1 /* 2 * (C) Copyright IBM Corp. 1998-2006 - All Rights Reserved 3 * 4 */ 5 6 #include "LETypes.h" 7 #include "LEGlyphFilter.h" 8 #include "OpenTypeTables.h" 9 #include "GlyphSubstitutionTables.h" 10 #include "LigatureSubstSubtables.h" 11 #include "GlyphIterator.h" 12 #include "LESwaps.h" 13 14 U_NAMESPACE_BEGIN 15 16 le_uint32 LigatureSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const 17 { 18 LEGlyphID glyph = glyphIterator->getCurrGlyphID(); 19 le_int32 coverageIndex = getGlyphCoverage(glyph); 20 21 if (coverageIndex >= 0) { 22 Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]); 23 const LigatureSetTable *ligSetTable = (const LigatureSetTable *) ((char *) this + ligSetTableOffset); 24 le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount); 25 26 for (le_uint16 lig = 0; lig < ligCount; lig += 1) { 27 Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]); 28 const LigatureTable *ligTable = (const LigatureTable *) ((char *)ligSetTable + ligTableOffset); 29 le_uint16 compCount = SWAPW(ligTable->compCount) - 1; 30 le_int32 startPosition = glyphIterator->getCurrStreamPosition(); 31 TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph); 32 le_uint16 comp; 33 34 for (comp = 0; comp < compCount; comp += 1) { 35 if (! glyphIterator->next()) { 36 break; 37 } 38 39 if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) { 40 break; 41 } 42 } 43 44 if (comp == compCount && (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, ligGlyph)))) { 45 GlyphIterator tempIterator(*glyphIterator); 46 TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF; 47 48 while (comp > 0) { 49 tempIterator.setCurrGlyphID(deletedGlyph); 50 tempIterator.prev(); 51 52 comp -= 1; 53 } 54 55 tempIterator.setCurrGlyphID(ligGlyph); 56 57 return compCount + 1; 58 } 59 60 glyphIterator->setCurrStreamPosition(startPosition); 61 } 62 63 } 64 65 return 0; 66 } 67 68 U_NAMESPACE_END 69
