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Get rid of the use of freetype internal headers in fcfreetype.c, since 

those headers will go away with freetype 2.2. Replace with public
    domain ftglue code from pango. Note that the patch removes some extra
    error checking in FT_Get_BDF_Property() and comments out the skipping
    of empty pcf fonts.
reviewed by: plam
This commit is contained in:
Patrick Lam 2005-11-19 22:37:24 +00:00
parent 8ebf7725a8
commit 824c7bf025
2 changed files with 508 additions and 0 deletions
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349
src/ftglue.c Normal file
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/* 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
*
* See ftglue.h for more information.
*/
#include "ftglue.h"
#if 0
#include <stdio.h>
#define LOG(x) ftglue_log x
static void
ftglue_log( const char* format, ... )
{
va_list ap;
va_start( ap, format );
vfprintf( stderr, format, ap );
va_end( ap );
}
#else
#define LOG(x) do {} while (0)
#endif
/* only used internally */
static FT_Pointer
ftglue_qalloc( FT_Memory memory,
FT_ULong size,
FT_Error *perror )
{
FT_Error error = 0;
FT_Pointer block = NULL;
if ( size > 0 )
{
block = memory->alloc( memory, size );
if ( !block )
error = FT_Err_Out_Of_Memory;
}
*perror = error;
return block;
}
#undef QALLOC /* just in case */
#define QALLOC(ptr,size) ( (ptr) = ftglue_qalloc( memory, (size), &error ), error != 0 )
FTGLUE_APIDEF( FT_Pointer )
ftglue_alloc( FT_Memory memory,
FT_ULong size,
FT_Error *perror )
{
FT_Error error = 0;
FT_Pointer block = NULL;
if ( size > 0 )
{
block = memory->alloc( memory, size );
if ( !block )
error = FT_Err_Out_Of_Memory;
else
memset( (char*)block, 0, (size_t)size );
}
*perror = error;
return block;
}
FTGLUE_APIDEF( FT_Pointer )
ftglue_realloc( FT_Memory memory,
FT_Pointer block,
FT_ULong old_size,
FT_ULong new_size,
FT_Error *perror )
{
FT_Pointer block2 = NULL;
FT_Error error = 0;
if ( old_size == 0 || block == NULL )
{
block2 = ftglue_alloc( memory, new_size, &error );
}
else if ( new_size == 0 )
{
ftglue_free( memory, block );
}
else
{
block2 = memory->realloc( memory, old_size, new_size, block );
if ( block2 == NULL )
error = FT_Err_Out_Of_Memory;
else if ( new_size > old_size )
memset( (char*)block2 + old_size, 0, (size_t)(new_size - old_size) );
}
if ( !error )
block = block2;
*perror = error;
return block;
}
FTGLUE_APIDEF( void )
ftglue_free( FT_Memory memory,
FT_Pointer block )
{
if ( block )
memory->free( memory, block );
}
FTGLUE_APIDEF( FT_Long )
ftglue_stream_pos( FT_Stream stream )
{
LOG(( "ftglue:stream:pos() -> %ld\n", stream->pos ));
return stream->pos;
}
FTGLUE_APIDEF( FT_Error )
ftglue_stream_seek( FT_Stream stream,
FT_Long pos )
{
FT_Error error = 0;
stream->pos = pos;
if ( stream->read )
{
if ( stream->read( stream, pos, 0, 0 ) )
error = FT_Err_Invalid_Stream_Operation;
}
else if ( pos > stream->size )
error = FT_Err_Invalid_Stream_Operation;
LOG(( "ftglue:stream:seek(%ld) -> %d\n", pos, error ));
return error;
}
FTGLUE_APIDEF( FT_Error )
ftglue_stream_frame_enter( FT_Stream stream,
FT_ULong count )
{
FT_Error error = FT_Err_Ok;
FT_ULong read_bytes;
if ( stream->read )
{
/* allocate the frame in memory */
FT_Memory memory = stream->memory;
if ( QALLOC( stream->base, count ) )
goto Exit;
/* read it */
read_bytes = stream->read( stream, stream->pos,
stream->base, count );
