sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEFontInstance.h"
sl@0: #include "OpenTypeTables.h"
sl@0: #include "GlyphPositioningTables.h"
sl@0: #include "PairPositioningSubtables.h"
sl@0: #include "ValueRecords.h"
sl@0: #include "GlyphIterator.h"
sl@0: #include "OpenTypeUtilities.h"
sl@0: #include "LESwaps.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: le_uint32 PairPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
sl@0: {
sl@0:     switch(SWAPW(subtableFormat))
sl@0:     {
sl@0:     case 0:
sl@0:         return 0;
sl@0: 
sl@0:     case 1:
sl@0:     {
sl@0:         const PairPositioningFormat1Subtable *subtable = (const PairPositioningFormat1Subtable *) this;
sl@0: 
sl@0:         return subtable->process(glyphIterator, fontInstance);
sl@0:     }
sl@0: 
sl@0:     case 2:
sl@0:     {
sl@0:         const PairPositioningFormat2Subtable *subtable = (const PairPositioningFormat2Subtable *) this;
sl@0: 
sl@0:         return subtable->process(glyphIterator, fontInstance);
sl@0:     }
sl@0: 
sl@0:     default:
sl@0:         return 0;
sl@0:     }
sl@0: }
sl@0: 
sl@0: le_uint32 PairPositioningFormat1Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
sl@0: {
sl@0:     LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
sl@0:     le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
sl@0:     GlyphIterator tempIterator(*glyphIterator);
sl@0: 
sl@0:     if (coverageIndex >= 0 && glyphIterator->next()) {
sl@0:         Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);
sl@0:         PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);
sl@0:         le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);
sl@0:         le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
sl@0:         le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
sl@0:         le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;
sl@0:         LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
sl@0:         const PairValueRecord *pairValueRecord = NULL;
sl@0: 
sl@0:         if (pairValueCount != 0) {
sl@0:             pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);
sl@0:         }
sl@0: 
sl@0:         if (pairValueRecord == NULL) {
sl@0:             return 0;
sl@0:         }
sl@0: 
sl@0:         if (valueFormat1 != 0) {
sl@0:             pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
sl@0:         }
sl@0: 
sl@0:         if (valueFormat2 != 0) {
sl@0:             const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);
sl@0: 
sl@0:             valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);
sl@0:         }
sl@0: 
sl@0:         return 2;
sl@0:     }
sl@0: 
sl@0:     return 0;
sl@0: }
sl@0: 
sl@0: le_uint32 PairPositioningFormat2Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
sl@0: {
sl@0:     LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
sl@0:     le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
sl@0:     GlyphIterator tempIterator(*glyphIterator);
sl@0: 
sl@0:     if (coverageIndex >= 0 && glyphIterator->next()) {
sl@0:         LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
sl@0:         const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));
sl@0:         const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));
sl@0:         le_int32 class1 = classDef1->getGlyphClass(firstGlyph);
sl@0:         le_int32 class2 = classDef2->getGlyphClass(secondGlyph);
sl@0:         le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
sl@0:         le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
sl@0:         le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;
sl@0:         le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);
sl@0:         const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));
sl@0:         const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));
sl@0: 
sl@0: 
sl@0:         if (valueFormat1 != 0) {
sl@0:             class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
sl@0:         }
sl@0: 
sl@0:         if (valueFormat2 != 0) {
sl@0:             const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);
sl@0: 
sl@0:             valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);
sl@0:         }
sl@0: 
sl@0:         return 2;
sl@0:     }
sl@0: 
sl@0:     return 0;
sl@0: }
sl@0: 
sl@0: const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const
sl@0: {
sl@0:     le_uint8 bit = OpenTypeUtilities::highBit(recordCount);
sl@0:     le_uint16 power = 1 << bit;
sl@0:     le_uint16 extra = (recordCount - power) * recordSize;
sl@0:     le_uint16 probe = power * recordSize;
sl@0:     const PairValueRecord *record = records;
sl@0:     const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);
sl@0: 
sl@0:     if (SWAPW(trial->secondGlyph) <= glyphID) {
sl@0:         record = trial;
sl@0:     }
sl@0: 
sl@0:     while (probe > recordSize) {
sl@0:         probe >>= 1;
sl@0:         trial = (const PairValueRecord *) ((char *) record + probe);
sl@0: 
sl@0:         if (SWAPW(trial->secondGlyph) <= glyphID) {
sl@0:             record = trial;
sl@0:         }
sl@0:     }
sl@0: 
sl@0:     if (SWAPW(record->secondGlyph) == glyphID) {
sl@0:         return record;
sl@0:     }
sl@0: 
sl@0:     return NULL;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END