAD_CROP_SPEC, "Invalid crop request")
|
||||
JMESSAGE(JERR_BAD_DCT_COEF, "DCT coefficient out of range")
|
||||
JMESSAGE(JERR_BAD_DCTSIZE, "IDCT output block size %d not supported")
|
||||
JMESSAGE(JERR_BAD_DCTSIZE, "DCT scaled block size %dx%d not supported")
|
||||
JMESSAGE(JERR_BAD_DROP_SAMPLING,
|
||||
"Component index %d: mismatching sampling ratio %d:%d, %d:%d, %c")
|
||||
JMESSAGE(JERR_BAD_HUFF_TABLE, "Bogus Huffman table definition")
|
||||
JMESSAGE(JERR_BAD_IN_COLORSPACE, "Bogus input colorspace")
|
||||
JMESSAGE(JERR_BAD_J_COLORSPACE, "Bogus JPEG colorspace")
|
||||
@ -93,6 +95,7 @@ JMESSAGE(JERR_MISSING_DATA, "Scan script does not transmit all data")
|
||||
JMESSAGE(JERR_MODE_CHANGE, "Invalid color quantization mode change")
|
||||
JMESSAGE(JERR_NOTIMPL, "Not implemented yet")
|
||||
JMESSAGE(JERR_NOT_COMPILED, "Requested feature was omitted at compile time")
|
||||
JMESSAGE(JERR_NO_ARITH_TABLE, "Arithmetic table 0x%02x was not defined")
|
||||
JMESSAGE(JERR_NO_BACKING_STORE, "Backing store not supported")
|
||||
JMESSAGE(JERR_NO_HUFF_TABLE, "Huffman table 0x%02x was not defined")
|
||||
JMESSAGE(JERR_NO_IMAGE, "JPEG datastream contains no image")
|
||||
@ -170,6 +173,7 @@ JMESSAGE(JTRC_UNKNOWN_IDS,
|
||||
JMESSAGE(JTRC_XMS_CLOSE, "Freed XMS handle %u")
|
||||
JMESSAGE(JTRC_XMS_OPEN, "Obtained XMS handle %u")
|
||||
JMESSAGE(JWRN_ADOBE_XFORM, "Unknown Adobe color transform code %d")
|
||||
JMESSAGE(JWRN_ARITH_BAD_CODE, "Corrupt JPEG data: bad arithmetic code")
|
||||
JMESSAGE(JWRN_BOGUS_PROGRESSION,
|
||||
"Inconsistent progression sequence for component %d coefficient %d")
|
||||
JMESSAGE(JWRN_EXTRANEOUS_DATA,
|
||||
@ -227,6 +231,15 @@ JMESSAGE(JWRN_TOO_MUCH_DATA, "Application transferred too many scanlines")
|
||||
(cinfo)->err->msg_parm.i[2] = (p3), \
|
||||
(cinfo)->err->msg_parm.i[3] = (p4), \
|
||||
(*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
|
||||
#define ERREXIT6(cinfo,code,p1,p2,p3,p4,p5,p6) \
|
||||
((cinfo)->err->msg_code = (code), \
|
||||
(cinfo)->err->msg_parm.i[0] = (p1), \
|
||||
(cinfo)->err->msg_parm.i[1] = (p2), \
|
||||
(cinfo)->err->msg_parm.i[2] = (p3), \
|
||||
(cinfo)->err->msg_parm.i[3] = (p4), \
|
||||
(cinfo)->err->msg_parm.i[4] = (p5), \
|
||||
(cinfo)->err->msg_parm.i[5] = (p6), \
|
||||
(*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
|
||||
#define ERREXITS(cinfo,code,str) \
|
||||
((cinfo)->err->msg_code = (code), \
|
||||
strncpy((cinfo)->err->msg_parm.s, (str), JMSG_STR_PARM_MAX), \
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jfdctflt.c
|
||||
*
|
||||
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||||
* Modified 2003-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -56,41 +57,46 @@
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_fdct_float (FAST_FLOAT * data)
|
||||
jpeg_fdct_float (FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col)
|
||||
{
|
||||
FAST_FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
|
||||
FAST_FLOAT tmp10, tmp11, tmp12, tmp13;
|
||||
FAST_FLOAT z1, z2, z3, z4, z5, z11, z13;
|
||||
FAST_FLOAT *dataptr;
|
||||
JSAMPROW elemptr;
|
||||
int ctr;
|
||||
|
||||
/* Pass 1: process rows. */
|
||||
|
||||
dataptr = data;
|
||||
for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
|
||||
tmp0 = dataptr[0] + dataptr[7];
|
||||
tmp7 = dataptr[0] - dataptr[7];
|
||||
tmp1 = dataptr[1] + dataptr[6];
|
||||
tmp6 = dataptr[1] - dataptr[6];
|
||||
tmp2 = dataptr[2] + dataptr[5];
|
||||
tmp5 = dataptr[2] - dataptr[5];
|
||||
tmp3 = dataptr[3] + dataptr[4];
|
||||
tmp4 = dataptr[3] - dataptr[4];
|
||||
|
||||
for (ctr = 0; ctr < DCTSIZE; ctr++) {
|
||||
elemptr = sample_data[ctr] + start_col;
|
||||
|
||||
/* Load data into workspace */
|
||||
tmp0 = (FAST_FLOAT) (GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]));
|
||||
tmp7 = (FAST_FLOAT) (GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]));
|
||||
tmp1 = (FAST_FLOAT) (GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]));
|
||||
tmp6 = (FAST_FLOAT) (GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]));
|
||||
tmp2 = (FAST_FLOAT) (GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]));
|
||||
tmp5 = (FAST_FLOAT) (GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]));
|
||||
tmp3 = (FAST_FLOAT) (GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]));
|
||||
tmp4 = (FAST_FLOAT) (GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]));
|
||||
|
||||
/* Even part */
|
||||
|
||||
|
||||
tmp10 = tmp0 + tmp3; /* phase 2 */
|
||||
tmp13 = tmp0 - tmp3;
|
||||
tmp11 = tmp1 + tmp2;
|
||||
tmp12 = tmp1 - tmp2;
|
||||
|
||||
dataptr[0] = tmp10 + tmp11; /* phase 3 */
|
||||
|
||||
/* Apply unsigned->signed conversion */
|
||||
dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */
|
||||
dataptr[4] = tmp10 - tmp11;
|
||||
|
||||
|
||||
z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
|
||||
dataptr[2] = tmp13 + z1; /* phase 5 */
|
||||
dataptr[6] = tmp13 - z1;
|
||||
|
||||
|
||||
/* Odd part */
|
||||
|
||||
tmp10 = tmp4 + tmp5; /* phase 2 */
|
||||
@ -126,21 +132,21 @@ jpeg_fdct_float (FAST_FLOAT * data)
|
||||
tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
|
||||
tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
|
||||
tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
|
||||
|
||||
|
||||
/* Even part */
|
||||
|
||||
|
||||
tmp10 = tmp0 + tmp3; /* phase 2 */
|
||||
tmp13 = tmp0 - tmp3;
|
||||
tmp11 = tmp1 + tmp2;
|
||||
tmp12 = tmp1 - tmp2;
|
||||
|
||||
|
||||
dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
|
||||
dataptr[DCTSIZE*4] = tmp10 - tmp11;
|
||||
|
||||
|
||||
z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
|
||||
dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
|
||||
dataptr[DCTSIZE*6] = tmp13 - z1;
|
||||
|
||||
|
||||
/* Odd part */
|
||||
|
||||
tmp10 = tmp4 + tmp5; /* phase 2 */
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jfdctfst.c
|
||||
*
|
||||
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||||
* Modified 2003-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -111,42 +112,47 @@
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_fdct_ifast (DCTELEM * data)
|
||||
jpeg_fdct_ifast (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)
|
||||
{
|
||||
DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
|
||||
DCTELEM tmp10, tmp11, tmp12, tmp13;
|
||||
DCTELEM z1, z2, z3, z4, z5, z11, z13;
|
||||
DCTELEM *dataptr;
|
||||
JSAMPROW elemptr;
|
||||
int ctr;
|
||||
SHIFT_TEMPS
|
||||
|
||||
/* Pass 1: process rows. */
|
||||
|
||||
dataptr = data;
|
||||
for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
|
||||
tmp0 = dataptr[0] + dataptr[7];
|
||||
tmp7 = dataptr[0] - dataptr[7];
|
||||
tmp1 = dataptr[1] + dataptr[6];
|
||||
tmp6 = dataptr[1] - dataptr[6];
|
||||
tmp2 = dataptr[2] + dataptr[5];
|
||||
tmp5 = dataptr[2] - dataptr[5];
|
||||
tmp3 = dataptr[3] + dataptr[4];
|
||||
tmp4 = dataptr[3] - dataptr[4];
|
||||
|
||||
for (ctr = 0; ctr < DCTSIZE; ctr++) {
|
||||
elemptr = sample_data[ctr] + start_col;
|
||||
|
||||
/* Load data into workspace */
|
||||
tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]);
|
||||
tmp7 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]);
|
||||
tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]);
|
||||
tmp6 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]);
|
||||
tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]);
|
||||
tmp5 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]);
|
||||
tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]);
|
||||
tmp4 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]);
|
||||
|
||||
/* Even part */
|
||||
|
||||
|
||||
tmp10 = tmp0 + tmp3; /* phase 2 */
|
||||
tmp13 = tmp0 - tmp3;
|
||||
tmp11 = tmp1 + tmp2;
|
||||
tmp12 = tmp1 - tmp2;
|
||||
|
||||
dataptr[0] = tmp10 + tmp11; /* phase 3 */
|
||||
|
||||
/* Apply unsigned->signed conversion */
|
||||
dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */
|
||||
dataptr[4] = tmp10 - tmp11;
|
||||
|
||||
|
||||
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
|
||||
dataptr[2] = tmp13 + z1; /* phase 5 */
|
||||
dataptr[6] = tmp13 - z1;
|
||||
|
||||
|
||||
/* Odd part */
|
||||
|
||||
tmp10 = tmp4 + tmp5; /* phase 2 */
|
||||
@ -182,21 +188,21 @@ jpeg_fdct_ifast (DCTELEM * data)
|
||||
tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
|
||||
tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
|
||||
tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
|
||||
|
||||
|
||||
/* Even part */
|
||||
|
||||
|
||||
tmp10 = tmp0 + tmp3; /* phase 2 */
|
||||
tmp13 = tmp0 - tmp3;
|
||||
tmp11 = tmp1 + tmp2;
|
||||
tmp12 = tmp1 - tmp2;
|
||||
|
||||
|
||||
dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
|
||||
dataptr[DCTSIZE*4] = tmp10 - tmp11;
|
||||
|
||||
|
||||
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
|
||||
dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
|
||||
dataptr[DCTSIZE*6] = tmp13 - z1;
|
||||
|
||||
|
||||
/* Odd part */
|
||||
|
||||
tmp10 = tmp4 + tmp5; /* phase 2 */
|
||||
|
4271
jpeg/jfdctint.c
4271
jpeg/jfdctint.c
File diff suppressed because it is too large
Load Diff
@ -2,6 +2,7 @@
|
||||
* jidctflt.c
|
||||
*
|
||||
* Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
