bd5ae40006
C++ programs easier: Renamed FT_WordXX to FT_UIntXX. Changed a lot of void* to FT_Byte* if related to i/o streams -- FreeType always accesses streams byte-wise, so this makes sense IMHO. Added a lot of #ifdef __cplusplus to header files (and removed a few). Other minor syntax fixes (mostly casts). Replaced the variable `private' with `private_dict' -- `private' is reserved in C++.
541 lines
19 KiB
C
541 lines
19 KiB
C
/***************************************************************************/
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/* */
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/* ttcmap.c */
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/* */
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/* TrueType character mapping table (cmap) support (body). */
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/* */
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/* Copyright 1996-2000 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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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/tterrors.h>
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#include <ttload.h>
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#include <ttcmap.h>
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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_ttcmap
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static FT_UInt code_to_index0( TT_CMapTable* charmap,
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FT_ULong char_code );
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static FT_UInt code_to_index2( TT_CMapTable* charmap,
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FT_ULong char_code );
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static FT_UInt code_to_index4( TT_CMapTable* charmap,
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FT_ULong char_code );
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static FT_UInt code_to_index6( TT_CMapTable* charmap,
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FT_ULong char_code );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_CharMap_Load */
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/* */
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/* <Description> */
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/* Loads a given TrueType character map into memory. */
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/* */
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/* <Input> */
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/* face :: A handle to the parent face object. */
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/* stream :: A handle to the current stream object. */
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/* */
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/* <InOut> */
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/* table :: A pointer to a cmap object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* The function assumes that the stream is already in use (i.e., */
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/* opened). In case of error, all partially allocated tables are */
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/* released. */
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/* */
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LOCAL_FUNC
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FT_Error TT_CharMap_Load( TT_Face face,
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TT_CMapTable* cmap,
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FT_Stream stream )
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{
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FT_Error error;
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FT_Memory memory;
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FT_UShort num_SH, num_Seg, i;
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FT_UShort u, l;
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TT_CMap0* cmap0;
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TT_CMap2* cmap2;
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TT_CMap4* cmap4;
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TT_CMap6* cmap6;
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TT_CMap2SubHeader* cmap2sub;
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TT_CMap4Segment* segments;
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if ( cmap->loaded )
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return TT_Err_Ok;
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memory = stream->memory;
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if ( FILE_Seek( cmap->offset ) )
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return error;
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switch ( cmap->format )
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{
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case 0:
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cmap0 = &cmap->c.cmap0;
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if ( ALLOC( cmap0->glyphIdArray, 256L ) ||
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FILE_Read( cmap0->glyphIdArray, 256L ) )
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goto Fail;
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cmap->get_index = code_to_index0;
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break;
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case 2:
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num_SH = 0;
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cmap2 = &cmap->c.cmap2;
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/* allocate subheader keys */
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if ( ALLOC_ARRAY( cmap2->subHeaderKeys, 256, FT_UShort ) ||
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ACCESS_Frame( 512L ) )
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goto Fail;
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for ( i = 0; i < 256; i++ )
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{
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u = GET_UShort() / 8;
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cmap2->subHeaderKeys[i] = u;
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if ( num_SH < u )
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num_SH = u;
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}
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FORGET_Frame();
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/* load subheaders */
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cmap2->numGlyphId = l =
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( ( cmap->length - 2L * ( 256 + 3 ) - num_SH * 8L ) & 0xFFFF ) / 2;
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if ( ALLOC_ARRAY( cmap2->subHeaders,
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num_SH + 1,
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TT_CMap2SubHeader ) ||
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ACCESS_Frame( ( num_SH + 1 ) * 8L ) )
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goto Fail;
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cmap2sub = cmap2->subHeaders;
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for ( i = 0; i <= num_SH; i++ )
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{
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cmap2sub->firstCode = GET_UShort();
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cmap2sub->entryCount = GET_UShort();
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cmap2sub->idDelta = GET_Short();
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/* we apply the location offset immediately */
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cmap2sub->idRangeOffset = GET_UShort() - ( num_SH - i ) * 8 - 2;
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cmap2sub++;
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}
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FORGET_Frame();
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/* load glyph IDs */
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if ( ALLOC_ARRAY( cmap2->glyphIdArray, l, FT_UShort ) ||
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ACCESS_Frame( l * 2L ) )
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goto Fail;
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for ( i = 0; i < l; i++ )
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cmap2->glyphIdArray[i] = GET_UShort();
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FORGET_Frame();
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cmap->get_index = code_to_index2;
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break;
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case 4:
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cmap4 = &cmap->c.cmap4;
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/* load header */
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if ( ACCESS_Frame( 8L ) )
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goto Fail;
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cmap4->segCountX2 = GET_UShort();
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cmap4->searchRange = GET_UShort();
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cmap4->entrySelector = GET_UShort();
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cmap4->rangeShift = GET_UShort();
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num_Seg = cmap4->segCountX2 / 2;
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FORGET_Frame();
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/* load segments */
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if ( ALLOC_ARRAY( cmap4->segments,
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num_Seg,
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TT_CMap4Segment ) ||
