1 /* 2 * 3 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved 4 * 5 */ 6 7 #include "LETypes.h" 8 #include "MorphTables.h" 9 #include "StateTables.h" 10 #include "MorphStateTables.h" 11 #include "SubtableProcessor.h" 12 #include "StateTableProcessor.h" 13 #include "ContextualGlyphSubstProc.h" 14 #include "LEGlyphStorage.h" 15 #include "LESwaps.h" 16 17 U_NAMESPACE_BEGIN 18 19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor) 20 21 ContextualGlyphSubstitutionProcessor::ContextualGlyphSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader) 22 : StateTableProcessor(morphSubtableHeader) 23 { 24 contextualGlyphSubstitutionHeader = (const ContextualGlyphSubstitutionHeader *) morphSubtableHeader; 25 substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset); 26 27 entryTable = (const ContextualGlyphSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset); 28 } 29 30 ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor() 31 { 32 } 33 34 void ContextualGlyphSubstitutionProcessor::beginStateTable() 35 { 36 markGlyph = 0; 37 } 38 39 ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index) 40 { 41 const ContextualGlyphSubstitutionStateEntry *entry = &entryTable[index]; 42 ByteOffset newState = SWAPW(entry->newStateOffset); 43 le_int16 flags = SWAPW(entry->flags); 44 WordOffset markOffset = SWAPW(entry->markOffset); 45 WordOffset currOffset = SWAPW(entry->currOffset); 46 47 if (markOffset != 0) { 48 const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + markOffset * 2); 49 LEGlyphID mGlyph = glyphStorage[markGlyph]; 50 TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(mGlyph)]); 51 52 glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph); 53 } 54 55 if (currOffset != 0) { 56 const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + currOffset * 2); 57 LEGlyphID thisGlyph = glyphStorage[currGlyph]; 58 TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(thisGlyph)]); 59 60 glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph); 61 } 62 63 if (flags & cgsSetMark) { 64 markGlyph = currGlyph; 65 } 66 67 if (!(flags & cgsDontAdvance)) { 68 // should handle reverse too! 69 currGlyph += 1; 70 } 71 72 return newState; 73 } 74 75 void ContextualGlyphSubstitutionProcessor::endStateTable() 76 { 77 } 78 79 U_NAMESPACE_END 80