* Modified 2010 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -76,10 +77,9 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
FLOAT_MULT_TYPE * quantptr;
|
||||
FAST_FLOAT * wsptr;
|
||||
JSAMPROW outptr;
|
||||
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
|
||||
JSAMPLE *range_limit = cinfo->sample_range_limit;
|
||||
int ctr;
|
||||
FAST_FLOAT workspace[DCTSIZE2]; /* buffers data between passes */
|
||||
SHIFT_TEMPS
|
||||
|
||||
/* Pass 1: process columns from input, store into work array. */
|
||||
|
||||
@ -152,12 +152,12 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562); /* 2*c4 */
|
||||
|
||||
z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
|
||||
tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
|
||||
tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
|
||||
tmp10 = z5 - z12 * ((FAST_FLOAT) 1.082392200); /* 2*(c2-c6) */
|
||||
tmp12 = z5 - z10 * ((FAST_FLOAT) 2.613125930); /* 2*(c2+c6) */
|
||||
|
||||
tmp6 = tmp12 - tmp7; /* phase 2 */
|
||||
tmp5 = tmp11 - tmp6;
|
||||
tmp4 = tmp10 + tmp5;
|
||||
tmp4 = tmp10 - tmp5;
|
||||
|
||||
wsptr[DCTSIZE*0] = tmp0 + tmp7;
|
||||
wsptr[DCTSIZE*7] = tmp0 - tmp7;
|
||||
@ -165,8 +165,8 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
wsptr[DCTSIZE*6] = tmp1 - tmp6;
|
||||
wsptr[DCTSIZE*2] = tmp2 + tmp5;
|
||||
wsptr[DCTSIZE*5] = tmp2 - tmp5;
|
||||
wsptr[DCTSIZE*4] = tmp3 + tmp4;
|
||||
wsptr[DCTSIZE*3] = tmp3 - tmp4;
|
||||
wsptr[DCTSIZE*3] = tmp3 + tmp4;
|
||||
wsptr[DCTSIZE*4] = tmp3 - tmp4;
|
||||
|
||||
inptr++; /* advance pointers to next column */
|
||||
quantptr++;
|
||||
@ -174,7 +174,6 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
}
|
||||
|
||||
/* Pass 2: process rows from work array, store into output array. */
|
||||
/* Note that we must descale the results by a factor of 8 == 2**3. */
|
||||
|
||||
wsptr = workspace;
|
||||
for (ctr = 0; ctr < DCTSIZE; ctr++) {
|
||||
@ -187,8 +186,10 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
|
||||
/* Even part */
|
||||
|
||||
tmp10 = wsptr[0] + wsptr[4];
|
||||
tmp11 = wsptr[0] - wsptr[4];
|
||||
/* Apply signed->unsigned and prepare float->int conversion */
|
||||
z5 = wsptr[0] + ((FAST_FLOAT) CENTERJSAMPLE + (FAST_FLOAT) 0.5);
|
||||
tmp10 = z5 + wsptr[4];
|
||||
tmp11 = z5 - wsptr[4];
|
||||
|
||||
tmp13 = wsptr[2] + wsptr[6];
|
||||
tmp12 = (wsptr[2] - wsptr[6]) * ((FAST_FLOAT) 1.414213562) - tmp13;
|
||||
@ -209,31 +210,23 @@ jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562);
|
||||
|
||||
z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
|
||||
tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
|
||||
tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
|
||||
tmp10 = z5 - z12 * ((FAST_FLOAT) 1.082392200); /* 2*(c2-c6) */
|
||||
tmp12 = z5 - z10 * ((FAST_FLOAT) 2.613125930); /* 2*(c2+c6) */
|
||||
|
||||
tmp6 = tmp12 - tmp7;
|
||||
tmp5 = tmp11 - tmp6;
|
||||
tmp4 = tmp10 + tmp5;
|
||||
tmp4 = tmp10 - tmp5;
|
||||
|
||||
/* Final output stage: scale down by a factor of 8 and range-limit */
|
||||
/* Final output stage: float->int conversion and range-limit */
|
||||
|
||||
outptr[0] = range_limit[(int) DESCALE((INT32) (tmp0 + tmp7), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[7] = range_limit[(int) DESCALE((INT32) (tmp0 - tmp7), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[1] = range_limit[(int) DESCALE((INT32) (tmp1 + tmp6), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[6] = range_limit[(int) DESCALE((INT32) (tmp1 - tmp6), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[2] = range_limit[(int) DESCALE((INT32) (tmp2 + tmp5), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[5] = range_limit[(int) DESCALE((INT32) (tmp2 - tmp5), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[4] = range_limit[(int) DESCALE((INT32) (tmp3 + tmp4), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[3] = range_limit[(int) DESCALE((INT32) (tmp3 - tmp4), 3)
|
||||
& RANGE_MASK];
|
||||
outptr[0] = range_limit[((int) (tmp0 + tmp7)) & RANGE_MASK];
|
||||
outptr[7] = range_limit[((int) (tmp0 - tmp7)) & RANGE_MASK];
|
||||
outptr[1] = range_limit[((int) (tmp1 + tmp6)) & RANGE_MASK];
|
||||
outptr[6] = range_limit[((int) (tmp1 - tmp6)) & RANGE_MASK];
|
||||
outptr[2] = range_limit[((int) (tmp2 + tmp5)) & RANGE_MASK];
|
||||
outptr[5] = range_limit[((int) (tmp2 - tmp5)) & RANGE_MASK];
|
||||
outptr[3] = range_limit[((int) (tmp3 + tmp4)) & RANGE_MASK];
|
||||
outptr[4] = range_limit[((int) (tmp3 - tmp4)) & RANGE_MASK];
|
||||
|
||||
wsptr += DCTSIZE; /* advance pointer to next row */
|
||||
}
|
||||
|
4966
jpeg/jidctint.c
4966
jpeg/jidctint.c
File diff suppressed because it is too large
Load Diff
398
jpeg/jidctred.c
398
jpeg/jidctred.c
@ -1,398 +0,0 @@
|
||||
/*
|
||||
* jidctred.c
|
||||
*
|
||||
* Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains inverse-DCT routines that produce reduced-size output:
|
||||
* either 4x4, 2x2, or 1x1 pixels from an 8x8 DCT block.
|
||||
*
|
||||
* The implementation is based on the Loeffler, Ligtenberg and Moschytz (LL&M)
|
||||
* algorithm used in jidctint.c. We simply replace each 8-to-8 1-D IDCT step
|
||||
* with an 8-to-4 step that produces the four averages of two adjacent outputs
|
||||
* (or an 8-to-2 step producing two averages of four outputs, for 2x2 output).
|
||||
* These steps were derived by computing the corresponding values at the end
|
||||
* of the normal LL&M code, then simplifying as much as possible.
|
||||
*
|
||||
* 1x1 is trivial: just take the DC coefficient divided by 8.
|
||||
*
|
||||
* See jidctint.c for additional comments.
|
||||
*/
|
||||
|
||||
#define JPEG_INTERNALS
|
||||
#include "jinclude.h"
|
||||
#include "jpeglib.h"
|
||||
#include "jdct.h" /* Private declarations for DCT subsystem */
|
||||
|
||||
#ifdef IDCT_SCALING_SUPPORTED
|
||||
|
||||
|
||||
/*
|
||||
* This module is specialized to the case DCTSIZE = 8.
|
||||
*/
|
||||
|
||||
#if DCTSIZE != 8
|
||||
Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
|
||||
#endif
|
||||
|
||||
|
||||
/* Scaling is the same as in jidctint.c. */
|
||||
|
||||
#if BITS_IN_JSAMPLE == 8
|
||||
#define CONST_BITS 13
|
||||
#define PASS1_BITS 2
|
||||
#else
|
||||
#define CONST_BITS 13
|
||||
#define PASS1_BITS 1 /* lose a little precision to avoid overflow */
|
||||
#endif
|
||||
|
||||
/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
|
||||
* causing a lot of useless floating-point operations at run time.
|
||||
* To get around this we use the following pre-calculated constants.
|
||||
* If you change CONST_BITS you may want to add appropriate values.
|
||||
* (With a reasonable C compiler, you can just rely on the FIX() macro...)
|
||||
*/
|
||||
|
||||
#if CONST_BITS == 13
|
||||
#define FIX_0_211164243 ((INT32) 1730) /* FIX(0.211164243) */
|
||||
#define FIX_0_509795579 ((INT32) 4176) /* FIX(0.509795579) */
|
||||
#define FIX_0_601344887 ((INT32) 4926) /* FIX(0.601344887) */
|
||||
#define FIX_0_720959822 ((INT32) 5906) /* FIX(0.720959822) */
|
||||
#define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */
|
||||
#define FIX_0_850430095 ((INT32) 6967) /* FIX(0.850430095) */
|
||||
#define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */
|
||||
#define FIX_1_061594337 ((INT32) 8697) /* FIX(1.061594337) */
|
||||
#define FIX_1_272758580 ((INT32) 10426) /* FIX(1.272758580) */
|
||||
#define FIX_1_451774981 ((INT32) 11893) /* FIX(1.451774981) */
|
||||
#define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */
|
||||
#define FIX_2_172734803 ((INT32) 17799) /* FIX(2.172734803) */
|
||||
#define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */
|
||||
#define FIX_3_624509785 ((INT32) 29692) /* FIX(3.624509785) */
|
||||
#else
|
||||
#define FIX_0_211164243 FIX(0.211164243)
|
||||
#define FIX_0_509795579 FIX(0.509795579)
|
||||
#define FIX_0_601344887 FIX(0.601344887)
|
||||
#define FIX_0_720959822 FIX(0.720959822)
|
||||
#define FIX_0_765366865 FIX(0.765366865)
|
||||
#define FIX_0_850430095 FIX(0.850430095)
|
||||
#define FIX_0_899976223 FIX(0.899976223)
|
||||
#define FIX_1_061594337 FIX(1.061594337)
|
||||
#define FIX_1_272758580 FIX(1.272758580)
|
||||
#define FIX_1_451774981 FIX(1.451774981)
|
||||
#define FIX_1_847759065 FIX(1.847759065)
|
||||
#define FIX_2_172734803 FIX(2.172734803)
|
||||
#define FIX_2_562915447 FIX(2.562915447)
|
||||
#define FIX_3_624509785 FIX(3.624509785)
|
||||
#endif
|
||||
|
||||
|
||||
/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
|
||||
* For 8-bit samples with the recommended scaling, all the variable
|
||||
* and constant values involved are no more than 16 bits wide, so a
|
||||
* 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
|
||||
* For 12-bit samples, a full 32-bit multiplication will be needed.
|
||||
*/
|
||||
|
||||
#if BITS_IN_JSAMPLE == 8
|
||||
#define MULTIPLY(var,const) MULTIPLY16C16(var,const)
|
||||
#else
|
||||
#define MULTIPLY(var,const) ((var) * (const))
|
||||
#endif
|
||||
|
||||
|
||||
/* Dequantize a coefficient by multiplying it by the multiplier-table
|
||||
* entry; produce an int result. In this module, both inputs and result
|
||||
* are 16 bits or less, so either int or short multiply will work.
