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