/*

 *

 * (C) Copyright IBM Corp. 1998-2004 - 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 = 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);

            TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);

            if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) {

                glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));

            }

            return 1;

        }

        // XXXX If we get here, the table's mal-formed...

    }

    return 0;

}

U_NAMESPACE_END