|
||||
*/
|
||||
|
||||
#define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval))
|
||||
|
||||
|
||||
/*
|
||||
* Perform dequantization and inverse DCT on one block of coefficients,
|
||||
* producing a reduced-size 4x4 output block.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block,
|
||||
JSAMPARRAY output_buf, JDIMENSION output_col)
|
||||
{
|
||||
INT32 tmp0, tmp2, tmp10, tmp12;
|
||||
INT32 z1, z2, z3, z4;
|
||||
JCOEFPTR inptr;
|
||||
ISLOW_MULT_TYPE * quantptr;
|
||||
int * wsptr;
|
||||
JSAMPROW outptr;
|
||||
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
|
||||
int ctr;
|
||||
int workspace[DCTSIZE*4]; /* buffers data between passes */
|
||||
SHIFT_TEMPS
|
||||
|
||||
/* Pass 1: process columns from input, store into work array. */
|
||||
|
||||
inptr = coef_block;
|
||||
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
|
||||
wsptr = workspace;
|
||||
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
|
||||
/* Don't bother to process column 4, because second pass won't use it */
|
||||
if (ctr == DCTSIZE-4)
|
||||
continue;
|
||||
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
|
||||
inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*5] == 0 &&
|
||||
inptr[DCTSIZE*6] == 0 && inptr[DCTSIZE*7] == 0) {
|
||||
/* AC terms all zero; we need not examine term 4 for 4x4 output */
|
||||
int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
|
||||
|
||||
wsptr[DCTSIZE*0] = dcval;
|
||||
wsptr[DCTSIZE*1] = dcval;
|
||||
wsptr[DCTSIZE*2] = dcval;
|
||||
wsptr[DCTSIZE*3] = dcval;
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Even part */
|
||||
|
||||
tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
|
||||
tmp0 <<= (CONST_BITS+1);
|
||||
|
||||
z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
|
||||
z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
|
||||
|
||||
tmp2 = MULTIPLY(z2, FIX_1_847759065) + MULTIPLY(z3, - FIX_0_765366865);
|
||||
|
||||
tmp10 = tmp0 + tmp2;
|
||||
tmp12 = tmp0 - tmp2;
|
||||
|
||||
/* Odd part */
|
||||
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
|
||||
z2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
|
||||
z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
|
||||
z4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
|
||||
|
||||
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
|
||||
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
|
||||
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
|
||||
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
|
||||
|
||||
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
|
||||
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
|
||||
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
|
||||
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
|
||||
|
||||
/* Final output stage */
|
||||
|
||||
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp2, CONST_BITS-PASS1_BITS+1);
|
||||
wsptr[DCTSIZE*3] = (int) DESCALE(tmp10 - tmp2, CONST_BITS-PASS1_BITS+1);
|
||||
wsptr[DCTSIZE*1] = (int) DESCALE(tmp12 + tmp0, CONST_BITS-PASS1_BITS+1);
|
||||
wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 - tmp0, CONST_BITS-PASS1_BITS+1);
|
||||
}
|
||||
|
||||
/* Pass 2: process 4 rows from work array, store into output array. */
|
||||
|
||||
wsptr = workspace;
|
||||
for (ctr = 0; ctr < 4; ctr++) {
|
||||
outptr = output_buf[ctr] + output_col;
|
||||
/* It's not clear whether a zero row test is worthwhile here ... */
|
||||
|
||||
#ifndef NO_ZERO_ROW_TEST
|
||||
if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 &&
|
||||
wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
|
||||
/* AC terms all zero */
|
||||
JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
|
||||
& RANGE_MASK];
|
||||
|
||||
outptr[0] = dcval;
|
||||
outptr[1] = dcval;
|
||||
outptr[2] = dcval;
|
||||
outptr[3] = dcval;
|
||||
|
||||
wsptr += DCTSIZE; /* advance pointer to next row */
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Even part */
|
||||
|
||||
tmp0 = ((INT32) wsptr[0]) << (CONST_BITS+1);
|
||||
|
||||
tmp2 = MULTIPLY((INT32) wsptr[2], FIX_1_847759065)
|
||||
+ MULTIPLY((INT32) wsptr[6], - FIX_0_765366865);
|
||||
|
||||
tmp10 = tmp0 + tmp2;
|
||||
tmp12 = tmp0 - tmp2;
|
||||
|
||||
/* Odd part */
|
||||
|
||||
z1 = (INT32) wsptr[7];
|
||||
z2 = (INT32) wsptr[5];
|
||||
z3 = (INT32) wsptr[3];
|
||||
z4 = (INT32) wsptr[1];
|
||||
|
||||
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
|
||||
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
|
||||
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
|
||||
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
|
||||
|
||||
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
|
||||
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
|
||||
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
|
||||
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
|
||||
|
||||
/* Final output stage */
|
||||
|
||||
outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp2,
|
||||
CONST_BITS+PASS1_BITS+3+1)
|
||||
& RANGE_MASK];
|
||||
outptr[3] = range_limit[(int) DESCALE(tmp10 - tmp2,
|
||||
CONST_BITS+PASS1_BITS+3+1)
|
||||
& RANGE_MASK];
|
||||
outptr[1] = range_limit[(int) DESCALE(tmp12 + tmp0,
|
||||
CONST_BITS+PASS1_BITS+3+1)
|
||||
& RANGE_MASK];
|
||||
outptr[2] = range_limit[(int) DESCALE(tmp12 - tmp0,
|
||||
CONST_BITS+PASS1_BITS+3+1)
|
||||
& RANGE_MASK];
|
||||
|
||||
wsptr += DCTSIZE; /* advance pointer to next row */
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Perform dequantization and inverse DCT on one block of coefficients,
|
||||
* producing a reduced-size 2x2 output block.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block,
|
||||
JSAMPARRAY output_buf, JDIMENSION output_col)
|
||||
{
|
||||
INT32 tmp0, tmp10, z1;
|
||||
JCOEFPTR inptr;
|
||||
ISLOW_MULT_TYPE * quantptr;
|
||||
int * wsptr;
|
||||
JSAMPROW outptr;
|
||||
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
|
||||
int ctr;
|
||||
int workspace[DCTSIZE*2]; /* buffers data between passes */
|
||||
SHIFT_TEMPS
|
||||
|
||||
/* Pass 1: process columns from input, store into work array. */
|
||||
|
||||
inptr = coef_block;
|
||||
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
|
||||
wsptr = workspace;
|
||||
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
|
||||
/* Don't bother to process columns 2,4,6 */
|
||||
if (ctr == DCTSIZE-2 || ctr == DCTSIZE-4 || ctr == DCTSIZE-6)
|
||||
continue;
|
||||
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*3] == 0 &&
|
||||
inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*7] == 0) {
|
||||
/* AC terms all zero; we need not examine terms 2,4,6 for 2x2 output */
|
||||
int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
|
||||
|
||||
wsptr[DCTSIZE*0] = dcval;
|
||||
wsptr[DCTSIZE*1] = dcval;
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Even part */
|
||||
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
|
||||
tmp10 = z1 << (CONST_BITS+2);
|
||||
|
||||
/* Odd part */
|
||||
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
|
||||
tmp0 = MULTIPLY(z1, - FIX_0_720959822); /* sqrt(2) * (c7-c5+c3-c1) */
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
|
||||
tmp0 += MULTIPLY(z1, FIX_0_850430095); /* sqrt(2) * (-c1+c3+c5+c7) */
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
|
||||
tmp0 += MULTIPLY(z1, - FIX_1_272758580); /* sqrt(2) * (-c1+c3-c5-c7) */
|
||||
z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
|
||||
tmp0 += MULTIPLY(z1, FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
|
||||
|
||||
/* Final output stage */
|
||||
|
||||
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp0, CONST_BITS-PASS1_BITS+2);
|
||||
wsptr[DCTSIZE*1] = (int) DESCALE(tmp10 - tmp0, CONST_BITS-PASS1_BITS+2);
|
||||
}
|
||||
|
||||
/* Pass 2: process 2 rows from work array, store into output array. */
|
||||
|
||||
wsptr = workspace;
|
||||
for (ctr = 0; ctr < 2; ctr++) {
|
||||
outptr = output_buf[ctr] + output_col;
|
||||
/* It's not clear whether a zero row test is worthwhile here ... */
|
||||
|
||||
#ifndef NO_ZERO_ROW_TEST
|
||||
if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0) {
|
||||
/* AC terms all zero */
|
||||
JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
|
||||
& RANGE_MASK];
|
||||
|
||||
outptr[0] = dcval;
|
||||
outptr[1] = dcval;
|
||||
|
||||
wsptr += DCTSIZE; /* advance pointer to next row */
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Even part */
|
||||
|
||||
tmp10 = ((INT32) wsptr[0]) << (CONST_BITS+2);
|
||||
|
||||
/* Odd part */
|
||||
|
||||
tmp0 = MULTIPLY((INT32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
|
||||
+ MULTIPLY((INT32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
|
||||
+ MULTIPLY((INT32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
|
||||
+ MULTIPLY((INT32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
|
||||
|
||||
/* Final output stage */
|
||||
|
||||
outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp0,
|
||||
CONST_BITS+PASS1_BITS+3+2)
|
||||
& RANGE_MASK];
|
||||
outptr[1] = range_limit[(int) DESCALE(tmp10 - tmp0,
|
||||
CONST_BITS+PASS1_BITS+3+2)
|
||||
& RANGE_MASK];
|
||||
|
||||
wsptr += DCTSIZE; /* advance pointer to next row */
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Perform dequantization and inverse DCT on one block of coefficients,
|
||||
* producing a reduced-size 1x1 output block.
|
||||
*/
|
||||
|
||||
GLOBAL(void)
|
||||
jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JCOEFPTR coef_block,
|
||||
JSAMPARRAY output_buf, JDIMENSION output_col)
|
||||
{
|
||||
int dcval;
|
||||
ISLOW_MULT_TYPE * quantptr;
|
||||
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
|
||||
SHIFT_TEMPS
|
||||
|
||||
/* We hardly need an inverse DCT routine for this: just take the
|
||||
* average pixel value, which is one-eighth of the DC coefficient.
|
||||
*/
|
||||
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
|
||||
dcval = DEQUANTIZE(coef_block[0], quantptr[0]);
|
||||
dcval = (int) DESCALE((INT32) dcval, 3);
|
||||
|
||||
output_buf[0][output_col] = range_limit[dcval & RANGE_MASK];
|
||||
}
|
||||
|
||||
#endif /* IDCT_SCALING_SUPPORTED */
|
@ -2,6 +2,7 @@
|
||||
* jmorecfg.h
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -54,9 +55,22 @@
|
||||
* You can use a signed char by having GETJSAMPLE mask it with 0xFF.
|
||||
*/
|
||||
|
||||
#ifdef HAVE_UNSIGNED_CHAR
|
||||
|
||||
typedef unsigned char JSAMPLE;
|
||||
#define GETJSAMPLE(value) ((int) (value))
|
||||
|
||||
#else /* not HAVE_UNSIGNED_CHAR */
|
||||
|
||||
typedef char JSAMPLE;
|
||||
#ifdef CHAR_IS_UNSIGNED
|
||||
#define GETJSAMPLE(value) ((int) (value))
|
||||
#else
|
||||
#define GETJSAMPLE(value) ((int) (value) & 0xFF)
|
||||
#endif /* CHAR_IS_UNSIGNED */
|
||||
|
||||
#endif /* HAVE_UNSIGNED_CHAR */
|
||||
|
||||
#define MAXJSAMPLE 255
|
||||
#define CENTERJSAMPLE 128
|
||||
|
||||
@ -92,9 +106,23 @@ typedef short JCOEF;
|
||||
* managers, this is also the data type passed to fread/fwrite.
|
||||
*/
|
||||
|
||||
#ifdef HAVE_UNSIGNED_CHAR
|
||||
|
||||
typedef unsigned char JOCTET;
|
||||
#define GETJOCTET(value) (value)
|
||||
|
||||
#else /* not HAVE_UNSIGNED_CHAR */
|
||||
|
||||
typedef char JOCTET;
|
||||
#ifdef CHAR_IS_UNSIGNED
|
||||
#define GETJOCTET(value) (value)
|
||||
#else
|
||||
#define GETJOCTET(value) ((value) & 0xFF)
|
||||
#endif /* CHAR_IS_UNSIGNED */
|
||||
|
||||
#endif /* HAVE_UNSIGNED_CHAR */
|
||||
|
||||
|
||||
/* These typedefs are used for various table entries and so forth.
