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* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
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#include "OpenTypeUtilities.h"
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#include "LEFontInstance.h"
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#include "OpenTypeTables.h"
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#include "ScriptAndLanguage.h"
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#include "GlyphDefinitionTables.h"
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#include "GlyphPositionAdjustments.h"
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#include "LookupProcessor.h"
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const LETag LookupProcessor::notSelected = 0x00000000;
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const LETag LookupProcessor::defaultFeature = 0xFFFFFFFF;
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const LETag emptyTag = 0x00000000;
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le_uint32 LookupProcessor::applyLookupTable(const LookupTable *lookupTable, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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le_uint16 lookupType = SWAPW(lookupTable->lookupType);
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le_uint16 subtableCount = SWAPW(lookupTable->subTableCount);
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le_int32 startPosition = glyphIterator->getCurrStreamPosition();
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for (le_uint16 subtable = 0; subtable < subtableCount; subtable += 1) {
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const LookupSubtable *lookupSubtable = lookupTable->getLookupSubtable(subtable);
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delta = applySubtable(lookupSubtable, lookupType, glyphIterator, fontInstance);
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glyphIterator->setCurrStreamPosition(startPosition);
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void LookupProcessor::process(LEGlyphID *glyphs, GlyphPositionAdjustment *glyphPositionAdjustments, const LETag **glyphTags, le_int32 glyphCount,
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le_bool rightToLeft, const GlyphDefinitionTableHeader *glyphDefinitionTableHeader,
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const LEFontInstance *fontInstance) const
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if (lookupSelectArray == NULL) {
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for (le_uint16 order = 0; order < lookupOrderCount; order += 1) {
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le_uint16 lookup = lookupOrderArray[order];
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LETag selectTag = lookupSelectArray[lookup];
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if (selectTag != notSelected) {
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const LookupTable *lookupTable = lookupListTable->getLookupTable(lookup);
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le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
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GlyphIterator glyphIterator(glyphs, glyphPositionAdjustments, glyphCount,
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rightToLeft, lookupFlags, selectTag, glyphTags,
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glyphDefinitionTableHeader);
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while (glyphIterator.findFeatureTag()) {
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while (glyphIterator.next(delta)) {
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delta = applyLookupTable(lookupTable, &glyphIterator, fontInstance);
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le_uint32 LookupProcessor::applySingleLookup(le_uint16 lookupTableIndex, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance) const
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const LookupTable *lookupTable = lookupListTable->getLookupTable(lookupTableIndex);
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le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
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GlyphIterator tempIterator(*glyphIterator, lookupFlags);
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le_uint32 delta = applyLookupTable(lookupTable, &tempIterator, fontInstance);
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le_int32 LookupProcessor::selectLookups(const FeatureTable *featureTable, LETag featureTag, le_int32 order)
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le_uint16 lookupCount = featureTable? SWAPW(featureTable->lookupCount) : 0;
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for (le_uint16 lookup = 0; lookup < lookupCount; lookup += 1) {
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le_uint16 lookupListIndex = SWAPW(featureTable->lookupListIndexArray[lookup]);
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lookupSelectArray[lookupListIndex] = featureTag;
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lookupOrderArray[order + lookup] = lookupListIndex;
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LookupProcessor::LookupProcessor(const char *baseAddress,
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Offset scriptListOffset, Offset featureListOffset, Offset lookupListOffset,
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LETag scriptTag, LETag languageTag, const LETag *featureOrder)
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: lookupListTable(NULL), featureListTable(NULL), lookupSelectArray(NULL),
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requiredFeatureTag(notSelected)
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const ScriptListTable *scriptListTable = NULL;
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const LangSysTable *langSysTable = NULL;
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le_uint16 featureCount = 0;
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le_uint16 lookupListCount = 0;
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le_uint16 requiredFeatureIndex;
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if (scriptListOffset != 0) {
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scriptListTable = (const ScriptListTable *) (baseAddress + scriptListOffset);
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langSysTable = scriptListTable->findLanguage(scriptTag, languageTag);
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if (langSysTable != 0) {
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featureCount = SWAPW(langSysTable->featureCount);
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if (featureListOffset != 0) {
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featureListTable = (const FeatureListTable *) (baseAddress + featureListOffset);
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if (lookupListOffset != 0) {
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lookupListTable = (const LookupListTable *) (baseAddress + lookupListOffset);
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lookupListCount = SWAPW(lookupListTable->lookupCount);
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if (langSysTable == NULL || featureListTable == NULL || lookupListTable == NULL ||
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featureCount == 0 || lookupListCount == 0) {
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requiredFeatureIndex = SWAPW(langSysTable->reqFeatureIndex);
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lookupSelectArray = new LETag[lookupListCount];
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for (int i = 0; i < lookupListCount; i += 1) {
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lookupSelectArray[i] = notSelected;
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le_int32 count, order = 0;
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const FeatureTable *featureTable = 0;
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lookupOrderArray = new le_uint16[lookupListCount];
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if (requiredFeatureIndex != 0xFFFF) {
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featureTable = featureListTable->getFeatureTable(requiredFeatureIndex, &featureTag);
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order += selectLookups(featureTable, defaultFeature, order);
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if (featureOrder != NULL) {
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OpenTypeUtilities::sort(lookupOrderArray, order);
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for (le_int32 tag = 0; featureOrder[tag] != emptyTag; tag += 1) {
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featureTag = featureOrder[tag];
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featureTable = featureListTable->getFeatureTable(featureTag);
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count = selectLookups(featureTable, featureTag, order);
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OpenTypeUtilities::sort(&lookupOrderArray[order], count);
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for (le_uint16 feature = 0; feature < featureCount; feature += 1) {
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le_uint16 featureIndex = SWAPW(langSysTable->featureIndexArray[feature]);
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featureTable = featureListTable->getFeatureTable(featureIndex, &featureTag);
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count = selectLookups(featureTable, featureTag, order);
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OpenTypeUtilities::sort(lookupOrderArray, order);
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lookupOrderCount = order;
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LookupProcessor::LookupProcessor()
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LookupProcessor::~LookupProcessor()
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delete[] lookupOrderArray;
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delete[] lookupSelectArray;