47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*
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* @(#)AlternateSubstSubtables.cpp 1.7 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - 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 "AlternateSubstSubtables.h"
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#include "GlyphIterator.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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le_uint32 AlternateSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
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{
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// NOTE: For now, we'll just pick the first alternative...
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0) {
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le_uint16 altSetCount = SWAPW(alternateSetCount);
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if (coverageIndex < altSetCount) {
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Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]);
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const AlternateSetTable *alternateSetTable =
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(const AlternateSetTable *) ((char *) this + alternateSetTableOffset);
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TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);
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if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) {
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glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));
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}
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return 1;
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}
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// XXXX If we get here, the table's mal-formed...
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}
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return 0;
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}
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U_NAMESPACE_END
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