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