/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

/*

 *

 * (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"

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;

}