according to decreasing maximum cumulative allocations. * include/freetype/internal/tttypes.h, src/sfnt/ttsbit.c, src/sfnt/ttsbit0.c, src/truetype/ttobjs.c, src/cff/cffobjs.c, src/sfnt/sfobjs.c: implementing new heap-optimized embedded bitmap loader. This one also fixes bug #12107 * src/sfnt/sfobjs.c: fixed bug that prevented loading SFNT fonts without a 'kern' table.CACHE
David Turner
20 years ago
parent
2fdb498317
commit
0037369ccb
10 changed files with 1115 additions and 110 deletions
@ -0,0 +1,943 @@ |
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/***************************************************************************/ |
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/* */ |
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/* ttsbit.c */ |
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/* */ |
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/* TrueType and OpenType embedded bitmap support (body). */ |
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/* */ |
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/* Copyright 1996-2001, 2002, 2003, 2004 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
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/* modified, and distributed under the terms of the FreeType project */ |
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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/* this file you indicate that you have read the license and */ |
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/* understand and accept it fully. */ |
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/* */ |
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/***************************************************************************/ |
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|
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|
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#include <ft2build.h> |
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#include FT_INTERNAL_DEBUG_H |
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#include FT_INTERNAL_STREAM_H |
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#include FT_TRUETYPE_TAGS_H |
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#include "ttsbit.h" |
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#include "sferrors.h" |
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|
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/*************************************************************************/ |
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/* */ |
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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/* messages during execution. */ |
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/* */ |
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#undef FT_COMPONENT |
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#define FT_COMPONENT trace_ttsbit |
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static const FT_Frame_Field tt_sbit_line_metrics_fields[] = |
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{ |
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#undef FT_STRUCTURE |
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#define FT_STRUCTURE TT_SBit_LineMetricsRec |
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|
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/* no FT_FRAME_START */ |
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FT_FRAME_CHAR( ascender ), |
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FT_FRAME_CHAR( descender ), |
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FT_FRAME_BYTE( max_width ), |
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|
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FT_FRAME_CHAR( caret_slope_numerator ), |
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FT_FRAME_CHAR( caret_slope_denominator ), |
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FT_FRAME_CHAR( caret_offset ), |
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|
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FT_FRAME_CHAR( min_origin_SB ), |
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FT_FRAME_CHAR( min_advance_SB ), |
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FT_FRAME_CHAR( max_before_BL ), |
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FT_FRAME_CHAR( min_after_BL ), |
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FT_FRAME_CHAR( pads[0] ), |
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FT_FRAME_CHAR( pads[1] ), |
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FT_FRAME_END |
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}; |
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|
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static const FT_Frame_Field tt_strike_start_fields[] = |
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{ |
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#undef FT_STRUCTURE |
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#define FT_STRUCTURE TT_SBit_StrikeRec |
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|
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/* no FT_FRAME_START */ |
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FT_FRAME_ULONG( ranges_offset ), |
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FT_FRAME_SKIP_LONG, |
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FT_FRAME_ULONG( num_ranges ), |
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FT_FRAME_ULONG( color_ref ), |
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FT_FRAME_END |
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}; |
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|
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static const FT_Frame_Field tt_strike_end_fields[] = |
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{ |
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/* no FT_FRAME_START */ |
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FT_FRAME_USHORT( start_glyph ), |
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FT_FRAME_USHORT( end_glyph ), |
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FT_FRAME_BYTE ( x_ppem ), |
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FT_FRAME_BYTE ( y_ppem ), |
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FT_FRAME_BYTE ( bit_depth ), |
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FT_FRAME_CHAR ( flags ), |
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FT_FRAME_END |
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}; |
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FT_LOCAL_DEF( FT_Error ) |
