113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
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/*
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* @(#)IndicLayoutEngine.cpp 1.3 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "LayoutEngine.h"
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#include "OpenTypeLayoutEngine.h"
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#include "IndicLayoutEngine.h"
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#include "ScriptAndLanguageTags.h"
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#include "GlyphSubstitutionTables.h"
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#include "GlyphDefinitionTables.h"
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#include "GlyphPositioningTables.h"
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#include "GDEFMarkFilter.h"
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#include "CDACLayout.h"
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#include "IndicReordering.h"
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IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
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GlyphSubstitutionTableHeader *gsubTable)
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: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable)
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{
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// nothing else to do...
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}
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IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
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: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode)
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{
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// nothing else to do...
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}
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IndicOpenTypeLayoutEngine::~IndicOpenTypeLayoutEngine()
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{
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// nothing to do
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}
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// Input: characters, tags
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// Output: glyphs, char indices
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le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, const LETag **featureTags,
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LEGlyphID *&glyphs, le_int32 *&charIndices)
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{
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le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, featureTags, glyphs, charIndices);
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IndicReordering::adjustMPres(&chars[offset], count, glyphs, charIndices, fScriptCode);
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return retCount;
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}
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// Input: characters
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// Output: characters, char indices, tags
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// Returns: output character count
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le_int32 IndicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
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LEUnicode *&outChars, le_int32 *&charIndices, const LETag **&featureTags)
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{
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le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
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outChars = new LEUnicode[worstCase];
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charIndices = new le_int32[worstCase];
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featureTags = new const LETag*[worstCase];
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// NOTE: assumes this allocates featureTags...
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// (probably better than doing the worst case stuff here...)
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return IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, charIndices, featureTags);
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}
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CDACOpenTypeLayoutEngine::CDACOpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
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const CDACLayout::ScriptInfo *scriptInfo)
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: IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode), fScriptInfo(scriptInfo)
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{
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fGSUBTable = (GlyphSubstitutionTableHeader *) fScriptInfo->glyphSubstitutionTable;
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fGDEFTable = (GlyphDefinitionTableHeader *) fScriptInfo->glyphDefinitionTable;
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}
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CDACOpenTypeLayoutEngine::~CDACOpenTypeLayoutEngine()
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{
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reset();
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}
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// "glyph" -> char
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// char -> glyph
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le_int32 CDACOpenTypeLayoutEngine::glyphPostProcessing(LEGlyphID tempGlyphs[], le_int32 tempCharIndices[], le_int32 tempGlyphCount,
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LEGlyphID *&glyphs, le_int32 *&charIndices)
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{
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LEUnicode *tempChars;
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le_int32 glyphCount = CDACLayout::countCDACGlyphs(fScriptInfo, tempGlyphs, tempGlyphCount);
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tempChars = new LEUnicode[glyphCount];
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glyphs = new LEGlyphID[glyphCount];
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charIndices = new le_int32[glyphCount];
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// NOTE: might want mapCDACGlyphsToChars to count output chars and allocate the array to hold them...
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// or it could make a guess and grow the array if the guess is too small...
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CDACLayout::mapCDACGlyphsToChars(fScriptInfo, tempGlyphs, tempCharIndices, tempGlyphCount, tempChars, charIndices);
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IndicOpenTypeLayoutEngine::mapCharsToGlyphs(tempChars, 0, glyphCount, false, false, glyphs, charIndices);
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delete[] tempChars;
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return glyphCount;
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}
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void CDACOpenTypeLayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror, LEGlyphID *&glyphs, le_int32 *&charIndices)
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{
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glyphs = new LEGlyphID[count];
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CDACLayout::initCDACGlyphs(fScriptInfo, chars, offset, count, glyphs);
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}
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