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ACCESS_Frame( ( num_Seg * 4 + 1 ) * 2L ) )
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goto Fail;
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segments = cmap4->segments;
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for ( i = 0; i < num_Seg; i++ )
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segments[i].endCount = GET_UShort();
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(void)GET_UShort();
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for ( i = 0; i < num_Seg; i++ )
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segments[i].startCount = GET_UShort();
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for ( i = 0; i < num_Seg; i++ )
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segments[i].idDelta = GET_Short();
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for ( i = 0; i < num_Seg; i++ )
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segments[i].idRangeOffset = GET_UShort();
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FORGET_Frame();
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cmap4->numGlyphId = l =
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( ( cmap->length - ( 16L + 8L * num_Seg ) ) & 0xFFFF ) / 2;
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/* load IDs */
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if ( ALLOC_ARRAY( cmap4->glyphIdArray, l, FT_UShort ) ||
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ACCESS_Frame( l * 2L ) )
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goto Fail;
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for ( i = 0; i < l; i++ )
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cmap4->glyphIdArray[i] = GET_UShort();
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FORGET_Frame();
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cmap->get_index = code_to_index4;
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cmap4->last_segment = cmap4->segments;
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break;
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case 6:
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cmap6 = &cmap->c.cmap6;
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if ( ACCESS_Frame( 4L ) )
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goto Fail;
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cmap6->firstCode = GET_UShort();
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cmap6->entryCount = GET_UShort();
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FORGET_Frame();
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l = cmap6->entryCount;
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if ( ALLOC_ARRAY( cmap6->glyphIdArray,
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cmap6->entryCount,
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FT_Short ) ||
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ACCESS_Frame( l * 2L ) )
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goto Fail;
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for ( i = 0; i < l; i++ )
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cmap6->glyphIdArray[i] = GET_UShort();
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FORGET_Frame();
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cmap->get_index = code_to_index6;
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break;
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default: /* corrupt character mapping table */
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return TT_Err_Invalid_CharMap_Format;
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}
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return TT_Err_Ok;
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Fail:
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TT_CharMap_Free( face, cmap );
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_CharMap_Free */
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/* */
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/* <Description> */
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/* Destroys a character mapping table. */
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/* */
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/* <Input> */
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/* face :: A handle to the parent face object. */
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/* cmap :: A handle to a cmap object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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LOCAL_FUNC
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FT_Error TT_CharMap_Free( TT_Face face,
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TT_CMapTable* cmap )
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{
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FT_Memory memory;
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if ( !cmap )
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return TT_Err_Ok;
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memory = face->root.driver->root.memory;
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switch ( cmap->format )
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{
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case 0:
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FREE( cmap->c.cmap0.glyphIdArray );
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break;
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case 2:
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FREE( cmap->c.cmap2.subHeaderKeys );
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FREE( cmap->c.cmap2.subHeaders );
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FREE( cmap->c.cmap2.glyphIdArray );
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break;
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case 4:
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FREE( cmap->c.cmap4.segments );
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FREE( cmap->c.cmap4.glyphIdArray );
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cmap->c.cmap4.segCountX2 = 0;
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break;
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case 6:
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FREE( cmap->c.cmap6.glyphIdArray );
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cmap->c.cmap6.entryCount = 0;
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break;
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default:
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/* invalid table format, do nothing */
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;
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}
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cmap->loaded = FALSE;
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return TT_Err_Ok;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* code_to_index0 */
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/* */
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/* <Description> */
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/* Converts the character code into a glyph index. Uses format 0. */
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/* `charCode' must be in the range 0x00-0xFF (otherwise 0 is */
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/* returned). */
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/* */
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/* <Input> */
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/* charCode :: The wanted character code. */
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/* cmap0 :: A pointer to a cmap table in format 0. */
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/* */
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/* <Return> */
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/* Glyph index into the glyphs array. 0 if the glyph does not exist. */
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/* */
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static
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FT_UInt code_to_index0( TT_CMapTable* cmap,
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FT_ULong charCode )
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{
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TT_CMap0* cmap0 = &cmap->c.cmap0;
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return ( charCode <= 0xFF ? cmap0->glyphIdArray[charCode] : 0 );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* code_to_index2 */
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/* */
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/* <Description> */
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/* Converts the character code into a glyph index. Uses format 2. */
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/* */
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/* <Input> */
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/* charCode :: The wanted character code. */
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/* cmap2 :: A pointer to a cmap table in format 2. */
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/* */
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/* <Return> */
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/* Glyph index into the glyphs array. 0 if the glyph does not exist. */
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/* */
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static
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FT_UInt code_to_index2( TT_CMapTable* cmap,
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FT_ULong charCode )
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{
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FT_UInt result, index1, offset;
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FT_UInt char_lo;
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FT_ULong char_hi;