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tt_face_load_sbit_strikes( TT_Face face, |
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FT_Stream stream ) |
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{ |
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FT_Error error = 0; |
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FT_Memory memory = stream->memory; |
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FT_Fixed version; |
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FT_ULong num_strikes, table_size; |
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FT_ULong table_base; |
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FT_Byte* p; |
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FT_Byte* p_limit; |
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FT_UInt nn, count; |
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face->sbit_num_strikes = 0; |
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/* this table is optional */ |
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error = face->goto_table( face, TTAG_EBLC, stream, &table_size ); |
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if ( error ) |
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error = face->goto_table( face, TTAG_bloc, stream, &table_size ); |
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if ( error ) |
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goto Exit; |
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if ( table_size < 8 ) |
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{ |
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FT_ERROR(( "%s: table too short !\n", "tt_face_load_sbit_strikes" )); |
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error = SFNT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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if ( FT_FRAME_EXTRACT( table_size, face->sbit_table ) ) |
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goto Exit; |
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face->sbit_table_size = table_size; |
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p = face->sbit_table; |
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p_limit = p + table_size; |
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version = FT_NEXT_ULONG(p); |
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num_strikes = FT_NEXT_ULONG(p); |
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if ( version != 0x00020000 || num_strikes >= 0x10000UL ) |
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{ |
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FT_ERROR(( "%s: invalid table version !\n", "tt_face_load_sbit_strikes" )); |
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error = SFNT_Err_Invalid_File_Format; |
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goto Fail; |
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} |
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/* count the number of strikes available in the table. we're a bit
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* paranoid there and don't trust the data. |
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*/ |
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count = (FT_UInt)num_strikes; |
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if ( 8+48UL*count > table_size ) |
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count = (FT_UInt)( (p_limit - p)/48 ); |
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face->sbit_num_strikes = count; |
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/* now allocate the root array of F_Bitmap_Size records,
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* populate them, and that's all there is to it. Unfortunately, |
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* it's not possible to indicate bit depths in the FT_Bitmap_Size |
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* record. What were we thinking ? |
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*/ |
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{ |
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FT_Memory memory = face->root.stream->memory; |
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FT_UInt em_size = (FT_UInt) face->header.Units_Per_EM; |
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FT_Short height = (FT_Short)( face->horizontal.Ascender - |
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face->horizontal.Descender + |
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face->horizontal.Line_Gap ); |
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FT_Short avgwidth = face->os2.xAvgCharWidth; |
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if ( FT_NEW_ARRAY( face->root.available_sizes, count ) ) |
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goto Fail; |
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for ( nn = 0; nn < count; nn++ ) |
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{ |
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FT_Bitmap_Size* bsize = face->root.available_sizes + nn; |
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FT_UInt x_ppem, y_ppem; |
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x_ppem = p[44]; |
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y_ppem = p[45]; |
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bsize->x_ppem = (FT_Pos)(x_ppem << 6); |
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bsize->y_ppem = (FT_Pos)(y_ppem << 6); |
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bsize->height = (FT_Short)( height*y_ppem + em_size/2 ) / em_size; |
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bsize->width = (FT_Short)( avgwidth*y_ppem + em_size/2 ) / em_size; |
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bsize->size = bsize->y_ppem; |
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p += 48; |
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} |
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face->root.face_flags |= FT_FACE_FLAG_FIXED_SIZES; |
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face->root.num_fixed_sizes = count; |
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} |
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Exit: |
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return error; |
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Fail: |
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FT_FRAME_RELEASE( face->sbit_table ); |
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face->sbit_table_size = 0; |
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goto Exit; |
