112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* ftglue.c: Glue code for compiling the OpenType code from
|
|
* FreeType 1 using only the public API of FreeType 2
|
|
*
|
|
* By David Turner, The FreeType Project (www.freetype.org)
|
|
*
|
|
* This code is explicitely put in the public domain
|
|
*
|
|
* ==========================================================================
|
|
*
|
|
* the OpenType parser codes was originally written as an extension to
|
|
* FreeType 1.x. As such, its source code was embedded within the library,
|
|
* and used many internal FreeType functions to deal with memory and
|
|
* stream i/o.
|
|
*
|
|
* When it was 'salvaged' for Pango and Qt, the code was "ported" to FreeType 2,
|
|
* which basically means that some macro tricks were performed in order to
|
|
* directly access FT2 _internal_ functions.
|
|
*
|
|
* these functions were never part of FT2 public API, and _did_ change between
|
|
* various releases. This created chaos for many users: when they upgraded the
|
|
* FreeType library on their system, they couldn't run Gnome anymore since
|
|
* Pango refused to link.
|
|
*
|
|
* Very fortunately, it's possible to completely avoid this problem because
|
|
* the FT_StreamRec and FT_MemoryRec structure types, which describe how
|
|
* memory and stream implementations interface with the rest of the font
|
|
* library, have always been part of the public API, and never changed.
|
|
*
|
|
* What we do thus is re-implement, within the OpenType parser, the few
|
|
* functions that depend on them. This only adds one or two kilobytes of
|
|
* code, and ensures that the parser can work with _any_ version
|
|
* of FreeType installed on your system. How sweet... !
|
|
*
|
|
* Note that we assume that Pango doesn't use any other internal functions
|
|
* from FreeType. It used to in old versions, but this should no longer
|
|
* be the case. (crossing my fingers).
|
|
*
|
|
* - David Turner
|
|
* - The FreeType Project (www.freetype.org)
|
|
*
|
|
* PS: This "glue" code is explicitely put in the public domain
|
|
*/
|
|
#ifndef __OPENTYPE_FTGLUE_H__
|
|
#define __OPENTYPE_FTGLUE_H__
|
|
|
|
#include "fcint.h"
|
|
|
|
#include <ft2build.h>
|
|
#include FT_FREETYPE_H
|
|
|
|
FT_BEGIN_HEADER
|
|
|
|
|
|
#define SET_ERR(c) ( (error = (c)) != 0 )
|
|
|
|
#ifndef FTGLUE_API
|
|
#define FTGLUE_API(x) extern FcPrivate x
|
|
#endif
|
|
|
|
#ifndef FTGLUE_APIDEF
|
|
#define FTGLUE_APIDEF(x) x
|
|
#endif
|
|
|
|
/* stream macros used by the OpenType parser */
|
|
#define FILE_Pos() ftglue_stream_pos( stream )
|
|
#define FILE_Seek(pos) SET_ERR( ftglue_stream_seek( stream, pos ) )
|
|
#define ACCESS_Frame(size) SET_ERR( ftglue_stream_frame_enter( stream, size ) )
|
|
#define FORGET_Frame() ftglue_stream_frame_exit( stream )
|
|
|
|
#define GET_Byte() (*stream->cursor++)
|
|
#define GET_Short() (stream->cursor += 2, (FT_Short)( \
|
|
(*(((FT_Byte*)stream->cursor)-2) << 8) | \
|
|
*(((FT_Byte*)stream->cursor)-1) \
|
|
))
|
|
#define GET_Long() (stream->cursor += 4, (FT_Long)( \
|
|
(*(((FT_Byte*)stream->cursor)-4) << 24) | \
|
|
(*(((FT_Byte*)stream->cursor)-3) << 16) | \
|
|
(*(((FT_Byte*)stream->cursor)-2) << 8) | \
|
|
*(((FT_Byte*)stream->cursor)-1) \
|
|
))
|
|
|
|
#define GET_Char() ((FT_Char)GET_Byte())
|
|
#define GET_UShort() ((FT_UShort)GET_Short())
|
|
#define GET_ULong() ((FT_ULong)GET_Long())
|
|
#define GET_Tag4() GET_ULong()
|
|
|
|
#define FT_SET_ERROR( expression ) \
|
|
( ( error = (expression) ) != 0 )
|
|
|
|
FTGLUE_API( FT_Long )
|
|
ftglue_stream_pos( FT_Stream stream );
|
|
|
|
FTGLUE_API( FT_Error )
|
|
ftglue_stream_seek( FT_Stream stream,
|
|
FT_Long pos );
|
|
|
|
FTGLUE_API( FT_Error )
|
|
ftglue_stream_frame_enter( FT_Stream stream,
|
|
FT_ULong size );
|
|
|
|
FTGLUE_API( void )
|
|
ftglue_stream_frame_exit( FT_Stream stream );
|
|
|
|
FTGLUE_API( FT_Error )
|
|
ftglue_face_goto_table( FT_Face face,
|
|
FT_ULong tag,
|
|
FT_Stream stream );
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __OPENTYPE_FTGLUE_H__ */
|