projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| b75a7d8f A |
1 | /* |
| 2 | * %W% %E% | |
| 3 | * | |
| 4 | * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #include "LETypes.h" | |
| 9 | #include "LEGlyphFilter.h" | |
| 10 | #include "OpenTypeTables.h" | |
| 11 | #include "GlyphSubstitutionTables.h" | |
| 12 | #include "LigatureSubstSubtables.h" | |
| 13 | #include "GlyphIterator.h" | |
| 14 | #include "LESwaps.h" | |
| 15 | ||
| 16 | U_NAMESPACE_BEGIN | |
| 17 | ||
| 18 | le_uint32 LigatureSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const | |
| 19 | { | |
| 20 | LEGlyphID glyph = glyphIterator->getCurrGlyphID(); | |
| 21 | le_int32 coverageIndex = getGlyphCoverage(glyph); | |
| 22 | ||
| 23 | if (coverageIndex >= 0) { | |
| 24 | Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]); | |
| 25 | const LigatureSetTable *ligSetTable = (const LigatureSetTable *) ((char *) this + ligSetTableOffset); | |
| 26 | le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount); | |
| 27 | ||
| 28 | for (le_uint16 lig = 0; lig < ligCount; lig += 1) { | |
| 29 | Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]); | |
| 30 | const LigatureTable *ligTable = (const LigatureTable *) ((char *)ligSetTable + ligTableOffset); | |
| 31 | le_uint16 compCount = SWAPW(ligTable->compCount) - 1; | |
| 32 | le_int32 startPosition = glyphIterator->getCurrStreamPosition(); | |
| 33 | TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph); | |
| 34 | le_uint16 comp; | |
| 35 | ||
| 36 | if (filter != NULL && ! filter->accept(LE_SET_GLYPH(glyph, ligGlyph))) { | |
| 37 | continue; | |
| 38 | } | |
| 39 | ||
| 40 | for (comp = 0; comp < compCount; comp += 1) { | |
| 41 | if (! glyphIterator->next()) { | |
| 42 | break; | |
| 43 | } | |
| 44 | ||
| 45 | if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) { | |
| 46 | break; | |
| 47 | } | |
| 48 | } | |
| 49 | ||
| 50 | if (comp == compCount) { | |
| 51 | GlyphIterator tempIterator(*glyphIterator); | |
| 52 | TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF; | |
| 53 | ||
| 54 | while (comp > 0) { | |
| 55 | tempIterator.setCurrGlyphID(deletedGlyph); | |
| 56 | tempIterator.prev(); | |
| 57 | ||
| 58 | comp -= 1; | |
| 59 | } | |
| 60 | ||
| 61 | tempIterator.setCurrGlyphID(ligGlyph); | |
| 62 | ||
| 63 | return compCount + 1; | |
| 64 | } | |
| 65 | ||
| 66 | glyphIterator->setCurrStreamPosition(startPosition); | |
| 67 | } | |
| 68 | ||
| 69 | } | |
| 70 | ||
| 71 | return 0; | |
| 72 | } | |
| 73 | ||
| 74 | U_NAMESPACE_END |