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} |
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FT_LOCAL_DEF( void ) |
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tt_face_free_sbit_strikes( TT_Face face ) |
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{ |
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FT_Stream stream = face->root.stream; |
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FT_FRAME_RELEASE( face->sbit_table ); |
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face->sbit_table_size = 0; |
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face->sbit_num_strikes = 0; |
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} |
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FT_LOCAL_DEF( FT_Error ) |
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tt_face_set_sbit_strike( TT_Face face, |
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FT_UInt x_ppem, |
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FT_UInt y_ppem, |
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FT_ULong *astrike_index ) |
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{ |
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FT_UInt nn, count; |
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FT_Byte* p; |
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FT_Byte* p_limit; |
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if ( x_ppem > 255 || |
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y_ppem < 1 || y_ppem > 255 ) |
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return SFNT_Err_Invalid_PPem; |
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p = face->sbit_table + 8; |
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p_limit = p + face->sbit_table_size; |
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count = face->sbit_num_strikes; |
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for ( nn = 0; nn < count; nn++ ) |
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{ |
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if ( x_ppem == (FT_UInt)p[44] && y_ppem == (FT_UInt)p[45] ) |
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{ |
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*astrike_index = (FT_ULong)nn; |
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return SFNT_Err_Ok; |
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} |
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p += 48; |
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} |
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return SFNT_Err_Invalid_PPem; |
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} |
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typedef struct |
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{ |
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TT_Face face; |
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FT_Stream stream; |
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FT_Bitmap* bitmap; |
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TT_SBit_Metrics metrics; |
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FT_Bool metrics_loaded; |
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FT_Bool bitmap_allocated; |
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FT_Byte bit_depth; |
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FT_ULong ebdt_start; |
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FT_ULong ebdt_size; |
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FT_ULong strike_index_array; |
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FT_ULong strike_index_count; |
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FT_Byte* eblc_base; |
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FT_Byte* eblc_limit; |
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} TT_SBitDecoderRec, *TT_SBitDecoder; |
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static FT_Error |
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tt_sbit_decoder_init( TT_SBitDecoder decoder, |
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TT_Face face, |
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FT_ULong strike_index, |
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TT_SBit_MetricsRec* metrics ) |
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{ |
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FT_Error error; |
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FT_Stream stream = face->root.stream; |
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FT_ULong ebdt_size; |
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error = face->goto_table( face, TTAG_EBDT, stream, &ebdt_size ); |
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if ( error ) |
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error = face->goto_table( face, TTAG_bdat, stream, &ebdt_size ); |
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if (error) |
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goto Exit; |
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decoder->face = face; |
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decoder->stream = stream; |
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decoder->bitmap = &face->root.glyph->bitmap; |
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decoder->metrics = metrics; |
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decoder->metrics_loaded = 0; |
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decoder->bitmap_allocated = 0; |
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decoder->ebdt_start = FT_STREAM_POS(); |
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decoder->ebdt_size = ebdt_size; |
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decoder->eblc_base = face->sbit_table; |
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decoder->eblc_limit = face->sbit_table + face->sbit_table_size; |
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/* now find the strike corresponding to the index
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*/ |
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{ |
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FT_Byte* p = decoder->eblc_base + 8 + 48*strike_index; |
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decoder->strike_index_array = FT_NEXT_ULONG(p); |
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p += 4; |
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decoder->strike_index_count = FT_NEXT_ULONG(p); |
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p += 34; |
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decoder->bit_depth = *p; |
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} |
