+++ /dev/null
-/***************************************************************************/
-/* */
-/* ttcmap.c */
-/* */
-/* TrueType character mapping table (cmap) support (body). */
-/* */
-/* Copyright 1996-2000 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 <freetype/internal/ftdebug.h>
-#include <freetype/internal/tterrors.h>
-
-
-#ifdef FT_FLAT_COMPILE
-
-#include "ttload.h"
-#include "ttcmap.h"
-
-#else
-
-#include <freetype/src/sfnt/ttload.h>
-#include <freetype/src/sfnt/ttcmap.h>
-
-#endif
-
-
- /*************************************************************************/
- /* */
- /* 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_ttcmap
-
-
- static FT_UInt code_to_index0( TT_CMapTable* charmap,
- FT_ULong char_code );
- static FT_UInt code_to_index2( TT_CMapTable* charmap,
- FT_ULong char_code );
- static FT_UInt code_to_index4( TT_CMapTable* charmap,
- FT_ULong char_code );
- static FT_UInt code_to_index6( TT_CMapTable* charmap,
- FT_ULong char_code );
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* TT_CharMap_Load */
- /* */
- /* <Description> */
- /* Loads a given TrueType character map into memory. */
- /* */
- /* <Input> */
- /* face :: A handle to the parent face object. */
- /* stream :: A handle to the current stream object. */
- /* */
- /* <InOut> */
- /* table :: A pointer to a cmap object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <Note> */
- /* The function assumes that the stream is already in use (i.e., */
- /* opened). In case of error, all partially allocated tables are */
- /* released. */
- /* */
- LOCAL_FUNC
- FT_Error TT_CharMap_Load( TT_Face face,
- TT_CMapTable* cmap,
- FT_Stream stream )
- {
- FT_Error error;
- FT_Memory memory;
- FT_UShort num_SH, num_Seg, i;
-
- FT_UShort u, l;
-
- TT_CMap0* cmap0;
- TT_CMap2* cmap2;
- TT_CMap4* cmap4;
- TT_CMap6* cmap6;
-
- TT_CMap2SubHeader* cmap2sub;
- TT_CMap4Segment* segments;
-
-
- if ( cmap->loaded )
- return TT_Err_Ok;
-
- memory = stream->memory;
-
- if ( FILE_Seek( cmap->offset ) )
- return error;
-
- switch ( cmap->format )
- {
- case 0:
- cmap0 = &cmap->c.cmap0;
-
- if ( ALLOC( cmap0->glyphIdArray, 256L ) ||
- FILE_Read( cmap0->glyphIdArray, 256L ) )
- goto Fail;
-
- cmap->get_index = code_to_index0;
- break;
-
- case 2:
- num_SH = 0;
- cmap2 = &cmap->c.cmap2;
-
- /* allocate subheader keys */
-
- if ( ALLOC_ARRAY( cmap2->subHeaderKeys, 256, FT_UShort ) ||
- ACCESS_Frame( 512L ) )
- goto Fail;
-
- for ( i = 0; i < 256; i++ )
- {
- u = GET_UShort() / 8;
- cmap2->subHeaderKeys[i] = u;
-
- if ( num_SH < u )
- num_SH = u;
- }
-
- FORGET_Frame();
-
- /* load subheaders */
-
- cmap2->numGlyphId = l =
- ( ( cmap->length - 2L * ( 256 + 3 ) - num_SH * 8L ) & 0xFFFF ) / 2;
-
- if ( ALLOC_ARRAY( cmap2->subHeaders,
- num_SH + 1,
- TT_CMap2SubHeader ) ||
- ACCESS_Frame( ( num_SH + 1 ) * 8L ) )
- goto Fail;
-
- cmap2sub = cmap2->subHeaders;
-
- for ( i = 0; i <= num_SH; i++ )
- {
- cmap2sub->firstCode = GET_UShort();
- cmap2sub->entryCount = GET_UShort();
- cmap2sub->idDelta = GET_Short();
- /* we apply the location offset immediately */
- cmap2sub->idRangeOffset = GET_UShort() - ( num_SH - i ) * 8 - 2;
-
- cmap2sub++;
- }
-
- FORGET_Frame();
-
- /* load glyph IDs */
-
- if ( ALLOC_ARRAY( cmap2->glyphIdArray, l, FT_UShort ) ||
- ACCESS_Frame( l * 2L ) )
- goto Fail;
-
- for ( i = 0; i < l; i++ )
- cmap2->glyphIdArray[i] = GET_UShort();
-
- FORGET_Frame();
-
- cmap->get_index = code_to_index2;
- break;
-
- case 4:
- cmap4 = &cmap->c.cmap4;
-
- /* load header */
-
- if ( ACCESS_Frame( 8L ) )
- goto Fail;
-
- cmap4->segCountX2 = GET_UShort();
- cmap4->searchRange = GET_UShort();
- cmap4->entrySelector = GET_UShort();
- cmap4->rangeShift = GET_UShort();
-
- num_Seg = cmap4->segCountX2 / 2;
-
- FORGET_Frame();
-