|
||||
* They must be at least as wide as specified; but making them too big
|
||||
* won't cost a huge amount of memory, so we don't provide special
|
||||
@ -104,11 +132,23 @@ typedef unsigned char JOCTET;
|
||||
|
||||
/* UINT8 must hold at least the values 0..255. */
|
||||
|
||||
#ifdef HAVE_UNSIGNED_CHAR
|
||||
typedef unsigned char UINT8;
|
||||
#else /* not HAVE_UNSIGNED_CHAR */
|
||||
#ifdef CHAR_IS_UNSIGNED
|
||||
typedef char UINT8;
|
||||
#else /* not CHAR_IS_UNSIGNED */
|
||||
typedef short UINT8;
|
||||
#endif /* CHAR_IS_UNSIGNED */
|
||||
#endif /* HAVE_UNSIGNED_CHAR */
|
||||
|
||||
/* UINT16 must hold at least the values 0..65535. */
|
||||
|
||||
#ifdef HAVE_UNSIGNED_SHORT
|
||||
typedef unsigned short UINT16;
|
||||
#else /* not HAVE_UNSIGNED_SHORT */
|
||||
typedef unsigned int UINT16;
|
||||
#endif /* HAVE_UNSIGNED_SHORT */
|
||||
|
||||
/* INT16 must hold at least the values -32768..32767. */
|
||||
|
||||
@ -118,8 +158,14 @@ typedef short INT16;
|
||||
|
||||
/* INT32 must hold at least signed 32-bit values. */
|
||||
|
||||
#ifndef XMD_H
|
||||
typedef int INT32;
|
||||
#ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
|
||||
#ifndef _BASETSD_H_ /* Microsoft defines it in basetsd.h */
|
||||
#ifndef _BASETSD_H /* MinGW is slightly different */
|
||||
#ifndef QGLOBAL_H /* Qt defines it in qglobal.h */
|
||||
typedef long INT32;
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Datatype used for image dimensions. The JPEG standard only supports
|
||||
@ -157,7 +203,12 @@ typedef unsigned int JDIMENSION;
|
||||
* Again, you can customize this if you need special linkage keywords.
|
||||
*/
|
||||
|
||||
#ifdef HAVE_PROTOTYPES
|
||||
#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
|
||||
#else
|
||||
#define JMETHOD(type,methodname,arglist) type (*methodname) ()
|
||||
#endif
|
||||
|
||||
|
||||
/* Here is the pseudo-keyword for declaring pointers that must be "far"
|
||||
* on 80x86 machines. Most of the specialized coding for 80x86 is handled
|
||||
@ -165,8 +216,13 @@ typedef unsigned int JDIMENSION;
|
||||
* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
|
||||
*/
|
||||
|
||||
#undef FAR
|
||||
#ifndef FAR
|
||||
#ifdef NEED_FAR_POINTERS
|
||||
#define FAR far
|
||||
#else
|
||||
#define FAR
|
||||
#endif
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
@ -177,7 +233,7 @@ typedef unsigned int JDIMENSION;
|
||||
*/
|
||||
|
||||
#ifndef HAVE_BOOLEAN
|
||||
typedef char boolean;
|
||||
typedef int boolean;
|
||||
#endif
|
||||
#ifndef FALSE /* in case these macros already exist */
|
||||
#define FALSE 0 /* values of boolean */
|
||||
@ -209,8 +265,6 @@ typedef char boolean;
|
||||
* (You may HAVE to do that if your compiler doesn't like null source files.)
|
||||
*/
|
||||
|
||||
/* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
|
||||
|
||||
/* Capability options common to encoder and decoder: */
|
||||
|
||||
#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
|
||||
@ -219,9 +273,10 @@ typedef char boolean;
|
||||
|
||||
/* Encoder capability options: */
|
||||
|
||||
#undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
|
||||
#define C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
|
||||
#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
|
||||
#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
|
||||
#define DCT_SCALING_SUPPORTED /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
|
||||
#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
|
||||
/* Note: if you selected 12-bit data precision, it is dangerous to turn off
|
||||
* ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
|
||||
@ -235,12 +290,12 @@ typedef char boolean;
|
||||
|
||||
/* Decoder capability options: */
|
||||
|
||||
#undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
|
||||
#define D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
|
||||
#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
|
||||
#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
|
||||
#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
|
||||
#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
|
||||
#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
|
||||
#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
|
||||
#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
|
||||
#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
|
||||
#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jpegint.h
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 1997-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -99,14 +100,16 @@ struct jpeg_downsampler {
|
||||
};
|
||||
|
||||
/* Forward DCT (also controls coefficient quantization) */
|
||||
typedef JMETHOD(void, forward_DCT_ptr,
|
||||
(j_compress_ptr cinfo, jpeg_component_info * compptr,
|
||||
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
|
||||
JDIMENSION start_row, JDIMENSION start_col,
|
||||
JDIMENSION num_blocks));
|
||||
|
||||
struct jpeg_forward_dct {
|
||||
JMETHOD(void, start_pass, (j_compress_ptr cinfo));
|
||||
/* perhaps this should be an array??? */
|
||||
JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
|
||||
jpeg_component_info * compptr,
|
||||
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
|
||||
JDIMENSION start_row, JDIMENSION start_col,
|
||||
JDIMENSION num_blocks));
|
||||
/* It is useful to allow each component to have a separate FDCT method. */
|
||||
forward_DCT_ptr forward_DCT[MAX_COMPONENTS];
|
||||
};
|
||||
|
||||
/* Entropy encoding */
|
||||
@ -210,10 +213,6 @@ struct jpeg_entropy_decoder {
|
||||
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
|
||||
JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
|
||||
JBLOCKROW *MCU_data));
|
||||
|
||||
/* This is here to share code between baseline and progressive decoders; */
|
||||
/* other modules probably should not use it */
|
||||
boolean insufficient_data; /* set TRUE after emitting warning */
|
||||
};
|
||||
|
||||
/* Inverse DCT (also performs dequantization) */
|
||||
@ -303,7 +302,7 @@ struct jpeg_color_quantizer {
|
||||
#define jinit_downsampler jIDownsampler
|
||||
#define jinit_forward_dct jIFDCT
|
||||
#define jinit_huff_encoder jIHEncoder
|
||||
#define jinit_phuff_encoder jIPHEncoder
|
||||
#define jinit_arith_encoder jIAEncoder
|
||||
#define jinit_marker_writer jIMWriter
|
||||
#define jinit_master_decompress jIDMaster
|
||||
#define jinit_d_main_controller jIDMainC
|
||||
@ -312,7 +311,7 @@ struct jpeg_color_quantizer {
|
||||
#define jinit_input_controller jIInCtlr
|
||||
#define jinit_marker_reader jIMReader
|
||||
#define jinit_huff_decoder jIHDecoder
|
||||
#define jinit_phuff_decoder jIPHDecoder
|
||||
#define jinit_arith_decoder jIADecoder
|
||||
#define jinit_inverse_dct jIIDCT
|
||||
#define jinit_upsampler jIUpsampler
|
||||
#define jinit_color_deconverter jIDColor
|
||||
@ -327,6 +326,13 @@ struct jpeg_color_quantizer {
|
||||
#define jzero_far jZeroFar
|
||||
#define jpeg_zigzag_order jZIGTable
|
||||
#define jpeg_natural_order jZAGTable
|
||||
#define jpeg_natural_order7 jZAGTable7
|
||||
#define jpeg_natural_order6 jZAGTable6
|
||||
#define jpeg_natural_order5 jZAGTable5
|
||||
#define jpeg_natural_order4 jZAGTable4
|
||||
#define jpeg_natural_order3 jZAGTable3
|
||||
#define jpeg_natural_order2 jZAGTable2
|
||||
#define jpeg_aritab jAriTab
|
||||
#endif /* NEED_SHORT_EXTERNAL_NAMES */
|
||||
|
||||
|
||||
@ -344,7 +350,7 @@ EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_arith_encoder JPP((j_compress_ptr cinfo));
|
||||
EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
|
||||
/* Decompression module initialization routines */
|
||||
EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
|
||||
@ -357,7 +363,7 @@ EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
|
||||
EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_arith_decoder JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
|
||||
@ -381,6 +387,15 @@ EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
|
||||
extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
|
||||
#endif
|
||||
extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
|
||||
extern const int jpeg_natural_order7[]; /* zz to natural order for 7x7 block */
|
||||
extern const int jpeg_natural_order6[]; /* zz to natural order for 6x6 block */
|
||||
extern const int jpeg_natural_order5[]; /* zz to natural order for 5x5 block */
|
||||
extern const int jpeg_natural_order4[]; /* zz to natural order for 4x4 block */
|
||||
extern const int jpeg_natural_order3[]; /* zz to natural order for 3x3 block */
|
||||
extern const int jpeg_natural_order2[]; /* zz to natural order for 2x2 block */
|
||||
|
||||
/* Arithmetic coding probability estimation tables in jaricom.c */
|
||||
extern const INT32 jpeg_aritab[];
|
||||
|
||||
/* Suppress undefined-structure complaints if necessary. */
|
||||
|
||||
|
102
jpeg/jpeglib.h
102
jpeg/jpeglib.h
@ -2,6 +2,7 @@
|
||||
* jpeglib.h
|
||||
*
|
||||
* Copyright (C) 1991-1998, Thomas G. Lane.
|
||||
* Modified 2002-2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -26,11 +27,17 @@
|
||||
#include "jmorecfg.h" /* seldom changed options */
|
||||
|
||||
|
||||
#ifdef __cplusplus
|
||||
#ifndef DONT_USE_EXTERN_C
|
||||
extern "C" {
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Version ID for the JPEG library.
|
||||
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
|
||||
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 80".
|
||||
*/
|
||||
|
||||
#define JPEG_LIB_VERSION 62 /* Version 6b */
|
||||
#define JPEG_LIB_VERSION 80 /* Version 8.0 */
|
||||
|
||||
|
||||
/* Various constants determining the sizes of things.
|
||||
@ -138,18 +145,18 @@ typedef struct {
|
||||
*/
|
||||
JDIMENSION width_in_blocks;
|
||||
JDIMENSION height_in_blocks;
|
||||
/* Size of a DCT block in samples. Always DCTSIZE for compression.
|
||||
* For decompression this is the size of the output from one DCT block,
|
||||
* reflecting any scaling we choose to apply during the IDCT step.
|
||||
* Values of 1,2,4,8 are likely to be supported. Note that different
|
||||
* components may receive different IDCT scalings.
|
||||
/* Size of a DCT block in samples,
|
||||
* reflecting any scaling we choose to apply during the DCT step.
|
||||
* Values from 1 to 16 are supported.
|
||||
* Note that different components may receive different DCT scalings.
|
||||
*/
|
||||
int DCT_scaled_size;
|
||||
int DCT_h_scaled_size;
|
||||
int DCT_v_scaled_size;
|
||||
/* The downsampled dimensions are the component's actual, unpadded number
|
||||
* of samples at the main buffer (preprocessing/compression interface), thus
|
||||
* downsampled_width = ceil(image_width * Hi/Hmax)
|
||||
* and similarly for height. For decompression, IDCT scaling is included, so
|
||||
* downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
|
||||
* of samples at the main buffer (preprocessing/compression interface);
|
||||
* DCT scaling is included, so
|
||||
* downsampled_width = ceil(image_width * Hi/Hmax * DCT_h_scaled_size/DCTSIZE)
|
||||
* and similarly for height.
|
||||
*/
|
||||
JDIMENSION downsampled_width; /* actual width in samples */
|
||||
JDIMENSION downsampled_height; /* actual height in samples */
|
||||
@ -164,7 +171,7 @@ typedef struct {
|
||||
int MCU_width; /* number of blocks per MCU, horizontally */
|
||||
int MCU_height; /* number of blocks per MCU, vertically */
|
||||
int MCU_blocks; /* MCU_width * MCU_height */
|
||||
int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */
|
||||
int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
|
||||
int last_col_width; /* # of non-dummy blocks across in last MCU */
|
||||
int last_row_height; /* # of non-dummy blocks down in last MCU */
|
||||
|
||||
@ -291,6 +298,17 @@ struct jpeg_compress_struct {
|
||||
* helper routines to simplify changing parameters.
|
||||
*/
|
||||
|
||||
unsigned int scale_num, scale_denom; /* fraction by which to scale image */
|
||||
|
||||
JDIMENSION jpeg_width; /* scaled JPEG image width */
|
||||
JDIMENSION jpeg_height; /* scaled JPEG image height */
|
||||
/* Dimensions of actual JPEG image that will be written to file,
|
||||
* derived from input dimensions by scaling factors above.
|
||||
* These fields are computed by jpeg_start_compress().
|
||||
* You can also use jpeg_calc_jpeg_dimensions() to determine these values
|
||||
* in advance of calling jpeg_start_compress().
