le_uint32 ChainingContextualSubstitutionFormat1Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
const LEFontInstance *fontInstance) const
{
LEGlyphID glyph = glyphIterator->getCurrGlyphID();
le_int32 coverageIndex = getGlyphCoverage(glyph);
if (coverageIndex >= 0) {
le_uint16 srSetCount = SWAPW(chainSubRuleSetCount);
if (coverageIndex < srSetCount) {
Offset chainSubRuleSetTableOffset = SWAPW(chainSubRuleSetTableOffsetArray[coverageIndex]);
const ChainSubRuleSetTable *chainSubRuleSetTable =
(const ChainSubRuleSetTable *) ((char *) this + chainSubRuleSetTableOffset);
le_uint16 chainSubRuleCount = SWAPW(chainSubRuleSetTable->chainSubRuleCount);
le_int32 position = glyphIterator->getCurrStreamPosition();
GlyphIterator tempIterator(*glyphIterator, emptyFeatureList);
for (le_uint16 subRule = 0; subRule < chainSubRuleCount; subRule += 1) {
Offset chainSubRuleTableOffset =
SWAPW(chainSubRuleSetTable->chainSubRuleTableOffsetArray[subRule]);
const ChainSubRuleTable *chainSubRuleTable =
(const ChainSubRuleTable *) ((char *) chainSubRuleSetTable + chainSubRuleTableOffset);
le_uint16 backtrackGlyphCount = SWAPW(chainSubRuleTable->backtrackGlyphCount);
le_uint16 inputGlyphCount = (le_uint16) SWAPW(chainSubRuleTable->backtrackGlyphArray[backtrackGlyphCount]) - 1;
const TTGlyphID *inputGlyphArray = &chainSubRuleTable->backtrackGlyphArray[backtrackGlyphCount + 1];
le_uint16 lookaheadGlyphCount = (le_uint16) SWAPW(inputGlyphArray[inputGlyphCount]);
const TTGlyphID *lookaheadGlyphArray = &inputGlyphArray[inputGlyphCount + 1];
le_uint16 substCount = (le_uint16) SWAPW(lookaheadGlyphArray[lookaheadGlyphCount]);
tempIterator.setCurrStreamPosition(position);
if (! tempIterator.prev(backtrackGlyphCount)) {
continue;
}
tempIterator.prev();
if (! matchGlyphIDs(chainSubRuleTable->backtrackGlyphArray, backtrackGlyphCount, &tempIterator, TRUE)) {
continue;
}
tempIterator.setCurrStreamPosition(position);
tempIterator.next(inputGlyphCount);
if (!matchGlyphIDs(lookaheadGlyphArray, lookaheadGlyphCount, &tempIterator)) {
continue;
}
if (matchGlyphIDs(inputGlyphArray, inputGlyphCount, glyphIterator)) {
const SubstitutionLookupRecord *substLookupRecordArray =
(const SubstitutionLookupRecord *) &lookaheadGlyphArray[lookaheadGlyphCount + 1];
applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
return inputGlyphCount + 1;
}
glyphIterator->setCurrStreamPosition(position);
}
}
// XXX If we get here, the table is mal-formed...
}
return 0;
}
U_NAMESPACE_BEGIN
le_uint32 MultipleSubstitutionSubtable::process(const LETableReference &base, GlyphIterator *glyphIterator, LEErrorCode& success, const LEGlyphFilter *filter) const
{
if (LE_FAILURE(success)) {
return 0;
}
LEGlyphID glyph = glyphIterator->getCurrGlyphID();
// If there's a filter, we only want to do the
// substitution if the *input* glyphs doesn't
// exist.
//
// FIXME: is this always the right thing to do?
// FIXME: should this only be done for a non-zero
// glyphCount?
if (filter != NULL && filter->accept(glyph)) {
return 0;
}
le_int32 coverageIndex = getGlyphCoverage(base, glyph, success);
le_uint16 seqCount = SWAPW(sequenceCount);
LEReferenceToArrayOf<Offset>
sequenceTableOffsetArrayRef(base, success, sequenceTableOffsetArray, seqCount);
if (LE_FAILURE(success)) {
return 0;
}
if (coverageIndex >= 0 && coverageIndex < seqCount) {
Offset sequenceTableOffset = SWAPW(sequenceTableOffsetArray[coverageIndex]);
const SequenceTable *sequenceTable = (const SequenceTable *) ((char *) this + sequenceTableOffset);
le_uint16 glyphCount = SWAPW(sequenceTable->glyphCount);
if (glyphCount == 0) {
glyphIterator->setCurrGlyphID(0xFFFF);
return 1;
} else if (glyphCount == 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[0]);
if (filter != NULL && ! filter->accept(LE_SET_GLYPH(glyph, substitute))) {
return 0;
}
glyphIterator->setCurrGlyphID(substitute);
return 1;
} else {
// If there's a filter, make sure all of the output glyphs
// exist.
if (filter != NULL) {
for (le_int32 i = 0; i < glyphCount; i += 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
if (! filter->accept(substitute)) {
return 0;
}
}
}
LEGlyphID *newGlyphs = glyphIterator->insertGlyphs(glyphCount, success);
if (LE_FAILURE(success)) {
return 0;
}
le_int32 insert = 0, direction = 1;
if (glyphIterator->isRightToLeft()) {
insert = glyphCount - 1;
direction = -1;
}
for (le_int32 i = 0; i < glyphCount; i += 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
newGlyphs[insert] = LE_SET_GLYPH(glyph, substitute);
insert += direction;
}
return 1;
}
}
return 0;
}