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TT_CMap2SubHeader* sh2;
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TT_CMap2* cmap2;
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cmap2 = &cmap->c.cmap2;
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result = 0;
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char_lo = (FT_UInt)( charCode & 0xFF );
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char_hi = charCode >> 8;
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if ( char_hi == 0 )
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{
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/* an 8-bit character code -- we use the subHeader 0 in this case */
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/* to test whether the character code is in the charmap */
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if ( cmap2->subHeaderKeys[char_lo] == 0 )
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result = cmap2->glyphIdArray[char_lo];
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}
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else
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{
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/* a 16-bit character code */
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index1 = cmap2->subHeaderKeys[char_hi & 0xFF];
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if ( index1 )
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{
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sh2 = cmap2->subHeaders + index1;
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char_lo -= sh2->firstCode;
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if ( char_lo < sh2->entryCount )
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{
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offset = sh2->idRangeOffset / 2 + char_lo;
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if ( offset < cmap2->numGlyphId )
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{
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result = cmap2->glyphIdArray[offset];
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if ( result )
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result = ( result + sh2->idDelta ) & 0xFFFF;
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}
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}
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}
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}
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return result;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* code_to_index4 */
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/* */
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/* <Description> */
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/* Converts the character code into a glyph index. Uses format 4. */
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/* */
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/* <Input> */
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/* charCode :: The wanted character code. */
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/* cmap4 :: A pointer to a cmap table in format 4. */
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/* */
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/* <Return> */
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/* Glyph index into the glyphs array. 0 if the glyph does not exist. */
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/* */
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static
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FT_UInt code_to_index4( TT_CMapTable* cmap,
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FT_ULong charCode )
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{
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FT_UInt result, index1, segCount;
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TT_CMap4* cmap4;
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TT_CMap4Segment *seg4, *limit;
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cmap4 = &cmap->c.cmap4;
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result = 0;
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segCount = cmap4->segCountX2 / 2;
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seg4 = cmap4->segments;
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limit = seg4 + segCount;
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/* check against the last segment */
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seg4 = cmap4->last_segment;
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/* the following is equivalent to performing two tests, as in */
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/* */
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/* if ( charCode >= seg4->startCount && charCode <= seg4->endCount ) */
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/* */
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/* Yes, that's a bit strange, but it's faster, and the idea behind */
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/* the cache is to significantly speed up charcode to glyph index */
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/* conversion. */
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if ( (FT_ULong)(charCode - seg4->startCount) <
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(FT_ULong)(seg4->endCount - seg4->startCount) )
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goto Found;
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for ( seg4 = cmap4->segments; seg4 < limit; seg4++ )
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{
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/* the ranges are sorted in increasing order. If we are out of */
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/* the range here, the char code isn't in the charmap, so exit. */
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if ( charCode > seg4->endCount )
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continue;
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if ( charCode >= seg4->startCount )
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goto Found;
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}
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return 0;
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Found:
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cmap4->last_segment = seg4;
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/* if the idRangeOffset is 0, we can compute the glyph index */
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/* directly */
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if ( seg4->idRangeOffset == 0 )
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result = ( charCode + seg4->idDelta ) & 0xFFFF;
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else
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{
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/* otherwise, we must use the glyphIdArray to do it */
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index1 = seg4->idRangeOffset / 2
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+ ( charCode - seg4->startCount )
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+ ( seg4 - cmap4->segments )
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- segCount;
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if ( index1 < cmap4->numGlyphId &&
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cmap4->glyphIdArray[index1] != 0 )
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result = ( cmap4->glyphIdArray[index1] + seg4->idDelta ) & 0xFFFF;
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}
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return result;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
|
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/* code_to_index6 */
|
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/* */
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/* <Description> */
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/* Converts the character code into a glyph index. Uses format 6. */
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/* */
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/* <Input> */
|
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/* charCode :: The wanted character code. */
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/* cmap6 :: A pointer to a cmap table in format 6. */
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/* */
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/* <Return> */
|
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/* Glyph index into the glyphs array. 0 if the glyph does not exist. */
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/* */
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static
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FT_UInt code_to_index6( TT_CMapTable* cmap,
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FT_ULong charCode )
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{
|
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TT_CMap6* cmap6;
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FT_UInt result = 0;
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|
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cmap6 = &cmap->c.cmap6;
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result = 0;
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charCode -= cmap6->firstCode;
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if ( charCode < cmap6->entryCount )
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result = cmap6->glyphIdArray[charCode];
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return result;
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}
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/* END */
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