mirror of https://github.com/freetype/freetype
updated the CHANGES file
+ some basic formatting cleaning
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David Turner
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87
CHANGES
87
CHANGES
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@ -1,14 +1,22 @@
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This file summarizes the changes that occured since the last "beta" of FreeType 2.
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Because the list is important, it has been divided into separate sections:
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Table Of Contents:
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I High-Level Interface (easier !)
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II Directory Structure
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III Glyph Image Formats
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IV Build System
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V Portability
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VI Font Drivers
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-----------------------------------------------------------------------------------------
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High-Level Interface :
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The high-level API has been considerably simplified. Here is how :
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- resource objects have disappeared. this means that face objects can now
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be created with a single function call (see FT_New_Face and
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- resource objects have disappeared. this means that face objects can
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now be created with a single function call (see FT_New_Face and
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FT_Open_Face)
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- when calling either FT_New_Face & FT_Open_Face, a size object and a
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@ -29,6 +37,7 @@ High-Level Interface :
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ft_encoding_apple_roman
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ft_encoding_sjis
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ft_encoding_adobe_standard
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ft_encoding_adobe_expert
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other values may be added in the future. Each charmap still holds its
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"platform_id" and "encoding_id" values in case the encoding is too
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@ -43,7 +52,7 @@ Directory Structure:
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freetype/
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config/ -- configuration sub-makefiles
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ansi/
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unix/
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unix/ -- platform-specific configuration files
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win32/
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os2/
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msdos/
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@ -75,12 +84,12 @@ Glyph Image Formats :
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bitmap types.
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Each new image format must provide at least one "raster", i.e. a module
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capable of transforming the glyph image into a bitmap. It is also possible
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capable of transforming the glyph image into a bitmap. It's also possible
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to change the default raster used for a given glyph image format.
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The default outline scan-converter now uses 128 levels of grays by default,
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which tends to smooth many things. Note that the demo programs have been
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updated significantly to be able to display these..
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updated significantly in order to display these..
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-----------------------------------------------------------------------------------------
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@ -167,10 +176,72 @@ Portability :
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-----------------------------------------------------------------------------------------
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Drivers Interface :
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(To be written)
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Font Drivers :
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The Font Driver interface has been modified in order to support
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extensions & versioning.
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The list of the font drivers that are statically linked to the
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library at compile time is managed through a new configuration file
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called `config/<platform>/ftmodule.h'.
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This file is autogenerated when invoking `make modules'. This target
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will parse all sub-directories of 'src', looking for a "module.mk"
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rules file, used to describe the driver to the build system.
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Hence, one should call `make modules' each time a font driver is added
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or removed from the `src' directory.
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Finally, this version provides a "pseudo-driver" in `src/sfnt'. This
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driver doesn't support font files directly, but provides services used
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by all TrueType-like font drivers. Hence, its code is shared between
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the TrueType & OpenType font formats, and possibly more formats to
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come if we're lucky..
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-----------------------------------------------------------------------------------------
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Extensions support :
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(To be defined)
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The extensions support is inspired by the one found in 1.x.
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Now, each font driver has its own "extension registry", which lists
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which extensions are available for the font faces managed by the driver.
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Extension ids are now strings, rather than 4-byte tags, as this is
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usually more readable..
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Each extension has:
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- some data, associated to each face object
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- an interface (table of function pointers)
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An extension that is format-specific should simply register itself
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to the correct font driver. Here is some example code:
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// Registering an extensions
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//
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FT_Error FT_Init_XXXX_Extension( FT_Library library )
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{
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FT_DriverInterface* tt_driver;
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driver = FT_Get_Driver( library, "truetype" );
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if (!driver) return FT_Err_Unimplemented_Feature;
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return FT_Register_Extension( driver, &extension_class );
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}
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// Implementing the extensions
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//
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FT_Error FT_Proceed_Extension_XXX( FT_Face face )
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{
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FT_XXX_Extension ext;
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FT_XXX_Extension_Interface ext_interface;
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ext = FT_Get_Extension( face, "extensionid", &ext_interface );
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if (!ext) return error;
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return ext_interface->do_it(ext);
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}
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@ -29,7 +29,6 @@
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/* The extensions don't need to be integrated at compile time into */
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/* the engine, only at link time. */
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/*****************************************************************
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*
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* <FuncType>
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