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Exit: |
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return error; |
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} |
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static void |
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tt_sbit_decoder_done( TT_SBitDecoder decoder ) |
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{ |
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FT_UNUSED(decoder); |
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} |
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static FT_Error |
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tt_sbit_decoder_alloc_bitmap( TT_SBitDecoder decoder ) |
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{ |
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FT_Error error = 0; |
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FT_UInt width, height; |
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FT_Bitmap* map = decoder->bitmap; |
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FT_Long size; |
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if ( !decoder->metrics_loaded ) |
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{ |
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error = FT_Err_Invalid_Argument; |
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goto Exit; |
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} |
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width = decoder->metrics->width; |
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height = decoder->metrics->height; |
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map->width = (int) width; |
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map->rows = (int) height; |
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switch ( decoder->bit_depth ) |
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{ |
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case 1: |
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map->pixel_mode = FT_PIXEL_MODE_MONO; |
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map->pitch = ( map->width + 7 ) >> 3; |
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break; |
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case 2: |
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map->pixel_mode = FT_PIXEL_MODE_GRAY2; |
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map->pitch = ( map->width + 3 ) >> 2; |
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break; |
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case 4: |
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map->pixel_mode = FT_PIXEL_MODE_GRAY4; |
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map->pitch = ( map->width + 1 ) >> 1; |
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break; |
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case 8: |
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map->pixel_mode = FT_PIXEL_MODE_GRAY; |
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map->pitch = map->width; |
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break; |
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default: |
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error = SFNT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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size = map->rows * map->pitch; |
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/* check that there is no empty image */ |
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if ( size == 0 ) |
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goto Exit; /* exit successfully! */ |
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error = ft_glyphslot_alloc_bitmap( decoder->face->root.glyph, size ); |
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if (error) |
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goto Exit; |
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decoder->bitmap_allocated = 1; |
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Exit: |
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return error; |
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} |
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static FT_Error |
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tt_sbit_decoder_load_metrics( TT_SBitDecoder decoder, |
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FT_Byte* *pp, |
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FT_Byte* limit, |
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FT_Bool big ) |
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{ |
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FT_Byte* p = *pp; |
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TT_SBit_Metrics metrics = decoder->metrics; |
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if ( p+5 > limit ) |
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goto Fail; |
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if ( !decoder->metrics_loaded ) |
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{ |
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metrics->height = p[0]; |
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metrics->width = p[1]; |
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metrics->horiBearingX = (FT_Char) p[2]; |
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metrics->horiBearingY = (FT_Char) p[3]; |
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metrics->horiAdvance = p[4]; |
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} |
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p += 5; |
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if ( big ) |
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{ |
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if ( p+3 > limit ) |
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goto Fail; |
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if ( !decoder->metrics_loaded ) |
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{ |
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metrics->vertBearingX = (FT_Char) p[0]; |
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metrics->vertBearingY = (FT_Char) p[1]; |
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metrics->vertAdvance = p[2]; |
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} |
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p += 3; |
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} |
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|
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decoder->metrics_loaded = 1; |
