521 lines
21 KiB
C++
521 lines
21 KiB
C++
/*
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* @(#)ContextualSubstSubtables.cpp 1.11 00/03/15
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*
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* (C) Copyright IBM Corp. 1998-2003 - 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 "GlyphSubstitutionTables.h"
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#include "ContextualSubstSubtables.h"
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#include "GlyphIterator.h"
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#include "LookupProcessor.h"
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#include "CoverageTables.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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/*
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NOTE: This could be optimized somewhat by keeping track
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of the previous sequenceIndex in the loop and doing next()
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or prev() of the delta between that and the current
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sequenceIndex instead of always resetting to the front.
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*/
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void ContextualSubstitutionBase::applySubstitutionLookups(
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const LookupProcessor *lookupProcessor,
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const SubstitutionLookupRecord *substLookupRecordArray,
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le_uint16 substCount,
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GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance,
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le_int32 position)
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{
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GlyphIterator tempIterator(*glyphIterator);
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for (le_int16 subst = 0; subst < substCount; subst += 1) {
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le_uint16 sequenceIndex = SWAPW(substLookupRecordArray[subst].sequenceIndex);
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le_uint16 lookupListIndex = SWAPW(substLookupRecordArray[subst].lookupListIndex);
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tempIterator.setCurrStreamPosition(position);
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tempIterator.next(sequenceIndex);
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lookupProcessor->applySingleLookup(lookupListIndex, &tempIterator, fontInstance);
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}
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}
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le_bool ContextualSubstitutionBase::matchGlyphIDs(const TTGlyphID *glyphArray, le_uint16 glyphCount,
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GlyphIterator *glyphIterator, le_bool backtrack)
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{
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le_int32 direction = 1;
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le_int32 match = 0;
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if (backtrack) {
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match = glyphCount -1;
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direction = -1;
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}
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while (glyphCount > 0) {
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if (! glyphIterator->next()) {
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return false;
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}
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TTGlyphID glyph = (TTGlyphID) glyphIterator->getCurrGlyphID();
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if (glyph != SWAPW(glyphArray[match])) {
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return false;
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}
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glyphCount -= 1;
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match += direction;
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}
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return true;
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}
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le_bool ContextualSubstitutionBase::matchGlyphClasses(const le_uint16 *classArray, le_uint16 glyphCount,
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GlyphIterator *glyphIterator,
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const ClassDefinitionTable *classDefinitionTable,
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le_bool backtrack)
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{
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le_int32 direction = 1;
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le_int32 match = 0;
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if (backtrack) {
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match = glyphCount - 1;
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direction = -1;
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}
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while (glyphCount > 0) {
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if (! glyphIterator->next()) {
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return false;
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}
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 glyphClass = classDefinitionTable->getGlyphClass(glyph);
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le_int32 matchClass = SWAPW(classArray[match]);
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if (glyphClass != matchClass) {
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// Some fonts, e.g. Traditional Arabic, have classes
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// in the class array which aren't in the class definition
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// table. If we're looking for such a class, pretend that
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// we found it.