|
||||
*/
|
||||
|
||||
int data_precision; /* bits of precision in image data */
|
||||
|
||||
int num_components; /* # of color components in JPEG image */
|
||||
@ -298,14 +316,17 @@ struct jpeg_compress_struct {
|
||||
|
||||
jpeg_component_info * comp_info;
|
||||
/* comp_info[i] describes component that appears i'th in SOF */
|
||||
|
||||
|
||||
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
|
||||
/* ptrs to coefficient quantization tables, or NULL if not defined */
|
||||
|
||||
int q_scale_factor[NUM_QUANT_TBLS];
|
||||
/* ptrs to coefficient quantization tables, or NULL if not defined,
|
||||
* and corresponding scale factors (percentage, initialized 100).
|
||||
*/
|
||||
|
||||
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
|
||||
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
|
||||
/* ptrs to Huffman coding tables, or NULL if not defined */
|
||||
|
||||
|
||||
UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
|
||||
UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
|
||||
UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
|
||||
@ -321,6 +342,7 @@ struct jpeg_compress_struct {
|
||||
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
|
||||
boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
|
||||
boolean CCIR601_sampling; /* TRUE=first samples are cosited */
|
||||
boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
|
||||
int smoothing_factor; /* 1..100, or 0 for no input smoothing */
|
||||
J_DCT_METHOD dct_method; /* DCT algorithm selector */
|
||||
|
||||
@ -364,6 +386,9 @@ struct jpeg_compress_struct {
|
||||
int max_h_samp_factor; /* largest h_samp_factor */
|
||||
int max_v_samp_factor; /* largest v_samp_factor */
|
||||
|
||||
int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
|
||||
int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
|
||||
|
||||
JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
|
||||
/* The coefficient controller receives data in units of MCU rows as defined
|
||||
* for fully interleaved scans (whether the JPEG file is interleaved or not).
|
||||
@ -389,6 +414,10 @@ struct jpeg_compress_struct {
|
||||
|
||||
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
|
||||
|
||||
int block_size; /* the basic DCT block size: 1..16 */
|
||||
const int * natural_order; /* natural-order position array */
|
||||
int lim_Se; /* min( Se, DCTSIZE2-1 ) */
|
||||
|
||||
/*
|
||||
* Links to compression subobjects (methods and private variables of modules)
|
||||
*/
|
||||
@ -535,6 +564,7 @@ struct jpeg_decompress_struct {
|
||||
jpeg_component_info * comp_info;
|
||||
/* comp_info[i] describes component that appears i'th in SOF */
|
||||
|
||||
boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
|
||||
boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
|
||||
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
|
||||
|
||||
@ -575,7 +605,8 @@ struct jpeg_decompress_struct {
|
||||
int max_h_samp_factor; /* largest h_samp_factor */
|
||||
int max_v_samp_factor; /* largest v_samp_factor */
|
||||
|
||||
int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */
|
||||
int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
|
||||
int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
|
||||
|
||||
JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
|
||||
/* The coefficient controller's input and output progress is measured in
|
||||
@ -583,7 +614,7 @@ struct jpeg_decompress_struct {
|
||||
* in fully interleaved JPEG scans, but are used whether the scan is
|
||||
* interleaved or not. We define an iMCU row as v_samp_factor DCT block
|
||||
* rows of each component. Therefore, the IDCT output contains
|
||||
* v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
|
||||
* v_samp_factor*DCT_v_scaled_size sample rows of a component per iMCU row.
|
||||
*/
|
||||
|
||||
JSAMPLE * sample_range_limit; /* table for fast range-limiting */
|
||||
@ -607,6 +638,12 @@ struct jpeg_decompress_struct {
|
||||
|
||||
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
|
||||
|
||||
/* These fields are derived from Se of first SOS marker.
|
||||
*/
|
||||
int block_size; /* the basic DCT block size: 1..16 */
|
||||
const int * natural_order; /* natural-order position array for entropy decode */
|
||||
int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
|
||||
|
||||
/* This field is shared between entropy decoder and marker parser.
|
||||
* It is either zero or the code of a JPEG marker that has been
|
||||
* read from the data source, but has not yet been processed.
|
||||
@ -836,11 +873,14 @@ typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
|
||||
#define jpeg_destroy_decompress jDestDecompress
|
||||
#define jpeg_stdio_dest jStdDest
|
||||
#define jpeg_stdio_src jStdSrc
|
||||
#define jpeg_mem_dest jMemDest
|
||||
#define jpeg_mem_src jMemSrc
|
||||
#define jpeg_set_defaults jSetDefaults
|
||||
#define jpeg_set_colorspace jSetColorspace
|
||||
#define jpeg_default_colorspace jDefColorspace
|
||||
#define jpeg_set_quality jSetQuality
|
||||
#define jpeg_set_linear_quality jSetLQuality
|
||||
#define jpeg_default_qtables jDefQTables
|
||||
#define jpeg_add_quant_table jAddQuantTable
|
||||
#define jpeg_quality_scaling jQualityScaling
|
||||
#define jpeg_simple_progression jSimProgress
|
||||
@ -850,6 +890,7 @@ typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
|
||||
#define jpeg_start_compress jStrtCompress
|
||||
#define jpeg_write_scanlines jWrtScanlines
|
||||
#define jpeg_finish_compress jFinCompress
|
||||
#define jpeg_calc_jpeg_dimensions jCjpegDimensions
|
||||
#define jpeg_write_raw_data jWrtRawData
|
||||
#define jpeg_write_marker jWrtMarker
|
||||
#define jpeg_write_m_header jWrtMHeader
|
||||
@ -866,6 +907,7 @@ typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
|
||||
#define jpeg_input_complete jInComplete
|
||||
#define jpeg_new_colormap jNewCMap
|
||||
#define jpeg_consume_input jConsumeInput
|
||||
#define jpeg_core_output_dimensions jCoreDimensions
|
||||
#define jpeg_calc_output_dimensions jCalcDimensions
|
||||
#define jpeg_save_markers jSaveMarkers
|
||||
#define jpeg_set_marker_processor jSetMarker
|
||||
@ -910,6 +952,14 @@ EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
|
||||
EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
|
||||
|
||||
/* Data source and destination managers: memory buffers. */
|
||||
EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
|
||||
unsigned char ** outbuffer,
|
||||
unsigned long * outsize));
|
||||
EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
|
||||
unsigned char * inbuffer,
|
||||
unsigned long insize));
|
||||
|
||||
/* Default parameter setup for compression */
|
||||
EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
|
||||
/* Compression parameter setup aids */
|
||||
@ -921,6 +971,8 @@ EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
|
||||
EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
|
||||
int scale_factor,
|
||||
boolean force_baseline));
|
||||
EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
|
||||
boolean force_baseline));
|
||||
EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
|
||||
const unsigned int *basic_table,
|
||||
int scale_factor,
|
||||
@ -940,12 +992,15 @@ EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
|
||||
JDIMENSION num_lines));
|
||||
EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
|
||||
|
||||
/* Precalculate JPEG dimensions for current compression parameters. */
|
||||
EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
|
||||
|
||||
/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
|
||||
EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
|
||||
JSAMPIMAGE data,
|
||||
JDIMENSION num_lines));
|
||||
|
||||
/* Write a special marker. See libjpeg.doc concerning safe usage. */
|
||||
/* Write a special marker. See libjpeg.txt concerning safe usage. */
|
||||
EXTERN(void) jpeg_write_marker
|
||||
JPP((j_compress_ptr cinfo, int marker,
|
||||
const JOCTET * dataptr, unsigned int datalen));
|
||||
@ -999,6 +1054,7 @@ EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
|
||||
#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
|
||||
|
||||
/* Precalculate output dimensions for current decompression parameters. */
|
||||
EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
|
||||
EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
|
||||
|
||||
/* Control saving of COM and APPn markers into marker_list. */
|
||||
@ -1093,4 +1149,10 @@ struct jpeg_color_quantizer { long dummy; };
|
||||
#include "jerror.h" /* fetch error codes too */
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
#ifndef DONT_USE_EXTERN_C
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#endif /* JPEGLIB_H */
|
||||
|
@ -2,6 +2,7 @@
|
||||
* jutils.c
|
||||
*
|
||||
* Copyright (C) 1991-1996, Thomas G. Lane.
|
||||
* Modified 2009 by Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -63,6 +64,57 @@ const int jpeg_natural_order[DCTSIZE2+16] = {
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order7[7*7+16] = {
|
||||
0, 1, 8, 16, 9, 2, 3, 10,
|
||||
17, 24, 32, 25, 18, 11, 4, 5,
|
||||
12, 19, 26, 33, 40, 48, 41, 34,
|
||||
27, 20, 13, 6, 14, 21, 28, 35,
|
||||
42, 49, 50, 43, 36, 29, 22, 30,
|
||||
37, 44, 51, 52, 45, 38, 46, 53,
|
||||
54,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order6[6*6+16] = {
|
||||
0, 1, 8, 16, 9, 2, 3, 10,
|
||||
17, 24, 32, 25, 18, 11, 4, 5,
|
||||
12, 19, 26, 33, 40, 41, 34, 27,
|
||||
20, 13, 21, 28, 35, 42, 43, 36,
|
||||
29, 37, 44, 45,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order5[5*5+16] = {
|
||||
0, 1, 8, 16, 9, 2, 3, 10,
|
||||
17, 24, 32, 25, 18, 11, 4, 12,
|
||||
19, 26, 33, 34, 27, 20, 28, 35,
|
||||
36,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order4[4*4+16] = {
|
||||
0, 1, 8, 16, 9, 2, 3, 10,
|
||||
17, 24, 25, 18, 11, 19, 26, 27,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order3[3*3+16] = {
|
||||
0, 1, 8, 16, 9, 2, 10, 17,
|
||||
18,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
const int jpeg_natural_order2[2*2+16] = {
|
||||
0, 1, 8, 9,
|
||||
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
|
||||
63, 63, 63, 63, 63, 63, 63, 63
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* Arithmetic utilities
|
||||
|
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* jversion.h
|
||||
*
|
||||
* Copyright (C) 1991-1998, Thomas G. Lane.
|
||||
* Copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
@ -9,6 +9,6 @@
|
||||
*/
|
||||
|
||||
|
||||
#define JVERSION "6b 27-Mar-1998"
|
||||
#define JVERSION "8b 16-May-2010"
|
||||
|
||||
#define JCOPYRIGHT "Copyright (C) 1998, Thomas G. Lane"
|
||||
#define JCOPYRIGHT "Copyright (C) 2010, Thomas G. Lane, Guido Vollbeding"
|
||||
|
@ -1,6 +1,6 @@
|
||||
USING THE IJG JPEG LIBRARY
|
||||
|
||||
Copyright (C) 1994-1998, Thomas G. Lane.
|
||||
Copyright (C) 1994-2009, Thomas G. Lane, Guido Vollbeding.
|
||||
This file is part of the Independent JPEG Group's software.
|
||||
For conditions of distribution and use, see the accompanying README file.
|
||||
|
||||
@ -93,7 +93,6 @@ JPEG processes are supported. (Our subset includes all features now in common
|
||||
use.) Unsupported ISO options include:
|
||||
* Hierarchical storage
|
||||
* Lossless JPEG
|
||||
* Arithmetic entropy coding (unsupported for legal reasons)
|
||||
* DNL marker
|
||||
* Nonintegral subsampling ratios
|
||||
We support both 8- and 12-bit data precision, but this is a compile-time
|
||||
@ -750,7 +749,7 @@ is to prepare a library file ("libjpeg.a", or a corresponding name on non-Unix
|
||||
machines) and reference it at your link step. If you use only half of the
|
||||
library (only compression or only decompression), only that much code will be
|
||||
included from the library, unless your linker is hopelessly brain-damaged.
|
||||
The supplied makefiles build libjpeg.a automatically (see install.doc).
|
||||
The supplied makefiles build libjpeg.a automatically (see install.txt).
|
||||
|
||||
While you can build the JPEG library as a shared library if the whim strikes
|
||||
you, we don't really recommend it. The trouble with shared libraries is that
|
||||
@ -850,6 +849,10 @@ int jpeg_quality_scaling (int quality)
|
||||
can't be expressed as a simple scalar multiplier, in which case the
|
||||
premise of this routine collapses. Caveat user.