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*pp = p; |
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return 0; |
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Fail: |
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return FT_Err_Invalid_Argument; |
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} |
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|
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|
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|
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/* forward declaration */ |
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static FT_Error |
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tt_sbit_decoder_load_image( TT_SBitDecoder decoder, |
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FT_UInt glyph_index, |
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FT_Int x_pos, |
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FT_Int y_pos ); |
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typedef FT_Error (*TT_SBitDecoder_LoadFunc)( TT_SBitDecoder decoder, |
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FT_Byte* p, |
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FT_Byte* plimit, |
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FT_Int x_pos, |
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FT_Int y_pos ); |
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|
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|
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|
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static FT_Error |
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tt_sbit_decoder_load_byte_aligned( TT_SBitDecoder decoder, |
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FT_Byte* p, |
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FT_Byte* limit, |
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FT_Int x_pos, |
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FT_Int y_pos ) |
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{ |
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FT_Error error = 0; |
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FT_Byte* line; |
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FT_Int bit_height, bit_width, pitch, width, height, h; |
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FT_Bitmap* bitmap; |
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FT_UInt rval; |
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|
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if ( !decoder->bitmap_allocated ) |
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{ |
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error = tt_sbit_decoder_alloc_bitmap( decoder ); |
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if (error) |
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goto Exit; |
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} |
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|
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/* check that we can write the glyph into the bitmap
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*/ |
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bitmap = decoder->bitmap; |
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bit_width = bitmap->width; |
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bit_height = bitmap->rows; |
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pitch = bitmap->pitch; |
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|
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width = decoder->metrics->width; |
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height = decoder->metrics->height; |
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|
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if ( x_pos < 0 || x_pos+width > bit_width || |
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y_pos < 0 || y_pos+height > bit_height ) |
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{ |
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error = FT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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|
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if ( p+((width+7)>>3)*height > limit ) |
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{ |
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error = FT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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|
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/* now do the blit
|
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*/ |
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line += y_pos*pitch + (x_pos >> 3); |
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x_pos &= 7; |
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|
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if ( x_pos == 0 ) /* the easy one */ |
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{ |
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for ( h = height; h > 0; h--, line += pitch ) |
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{ |
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FT_Byte* write = line; |
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FT_Int w; |
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|
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for ( w = width; w >= 8; w -= 8 ) |
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{ |
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write[0] = (FT_Byte)(write[0] | *p++); |
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write += 1; |
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} |
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|
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if ( w > 0 ) |
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write[0] = (FT_Byte)(write[0] | (*p++ & (0xFF00 >> w))); |
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} |
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} |
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else /* x_pos > 0 */ |
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{ |
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for ( h = height; h > 0; h--, line += pitch ) |
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{ |
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FT_Byte* write = line; |
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FT_Int w; |
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FT_UInt wval = 0; |
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|
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for ( w = width; w >= 8; w -= 8 ) |