if ( read_bytes < count )
{
FREE( stream->base );
error = FT_Err_Invalid_Stream_Operation;
}
stream->cursor = stream->base;
stream->limit = stream->cursor + count;
stream->pos += read_bytes;
}
else
{
/* check current and new position */
if ( stream->pos >= stream->size ||
stream->pos + count > stream->size )
{
error = FT_Err_Invalid_Stream_Operation;
goto Exit;
}
/* set cursor */
stream->cursor = stream->base + stream->pos;
stream->limit = stream->cursor + count;
stream->pos += count;
}
Exit:
LOG(( "ftglue:stream:frame_enter(%ld) -> %d\n", count, error ));
return error;
}
FTGLUE_APIDEF( void )
ftglue_stream_frame_exit( FT_Stream stream )
{
if ( stream->read )
{
FT_Memory memory = stream->memory;
FREE( stream->base );
}
stream->cursor = 0;
stream->limit = 0;
LOG(( "ftglue:stream:frame_exit()\n" ));
}
FTGLUE_APIDEF( FT_Byte )
ftglue_stream_get_byte( FT_Stream stream )
{
FT_Byte result = 0;
if ( stream->cursor < stream->limit )
result = *stream->cursor++;
return result;
}
FTGLUE_APIDEF( FT_Short )
ftglue_stream_get_short( FT_Stream stream )
{
FT_Byte* p;
FT_Short result = 0;
p = stream->cursor;
if ( p + 2 <= stream->limit )
{
result = (FT_Short)((p[0] << 8) | p[1]);
stream->cursor = p+2;
}
return result;
}
FTGLUE_APIDEF( FT_Long )
ftglue_stream_get_long( FT_Stream stream )
{
FT_Byte* p;
FT_Long result = 0;
p = stream->cursor;
if ( p + 4 <= stream->limit )
{
result = (FT_Long)(((FT_Long)p[0] << 24) |
((FT_Long)p[1] << 16) |
((FT_Long)p[2] << 8) |
p[3] );
stream->cursor = p+4;
}
return result;
}
FTGLUE_APIDEF( FT_Error )
ftglue_face_goto_table( FT_Face face,
FT_ULong the_tag,
FT_Stream stream )
{
FT_Error error;
LOG(( "ftglue_face_goto_table( %p, %c%c%c%c, %p )\n",
face,
(int)((the_tag >> 24) & 0xFF),
(int)((the_tag >> 16) & 0xFF),
(int)((the_tag >> 8) & 0xFF),
(int)(the_tag & 0xFF),
stream ));
if ( !FT_IS_SFNT(face) )
{
LOG(( "not a SFNT face !!\n" ));
error = FT_Err_Invalid_Face_Handle;
}
else
{
/* parse the directory table directly, without using
* FreeType's built-in data structures
*/
FT_ULong offset = 0;
FT_UInt count, nn;
if ( face->num_faces > 1 )
{
/* deal with TrueType collections */
FT_ULong offset;
LOG(( ">> This is a TrueType Collection\n" ));
if ( FILE_Seek( 12 + face->face_index*4 ) ||
ACCESS_Frame( 4 ) )
goto Exit;
offset = GET_ULong();
FORGET_Frame();
}
LOG(( "TrueType offset = %ld\n", offset ));
if ( FILE_Seek( offset+4 ) ||
ACCESS_Frame( 2 ) )
goto Exit;
count = GET_UShort();
FORGET_Frame();
if ( FILE_Seek( offset+12 ) ||
ACCESS_Frame( count*16 ) )
goto Exit;
for ( nn = 0; nn < count; nn++ )
{
FT_ULong tag = GET_ULong();
FT_ULong checksum = GET_ULong();
FT_ULong start = GET_ULong();
FT_ULong size = GET_ULong();
FT_UNUSED(checksum);
FT_UNUSED(size);
if ( tag == the_tag )
{
LOG(( "TrueType table (start: %ld) (size: %ld)\n", start, size ));
error = ftglue_stream_seek( stream, offset+start );
goto FoundIt;
}
}
error = TT_Err_Table_Missing;
FoundIt:
FORGET_Frame();
}
Exit:
LOG(( "TrueType error=%d\n", error ));
return error;
}
#undef QALLOC

159
src/ftglue.h Normal file
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/* 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()
#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_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) \
do { \
if ( (_ptr) ) \
{ \
ftglue_free( memory, _ptr ); \
_ptr = NULL; \
} \
} while (0)
#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__ */