|
||||
|
||||
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
|
||||
Set default quantization tables with linear q_scale_factor[] values
|
||||
(see below).
|
||||
|
||||
jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
|
||||
const unsigned int *basic_table,
|
||||
int scale_factor, boolean force_baseline)
|
||||
@ -889,6 +892,12 @@ J_DCT_METHOD dct_method
|
||||
recommended if high quality is a concern. JDCT_DEFAULT and
|
||||
JDCT_FASTEST are macros configurable by each installation.
|
||||
|
||||
unsigned int scale_num, scale_denom
|
||||
Scale the image by the fraction scale_num/scale_denom. Default is
|
||||
1/1, or no scaling. Currently, the supported scaling ratios are
|
||||
8/N with all N from 1 to 16. (The library design allows for arbitrary
|
||||
scaling ratios but this is not likely to be implemented any time soon.)
|
||||
|
||||
J_COLOR_SPACE jpeg_color_space
|
||||
int num_components
|
||||
The JPEG color space and corresponding number of components; see
|
||||
@ -930,6 +939,15 @@ int num_scans
|
||||
a suitable scan definition array for progressive JPEG.) This is
|
||||
discussed further under "Progressive JPEG support".
|
||||
|
||||
boolean do_fancy_downsampling
|
||||
If TRUE, use direct DCT scaling with DCT size > 8 for downsampling
|
||||
of chroma components.
|
||||
If FALSE, use only DCT size <= 8 and simple separate downsampling.
|
||||
Default is TRUE.
|
||||
For better image stability in multiple generation compression cycles
|
||||
it is preferable that this value matches the corresponding
|
||||
do_fancy_upsampling value in decompression.
|
||||
|
||||
int smoothing_factor
|
||||
If non-zero, the input image is smoothed; the value should be 1 for
|
||||
minimal smoothing to 100 for maximum smoothing. Consult jcsample.c
|
||||
@ -972,6 +990,30 @@ JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]
|
||||
routines will set up table slot 0 for luminance quality and table
|
||||
slot 1 for chrominance.
|
||||
|
||||
int q_scale_factor[NUM_QUANT_TBLS]
|
||||
Linear quantization scaling factors (percentage, initialized 100)
|
||||
for use with jpeg_default_qtables().
|
||||
See rdswitch.c and cjpeg.c for an example of usage.
|
||||
Note that the q_scale_factor[] fields are the "linear" scales, so you
|
||||
have to convert from user-defined ratings via jpeg_quality_scaling().
|
||||
Here is an example code which corresponds to cjpeg -quality 90,70:
|
||||
|
||||
jpeg_set_defaults(cinfo);
|
||||
|
||||
/* Set luminance quality 90. */
|
||||
cinfo->q_scale_factor[0] = jpeg_quality_scaling(90);
|
||||
/* Set chrominance quality 70. */
|
||||
cinfo->q_scale_factor[1] = jpeg_quality_scaling(70);
|
||||
|
||||
jpeg_default_qtables(cinfo, force_baseline);
|
||||
|
||||
CAUTION: You must also set 1x1 subsampling for efficient separate
|
||||
color quality selection, since the default value used by library
|
||||
is 2x2:
|
||||
|
||||
cinfo->comp_info[0].v_samp_factor = 1;
|
||||
cinfo->comp_info[0].h_samp_factor = 1;
|
||||
|
||||
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]
|
||||
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]
|
||||
Pointers to Huffman coding tables, one per table slot, or NULL if
|
||||
@ -982,9 +1024,16 @@ JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]
|
||||
by setting optimize_coding, as discussed above; there's seldom
|
||||
any need to mess with providing your own Huffman tables.
|
||||
|
||||
There are some additional cinfo fields which are not documented here
|
||||
because you currently can't change them; for example, you can't set
|
||||
arith_code TRUE because arithmetic coding is unsupported.
|
||||
|
||||
The actual dimensions of the JPEG image that will be written to the file are
|
||||
given by the following fields. These are computed from the input image
|
||||
dimensions and the compression parameters by jpeg_start_compress(). You can
|
||||
also call jpeg_calc_jpeg_dimensions() to obtain the values that will result
|
||||
from the current parameter settings. This can be useful if you are trying
|
||||
to pick a scaling ratio that will get close to a desired target size.
|
||||
|
||||
JDIMENSION jpeg_width Actual dimensions of output image.
|
||||
JDIMENSION jpeg_height
|
||||
|
||||
|
||||
Per-component parameters are stored in the struct cinfo.comp_info[i] for
|
||||
@ -1073,10 +1122,16 @@ J_COLOR_SPACE out_color_space
|
||||
unusual conversion.
|
||||
|
||||
unsigned int scale_num, scale_denom
|
||||
Scale the image by the fraction scale_num/scale_denom. Default is
|
||||
1/1, or no scaling. Currently, the only supported scaling ratios
|
||||
are 1/1, 1/2, 1/4, and 1/8. (The library design allows for arbitrary
|
||||
scaling ratios but this is not likely to be implemented any time soon.)
|
||||
Scale the image by the fraction scale_num/scale_denom. Currently,
|
||||
the supported scaling ratios are M/N with all M from 1 to 16, where
|
||||
N is the source DCT size, which is 8 for baseline JPEG. (The library
|
||||
design allows for arbitrary scaling ratios but this is not likely
|
||||
to be implemented any time soon.) The values are initialized by
|
||||
jpeg_read_header() with the source DCT size. For baseline JPEG
|
||||
this is 8/8. If you change only the scale_num value while leaving
|
||||
the other unchanged, then this specifies the DCT scaled size to be
|
||||
applied on the given input. For baseline JPEG this is equivalent
|
||||
to M/8 scaling, since the source DCT size for baseline JPEG is 8.
|
||||
Smaller scaling ratios permit significantly faster decoding since
|
||||
fewer pixels need be processed and a simpler IDCT method can be used.
|
||||
|
||||
@ -1132,9 +1187,13 @@ J_DCT_METHOD dct_method
|
||||
as described above for compression.
|
||||
|
||||
boolean do_fancy_upsampling
|
||||
If TRUE, do careful upsampling of chroma components. If FALSE,
|
||||
a faster but sloppier method is used. Default is TRUE. The visual
|
||||
impact of the sloppier method is often very small.
|
||||
If TRUE, use direct DCT scaling with DCT size > 8 for upsampling
|
||||
of chroma components.
|
||||
If FALSE, use only DCT size <= 8 and simple separate upsampling.
|
||||
Default is TRUE.
|
||||
For better image stability in multiple generation compression cycles
|
||||
it is preferable that this value matches the corresponding
|
||||
do_fancy_downsampling value in compression.
|
||||
|
||||
boolean do_block_smoothing
|
||||
If TRUE, interblock smoothing is applied in early stages of decoding
|
||||
@ -1374,21 +1433,22 @@ Compressed data handling (source and destination managers)
|
||||
|
||||
The JPEG compression library sends its compressed data to a "destination
|
||||
manager" module. The default destination manager just writes the data to a
|
||||
stdio stream, but you can provide your own manager to do something else.
|
||||
Similarly, the decompression library calls a "source manager" to obtain the
|
||||
compressed data; you can provide your own source manager if you want the data
|
||||
to come from somewhere other than a stdio stream.
|
||||
memory buffer or to a stdio stream, but you can provide your own manager to
|
||||
do something else. Similarly, the decompression library calls a "source
|
||||
manager" to obtain the compressed data; you can provide your own source
|
||||
manager if you want the data to come from somewhere other than a memory
|
||||
buffer or a stdio stream.
|
||||
|
||||
In both cases, compressed data is processed a bufferload at a time: the
|
||||
destination or source manager provides a work buffer, and the library invokes
|
||||
the manager only when the buffer is filled or emptied. (You could define a
|
||||
one-character buffer to force the manager to be invoked for each byte, but
|
||||
that would be rather inefficient.) The buffer's size and location are
|
||||
controlled by the manager, not by the library. For example, if you desired to
|
||||
decompress a JPEG datastream that was all in memory, you could just make the
|
||||
buffer pointer and length point to the original data in memory. Then the
|
||||
buffer-reload procedure would be invoked only if the decompressor ran off the
|
||||
end of the datastream, which would indicate an erroneous datastream.
|
||||
controlled by the manager, not by the library. For example, the memory
|
||||
source manager just makes the buffer pointer and length point to the original
|
||||
data in memory. In this case the buffer-reload procedure will be invoked
|
||||
only if the decompressor ran off the end of the datastream, which would
|
||||
indicate an erroneous datastream.
|
||||
|
||||
The work buffer is defined as an array of datatype JOCTET, which is generally
|
||||
"char" or "unsigned char". On a machine where char is not exactly 8 bits
|
||||
@ -1440,7 +1500,8 @@ You will also need code to create a jpeg_destination_mgr struct, fill in its
|
||||
method pointers, and insert a pointer to the struct into the "dest" field of
|
||||
the JPEG compression object. This can be done in-line in your setup code if
|
||||
you like, but it's probably cleaner to provide a separate routine similar to
|
||||
the jpeg_stdio_dest() routine of the supplied destination manager.
|
||||
the jpeg_stdio_dest() or jpeg_mem_dest() routines of the supplied destination
|
||||
managers.
|
||||
|
||||
Decompression source managers follow a parallel design, but with some
|
||||
additional frammishes. The source manager struct contains a pointer and count
|
||||
@ -1516,10 +1577,10 @@ You will also need code to create a jpeg_source_mgr struct, fill in its method
|
||||
pointers, and insert a pointer to the struct into the "src" field of the JPEG
|
||||
decompression object. This can be done in-line in your setup code if you
|
||||
like, but it's probably cleaner to provide a separate routine similar to the
|
||||
jpeg_stdio_src() routine of the supplied source manager.
|
||||
jpeg_stdio_src() or jpeg_mem_src() routines of the supplied source managers.
|
||||
|
||||
For more information, consult the stdio source and destination managers
|
||||
in jdatasrc.c and jdatadst.c.
|
||||
For more information, consult the memory and stdio source and destination
|
||||
managers in jdatasrc.c and jdatadst.c.
|
||||
|
||||
|
||||
I/O suspension
|
||||
@ -2507,6 +2568,8 @@ jpeg_write_scanlines(). Before calling jpeg_start_compress(), you must do
|
||||
the following:
|
||||
* Set cinfo->raw_data_in to TRUE. (It is set FALSE by jpeg_set_defaults().)
|
||||
This notifies the library that you will be supplying raw data.
|
||||
Furthermore, set cinfo->do_fancy_downsampling to FALSE if you want to use
|
||||
real downsampled data. (It is set TRUE by jpeg_set_defaults().)
|
||||
* Ensure jpeg_color_space is correct --- an explicit jpeg_set_colorspace()
|
||||
call is a good idea. Note that since color conversion is bypassed,
|
||||
in_color_space is ignored, except that jpeg_set_defaults() uses it to
|
||||
@ -2565,16 +2628,17 @@ destination module suspends, jpeg_write_raw_data() will return 0.
|
||||
In this case the same data rows must be passed again on the next call.
|
||||
|
||||
|
||||
Decompression with raw data output implies bypassing all postprocessing:
|
||||
you cannot ask for rescaling or color quantization, for instance. More
|
||||
seriously, you must deal with the color space and sampling factors present in
|
||||
the incoming file. If your application only handles, say, 2h1v YCbCr data,
|
||||
Decompression with raw data output implies bypassing all postprocessing.
|
||||
You must deal with the color space and sampling factors present in the
|
||||
incoming file. If your application only handles, say, 2h1v YCbCr data,
|
||||
you must check for and fail on other color spaces or other sampling factors.
|
||||
The library will not convert to a different color space for you.
