sl@0: /*
sl@0:  * %W% %E%
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEGlyphFilter.h"
sl@0: #include "OpenTypeTables.h"
sl@0: #include "GlyphSubstitutionTables.h"
sl@0: #include "LigatureSubstSubtables.h"
sl@0: #include "GlyphIterator.h"
sl@0: #include "LESwaps.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: le_uint32 LigatureSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
sl@0: {
sl@0:     LEGlyphID glyph = glyphIterator->getCurrGlyphID();
sl@0:     le_int32 coverageIndex = getGlyphCoverage(glyph);
sl@0: 
sl@0:     if (coverageIndex >= 0) {
sl@0:         Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]);
sl@0:         const LigatureSetTable *ligSetTable = (const LigatureSetTable *) ((char *) this + ligSetTableOffset);
sl@0:         le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount);
sl@0: 
sl@0:         for (le_uint16 lig = 0; lig < ligCount; lig += 1) {
sl@0:             Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]);
sl@0:             const LigatureTable *ligTable = (const LigatureTable *) ((char *)ligSetTable + ligTableOffset);
sl@0:             le_uint16 compCount = SWAPW(ligTable->compCount) - 1;
sl@0:             le_int32 startPosition = glyphIterator->getCurrStreamPosition();
sl@0:             TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph);
sl@0:             le_uint16 comp;
sl@0: 
sl@0:             if (filter != NULL && ! filter->accept(LE_SET_GLYPH(glyph, ligGlyph))) {
sl@0:                 continue;
sl@0:             }
sl@0: 
sl@0:             for (comp = 0; comp < compCount; comp += 1) {
sl@0:                 if (! glyphIterator->next()) {
sl@0:                     break;
sl@0:                 }
sl@0: 
sl@0:                 if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) {
sl@0:                     break;
sl@0:                 }
sl@0:             }
sl@0: 
sl@0:             if (comp == compCount) {
sl@0:                 GlyphIterator tempIterator(*glyphIterator);
sl@0:                 TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF;
sl@0: 
sl@0:                 while (comp > 0) {
sl@0:                     tempIterator.setCurrGlyphID(deletedGlyph);
sl@0:                     tempIterator.prev();
sl@0: 
sl@0:                     comp -= 1;
sl@0:                 }
sl@0: 
sl@0:                 tempIterator.setCurrGlyphID(ligGlyph);
sl@0: 
sl@0:                 return compCount + 1;
sl@0:             }
sl@0: 
sl@0:             glyphIterator->setCurrStreamPosition(startPosition);
sl@0:         }
sl@0: 
sl@0:     }
sl@0: 
sl@0:     return 0;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END