ref: 2a41ab9e881b808f1ae0698df50bf7bcd77ad03b
dir: /src/truetype/ttpload.c/
/***************************************************************************/
/* */
/* ttpload.c */
/* */
/* TrueType glyph data/program tables loader (body). */
/* */
/* Copyright 1996-2001, 2002, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_STREAM_H
#include FT_TRUETYPE_TAGS_H
#include "ttpload.h"
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include "ttgxvar.h"
#endif
#include "tterrors.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttpload
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_loca */
/* */
/* <Description> */
/* Loads the locations table. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
#ifdef FT_OPTIMIZE_MEMORY
FT_LOCAL_DEF( FT_Error )
tt_face_load_loca( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_ULong table_len;
/* we need the size of the `glyf' table for malformed `loca' tables */
error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len );
if ( error )
goto Exit;
FT_TRACE2(( "Locations " ));
error = face->goto_table( face, TTAG_loca, stream, &table_len );
if ( error )
{
error = TT_Err_Locations_Missing;
goto Exit;
}
if ( face->header.Index_To_Loc_Format != 0 )
{
if ( table_len >= 0x40000 )
{
FT_TRACE2(( "table too large!\n" ));
error = TT_Err_Invalid_Table;
goto Exit;
}
face->num_locations = (FT_UInt)( table_len >> 2 );
}
else
{
if ( table_len >= 0x20000 )
{
FT_TRACE2(( "table too large!\n" ));
error = TT_Err_Invalid_Table;
goto Exit;
}
face->num_locations = (FT_UInt)( table_len >> 1 );
}
/*
* Extract the frame. We don't need to decompress it since
* we are able to parse it directly.
*/
if ( FT_FRAME_EXTRACT( table_len, face->glyph_locations ) )
goto Exit;
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
FT_LOCAL_DEF( FT_ULong )
tt_face_get_location( TT_Face face,
FT_UInt gindex,
FT_UInt *asize )
{
FT_ULong pos1, pos2;
FT_Byte* p;
FT_Byte* p_limit;
pos1 = pos2 = 0;
if ( gindex < face->num_locations )
{
if ( face->header.Index_To_Loc_Format != 0 )
{
p = face->glyph_locations + gindex * 4;
p_limit = face->glyph_locations + face->num_locations * 4;
pos1 = FT_NEXT_ULONG( p );
pos2 = pos1;
if ( p + 4 <= p_limit )
pos2 = FT_NEXT_ULONG( p );
}
else
{
p = face->glyph_locations + gindex * 2;
p_limit = face->glyph_locations + face->num_locations * 2;
pos1 = FT_NEXT_USHORT( p );
pos2 = pos1;
if ( p + 2 <= p_limit )
pos2 = FT_NEXT_USHORT( p );
pos1 <<= 1;
pos2 <<= 1;
}
}
/* It isn't mentioned explicitly that the `loca' table must be */
/* ordered, but implicitly it refers to the length of an entry */
/* as the difference between the current and the next position. */
/* Anyway, there do exist (malformed) fonts which don't obey */
/* this rule, so we are only able to provide an upper bound for */
/* the size. */
if ( pos2 >= pos1 )
*asize = (FT_UInt)( pos2 - pos1 );
else
*asize = (FT_UInt)( face->glyf_len - pos1 );
return pos1;
}
FT_LOCAL_DEF( void )
tt_face_done_loca( TT_Face face )
{
FT_Stream stream = face->root.stream;
FT_FRAME_RELEASE( face->glyph_locations );
face->num_locations = 0;
}
#else /* !FT_OPTIMIZE_MEMORY */
FT_LOCAL_DEF( FT_Error )
tt_face_load_loca( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_Short LongOffsets;
FT_ULong table_len;
/* we need the size of the `glyf' table for malformed `loca' tables */
error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len );
if ( error )
goto Exit;
FT_TRACE2(( "Locations " ));
LongOffsets = face->header.Index_To_Loc_Format;
error = face->goto_table( face, TTAG_loca, stream, &table_len );
if ( error )
{
error = TT_Err_Locations_Missing;
goto Exit;
}
if ( LongOffsets != 0 )
{
face->num_locations = (FT_UShort)( table_len >> 2 );
FT_TRACE2(( "(32bit offsets): %12d ", face->num_locations ));
if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
goto Exit;
if ( FT_FRAME_ENTER( face->num_locations * 4L ) )
goto Exit;
{
FT_Long* loc = face->glyph_locations;