|
||||
|
||||
To obtain raw data output, set cinfo->raw_data_out = TRUE before
|
||||
jpeg_start_decompress() (it is set FALSE by jpeg_read_header()). Be sure to
|
||||
verify that the color space and sampling factors are ones you can handle.
|
||||
Furthermore, set cinfo->do_fancy_upsampling = FALSE if you want to get real
|
||||
downsampled data (it is set TRUE by jpeg_read_header()).
|
||||
Then call jpeg_read_raw_data() in place of jpeg_read_scanlines(). The
|
||||
decompression process is otherwise the same as usual.
|
||||
|
||||
@ -2608,7 +2672,7 @@ entire image into a set of virtual coefficient-block arrays, one array per
|
||||
component. The return value is a pointer to an array of virtual-array
|
||||
descriptors. Each virtual array can be accessed directly using the JPEG
|
||||
memory manager's access_virt_barray method (see Memory management, below,
|
||||
and also read structure.doc's discussion of virtual array handling). Or,
|
||||
and also read structure.txt's discussion of virtual array handling). Or,
|
||||
for simple transcoding to a different JPEG file format, the array list can
|
||||
just be handed directly to jpeg_write_coefficients().
|
||||
|
||||
@ -2752,7 +2816,7 @@ Memory management
|
||||
-----------------
|
||||
|
||||
This section covers some key facts about the JPEG library's built-in memory
|
||||
manager. For more info, please read structure.doc's section about the memory
|
||||
manager. For more info, please read structure.txt's section about the memory
|
||||
manager, and consult the source code if necessary.
|
||||
|
||||
All memory and temporary file allocation within the library is done via the
|
||||
@ -2867,7 +2931,7 @@ BITS_IN_JSAMPLE as 12 rather than 8. Note that this causes JSAMPLE to be
|
||||
larger than a char, so it affects the surrounding application's image data.
|
||||
The sample applications cjpeg and djpeg can support 12-bit mode only for PPM
|
||||
and GIF file formats; you must disable the other file formats to compile a
|
||||
12-bit cjpeg or djpeg. (install.doc has more information about that.)
|
||||
12-bit cjpeg or djpeg. (install.txt has more information about that.)
|
||||
At present, a 12-bit library can handle *only* 12-bit images, not both
|
||||
precisions. (If you need to include both 8- and 12-bit libraries in a single
|
||||
application, you could probably do it by defining NEED_SHORT_EXTERNAL_NAMES
|
||||
@ -2920,7 +2984,7 @@ about them.)
|
||||
|
||||
The code works fine on ANSI C, C++, and pre-ANSI C compilers, using any of
|
||||
the popular system include file setups, and some not-so-popular ones too.
|
||||
See install.doc for configuration procedures.
|
||||
See install.txt for configuration procedures.
|
||||
|
||||
The code is not dependent on the exact sizes of the C data types. As
|
||||
distributed, we make the assumptions that
|
||||
@ -2959,7 +3023,7 @@ The code generally assumes that C names must be unique in the first 15
|
||||
characters. However, global function names can be made unique in the
|
||||
first 6 characters by defining NEED_SHORT_EXTERNAL_NAMES.
|
||||
|
||||
More info about porting the code may be gleaned by reading jconfig.doc,
|
||||
More info about porting the code may be gleaned by reading jconfig.txt,
|
||||
jmorecfg.h, and jinclude.h.
|
||||
|
||||
|
@ -1,28 +1,26 @@
|
||||
# DO NOT DELETE
|
||||
|
||||
jmemnobs.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jmemnobs.o: jmemsys.h
|
||||
jaricom.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcapimin.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcapistd.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcarith.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jccoefct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jccolor.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcdctmgr.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcdctmgr.o: jdct.h
|
||||
jchuff.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jchuff.o: jchuff.h
|
||||
jcinit.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcmainct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcmarker.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcmaster.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcomapi.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcparam.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcphuff.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcphuff.o: jchuff.h
|
||||
jcprepct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jcsample.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jctrans.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdapimin.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdapistd.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdarith.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdatadst.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdatasrc.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdcoefct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
@ -30,14 +28,11 @@ jdcolor.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jddctmgr.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jddctmgr.o: jdct.h
|
||||
jdhuff.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdhuff.o: jdhuff.h
|
||||
jdinput.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdmainct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdmarker.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdmaster.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdmerge.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdphuff.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdphuff.o: jdhuff.h
|
||||
jdpostct.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdsample.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jdtrans.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
@ -55,10 +50,10 @@ jidctfst.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jidctfst.o: jdct.h
|
||||
jidctint.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jidctint.o: jdct.h
|
||||
jidctred.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jidctred.o: jdct.h
|
||||
jmemmgr.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jmemmgr.o: jmemsys.h
|
||||
jmemnobs.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jmemnobs.o: jmemsys.h
|
||||
jquant1.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jquant2.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jutils.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jmemmgr.o: jinclude.h jconfig.h jpeglib.h jmorecfg.h jpegint.h jerror.h
|
||||
jmemmgr.o: jmemsys.h
|
||||
|
@ -1,6 +1,6 @@
|
||||
IJG JPEG LIBRARY: SYSTEM ARCHITECTURE
|
||||
|
||||
Copyright (C) 1991-1995, Thomas G. Lane.
|
||||
Copyright (C) 1991-2009, Thomas G. Lane, Guido Vollbeding.
|
||||
This file is part of the Independent JPEG Group's software.
|
||||
For conditions of distribution and use, see the accompanying README file.
|
||||
|
||||
@ -12,9 +12,9 @@ convention, see the include files and comments in the source code.
|
||||
|
||||
We assume that the reader is already somewhat familiar with the JPEG standard.
|
||||
The README file includes references for learning about JPEG. The file
|
||||
libjpeg.doc describes the library from the viewpoint of an application
|
||||
libjpeg.txt describes the library from the viewpoint of an application
|
||||
programmer using the library; it's best to read that file before this one.
|
||||
Also, the file coderules.doc describes the coding style conventions we use.
|
||||
Also, the file coderules.txt describes the coding style conventions we use.
|
||||
|
||||
In this document, JPEG-specific terminology follows the JPEG standard:
|
||||
A "component" means a color channel, e.g., Red or Luminance.
|
||||
@ -60,9 +60,6 @@ we treat 8-bit vs. 12-bit data precision as a compile-time switch, not a
|
||||
run-time option, because most machines can store 8-bit pixels much more
|
||||
compactly than 12-bit.
|
||||
|
||||
For legal reasons, JPEG arithmetic coding is not currently supported, but
|
||||
extending the library to include it would be straightforward.
|
||||
|
||||
By itself, the library handles only interchange JPEG datastreams --- in
|
||||
particular the widely used JFIF file format. The library can be used by
|
||||
surrounding code to process interchange or abbreviated JPEG datastreams that
|
||||
@ -457,8 +454,8 @@ shown are:
|
||||
buffered by the coefficient controller have NOT been dequantized; we
|
||||
merge dequantization and inverse DCT into a single step for speed reasons.
|
||||
When scaled-down output is asked for, simplified DCT algorithms may be used
|
||||
that emit only 1x1, 2x2, or 4x4 samples per DCT block, not the full 8x8.
|
||||
Works on one DCT block at a time.
|
||||
that need fewer coefficients and emit fewer samples per DCT block, not the
|
||||
full 8x8. Works on one DCT block at a time.
|
||||
|
||||
* Postprocessing controller: buffer controller for the color quantization
|
||||
input buffer, when quantization is in use. (Without quantization, this
|
||||
@ -541,7 +538,7 @@ section needs more data.) In this way the application can avoid making
|
||||
extra display passes when data is arriving faster than the display pass
|
||||
can run. Furthermore, it is possible to abort an output pass without
|
||||
losing anything, since the coefficient buffer is read-only as far as the
|
||||
output section is concerned. See libjpeg.doc for more detail.
|
||||
output section is concerned. See libjpeg.txt for more detail.
|
||||
|
||||
A full-image coefficient array is only created if the JPEG file has multiple
|
||||
scans (or if the application specifies buffered-image mode anyway). When
|
||||
@ -589,8 +586,7 @@ as "((value) & 0xFF)" on signed-char machines and "((int) (value))" elsewhere.
|
||||
With these conventions, JSAMPLE values can be assumed to be >= 0. This helps
|
||||
simplify correct rounding during downsampling, etc. The JPEG standard's
|
||||
specification that sample values run from -128..127 is accommodated by
|
||||
subtracting 128 just as the sample value is copied into the source array for
|
||||
the DCT step (this will be an array of signed ints). Similarly, during
|
||||
subtracting 128 from the sample value in the DCT step. Similarly, during
|
||||
decompression the output of the IDCT step will be immediately shifted back to
|
||||
0..255. (NB: different values are required when 12-bit samples are in use.
|
||||
The code is written in terms of MAXJSAMPLE and CENTERJSAMPLE, which will be
|
||||
@ -685,7 +681,7 @@ then resume compression or decompression at a later time.
|
||||
|
||||
This scenario is supported for simple cases. (For anything more complex, we
|
||||
recommend that the application "bite the bullet" and develop real multitasking
|
||||
capability.) The libjpeg.doc file goes into more detail about the usage and
|
||||
capability.) The libjpeg.txt file goes into more detail about the usage and
|
||||
limitations of this capability; here we address the implications for library
|
||||
structure.
|
||||
|
||||
@ -733,13 +729,14 @@ to bypass COM and APPn markers, so these can be larger than the buffer size
|
||||
without causing problems; otherwise a 64K buffer would be needed in the worst
|
||||
case.)
|
||||
|
||||
The JPEG marker writer currently does *not* cope with suspension. I feel that
|
||||
this is not necessary; it is much easier simply to require the application to
|
||||
ensure there is enough buffer space before starting. (An empty 2K buffer is
|
||||
more than sufficient for the header markers; and ensuring there are a dozen or
|
||||
two bytes available before calling jpeg_finish_compress() will suffice for the
|
||||
trailer.) This would not work for writing multi-scan JPEG files, but
|
||||
we simply do not intend to support that capability with suspension.
|
||||
The JPEG marker writer currently does *not* cope with suspension.
|
||||
We feel that this is not necessary; it is much easier simply to require
|
||||
the application to ensure there is enough buffer space before starting. (An
|
||||
empty 2K buffer is more than sufficient for the header markers; and ensuring
|
||||
there are a dozen or two bytes available before calling jpeg_finish_compress()
|
||||
will suffice for the trailer.) This would not work for writing multi-scan
|
||||
JPEG files, but we simply do not intend to support that capability with
|
||||
suspension.
|
||||
|
||||
|
||||
*** Memory manager services ***
|
@ -12,19 +12,9 @@ pages in files cjpeg.1, djpeg.1, jpegtran.1, rdjpgcom.1, wrjpgcom.1.
|
||||
|
||||
INTRODUCTION
|
||||
|
||||
These programs implement JPEG image compression and decompression. JPEG
|
||||
(pronounced "jay-peg") is a standardized compression method for full-color
|
||||
and gray-scale images. JPEG is designed to handle "real-world" scenes,
|
||||
for example scanned photographs. Cartoons, line drawings, and other
|
||||
non-realistic images are not JPEG's strong suit; on that sort of material
|
||||
you may get poor image quality and/or little compression.
|
||||
|
||||
JPEG is lossy, meaning that the output image is not necessarily identical to
|
||||
the input image. Hence you should not use JPEG if you have to have identical
|
||||
output bits. However, on typical real-world images, very good compression
|
||||
levels can be obtained with no visible change, and amazingly high compression
|
||||
is possible if you can tolerate a low-quality image. You can trade off image
|
||||
quality against file size by adjusting the compressor's "quality" setting.
|
||||
These programs implement JPEG image encoding, decoding, and transcoding.
|
||||
JPEG (pronounced "jay-peg") is a standardized compression method for
|
||||
full-color and gray-scale images.
|
||||
|
||||
|
||||
GENERAL USAGE
|
||||
@ -48,7 +38,7 @@ or
|
||||
i.e., both the input and output files are named on the command line. This
|
||||
style is a little more foolproof, and it loses no functionality if you don't
|
||||
have pipes. (You can get this style on Unix too, if you prefer, by defining
|
||||
TWO_FILE_COMMANDLINE when you compile the programs; see install.doc.)