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{ |
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wval = (FT_UInt)(wval | *p++); |
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write[0] = (FT_Byte)(write[0] | (wval >> x_pos)); |
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write += 1; |
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wval <<= 8; |
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} |
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|
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if ( w > 0 ) |
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wval = (FT_UInt)(wval | (*p++ & (0xFF00 >> w))); |
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|
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write[0] = (FT_Byte)(write[0] | (wval >> x_pos)); |
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} |
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} |
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|
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Exit: |
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return error; |
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} |
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|
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|
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static FT_Error |
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tt_sbit_decoder_load_bit_aligned ( TT_SBitDecoder decoder, |
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FT_Byte* p, |
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FT_Byte* limit, |
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FT_Int x_pos, |
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FT_Int y_pos ) |
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{ |
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FT_Error error = 0; |
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FT_Byte* line; |
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FT_Int bit_height, bit_width, pitch, width, height, h; |
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FT_Bitmap* bitmap; |
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FT_UInt32 rval; |
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|
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if ( !decoder->bitmap_allocated ) |
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{ |
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error = tt_sbit_decoder_alloc_bitmap( decoder ); |
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if (error) |
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goto Exit; |
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} |
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|
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/* check that we can write the glyph into the bitmap
|
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*/ |
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bitmap = decoder->bitmap; |
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bit_width = bitmap->width; |
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bit_height = bitmap->rows; |
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pitch = bitmap->pitch; |
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|
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width = decoder->metrics->width; |
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height = decoder->metrics->height; |
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|
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if ( x_pos < 0 || x_pos+width > bit_width || |
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y_pos < 0 || y_pos+height > bit_height ) |
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{ |
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error = FT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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|
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if ( p+((width+7)>>3)*height > limit ) |
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{ |
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error = FT_Err_Invalid_File_Format; |
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goto Exit; |
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} |
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|
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/* now do the blit
|
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*/ |
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line += y_pos*pitch + (x_pos >> 3); |
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x_pos &= 7; |
||||
rval = 0x10000; |
||||
|
||||
for ( h = height; h > 0; h--, line += pitch ) |
||||
{ |
||||
FT_Byte* write = line; |
||||
FT_UInt32 wval = 0x100 << x_pos; |
||||
FT_Int w; |
||||
|
||||
for ( w = width; w >= 8; w -= 8 ) |
||||
{ |
||||
if ( rval & 0x10000 ) |
||||
rval = 0x100 | *p++; |
||||
|
||||
wval |= (rval & 0x80); |
||||
|
||||
wval <<= 1; |
||||
rval <<= 1; |
||||
|
||||
if ( wval & 0x10000 ) |
||||
{ |
||||
write[0] = (FT_Byte)(write[0] | (wval >> 8)); |
||||
write += 1; |
||||
wval = 0x100; |
||||
} |
||||
} |
||||
|
||||
if ( wval != 0x100 ) |
||||
{ |
||||
while ( wval > 0x1FF ) |
||||
wval >>= 1; |
||||
|
||||
write[0] = (FT_Byte)(write[0] | wval); |
||||
} |
||||
} |
||||
|
||||
Exit: |
||||
return error; |
||||
} |
||||
|
||||
|
||||
static FT_Error |
||||
tt_sbit_decoder_load_compound( TT_SBitDecoder decoder, |
||||
FT_Byte* p, |
||||
FT_Byte* limit, |
||||
FT_Int x_pos, |
||||
FT_Int y_pos ) |
||||
{ |
||||
FT_Error error; |
||||
FT_UInt num_components, nn; |
||||
|
||||
|
||||
if ( p+2 > limit ) |
||||
goto Fail; |
||||
|
||||
num_components = FT_NEXT_USHORT(p); |
||||
if ( p+4*num_components > limit ) |
||||
goto Fail; |
||||
|
||||
for ( nn = 0; nn < num_components; nn++ ) |
||||
{ |
||||
FT_UInt gindex = FT_NEXT_USHORT(p); |
||||
FT_Byte dx = FT_NEXT_BYTE(p); |
||||
FT_Byte dy = FT_NEXT_BYTE(p); |
||||
|
||||
/* NB: a recursive call */ |
||||
error = tt_sbit_decoder_load_image( decoder, gindex, x_pos+dx, y_pos+dy ); |
||||
if ( error ) |
||||
break; |
||||
} |
||||
|
||||
Exit: |
||||
return error; |
||||
|
||||
Fail: |
||||
error = FT_Err_Invalid_File_Format; |
||||
goto Exit; |
||||
} |
||||
|
||||
|
||||
static FT_Error |
||||
tt_sbit_decoder_load_bitmap( TT_SBitDecoder decoder, |
||||
FT_UInt glyph_format, |
||||
FT_ULong glyph_start, |
||||
FT_ULong glyph_size, |
||||
FT_Int x_pos, |
||||
FT_Int y_pos ) |
||||
{ |
||||
FT_Error error; |
||||
FT_Stream stream = decoder->stream; |
||||
FT_Byte* p; |
||||
FT_Byte* p_limit; |
||||
FT_Byte* data; |