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if (classDefinitionTable->hasGlyphClass(matchClass)) {
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return false;
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}
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}
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glyphCount -= 1;
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match += direction;
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}
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return true;
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}
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le_bool ContextualSubstitutionBase::matchGlyphCoverages(const Offset *coverageTableOffsetArray, le_uint16 glyphCount,
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GlyphIterator *glyphIterator, const char *offsetBase, le_bool backtrack)
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{
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le_int32 direction = 1;
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le_int32 glyph = 0;
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if (backtrack) {
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glyph = glyphCount - 1;
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direction = -1;
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}
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while (glyphCount > 0) {
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Offset coverageTableOffset = SWAPW(coverageTableOffsetArray[glyph]);
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const CoverageTable *coverageTable = (const CoverageTable *) (offsetBase + coverageTableOffset);
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if (! glyphIterator->next()) {
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return false;
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}
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if (coverageTable->getGlyphCoverage((LEGlyphID) glyphIterator->getCurrGlyphID()) < 0) {
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return false;
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}
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glyphCount -= 1;
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glyph += direction;
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}
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return true;
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}
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le_uint32 ContextualSubstitutionSubtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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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 ContextualSubstitutionFormat1Subtable *subtable = (const ContextualSubstitutionFormat1Subtable *) this;
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return subtable->process(lookupProcessor, glyphIterator, fontInstance);
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}
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case 2:
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{
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const ContextualSubstitutionFormat2Subtable *subtable = (const ContextualSubstitutionFormat2Subtable *) this;
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return subtable->process(lookupProcessor, glyphIterator, fontInstance);
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}
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case 3:
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{
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const ContextualSubstitutionFormat3Subtable *subtable = (const ContextualSubstitutionFormat3Subtable *) this;
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return subtable->process(lookupProcessor, 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 ContextualSubstitutionFormat1Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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{
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0) {
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le_uint16 srSetCount = SWAPW(subRuleSetCount);
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if (coverageIndex < srSetCount) {
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Offset subRuleSetTableOffset = SWAPW(subRuleSetTableOffsetArray[coverageIndex]);
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const SubRuleSetTable *subRuleSetTable =
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(const SubRuleSetTable *) ((char *) this + subRuleSetTableOffset);
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le_uint16 subRuleCount = SWAPW(subRuleSetTable->subRuleCount);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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for (le_uint16 subRule = 0; subRule < subRuleCount; subRule += 1) {
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Offset subRuleTableOffset =
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SWAPW(subRuleSetTable->subRuleTableOffsetArray[subRule]);
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const SubRuleTable *subRuleTable =
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(const SubRuleTable *) ((char *) subRuleSetTable + subRuleTableOffset);
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le_uint16 matchCount = SWAPW(subRuleTable->glyphCount) - 1;
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le_uint16 substCount = SWAPW(subRuleTable->substCount);
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if (matchGlyphIDs(subRuleTable->inputGlyphArray, matchCount, glyphIterator)) {
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const SubstitutionLookupRecord *substLookupRecordArray =
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(const SubstitutionLookupRecord *) &subRuleTable->inputGlyphArray[matchCount];
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applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
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return matchCount + 1;
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}
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glyphIterator->setCurrStreamPosition(position);
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}
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}
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// XXX If we get here, the table is mal-formed...
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}
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return 0;
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}
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le_uint32 ContextualSubstitutionFormat2Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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{
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0) {
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const ClassDefinitionTable *classDefinitionTable =
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(const ClassDefinitionTable *) ((char *) this + SWAPW(classDefTableOffset));
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le_uint16 scSetCount = SWAPW(subClassSetCount);
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le_int32 setClass = classDefinitionTable->getGlyphClass(glyphIterator->getCurrGlyphID());
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if (setClass < scSetCount && subClassSetTableOffsetArray[setClass] != 0) {
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Offset subClassSetTableOffset = SWAPW(subClassSetTableOffsetArray[setClass]);
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const SubClassSetTable *subClassSetTable =
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(const SubClassSetTable *) ((char *) this + subClassSetTableOffset);
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le_uint16 subClassRuleCount = SWAPW(subClassSetTable->subClassRuleCount);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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for (le_uint16 scRule = 0; scRule < subClassRuleCount; scRule += 1) {
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Offset subClassRuleTableOffset =
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SWAPW(subClassSetTable->subClassRuleTableOffsetArray[scRule]);
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const SubClassRuleTable *subClassRuleTable =
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(const SubClassRuleTable *) ((char *) subClassSetTable + subClassRuleTableOffset);
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le_uint16 matchCount = SWAPW(subClassRuleTable->glyphCount) - 1;
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le_uint16 substCount = SWAPW(subClassRuleTable->substCount);
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if (matchGlyphClasses(subClassRuleTable->classArray, matchCount, glyphIterator, classDefinitionTable)) {
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const SubstitutionLookupRecord *substLookupRecordArray =
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(const SubstitutionLookupRecord *) &subClassRuleTable->classArray[matchCount];
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applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
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return matchCount + 1;
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}
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glyphIterator->setCurrStreamPosition(position);
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}
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}
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// XXX If we get here, the table is mal-formed...
