78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* @(#)LigatureSubstitutionSubtables.cpp 1.7 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 "LEGlyphFilter.h"
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#include "OpenTypeTables.h"
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#include "GlyphSubstitutionTables.h"
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#include "LigatureSubstitutionSubtables.h"
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#include "GlyphIterator.h"
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#include "LESwaps.h"
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le_uint32 LigatureSubstitutionSubtable::process(GlyphIterator *glyphIterator, LEGlyphFilter *filter)
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{
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LEGlyphID glyph = (LEGlyphID) glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0)
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{
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Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]);
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LigatureSetTable *ligSetTable = (LigatureSetTable *) ((char *) this + ligSetTableOffset);
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le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount);
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for (le_uint16 lig = 0; lig < ligCount; lig += 1)
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{
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Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]);
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LigatureTable *ligTable = (LigatureTable *) ((char *)ligSetTable + ligTableOffset);
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le_uint16 compCount = SWAPW(ligTable->compCount) - 1;
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le_int32 startPosition = glyphIterator->getCurrStreamPosition();
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LEGlyphID ligGlyph = SWAPW(ligTable->ligGlyph);
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le_uint16 comp;
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if (filter != NULL && ! filter->accept(ligGlyph))
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{
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continue;
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}
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for (comp = 0; comp < compCount; comp += 1)
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{
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if (! glyphIterator->next())
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{
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break;
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}
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if ((LEGlyphID) glyphIterator->getCurrGlyphID() != SWAPW(ligTable->componentArray[comp]))
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{
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break;
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}
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}
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if (comp == compCount)
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{
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GlyphIterator tempIterator(*glyphIterator);
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while (comp > 0)
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{
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tempIterator.setCurrGlyphID(0xFFFF);
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tempIterator.prev();
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comp -= 1;
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}
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tempIterator.setCurrGlyphID(ligGlyph);
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return compCount + 1;
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}
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glyphIterator->setCurrStreamPosition(startPosition);
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}
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}
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return 0;
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}
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