||||
|
||||
/* seek into the EBDT table now
|
||||
*/ |
||||
if ( glyph_start + glyph_size > decoder->ebdt_size ) |
||||
{ |
||||
error = FT_Err_Invalid_Argument; |
||||
goto Exit; |
||||
} |
||||
|
||||
if ( FT_STREAM_SEEK( decoder->ebdt_start + glyph_start ) || |
||||
FT_FRAME_EXTRACT( glyph_size, data ) ) |
||||
goto Exit; |
||||
|
||||
p = data; |
||||
p_limit = p + glyph_size; |
||||
|
||||
/* read the data, depending on the glyph format
|
||||
*/ |
||||
switch ( glyph_format ) |
||||
{ |
||||
case 1: case 2: case 8: |
||||
error = tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 0 ); |
||||
break; |
||||
|
||||
case 6: case 7: case 9: |
||||
error = tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 ); |
||||
break; |
||||
|
||||
default: |
||||
error = 0; |
||||
} |
||||
|
||||
if ( error ) |
||||
goto Fail; |
||||
|
||||
{ |
||||
TT_SBitDecoder_LoadFunc loader; |
||||
|
||||
switch ( glyph_format ) |
||||
{ |
||||
case 1: case 6: |
||||
loader = tt_sbit_decoder_load_byte_aligned; |
||||
break; |
||||
|
||||
case 2: case 5: case 7: |
||||
loader = tt_sbit_decoder_load_bit_aligned; |
||||
break; |
||||
|
||||
case 8: |
||||
if ( p+1 > p_limit ) |
||||
goto Fail; |
||||
|
||||
p += 1; /* skip padding */ |
||||
/* fall-through */ |
||||
|
||||
case 9: |
||||
loader = tt_sbit_decoder_load_compound; |
||||
break; |
||||
|
||||
default: |
||||
goto Fail; |
||||
} |
||||
|
||||
error = loader( decoder, p, p_limit, x_pos, y_pos ); |
||||
} |
||||
|
||||
Fail: |
||||
FT_FRAME_RELEASE( data ); |
||||
|
||||
Exit: |
||||
return error; |
||||
} |
||||
|
||||
|
||||
static FT_Error |
||||
tt_sbit_decoder_load_image( TT_SBitDecoder decoder, |
||||
FT_UInt glyph_index, |
||||
FT_Int x_pos, |
||||
FT_Int y_pos ) |
||||
{ |
||||
/* first, we find the correct strike range that applies to this
|
||||
* glyph index. |
||||
*/ |
||||
FT_Byte* p = decoder->eblc_base + decoder->strike_index_array; |
||||
FT_Byte* p_limit = decoder->eblc_limit; |
||||
FT_ULong num_ranges = decoder->strike_index_count; |
||||
FT_UInt start, end, offset, index_format, image_format; |
||||
FT_ULong image_start, image_end, image_offset; |
||||
|
||||
if ( p+8*num_ranges > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
for ( ; num_ranges > 0; num_ranges-- ) |
||||
{ |
||||
start = FT_NEXT_USHORT(p); |
||||
end = FT_NEXT_USHORT(p); |
||||
|
||||
if ( glyph_index >= start && glyph_index <= end ) |
||||
goto FoundRange; |
||||
|
||||
p += 4; /* ignore index offset */ |
||||
} |
||||
goto NoBitmap; |
||||
|
||||
FoundRange: |
||||
p = decoder->eblc_base + decoder->strike_index_array + FT_NEXT_ULONG(p); |
||||
if ( p+8 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
/* now, we're going to find the glyph's location and extend within
|
||||
* the ebdt table |
||||
*/ |
||||
index_format = FT_NEXT_USHORT(p); |
||||
image_format = FT_NEXT_USHORT(p); |
||||
image_offset = FT_NEXT_ULONG(p); |
||||
|
||||
switch ( index_format ) |
||||
{ |
||||
case 1: /* 4-byte offsets relative to 'image_offset' */ |
||||
{ |
||||
p += 4*(glyph_index-start); |
||||
if ( p+8 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
image_start = FT_NEXT_ULONG(p); |
||||
image_end = FT_NEXT_ULONG(p); |
||||
|
||||
if ( image_start == image_end ) /* missing glyph */ |
||||
goto NoBitmap; |
||||
} |
||||
break; |
||||
|
||||
case 2: /* big metrics, constant image size */ |
||||
{ |
||||
FT_ULong image_size; |
||||
|
||||
if ( p+12 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
image_size = FT_NEXT_ULONG(p); |
||||
|
||||
if ( tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 ) ) |
||||
goto NoBitmap; |
||||
|
||||
image_start = image_offset + image_size*(glyph_index-start); |
||||
image_end = image_start + image_size; |
||||
} |
||||
break; |
||||
|
||||
case 3: /* 2-byte offsets relative to 'image_offset' */ |
||||
{ |
||||
p += 2*(glyph_index-start); |
||||
if ( p+4 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
image_start = FT_NEXT_USHORT(p); |
||||
image_end = FT_NEXT_USHORT(p); |
||||
|
||||
if ( image_start == image_end ) /* missing glyph */ |
||||
goto NoBitmap; |
||||
} |
||||
break; |
||||
|
||||
case 4: /* sparse glyph array with (glyph,offset) pairs */ |
||||
{ |
||||
FT_ULong mm, num_glyphs; |
||||
|
||||
if ( p+4 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
num_glyphs = FT_NEXT_ULONG(p); |
||||
if ( p+(num_glyphs+1)*4 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
for ( mm = 0; mm < num_glyphs; mm++ ) |
||||
{ |
||||
FT_UInt gindex = FT_NEXT_USHORT(p); |
||||
|
||||
if ( gindex == glyph_index ) |
||||
{ |
||||
image_start = FT_NEXT_USHORT(p); |
||||
p += 2; |
||||
image_end = FT_PEEK_USHORT(p); |
||||
break; |
||||
} |
||||
p += 2; |
||||
} |
||||
|
||||
if ( mm >= num_glyphs ) |
||||
goto NoBitmap; |
||||
} |
||||
break; |
||||
|
||||
case 5: /* constant metrics with sparse glyph codes */ |
||||
{ |
||||
FT_ULong image_size, mm, num_glyphs; |
||||
|
||||
if ( p+16 > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
image_size = FT_NEXT_ULONG(p); |
||||
|
||||
if ( tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 ) ) |
||||
goto NoBitmap; |
||||
|
||||
num_glyphs = FT_NEXT_ULONG(p); |
||||
if ( p + 2*num_glyphs > p_limit ) |
||||
goto NoBitmap; |
||||
|
||||
for ( mm = 0; mm < num_glyphs; mm++ ) |
||||
{ |
||||
FT_UInt gindex = FT_NEXT_USHORT(p); |
||||
|
||||
if ( gindex == glyph_index ) |
||||
break; |
||||
} |
||||
|
||||
if ( mm >= num_glyphs ) |
||||
goto NoBitmap; |
||||
|
||||
image_start = image_offset + image_size*mm; |
||||
image_end = image_start + image_size; |
||||
} |
||||
break; |
||||
|
||||
default: |
||||
goto NoBitmap; |
||||
} |
||||
|
||||
if ( image_start > image_end ) |
||||
goto NoBitmap; |
||||
|
||||
image_end -= image_start; |
||||
image_start = image_offset + image_start; |
||||
|
||||
|
||||
return tt_sbit_decoder_load_bitmap( decoder, |
||||
image_format, |
||||
image_offset + image_start, |
||||
image_end, |
||||
x_pos, |
||||
y_pos ); |
||||
NoBitmap: |
||||
return FT_Err_Invalid_Argument; |
||||
} |
||||
|
||||
|
||||
|
||||
|
||||
FT_LOCAL( FT_Error ) |
||||
tt_face_load_sbit_image( TT_Face face, |
||||
FT_ULong strike_index, |
||||
FT_UInt glyph_index, |
||||
FT_UInt load_flags, |
||||
FT_Stream stream, |
||||
FT_Bitmap *map, |
||||
TT_SBit_MetricsRec *metrics ) |
||||
{ |
||||
TT_SBitDecoderRec decoder[1]; |
||||
FT_Error error; |
||||
|
||||
error = tt_sbit_decoder_init( decoder, face, strike_index, metrics ); |
||||
if ( !error ) |
||||
{ |
||||
error = tt_sbit_decoder_load_image( decoder, glyph_index, 0, 0 ); |
||||
tt_sbit_decoder_done( decoder ); |
||||
} |
||||
|
||||
return error; |
||||
} |
||||
Loading…
Reference in new issue