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/*
*
* (C) Copyright IBM Corp. 1998-2006 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "LEFontInstance.h"
#include "OpenTypeTables.h"
#include "GlyphPositioningTables.h"
#include "PairPositioningSubtables.h"
#include "ValueRecords.h"
#include "GlyphIterator.h"
#include "OpenTypeUtilities.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
le_uint32 PairPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
{
switch(SWAPW(subtableFormat))
{
case 0:
return 0;
case 1:
{
const PairPositioningFormat1Subtable *subtable = (const PairPositioningFormat1Subtable *) this;
return subtable->process(glyphIterator, fontInstance);
}
case 2:
{
const PairPositioningFormat2Subtable *subtable = (const PairPositioningFormat2Subtable *) this;
return subtable->process(glyphIterator, fontInstance);
}
default:
return 0;
}
}
le_uint32 PairPositioningFormat1Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
{
LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
GlyphIterator tempIterator(*glyphIterator);
if (coverageIndex >= 0 && glyphIterator->next()) {
Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);
PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);
le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);
le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;
LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
const PairValueRecord *pairValueRecord = NULL;
if (pairValueCount != 0) {
pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);
}
if (pairValueRecord == NULL) {
return 0;
}
if (valueFormat1 != 0) {
pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
}
if (valueFormat2 != 0) {
const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);
valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);
}
// back up glyphIterator so second glyph can be
// first glyph in the next pair
glyphIterator->prev();
return 1;
}
return 0;
}
le_uint32 PairPositioningFormat2Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
{
LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
GlyphIterator tempIterator(*glyphIterator);
if (coverageIndex >= 0 && glyphIterator->next()) {
LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));
const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));
le_int32 class1 = classDef1->getGlyphClass(firstGlyph);
le_int32 class2 = classDef2->getGlyphClass(secondGlyph);
le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;
le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);
const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));
const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));
if (valueFormat1 != 0) {
class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
}
if (valueFormat2 != 0) {
const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);
valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);
}
// back up glyphIterator so second glyph can be
// first glyph in the next pair
glyphIterator->prev();
return 1;
}
return 0;
}
const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const
{
#if 1
// The OpenType spec. says that the ValueRecord table is
// sorted by secondGlyph. Unfortunately, there are fonts
// around that have an unsorted ValueRecord table.
const PairValueRecord *record = records;
for(le_int32 r = 0; r < recordCount; r += 1) {
if (SWAPW(record->secondGlyph) == glyphID) {
return record;
}
record = (const PairValueRecord *) ((char *) record + recordSize);
}
#else
le_uint8 bit = OpenTypeUtilities::highBit(recordCount);
le_uint16 power = 1 << bit;
le_uint16 extra = (recordCount - power) * recordSize;
le_uint16 probe = power * recordSize;
const PairValueRecord *record = records;
const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);
if (SWAPW(trial->secondGlyph) <= glyphID) {
record = trial;
}
while (probe > recordSize) {
probe >>= 1;
trial = (const PairValueRecord *) ((char *) record + probe);
if (SWAPW(trial->secondGlyph) <= glyphID) {
record = trial;
}
}
if (SWAPW(record->secondGlyph) == glyphID) {
return record;
}
#endif
return NULL;
}
U_NAMESPACE_END
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