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}
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return 0;
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}
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le_uint32 ContextualSubstitutionFormat3Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance)const
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{
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le_uint16 gCount = SWAPW(glyphCount);
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le_uint16 subCount = SWAPW(substCount);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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// Back up the glyph iterator so that we
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// can call next() before the check, which
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// will leave it pointing at the last glyph
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// that matched when we're done.
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glyphIterator->prev();
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if (ContextualSubstitutionBase::matchGlyphCoverages(coverageTableOffsetArray, gCount, glyphIterator, (const char *) this)) {
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const SubstitutionLookupRecord *substLookupRecordArray =
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(const SubstitutionLookupRecord *) &coverageTableOffsetArray[gCount];
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ContextualSubstitutionBase::applySubstitutionLookups(lookupProcessor, substLookupRecordArray, subCount, glyphIterator, fontInstance, position);
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return gCount + 1;
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}
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glyphIterator->setCurrStreamPosition(position);
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return 0;
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}
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le_uint32 ChainingContextualSubstitutionSubtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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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 ChainingContextualSubstitutionFormat1Subtable *subtable = (const ChainingContextualSubstitutionFormat1Subtable *) this;
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return subtable->process(lookupProcessor, glyphIterator, fontInstance);
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}
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case 2:
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{
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const ChainingContextualSubstitutionFormat2Subtable *subtable = (const ChainingContextualSubstitutionFormat2Subtable *) this;
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return subtable->process(lookupProcessor, glyphIterator, fontInstance);
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}
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case 3:
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{
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const ChainingContextualSubstitutionFormat3Subtable *subtable = (const ChainingContextualSubstitutionFormat3Subtable *) this;
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return subtable->process(lookupProcessor, 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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const LETag emptyTag = 0;
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le_uint32 ChainingContextualSubstitutionFormat1Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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{
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0) {
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le_uint16 srSetCount = SWAPW(chainSubRuleSetCount);
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if (coverageIndex < srSetCount) {
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Offset chainSubRuleSetTableOffset = SWAPW(chainSubRuleSetTableOffsetArray[coverageIndex]);
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const ChainSubRuleSetTable *chainSubRuleSetTable =
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(const ChainSubRuleSetTable *) ((char *) this + chainSubRuleSetTableOffset);
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le_uint16 chainSubRuleCount = SWAPW(chainSubRuleSetTable->chainSubRuleCount);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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GlyphIterator tempIterator(*glyphIterator, emptyTag);
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for (le_uint16 subRule = 0; subRule < chainSubRuleCount; subRule += 1) {
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Offset chainSubRuleTableOffset =
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SWAPW(chainSubRuleSetTable->chainSubRuleTableOffsetArray[subRule]);
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const ChainSubRuleTable *chainSubRuleTable =
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(const ChainSubRuleTable *) ((char *) chainSubRuleSetTable + chainSubRuleTableOffset);
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le_uint16 backtrackGlyphCount = SWAPW(chainSubRuleTable->backtrackGlyphCount);
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le_uint16 inputGlyphCount = (le_uint16) SWAPW(chainSubRuleTable->backtrackGlyphArray[backtrackGlyphCount]) - 1;
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const TTGlyphID *inputGlyphArray = &chainSubRuleTable->backtrackGlyphArray[backtrackGlyphCount + 1];
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le_uint16 lookaheadGlyphCount = (le_uint16) SWAPW(inputGlyphArray[inputGlyphCount]);
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const TTGlyphID *lookaheadGlyphArray = &inputGlyphArray[inputGlyphCount + 1];
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le_uint16 substCount = (le_uint16) SWAPW(lookaheadGlyphArray[lookaheadGlyphCount]);
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tempIterator.setCurrStreamPosition(position);
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if (! tempIterator.prev(backtrackGlyphCount)) {
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continue;
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}
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tempIterator.prev();
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if (! matchGlyphIDs(chainSubRuleTable->backtrackGlyphArray, backtrackGlyphCount, &tempIterator, true)) {
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continue;
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}
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tempIterator.setCurrStreamPosition(position);
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tempIterator.next(inputGlyphCount);
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if (!matchGlyphIDs(lookaheadGlyphArray, lookaheadGlyphCount, &tempIterator)) {