- /* load segments */
-
- if ( ALLOC_ARRAY( cmap4->segments,
- num_Seg,
- TT_CMap4Segment ) ||
- ACCESS_Frame( ( num_Seg * 4 + 1 ) * 2L ) )
- goto Fail;
-
- segments = cmap4->segments;
-
- for ( i = 0; i < num_Seg; i++ )
- segments[i].endCount = GET_UShort();
-
- (void)GET_UShort();
-
- for ( i = 0; i < num_Seg; i++ )
- segments[i].startCount = GET_UShort();
-
- for ( i = 0; i < num_Seg; i++ )
- segments[i].idDelta = GET_Short();
-
- for ( i = 0; i < num_Seg; i++ )
- segments[i].idRangeOffset = GET_UShort();
-
- FORGET_Frame();
-
- cmap4->numGlyphId = l =
- ( ( cmap->length - ( 16L + 8L * num_Seg ) ) & 0xFFFF ) / 2;
-
- /* load IDs */
-
- if ( ALLOC_ARRAY( cmap4->glyphIdArray, l, FT_UShort ) ||
- ACCESS_Frame( l * 2L ) )
- goto Fail;
-
- for ( i = 0; i < l; i++ )
- cmap4->glyphIdArray[i] = GET_UShort();
-
- FORGET_Frame();
-
- cmap->get_index = code_to_index4;
-
- cmap4->last_segment = cmap4->segments;
- break;
-
- case 6:
- cmap6 = &cmap->c.cmap6;
-
- if ( ACCESS_Frame( 4L ) )
- goto Fail;
-
- cmap6->firstCode = GET_UShort();
- cmap6->entryCount = GET_UShort();
-
- FORGET_Frame();
-
- l = cmap6->entryCount;
-
- if ( ALLOC_ARRAY( cmap6->glyphIdArray,
- cmap6->entryCount,
- FT_Short ) ||
- ACCESS_Frame( l * 2L ) )
- goto Fail;
-
- for ( i = 0; i < l; i++ )
- cmap6->glyphIdArray[i] = GET_UShort();
-
- FORGET_Frame();
- cmap->get_index = code_to_index6;
- break;
-
- default: /* corrupt character mapping table */
- return TT_Err_Invalid_CharMap_Format;
-
- }
-
- return TT_Err_Ok;
-
- Fail:
- TT_CharMap_Free( face, cmap );
- return error;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* TT_CharMap_Free */
- /* */
- /* <Description> */
- /* Destroys a character mapping table. */
- /* */
- /* <Input> */
- /* face :: A handle to the parent face object. */
- /* cmap :: A handle to a cmap object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- LOCAL_FUNC
- FT_Error TT_CharMap_Free( TT_Face face,
- TT_CMapTable* cmap )
- {
- FT_Memory memory;
-
-
- if ( !cmap )
- return TT_Err_Ok;
-
- memory = face->root.driver->root.memory;
-
- switch ( cmap->format )
- {
- case 0:
- FREE( cmap->c.cmap0.glyphIdArray );
- break;
-
- case 2:
- FREE( cmap->c.cmap2.subHeaderKeys );
- FREE( cmap->c.cmap2.subHeaders );
- FREE( cmap->c.cmap2.glyphIdArray );
- break;
-
- case 4:
- FREE( cmap->c.cmap4.segments );
- FREE( cmap->c.cmap4.glyphIdArray );
- cmap->c.cmap4.segCountX2 = 0;
- break;
-
- case 6:
- FREE( cmap->c.cmap6.glyphIdArray );
- cmap->c.cmap6.entryCount = 0;
- break;
-
- default:
- /* invalid table format, do nothing */
- ;
- }
-
- cmap->loaded = FALSE;
- return TT_Err_Ok;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* code_to_index0 */
- /* */
- /* <Description> */
- /* Converts the character code into a glyph index. Uses format 0. */
- /* `charCode' must be in the range 0x00-0xFF (otherwise 0 is */
- /* returned). */
- /* */
- /* <Input> */
- /* charCode :: The wanted character code. */
- /* cmap0 :: A pointer to a cmap table in format 0. */
- /* */
- /* <Return> */
- /* Glyph index into the glyphs array. 0 if the glyph does not exist. */
- /* */
- static
- FT_UInt code_to_index0( TT_CMapTable* cmap,
- FT_ULong charCode )
- {
- TT_CMap0* cmap0 = &cmap->c.cmap0;
-
-
- return ( charCode <= 0xFF ? cmap0->glyphIdArray[charCode] : 0 );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* code_to_index2 */
- /* */
- /* <Description> */
- /* Converts the character code into a glyph index. Uses format 2. */
- /* */
- /* <Input> */
- /* charCode :: The wanted character code. */
- /* cmap2 :: A pointer to a cmap table in format 2. */
- /* */
- /* <Return> */
- /* Glyph index into the glyphs array. 0 if the glyph does not exist. */
- /* */
- static
- FT_UInt code_to_index2( TT_CMapTable* cmap,
- FT_ULong charCode )
- {
