/*

 * 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/*

 *

 *

 * (C) Copyright IBM Corp. 1998-2006 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "LEGlyphFilter.h"

#include "OpenTypeTables.h"

#include "GlyphSubstitutionTables.h"

#include "LigatureSubstSubtables.h"

#include "GlyphIterator.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

{

    LEGlyphID glyph = glyphIterator->getCurrGlyphID();

    if (coverageIndex >= 0) {

        Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]);

        const LigatureSetTable *ligSetTable = (const LigatureSetTable *) ((char *) this + ligSetTableOffset);

        le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount);

        for (le_uint16 lig = 0; lig < ligCount; lig += 1) {

            Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]);

            const LigatureTable *ligTable = (const LigatureTable *) ((char *)ligSetTable + ligTableOffset);

            le_uint16 compCount = SWAPW(ligTable->compCount) - 1;

            le_int32 startPosition = glyphIterator->getCurrStreamPosition();

            TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph);

            le_uint16 comp;

            for (comp = 0; comp < compCount; comp += 1) {

                if (! glyphIterator->next()) {

                    break;

                }

                if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) {

                    break;

                }

            }

            if (comp == compCount && (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, ligGlyph)))) {

                GlyphIterator tempIterator(*glyphIterator);

                TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF;

                while (comp > 0) {

                    tempIterator.setCurrGlyphID(deletedGlyph);

                    tempIterator.prev();

                    comp -= 1;

                }

                tempIterator.setCurrGlyphID(ligGlyph);

                return compCount + 1;

            }

            glyphIterator->setCurrStreamPosition(startPosition);

        }

    }

    return 0;

}

U_NAMESPACE_END