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continue;
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}
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if (matchGlyphIDs(inputGlyphArray, inputGlyphCount, glyphIterator)) {
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const SubstitutionLookupRecord *substLookupRecordArray =
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(const SubstitutionLookupRecord *) &lookaheadGlyphArray[lookaheadGlyphCount + 1];
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applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
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return inputGlyphCount + 1;
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}
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glyphIterator->setCurrStreamPosition(position);
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}
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}
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// XXX If we get here, the table is mal-formed...
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}
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return 0;
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}
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le_uint32 ChainingContextualSubstitutionFormat2Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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{
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LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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le_int32 coverageIndex = getGlyphCoverage(glyph);
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if (coverageIndex >= 0) {
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const ClassDefinitionTable *backtrackClassDefinitionTable =
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(const ClassDefinitionTable *) ((char *) this + SWAPW(backtrackClassDefTableOffset));
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const ClassDefinitionTable *inputClassDefinitionTable =
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(const ClassDefinitionTable *) ((char *) this + SWAPW(inputClassDefTableOffset));
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const ClassDefinitionTable *lookaheadClassDefinitionTable =
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(const ClassDefinitionTable *) ((char *) this + SWAPW(lookaheadClassDefTableOffset));
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le_uint16 scSetCount = SWAPW(chainSubClassSetCount);
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le_int32 setClass = inputClassDefinitionTable->getGlyphClass(glyphIterator->getCurrGlyphID());
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if (setClass < scSetCount && chainSubClassSetTableOffsetArray[setClass] != 0) {
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Offset chainSubClassSetTableOffset = SWAPW(chainSubClassSetTableOffsetArray[setClass]);
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const ChainSubClassSetTable *chainSubClassSetTable =
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(const ChainSubClassSetTable *) ((char *) this + chainSubClassSetTableOffset);
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le_uint16 chainSubClassRuleCount = SWAPW(chainSubClassSetTable->chainSubClassRuleCount);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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GlyphIterator tempIterator(*glyphIterator, emptyTag);
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for (le_uint16 scRule = 0; scRule < chainSubClassRuleCount; scRule += 1) {
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Offset chainSubClassRuleTableOffset =
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SWAPW(chainSubClassSetTable->chainSubClassRuleTableOffsetArray[scRule]);
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const ChainSubClassRuleTable *chainSubClassRuleTable =
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(const ChainSubClassRuleTable *) ((char *) chainSubClassSetTable + chainSubClassRuleTableOffset);
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le_uint16 backtrackGlyphCount = SWAPW(chainSubClassRuleTable->backtrackGlyphCount);
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le_uint16 inputGlyphCount = SWAPW(chainSubClassRuleTable->backtrackClassArray[backtrackGlyphCount]) - 1;
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const le_uint16 *inputClassArray = &chainSubClassRuleTable->backtrackClassArray[backtrackGlyphCount + 1];
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le_uint16 lookaheadGlyphCount = SWAPW(inputClassArray[inputGlyphCount]);
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const le_uint16 *lookaheadClassArray = &inputClassArray[inputGlyphCount + 1];
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le_uint16 substCount = SWAPW(lookaheadClassArray[lookaheadGlyphCount]);
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tempIterator.setCurrStreamPosition(position);
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if (! tempIterator.prev(backtrackGlyphCount)) {
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continue;
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}
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tempIterator.prev();
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if (! matchGlyphClasses(chainSubClassRuleTable->backtrackClassArray, backtrackGlyphCount,
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&tempIterator, backtrackClassDefinitionTable, true)) {
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continue;
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}
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tempIterator.setCurrStreamPosition(position);
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tempIterator.next(inputGlyphCount);
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if (! matchGlyphClasses(lookaheadClassArray, lookaheadGlyphCount, &tempIterator, lookaheadClassDefinitionTable)) {
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continue;
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}
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if (matchGlyphClasses(inputClassArray, inputGlyphCount, glyphIterator, inputClassDefinitionTable)) {
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const SubstitutionLookupRecord *substLookupRecordArray =
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(const SubstitutionLookupRecord *) &lookaheadClassArray[lookaheadGlyphCount + 1];
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applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
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return inputGlyphCount + 1;
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}
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glyphIterator->setCurrStreamPosition(position);
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}
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}
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// XXX If we get here, the table is mal-formed...
