312 lines
10 KiB
C++
312 lines
10 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 1998-2011 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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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 "ICUFeatures.h"
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#include "Lookups.h"
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#include "ScriptAndLanguage.h"
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#include "GlyphDefinitionTables.h"
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#include "GlyphIterator.h"
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#include "LookupProcessor.h"
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#include "LEGlyphStorage.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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le_uint32 LookupProcessor::applyLookupTable(const LookupTable *lookupTable, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance, LEErrorCode& success) const
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{
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if (LE_FAILURE(success)) {
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return 0;
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}
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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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le_uint32 delta;
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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, success);
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if (delta > 0 && LE_FAILURE(success)) {
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return 1;
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}
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glyphIterator->setCurrStreamPosition(startPosition);
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}
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return 1;
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}
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le_int32 LookupProcessor::process(LEGlyphStorage &glyphStorage, GlyphPositionAdjustments *glyphPositionAdjustments,
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le_bool rightToLeft, const GlyphDefinitionTableHeader *glyphDefinitionTableHeader,
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const LEFontInstance *fontInstance, LEErrorCode& success) const
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{
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if (LE_FAILURE(success)) {
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return 0;
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}
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le_int32 glyphCount = glyphStorage.getGlyphCount();
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if (lookupSelectArray == NULL) {
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return glyphCount;
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}
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GlyphIterator glyphIterator(glyphStorage, glyphPositionAdjustments,
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rightToLeft, 0, 0, glyphDefinitionTableHeader);
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le_int32 newGlyphCount = glyphCount;
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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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FeatureMask selectMask = lookupSelectArray[lookup];
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if (selectMask != 0) {
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const LookupTable *lookupTable = lookupListTable->getLookupTable(lookup);
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if (!lookupTable) {
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continue;
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}
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le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
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glyphIterator.reset(lookupFlags, selectMask);
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while (glyphIterator.findFeatureTag()) {
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applyLookupTable(lookupTable, &glyphIterator, fontInstance, success);
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if (LE_FAILURE(success)) {
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return 0;
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}
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}
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newGlyphCount = glyphIterator.applyInsertions();
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}
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}
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return newGlyphCount;
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}
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le_uint32 LookupProcessor::applySingleLookup(le_uint16 lookupTableIndex, GlyphIterator *glyphIterator,
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const LEFontInstance *fontInstance, LEErrorCode& success) const
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{
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if (LE_FAILURE(success)) {
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return 0;
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}
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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, success);
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return delta;
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}
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le_int32 LookupProcessor::selectLookups(const FeatureTable *featureTable, FeatureMask featureMask, le_int32 order)
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{
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le_uint16 lookupCount = featureTable? SWAPW(featureTable->lookupCount) : 0;
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le_int32 store = order;
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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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if (lookupListIndex >= lookupSelectCount) {
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continue;
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}
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lookupSelectArray[lookupListIndex] |= featureMask;
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lookupOrderArray[store++] = lookupListIndex;
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}
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return store - order;
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}
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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 FeatureMap *featureMap, le_int32 featureMapCount, le_bool orderFeatures,
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LEErrorCode& success)
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: lookupListTable(NULL), featureListTable(NULL), lookupSelectArray(NULL), lookupSelectCount(0),
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lookupOrderArray(NULL), lookupOrderCount(0)
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{
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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 (LE_FAILURE(success)) {
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return;
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}
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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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}
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}
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if (featureListOffset != 0) {
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featureListTable = (const FeatureListTable *) (baseAddress + featureListOffset);
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}
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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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}
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if (langSysTable == NULL || featureListTable == NULL || lookupListTable == NULL ||
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featureCount == 0 || lookupListCount == 0) {
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return;
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}
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requiredFeatureIndex = SWAPW(langSysTable->reqFeatureIndex);
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lookupSelectArray = LE_NEW_ARRAY(FeatureMask, lookupListCount);
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if (lookupSelectArray == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return;
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}
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for (int i = 0; i < lookupListCount; i += 1) {
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lookupSelectArray[i] = 0;
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}
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lookupSelectCount = lookupListCount;
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le_int32 count, order = 0;
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le_int32 featureReferences = 0;
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const FeatureTable *featureTable = NULL;
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LETag featureTag;
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const FeatureTable *requiredFeatureTable = NULL;
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LETag requiredFeatureTag = 0x00000000U;
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// Count the total number of lookups referenced by all features. This will
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// be the maximum number of entries in the lookupOrderArray. We can't use
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// lookupListCount because some lookups might be referenced by more than
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// one feature.
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for (le_int32 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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if (!featureTable) {
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continue;
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}
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featureReferences += SWAPW(featureTable->lookupCount);
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}
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if (requiredFeatureIndex != 0xFFFF) {
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requiredFeatureTable = featureListTable->getFeatureTable(requiredFeatureIndex, &requiredFeatureTag);
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featureReferences += SWAPW(featureTable->lookupCount);
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}
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lookupOrderArray = LE_NEW_ARRAY(le_uint16, featureReferences);
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if (lookupOrderArray == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return;
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}
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for (le_int32 f = 0; f < featureMapCount; f += 1) {
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FeatureMap fm = featureMap[f];
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count = 0;
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// If this is the required feature, add its lookups
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if (requiredFeatureTag == fm.tag) {
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count += selectLookups(requiredFeatureTable, fm.mask, order);
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}
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if (orderFeatures) {
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// If we added lookups from the required feature, sort them
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if (count > 1) {
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OpenTypeUtilities::sort(lookupOrderArray, order);
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}
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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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// don't add the required feature to the list more than once...
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// TODO: Do we need this check? (Spec. says required feature won't be in feature list...)
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if (featureIndex == requiredFeatureIndex) {
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continue;
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}
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featureTable = featureListTable->getFeatureTable(featureIndex, &featureTag);
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if (featureTag == fm.tag) {
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count += selectLookups(featureTable, fm.mask, order + count);
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}
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}
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if (count > 1) {
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OpenTypeUtilities::sort(&lookupOrderArray[order], count);
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}
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order += count;
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} else {
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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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// don't add the required feature to the list more than once...
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// NOTE: This check is commented out because the spec. says that
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// the required feature won't be in the feature list, and because
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// any duplicate entries will be removed below.
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#if 0
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if (featureIndex == requiredFeatureIndex) {
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continue;
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}
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#endif
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featureTable = featureListTable->getFeatureTable(featureIndex, &featureTag);
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if (featureTag == fm.tag) {
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order += selectLookups(featureTable, fm.mask, order);
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}
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}
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}
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}
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if (!orderFeatures && (order > 1)) {
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OpenTypeUtilities::sort(lookupOrderArray, order);
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// If there's no specified feature order,
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// we will apply the lookups in the order
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// that they're in the font. If a particular
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// lookup may be referenced by more than one feature,
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// it will apprear in the lookupOrderArray more than
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// once, so remove any duplicate entries in the sorted array.
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le_int32 out = 1;
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for (le_int32 in = 1; in < order; in += 1) {
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if (lookupOrderArray[out - 1] != lookupOrderArray[in]) {
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if (out != in) {
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lookupOrderArray[out] = lookupOrderArray[in];
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}
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out += 1;
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}
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}
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order = out;
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}
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lookupOrderCount = order;
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}
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LookupProcessor::LookupProcessor()
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{
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lookupOrderArray = NULL;
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lookupSelectArray = NULL;
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}
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LookupProcessor::~LookupProcessor()
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{
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LE_DELETE_ARRAY(lookupOrderArray);
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LE_DELETE_ARRAY(lookupSelectArray);
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}
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U_NAMESPACE_END
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