mirror of https://github.com/freetype/freetype
Updates to the Type 1 driver
Now with a simple AFM parser in order to read the kerning table..
This commit is contained in:
David Turner
parent
51d4e28daf
commit
afdc4c4c2b
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@ -103,6 +103,7 @@ T1_DRV_SRC := $(T1_DIR_)t1objs.c \
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$(T1_DIR_)t1driver.c \
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$(T1_DIR_)t1encode.c \
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$(T1_DIR_)t1hinter.c \
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$(T1_DIR_)t1afm.c \
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$(T1_DIR_)t1gload.c
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@ -40,6 +40,13 @@
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/* Define T1_CONFIG_OPTION_DISABLE_HINTER if you want to generate */
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/* a driver with no hinter. This can be useful to debug the parser */
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/* */
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#undef T1_CONFIG_OPTION_DISABLE_HINTER
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#define T1_CONFIG_OPTION_DISABLE_HINTER
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/* Define this configuration macro if you want to prevent the */
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/* compilation of "t1afm", which is in charge of reading Type1 */
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/* AFM files into an existing face. Note that when set, the T1 */
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/* driver will be unable to produce kerning distances.. */
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/* */
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#define T1_CONFIG_OPTION_NO_AFM
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#endif /* T1CONFIG_H */
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@ -17,6 +17,7 @@
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#include <t1driver.h>
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#include <t1gload.h>
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#include <t1afm.h>
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#include <ftdebug.h>
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#include <ftstream.h>
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@ -25,6 +26,97 @@
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_t1driver
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#ifndef T1_CONFIG_OPTION_NO_AFM
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/*************************************************************************/
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/* */
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/* <Function> */
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/* Get_Interface */
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/* */
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/* <Description> */
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/* Each driver can provide one or more extensions to the base */
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/* FreeType API. These can be used to access format specific */
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/* features (e.g., all TrueType/OpenType resources share a common */
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/* file structure and common tables which can be accessed through the */
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/* `sfnt' interface), or more simply generic ones (e.g., the */
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/* `postscript names' interface which can be used to retrieve the */
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/* PostScript name of a given glyph index). */
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/* */
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/* <InOut> */
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/* driver :: A handle to a driver object. */
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/* */
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/* <Input> */
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/* interface :: A string designing the interface. Examples are */
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/* `sfnt', `post_names', `charmaps', etc. */
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/* */
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/* <Return> */
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/* A typeless pointer to the extension's interface (normally a table */
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/* of function pointers). Returns NULL if the requested extension */
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/* isn't available (i.e., wasn't compiled in the driver at build */
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/* time). */
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/* */
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static
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void* Get_Interface)( FT_Driver driver,
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const FT_String* interface )
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{
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if ( strcmp( (const char*)interface, "attach_file" ) == 0 )
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return T1_Read_AFM;
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return 0;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* Get_Kerning */
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/* */
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/* <Description> */
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/* A driver method used to return the kerning vector between two */
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/* glyphs of the same face. */
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/* */
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/* <Input> */
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/* face :: A handle to the source face object. */
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/* */
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/* left_glyph :: The index of the left glyph in the kern pair. */
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/* */
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/* right_glyph :: The index of the right glyph in the kern pair. */
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/* */
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/* <Output> */
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/* kerning :: The kerning vector. This is in font units for */
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/* scalable formats, and in pixels for fixed-sizes */
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/* formats. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* Only horizontal layouts (left-to-right & right-to-left) are */
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/* supported by this function. Other layouts, or more sophisticated */
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/* kernings are out of scope of this method (the basic driver */
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/* interface is meant to be simple). */
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/* */
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/* They can be implemented by format-specific interfaces. */
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/* */
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static
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T1_Error Get_Kerning( T1_Face face,
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T1_UInt left_glyph,
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T1_UInt right_glyph,
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T1_Vector* kerning )
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{
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T1_AFM* afm;
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kerning->x = 0;
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kerning->y = 0;
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afm = (T1_AFM*)face->afm_data;
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if (afm)
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T1_Get_Kerning( afm, left_glyph, right_glyph, kerning );
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return T1_Err_Ok;
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}
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#endif
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/******************************************************************/
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/* */
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/* <Function> Set_Char_Sizes */
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@ -394,11 +486,21 @@
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(FTDriver_initDriver) T1_Init_Driver,
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(FTDriver_doneDriver) T1_Done_Driver,
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#ifdef T1_CONFIG_OPTION_NO_AFM
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(FTDriver_getInterface) 0,
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#else
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(FTDriver_getInterface) Get_Interface,
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#endif
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(FTDriver_initFace) Init_Face,
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(FTDriver_doneFace) T1_Done_Face,
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#ifdef T1_CONFIG_OPTION_NO_AFM
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(FTDriver_getKerning) 0,
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#else
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(FTDriver_getKerning) Get_Kerning,
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#endif
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(FTDriver_initSize) T1_Init_Size,
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(FTDriver_doneSize) T1_Done_Size,
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@ -42,9 +42,14 @@
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#include <t1objs.c>
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#include <t1load.c> /* table loader */
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#include <t1gload.c>
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#include <t1tokens.c>
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#include <t1parse.c>
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#include <t1encode.c>
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#include <t1hinter.c>
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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#include <t1hinter.c>
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#endif
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#ifndef T1_CONFIG_OPTION_NO_AFM
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#include <t1afm.c>
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#endif
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