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}
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return 0;
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}
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le_uint32 ChainingContextualSubstitutionFormat3Subtable::process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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{
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le_uint16 backtrkGlyphCount = SWAPW(backtrackGlyphCount);
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le_uint16 inputGlyphCount = (le_uint16) SWAPW(backtrackCoverageTableOffsetArray[backtrkGlyphCount]);
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const Offset *inputCoverageTableOffsetArray = &backtrackCoverageTableOffsetArray[backtrkGlyphCount + 1];
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const le_uint16 lookaheadGlyphCount = (le_uint16) SWAPW(inputCoverageTableOffsetArray[inputGlyphCount]);
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const Offset *lookaheadCoverageTableOffsetArray = &inputCoverageTableOffsetArray[inputGlyphCount + 1];
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le_uint16 substCount = (le_uint16) SWAPW(lookaheadCoverageTableOffsetArray[lookaheadGlyphCount]);
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le_int32 position = glyphIterator->getCurrStreamPosition();
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GlyphIterator tempIterator(*glyphIterator, emptyTag);
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if (! tempIterator.prev(backtrkGlyphCount)) {
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return 0;
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}
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tempIterator.prev();
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if (! ContextualSubstitutionBase::matchGlyphCoverages(backtrackCoverageTableOffsetArray,
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backtrkGlyphCount, &tempIterator, (const char *) this, true)) {
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return 0;
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}
|
|
|
|
tempIterator.setCurrStreamPosition(position);
|
|
tempIterator.next(inputGlyphCount - 1);
|
|
if (! ContextualSubstitutionBase::matchGlyphCoverages(lookaheadCoverageTableOffsetArray,
|
|
lookaheadGlyphCount, &tempIterator, (const char *) this)) {
|
|
return 0;
|
|
}
|
|
|
|
// Back up the glyph iterator so that we
|
|
// can call next() before the check, which
|
|
// will leave it pointing at the last glyph
|
|
// that matched when we're done.
|
|
glyphIterator->prev();
|
|
|
|
if (ContextualSubstitutionBase::matchGlyphCoverages(inputCoverageTableOffsetArray,
|
|
inputGlyphCount, glyphIterator, (const char *) this)) {
|
|
const SubstitutionLookupRecord *substLookupRecordArray =
|
|
(const SubstitutionLookupRecord *) &lookaheadCoverageTableOffsetArray[lookaheadGlyphCount + 1];
|
|
|
|
ContextualSubstitutionBase::applySubstitutionLookups(lookupProcessor, substLookupRecordArray, substCount, glyphIterator, fontInstance, position);
|
|
|
|
return inputGlyphCount;
|
|
}
|
|
|
|
glyphIterator->setCurrStreamPosition(position);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_NAMESPACE_END
|