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