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