157 lines
5.1 KiB
C
157 lines
5.1 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 <ft2build.h>
|
|
#include FT_FREETYPE_H
|
|
|
|
FT_BEGIN_HEADER
|
|
|
|
|
|
/* utility macros */
|
|
#define TT_Err_Ok FT_Err_Ok
|
|
#define TT_Err_Invalid_Argument FT_Err_Invalid_Argument
|
|
#define TT_Err_Invalid_Face_Handle FT_Err_Invalid_Face_Handle
|
|
#define TT_Err_Table_Missing FT_Err_Table_Missing
|
|
|
|
#define SET_ERR(c) ( (error = (c)) != 0 )
|
|
|
|
#ifndef FTGLUE_API
|
|
#define FTGLUE_API(x) extern 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() ftglue_stream_get_byte( stream )
|
|
#define GET_Short() ftglue_stream_get_short( stream )
|
|
#define GET_Long() ftglue_stream_get_long( stream )
|
|
|
|
#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()
|
|
|
|
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_Byte )
|
|
ftglue_stream_get_byte( FT_Stream stream );
|
|
|
|
FTGLUE_API( FT_Short )
|
|
ftglue_stream_get_short( FT_Stream stream );
|
|
|
|
FTGLUE_API( FT_Long )
|
|
ftglue_stream_get_long( FT_Stream stream );
|
|
|
|
FTGLUE_API( FT_Error )
|
|
ftglue_face_goto_table( FT_Face face,
|
|
FT_ULong tag,
|
|
FT_Stream stream );
|
|
|
|
/* memory macros used by the OpenType parser */
|
|
#define ALLOC(_ptr,_size) \
|
|
( (_ptr) = ftglue_alloc( memory, _size, &error ), error != 0 )
|
|
|
|
#define REALLOC(_ptr,_oldsz,_newsz) \
|
|
( (_ptr) = ftglue_realloc( memory, (_ptr), (_oldsz), (_newsz), &error ), error != 0 )
|
|
|
|
#define FREE(_ptr) \
|
|
FT_BEGIN_STMNT \
|
|
if ( (_ptr) ) \
|
|
{ \
|
|
ftglue_free( memory, _ptr ); \
|
|
_ptr = NULL; \
|
|
} \
|
|
FT_END_STMNT
|
|
|
|
#define ALLOC_ARRAY(_ptr,_count,_type) \
|
|
ALLOC(_ptr,(_count)*sizeof(_type))
|
|
|
|
#define REALLOC_ARRAY(_ptr,_oldcnt,_newcnt,_type) \
|
|
REALLOC(_ptr,(_oldcnt)*sizeof(_type),(_newcnt)*sizeof(_type))
|
|
|
|
#define MEM_Copy(dest,source,count) memcpy( (char*)(dest), (const char*)(source), (size_t)(count) )
|
|
|
|
|
|
FTGLUE_API( FT_Pointer )
|
|
ftglue_alloc( FT_Memory memory,
|
|
FT_ULong size,
|
|
FT_Error *perror );
|
|
|
|
FTGLUE_API( FT_Pointer )
|
|
ftglue_realloc( FT_Memory memory,
|
|
FT_Pointer block,
|
|
FT_ULong old_size,
|
|
FT_ULong new_size,
|
|
FT_Error *perror );
|
|
|
|
FTGLUE_API( void )
|
|
ftglue_free( FT_Memory memory,
|
|
FT_Pointer block );
|
|
|
|
/* */
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __OPENTYPE_FTGLUE_H__ */
|