1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/LookupProcessor.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,257 @@
1.4 +/*
1.5 + *
1.6 + * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
1.7 + *
1.8 + */
1.9 +
1.10 +#include "LETypes.h"
1.11 +#include "OpenTypeUtilities.h"
1.12 +#include "LEFontInstance.h"
1.13 +#include "OpenTypeTables.h"
1.14 +#include "Features.h"
1.15 +#include "Lookups.h"
1.16 +#include "ScriptAndLanguage.h"
1.17 +#include "GlyphDefinitionTables.h"
1.18 +#include "GlyphIterator.h"
1.19 +#include "LookupProcessor.h"
1.20 +#include "LEGlyphStorage.h"
1.21 +#include "LESwaps.h"
1.22 +
1.23 +U_NAMESPACE_BEGIN
1.24 +
1.25 +const LETag LookupProcessor::notSelected = 0x00000000;
1.26 +const LETag LookupProcessor::defaultFeature = 0xFFFFFFFF;
1.27 +
1.28 +static const LETag emptyTag = 0x00000000;
1.29 +
1.30 +
1.31 +le_uint32 LookupProcessor::applyLookupTable(const LookupTable *lookupTable,
1.32 + GlyphIterator *glyphIterator, const LEFontInstance *fontInstance,
1.33 + LEErrorCode& success) const
1.34 +{
1.35 + if (LE_FAILURE(success)) {
1.36 + return 0;
1.37 + }
1.38 +
1.39 + le_uint16 lookupType = SWAPW(lookupTable->lookupType);
1.40 + le_uint16 subtableCount = SWAPW(lookupTable->subTableCount);
1.41 + le_int32 startPosition = glyphIterator->getCurrStreamPosition();
1.42 + le_uint32 delta;
1.43 +
1.44 + for (le_uint16 subtable = 0; subtable < subtableCount; subtable += 1) {
1.45 + const LookupSubtable *lookupSubtable = lookupTable->getLookupSubtable(subtable);
1.46 +
1.47 + delta = applySubtable(lookupSubtable, lookupType, glyphIterator,
1.48 + fontInstance, success);
1.49 +
1.50 + if (delta > 0 || LE_FAILURE(success)) {
1.51 + return 1;
1.52 + }
1.53 +
1.54 + glyphIterator->setCurrStreamPosition(startPosition);
1.55 + }
1.56 +
1.57 + return 1;
1.58 +}
1.59 +
1.60 +le_int32 LookupProcessor::process(LEGlyphStorage &glyphStorage, GlyphPositionAdjustments *glyphPositionAdjustments,
1.61 + le_bool rightToLeft, const GlyphDefinitionTableHeader *glyphDefinitionTableHeader,
1.62 + const LEFontInstance *fontInstance, LEErrorCode& success) const
1.63 +{
1.64 + if (LE_FAILURE(success)) {
1.65 + return 0;
1.66 + }
1.67 +
1.68 + le_int32 glyphCount = glyphStorage.getGlyphCount();
1.69 +
1.70 + if (lookupSelectArray == NULL) {
1.71 + return glyphCount;
1.72 + }
1.73 +
1.74 + GlyphIterator glyphIterator(glyphStorage, glyphPositionAdjustments,
1.75 + rightToLeft, 0, 0, glyphDefinitionTableHeader);
1.76 + le_int32 newGlyphCount = glyphCount;
1.77 +
1.78 + for (le_uint16 order = 0; order < lookupOrderCount; order += 1) {
1.79 + le_uint16 lookup = lookupOrderArray[order];
1.80 + LETag selectTag = lookupSelectArray[lookup];
1.81 +
1.82 + if (selectTag != notSelected) {
1.83 + const LookupTable *lookupTable = lookupListTable->getLookupTable(lookup);
1.84 + le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
1.85 +
1.86 + glyphIterator.reset(lookupFlags, selectTag);
1.87 +
1.88 + while (glyphIterator.findFeatureTag()) {
1.89 + le_uint32 delta = 1;
1.90 +
1.91 + while (glyphIterator.next(delta)) {
1.92 + delta = applyLookupTable(lookupTable, &glyphIterator, fontInstance, success);
1.93 + if (LE_FAILURE(success)) {
1.94 + return 0;
1.95 + }
1.96 + }
1.97 + }
1.98 +
1.99 + newGlyphCount = glyphIterator.applyInsertions();
1.100 + }
1.101 + }
1.102 +
1.103 + return newGlyphCount;
1.104 +}
1.105 +
1.106 +le_uint32 LookupProcessor::applySingleLookup(le_uint16 lookupTableIndex, GlyphIterator *glyphIterator,
1.107 + const LEFontInstance *fontInstance, LEErrorCode& success) const
1.108 +{
1.109 + if (LE_FAILURE(success)) {
1.110 + return 0;
1.111 + }
1.112 +
1.113 + const LookupTable *lookupTable = lookupListTable->getLookupTable(lookupTableIndex);
1.114 + le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
1.115 + GlyphIterator tempIterator(*glyphIterator, lookupFlags);
1.116 + le_uint32 delta = applyLookupTable(lookupTable, &tempIterator, fontInstance, success);