- FT_UInt result, index1, offset;
- FT_UInt char_lo;
- FT_ULong char_hi;
- TT_CMap2SubHeader* sh2;
- TT_CMap2* cmap2;
-
-
- cmap2 = &cmap->c.cmap2;
- result = 0;
- char_lo = (FT_UInt)( charCode & 0xFF );
- char_hi = charCode >> 8;
-
- if ( char_hi == 0 )
- {
- /* an 8-bit character code -- we use the subHeader 0 in this case */
- /* to test whether the character code is in the charmap */
- if ( cmap2->subHeaderKeys[char_lo] == 0 )
- result = cmap2->glyphIdArray[char_lo];
- }
- else
- {
- /* a 16-bit character code */
- index1 = cmap2->subHeaderKeys[char_hi & 0xFF];
- if ( index1 )
- {
- sh2 = cmap2->subHeaders + index1;
- char_lo -= sh2->firstCode;
-
- if ( char_lo < sh2->entryCount )
- {
- offset = sh2->idRangeOffset / 2 + char_lo;
- if ( offset < cmap2->numGlyphId )
- {
- result = cmap2->glyphIdArray[offset];
- if ( result )
- result = ( result + sh2->idDelta ) & 0xFFFF;
- }
- }
- }
- }
-
- return result;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* code_to_index4 */
- /* */
- /* <Description> */
- /* Converts the character code into a glyph index. Uses format 4. */
- /* */
- /* <Input> */
- /* charCode :: The wanted character code. */
- /* cmap4 :: A pointer to a cmap table in format 4. */
- /* */
- /* <Return> */
- /* Glyph index into the glyphs array. 0 if the glyph does not exist. */
- /* */
- static
- FT_UInt code_to_index4( TT_CMapTable* cmap,
- FT_ULong charCode )
- {
- FT_UInt result, index1, segCount;
- TT_CMap4* cmap4;
- TT_CMap4Segment *seg4, *limit;
-
-
- cmap4 = &cmap->c.cmap4;
- result = 0;
- segCount = cmap4->segCountX2 / 2;
- seg4 = cmap4->segments;
- limit = seg4 + segCount;
-
- /* check against the last segment */
- seg4 = cmap4->last_segment;
-
- /* the following is equivalent to performing two tests, as in */
- /* */
- /* if ( charCode >= seg4->startCount && charCode <= seg4->endCount ) */
- /* */
- /* Yes, that's a bit strange, but it's faster, and the idea behind */
- /* the cache is to significantly speed up charcode to glyph index */
- /* conversion. */
-
- if ( (FT_ULong)(charCode - seg4->startCount) <
- (FT_ULong)(seg4->endCount - seg4->startCount) )
- goto Found;
-
- for ( seg4 = cmap4->segments; seg4 < limit; seg4++ )
- {
- /* the ranges are sorted in increasing order. If we are out of */
- /* the range here, the char code isn't in the charmap, so exit. */
-
- if ( charCode > seg4->endCount )
- continue;
-
- if ( charCode >= seg4->startCount )
- goto Found;
- }
- return 0;
-
- Found:
- cmap4->last_segment = seg4;
-
- /* if the idRangeOffset is 0, we can compute the glyph index */
- /* directly */
-
- if ( seg4->idRangeOffset == 0 )
- result = ( charCode + seg4->idDelta ) & 0xFFFF;
- else
- {
- /* otherwise, we must use the glyphIdArray to do it */
- index1 = seg4->idRangeOffset / 2
- + ( charCode - seg4->startCount )
- + ( seg4 - cmap4->segments )
- - segCount;
-
- if ( index1 < cmap4->numGlyphId &&
- cmap4->glyphIdArray[index1] != 0 )
- result = ( cmap4->glyphIdArray[index1] + seg4->idDelta ) & 0xFFFF;
- }
-
- return result;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* code_to_index6 */
- /* */
- /* <Description> */
- /* Converts the character code into a glyph index. Uses format 6. */
- /* */
- /* <Input> */
- /* charCode :: The wanted character code. */
- /* cmap6 :: A pointer to a cmap table in format 6. */
- /* */
- /* <Return> */
- /* Glyph index into the glyphs array. 0 if the glyph does not exist. */
- /* */
- static
- FT_UInt code_to_index6( TT_CMapTable* cmap,
- FT_ULong charCode )
- {
- TT_CMap6* cmap6;
- FT_UInt result = 0;
-
-
- cmap6 = &cmap->c.cmap6;
- result = 0;
- charCode -= cmap6->firstCode;
-
- if ( charCode < cmap6->entryCount )
- result = cmap6->glyphIdArray[charCode];
-
- return result;
- }
-
-
-/* END */
git://git.jankratochvil.net / reactos.git / blobdiff