| | 1 | /* |
| | 2 | * (C) Copyright IBM Corp. 1998-2015 - 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(const LETableReference &base, GlyphIterator *glyphIterator, LEErrorCode &success, const LEGlyphFilter *filter) const |
| | 17 | { |
| | 18 | LEGlyphID glyph = glyphIterator->getCurrGlyphID(); |
| | 19 | le_int32 coverageIndex = getGlyphCoverage(base, glyph, success); |
| | 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 | LEReferenceToArrayOf<TTGlyphID> |
| | 31 | componentArrayRef(base, success, ligTable->componentArray, compCount); |
| | 32 | if (LE_FAILURE(success)) { return 0; } |
| | 33 | le_int32 startPosition = glyphIterator->getCurrStreamPosition(); |
| | 34 | TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph); |
| | 35 | le_uint16 comp; |
| | 36 | |
| | 37 | for (comp = 0; comp < compCount; comp += 1) { |
| | 38 | if (! glyphIterator->next()) { |
| | 39 | break; |
| | 40 | } |
| | 41 | |
| | 42 | if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) { |
| | 43 | break; |
| | 44 | } |
| | 45 | } |
| | 46 | |
| | 47 | if (comp == compCount && (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, ligGlyph)))) { |
| | 48 | GlyphIterator tempIterator(*glyphIterator); |
| | 49 | TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF; |
| | 50 | |
| | 51 | while (comp > 0) { |
| | 52 | tempIterator.setCurrGlyphID(deletedGlyph); |
| | 53 | tempIterator.prev(); |
| | 54 | |
| | 55 | comp -= 1; |
| | 56 | } |
| | 57 | |
| | 58 | tempIterator.setCurrGlyphID(ligGlyph); |
| | 59 | |
| | 60 | return compCount + 1; |
| | 61 | } |
| | 62 | |
| | 63 | glyphIterator->setCurrStreamPosition(startPosition); |
| | 64 | } |
| | 65 | |
| | 66 | } |
| | 67 | |
| | 68 | return 0; |
| | 69 | } |
| | 70 | |
| | 71 | U_NAMESPACE_END |
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