FT_Long* limit = loc + face->num_locations;
for ( ; loc < limit; loc++ )
*loc = FT_GET_LONG();
}
FT_FRAME_EXIT();
}
else
{
face->num_locations = (FT_UShort)( table_len >> 1 );
FT_TRACE2(( "(16bit offsets): %12d ", face->num_locations ));
if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
goto Exit;
if ( FT_FRAME_ENTER( face->num_locations * 2L ) )
goto Exit;
{
FT_Long* loc = face->glyph_locations;
FT_Long* limit = loc + face->num_locations;
for ( ; loc < limit; loc++ )
*loc = (FT_Long)( (FT_ULong)FT_GET_USHORT() * 2 );
}
FT_FRAME_EXIT();
}
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
FT_LOCAL_DEF( FT_ULong )
tt_face_get_location( TT_Face face,
FT_UInt gindex,
FT_UInt *asize )
{
FT_ULong offset;
FT_UInt count;
offset = face->glyph_locations[gindex];
count = 0;
if ( gindex < (FT_UInt)face->num_locations - 1 )
{
FT_ULong offset1 = face->glyph_locations[gindex + 1];
/* It isn't mentioned explicitly that the `loca' table must be */
/* ordered, but implicitly it refers to the length of an entry */
/* as the difference between the current and the next position. */
/* Anyway, there do exist (malformed) fonts which don't obey */
/* this rule, so we are only able to provide an upper bound for */
/* the size. */
if ( offset1 >= offset )
count = (FT_UInt)( offset1 - offset );
else
count = (FT_UInt)( face->glyf_len - offset );
}
*asize = count;
return offset;
}
FT_LOCAL_DEF( void )
tt_face_done_loca( TT_Face face )
{
FT_Memory memory = face->root.memory;
FT_FREE( face->glyph_locations );
face->num_locations = 0;
}
#endif /* !FT_OPTIMIZE_MEMORY */
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_cvt */
/* */
/* <Description> */
/* Loads the control value table into a face object. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_cvt( TT_Face face,
FT_Stream stream )
{
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_len;
FT_TRACE2(( "CVT " ));
error = face->goto_table( face, TTAG_cvt, stream, &table_len );
if ( error )
{
FT_TRACE2(( "is missing!\n" ));
face->cvt_size = 0;
face->cvt = NULL;
error = TT_Err_Ok;
goto Exit;
}
face->cvt_size = table_len / 2;
if ( FT_NEW_ARRAY( face->cvt, face->cvt_size ) )
goto Exit;
if ( FT_FRAME_ENTER( face->cvt_size * 2L ) )
goto Exit;
{
FT_Short* cur = face->cvt;
FT_Short* limit = cur + face->cvt_size;
for ( ; cur < limit; cur++ )
*cur = FT_GET_SHORT();
}
FT_FRAME_EXIT();
FT_TRACE2(( "loaded\n" ));
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( face->doblend )
error = tt_face_vary_cvt( face, stream );
#endif
Exit:
return error;
#else /* !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
FT_UNUSED( face );
FT_UNUSED( stream );
return TT_Err_Ok;
#endif
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_fpgm */
/* */
/* <Description> */
/* Loads the font program and the cvt program. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_fpgm( TT_Face face,
FT_Stream stream )
{
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
FT_Error error;
FT_ULong table_len;
FT_TRACE2(( "Font program " ));
/* The font program is optional */
error = face->goto_table( face, TTAG_fpgm, stream, &table_len );
if ( error )
{
face->font_program = NULL;
face->font_program_size = 0;
FT_TRACE2(( "is missing!\n" ));
}
else
{
face->font_program_size = table_len;
if ( FT_FRAME_EXTRACT( table_len, face->font_program ) )
goto Exit;
FT_TRACE2(( "loaded, %12d bytes\n", face->font_program_size ));
}
FT_TRACE2(( "Prep program " ));
error = face->goto_table( face, TTAG_prep, stream, &table_len );
if ( error )
{
face->cvt_program = NULL;
face->cvt_program_size = 0;
error = TT_Err_Ok;
FT_TRACE2(( "is missing!\n" ));
}
else
{
face->cvt_program_size = table_len;
if ( FT_FRAME_EXTRACT( table_len, face->cvt_program ) )
goto Exit;
FT_TRACE2(( "loaded, %12d bytes\n", face->cvt_program_size ));
}
Exit:
return error;
#else /* !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
FT_UNUSED( face );
FT_UNUSED( stream );
return TT_Err_Ok;
#endif
}
/* END */