|
||||
TWO_FILE_COMMANDLINE when you compile the programs; see install.txt.)
|
||||
|
||||
You can also say:
|
||||
cjpeg [switches] -outfile jpegfile imagefile
|
||||
@ -76,7 +66,7 @@ CJPEG DETAILS
|
||||
|
||||
The basic command line switches for cjpeg are:
|
||||
|
||||
-quality N Scale quantization tables to adjust image quality.
|
||||
-quality N[,...] Scale quantization tables to adjust image quality.
|
||||
Quality is 0 (worst) to 100 (best); default is 75.
|
||||
(See below for more info.)
|
||||
|
||||
@ -96,6 +86,10 @@ The basic command line switches for cjpeg are:
|
||||
|
||||
-progressive Create progressive JPEG file (see below).
|
||||
|
||||
-scale M/N Scale the output image by a factor M/N. Currently
|
||||
supported scale factors are 8/N with all N from 1 to
|
||||
16.
|
||||
|
||||
-targa Input file is Targa format. Targa files that contain
|
||||
an "identification" field will not be automatically
|
||||
recognized by cjpeg; for such files you must specify
|
||||
@ -128,15 +122,31 @@ cjpeg emits a warning message when you give such a quality value, because some
|
||||
other JPEG programs may be unable to decode the resulting file. Use -baseline
|
||||
if you need to ensure compatibility at low quality values.)
|
||||
|
||||
The -quality option has been extended in IJG version 7 for support of separate
|
||||
quality settings for luminance and chrominance (or in general, for every
|
||||
provided quantization table slot). This feature is useful for high-quality
|
||||
applications which cannot accept the damage of color data by coarse
|
||||
subsampling settings. You can now easily reduce the color data amount more
|
||||
smoothly with finer control without separate subsampling. The resulting file
|
||||
is fully compliant with standard JPEG decoders.
|
||||
Note that the -quality ratings refer to the quantization table slots, and that
|
||||
the last value is replicated if there are more q-table slots than parameters.
|
||||
The default q-table slots are 0 for luminance and 1 for chrominance with
|
||||
default tables as given in the JPEG standard. This is compatible with the old
|
||||
behaviour in case that only one parameter is given, which is then used for
|
||||
both luminance and chrominance (slots 0 and 1). More or custom quantization
|
||||
tables can be set with -qtables and assigned to components with -qslots
|
||||
parameter (see the "wizard" switches below).
|
||||
CAUTION: You must explicitly add -sample 1x1 for efficient separate color
|
||||
quality selection, since the default value used by library is 2x2!
|
||||
|
||||
The -progressive switch creates a "progressive JPEG" file. In this type of
|
||||
JPEG file, the data is stored in multiple scans of increasing quality. If the
|
||||
file is being transmitted over a slow communications link, the decoder can use
|
||||
the first scan to display a low-quality image very quickly, and can then
|
||||
improve the display with each subsequent scan. The final image is exactly
|
||||
equivalent to a standard JPEG file of the same quality setting, and the total
|
||||
file size is about the same --- often a little smaller. CAUTION: progressive
|
||||
JPEG is not yet widely implemented, so many decoders will be unable to view a
|
||||
progressive JPEG file at all.
|
||||
file size is about the same --- often a little smaller.
|
||||
|
||||
Switches for advanced users:
|
||||
|
||||
@ -151,6 +161,8 @@ Switches for advanced users:
|
||||
the same results everywhere. The fast integer method
|
||||
is much less accurate than the other two.
|
||||
|
||||
-nosmooth Don't use high-quality downsampling.
|
||||
|
||||
-restart N Emit a JPEG restart marker every N MCU rows, or every
|
||||
N MCU blocks if "B" is attached to the number.
|
||||
-restart 0 (the default) means no restart markers.
|
||||
@ -184,6 +196,11 @@ factor will visibly blur the image, however.
|
||||
|
||||
Switches for wizards:
|
||||
|
||||
-arithmetic Use arithmetic coding. CAUTION: arithmetic coded JPEG
|
||||
is not yet widely implemented, so many decoders will
|
||||
be unable to view an arithmetic coded JPEG file at
|
||||
all.
|
||||
|
||||
-baseline Force baseline-compatible quantization tables to be
|
||||
generated. This clamps quantization values to 8 bits
|
||||
even at low quality settings. (This switch is poorly
|
||||
@ -203,7 +220,7 @@ Switches for wizards:
|
||||
|
||||
The "wizard" switches are intended for experimentation with JPEG. If you
|
||||
don't know what you are doing, DON'T USE THEM. These switches are documented
|
||||
further in the file wizard.doc.
|
||||
further in the file wizard.txt.
|
||||
|
||||
|
||||
DJPEG DETAILS
|
||||
@ -228,10 +245,15 @@ The basic command line switches for djpeg are:
|
||||
djpeg runs noticeably faster in this mode.
|
||||
|
||||
-scale M/N Scale the output image by a factor M/N. Currently
|
||||
the scale factor must be 1/1, 1/2, 1/4, or 1/8.
|
||||
Scaling is handy if the image is larger than your
|
||||
screen; also, djpeg runs much faster when scaling
|
||||
down the output.
|
||||
supported scale factors are M/N with all M from 1 to
|
||||
16, where N is the source DCT size, which is 8 for
|
||||
baseline JPEG. If the /N part is omitted, then M
|
||||
specifies the DCT scaled size to be applied on the
|
||||
given input. For baseline JPEG this is equivalent to
|
||||
M/8 scaling, since the source DCT size for baseline
|
||||
JPEG is 8. Scaling is handy if the image is larger
|
||||
than your screen; also, djpeg runs much faster when
|
||||
scaling down the output.
|
||||
|
||||
-bmp Select BMP output format (Windows flavor). 8-bit
|
||||
colormapped format is emitted if -colors or -grayscale
|
||||
@ -292,7 +314,7 @@ Switches for advanced users:
|
||||
or PPM file. This option overrides -colors and
|
||||
-onepass.
|
||||
|
||||
-nosmooth Use a faster, lower-quality upsampling routine.
|
||||
-nosmooth Don't use high-quality upsampling.
|
||||
|
||||
-onepass Use one-pass instead of two-pass color quantization.
|
||||
The one-pass method is faster and needs less memory,
|
||||
@ -333,8 +355,7 @@ is often a lot more than it is on larger files. (At present, -optimize
|
||||
mode is always selected when generating progressive JPEG files.)
|
||||
|
||||
GIF input files are no longer supported, to avoid the Unisys LZW patent.
|
||||
Use a Unisys-licensed program if you need to read a GIF file. (Conversion
|
||||
of GIF files to JPEG is usually a bad idea anyway.)
|
||||
(Conversion of GIF files to JPEG is usually a bad idea anyway.)
|
||||
|
||||
|
||||
HINTS FOR DJPEG
|
||||
@ -426,6 +447,7 @@ jpegtran accepts a subset of the switches recognized by cjpeg:
|
||||
-progressive Create progressive JPEG file.
|
||||
-restart N Emit a JPEG restart marker every N MCU rows, or every
|
||||
N MCU blocks if "B" is attached to the number.
|
||||
-arithmetic Use arithmetic coding.
|
||||
-scans file Use the scan script given in the specified text file.
|
||||
See the previous discussion of cjpeg for more details about these switches.
|
||||
If you specify none of these switches, you get a plain baseline-JPEG output
|
||||
@ -466,7 +488,28 @@ equivalences between the transformations no longer hold. For example,
|
||||
"-rot 270 -trim" trims only the bottom edge, but "-rot 90 -trim" followed by
|
||||
"-rot 180 -trim" trims both edges.
|
||||
|
||||
Another not-strictly-lossless transformation switch is:
|
||||
If you are only interested in perfect transformation, add the -perfect switch:
|
||||
-perfect Fails with an error if the transformation is not
|
||||
perfect.
|
||||
For example you may want to do
|
||||
jpegtran -rot 90 -perfect foo.jpg || djpeg foo.jpg | pnmflip -r90 | cjpeg
|
||||
to do a perfect rotation if available or an approximated one if not.
|
||||
|
||||
We also offer a lossless-crop option, which discards data outside a given
|
||||
image region but losslessly preserves what is inside. Like the rotate and
|
||||
flip transforms, lossless crop is restricted by the current JPEG format: the
|
||||
upper left corner of the selected region must fall on an iMCU boundary. If
|
||||
this does not hold for the given crop parameters, we silently move the upper
|
||||
left corner up and/or left to make it so, simultaneously increasing the region
|
||||
dimensions to keep the lower right crop corner unchanged. (Thus, the output
|
||||
image covers at least the requested region, but may cover more.)
|
||||
|
||||
The image can be losslessly cropped by giving the switch:
|
||||
-crop WxH+X+Y Crop to a rectangular subarea of width W, height H
|
||||
starting at point X,Y.
|
||||
|
||||
Other not-strictly-lossless transformation switches are:
|
||||
|
||||
-grayscale Force grayscale output.
|
||||
This option discards the chrominance channels if the input image is YCbCr
|
||||
(ie, a standard color JPEG), resulting in a grayscale JPEG file. The
|
||||
@ -477,6 +520,16 @@ encoded as a color JPEG. (In such a case, the space savings from getting rid
|
||||
of the near-empty chroma channels won't be large; but the decoding time for
|
||||
a grayscale JPEG is substantially less than that for a color JPEG.)
|
||||
|
||||
-scale M/N Scale the output image by a factor M/N.
|
||||
Currently supported scale factors are M/N with all M from 1 to 16, where N is
|
||||
the source DCT size, which is 8 for baseline JPEG. If the /N part is omitted,
|
||||
then M specifies the DCT scaled size to be applied on the given input. For
|
||||
baseline JPEG this is equivalent to M/8 scaling, since the source DCT size
|
||||
for baseline JPEG is 8. CAUTION: An implementation of the JPEG SmartScale
|
||||
extension is required for this feature. SmartScale enabled JPEG is not yet
|
||||
widely implemented, so many decoders will be unable to view a SmartScale
|
||||
extended JPEG file at all.
|
||||
|
||||
jpegtran also recognizes these switches that control what to do with "extra"
|
||||
markers, such as comment blocks:
|
||||
-copy none Copy no extra markers from source file. This setting
|
||||
@ -484,11 +537,11 @@ markers, such as comment blocks:
|
||||
present in the source file.
|
||||
-copy comments Copy only comment markers. This setting copies
|
||||
comments from the source file, but discards
|
||||
any other inessential data.
|
||||
any other inessential (for image display) data.
|
||||
-copy all Copy all extra markers. This setting preserves
|
||||
miscellaneous markers found in the source file, such
|
||||
as JFIF thumbnails and Photoshop settings. In some
|
||||
files these extra markers can be sizable.
|
||||
as JFIF thumbnails, Exif data, and Photoshop settings.
|
||||
In some files these extra markers can be sizable.
|
||||
The default behavior is -copy comments. (Note: in IJG releases v6 and v6a,
|
||||
jpegtran always did the equivalent of -copy none.)
|
||||
|
||||
@ -515,7 +568,9 @@ blocks to a JPEG file.
|
||||
|
||||
rdjpgcom searches a JPEG file and prints the contents of any COM blocks on
|
||||
standard output. The command line syntax is
|
||||
rdjpgcom [-verbose] [inputfilename]
|
||||
rdjpgcom [-raw] [-verbose] [inputfilename]
|
||||
The switch "-raw" (or just "-r") causes rdjpgcom to also output non-printable
|
||||
characters in comments, which are normally escaped for security reasons.
|
||||
The switch "-verbose" (or just "-v") causes rdjpgcom to also display the JPEG
|
||||
image dimensions. If you omit the input file name from the command line,
|
||||
the JPEG file is read from standard input. (This may not work on some
|
Loading…
Reference in New Issue
Block a user