1.117 +
1.118 + return delta;
1.119 +}
1.120 +
1.121 +le_int32 LookupProcessor::selectLookups(const FeatureTable *featureTable, LETag featureTag, le_int32 order)
1.122 +{
1.123 + le_uint16 lookupCount = featureTable? SWAPW(featureTable->lookupCount) : 0;
1.124 + le_int32 store = order;
1.125 +
1.126 + for (le_uint16 lookup = 0; lookup < lookupCount; lookup += 1) {
1.127 + le_uint16 lookupListIndex = SWAPW(featureTable->lookupListIndexArray[lookup]);
1.128 +
1.129 + if (lookupSelectArray[lookupListIndex] == notSelected) {
1.130 + lookupSelectArray[lookupListIndex] = featureTag;
1.131 + lookupOrderArray[store++] = lookupListIndex;
1.132 + }
1.133 + }
1.134 +
1.135 + return store - order;
1.136 +}
1.137 +
1.138 +LookupProcessor::LookupProcessor(const char *baseAddress,
1.139 + Offset scriptListOffset, Offset featureListOffset, Offset lookupListOffset,
1.140 + LETag scriptTag, LETag languageTag, const LETag *featureOrder)
1.141 + : lookupListTable(NULL), featureListTable(NULL), lookupSelectArray(NULL),
1.142 + requiredFeatureTag(notSelected), lookupOrderArray(NULL), lookupOrderCount(0)
1.143 +{
1.144 + const ScriptListTable *scriptListTable = NULL;
1.145 + const LangSysTable *langSysTable = NULL;
1.146 + le_uint16 featureCount = 0;
1.147 + le_uint16 lookupListCount = 0;
1.148 + le_uint16 requiredFeatureIndex;
1.149 +
1.150 + if (scriptListOffset != 0) {
1.151 + scriptListTable = (const ScriptListTable *) (baseAddress + scriptListOffset);
1.152 + langSysTable = scriptListTable->findLanguage(scriptTag, languageTag);
1.153 +
1.154 + if (langSysTable != 0) {
1.155 + featureCount = SWAPW(langSysTable->featureCount);
1.156 + }
1.157 + }
1.158 +
1.159 + if (featureListOffset != 0) {
1.160 + featureListTable = (const FeatureListTable *) (baseAddress + featureListOffset);
1.161 + }
1.162 +
1.163 + if (lookupListOffset != 0) {
1.164 + lookupListTable = (const LookupListTable *) (baseAddress + lookupListOffset);
1.165 + lookupListCount = SWAPW(lookupListTable->lookupCount);
1.166 + }
1.167 +
1.168 + if (langSysTable == NULL || featureListTable == NULL || lookupListTable == NULL ||
1.169 + featureCount == 0 || lookupListCount == 0) {
1.170 + return;
1.171 + }
1.172 +
1.173 + requiredFeatureIndex = SWAPW(langSysTable->reqFeatureIndex);
1.174 +
1.175 + lookupSelectArray = LE_NEW_ARRAY(LETag, lookupListCount);
1.176 + if (!lookupSelectArray)
1.177 + return;
1.178 +
1.179 + for (int i = 0; i < lookupListCount; i += 1) {
1.180 + lookupSelectArray[i] = notSelected;
1.181 + }
1.182 +
1.183 + le_int32 count, order = 0;
1.184 + const FeatureTable *featureTable = 0;
1.185 + LETag featureTag;
1.186 +
1.187 + lookupOrderArray = LE_NEW_ARRAY(le_uint16, lookupListCount);
1.188 + if (!lookupOrderArray)
1.189 + return;
1.190 +
1.191 + if (requiredFeatureIndex != 0xFFFF) {
1.192 + featureTable = featureListTable->getFeatureTable(requiredFeatureIndex, &featureTag);
1.193 + order += selectLookups(featureTable, defaultFeature, order);
1.194 + }
1.195 +
1.196 + if (featureOrder != NULL) {
1.197 + if (order > 1) {
1.198 + OpenTypeUtilities::sort(lookupOrderArray, order);
1.199 + }
1.200 +
1.201 + for (le_int32 tag = 0; featureOrder[tag] != emptyTag; tag += 1) {
1.202 + featureTag = featureOrder[tag];
1.203 + count = 0;
1.204 +
1.205 + for (le_uint16 feature = 0; feature < featureCount; feature += 1) {
1.206 + le_uint16 featureIndex = SWAPW(langSysTable->featureIndexArray[feature]);
1.207 +
1.208 + featureTable = featureListTable->getFeatureTable(featureIndex, &featureTag);
1.209 +
1.210 + if (featureTag == featureOrder[tag]) {
1.211 + count += selectLookups(featureTable, featureTag, order + count);
1.212 + }
1.213 + }
1.214 +
1.215 + if (count > 1) {
1.216 + OpenTypeUtilities::sort(&lookupOrderArray[order], count);
1.217 + }
1.218 +
1.219 + order += count;
1.220 + }
1.221 + } else {
1.222 + for (le_uint16 feature = 0; feature < featureCount; feature += 1) {
1.223 + le_uint16 featureIndex = SWAPW(langSysTable->featureIndexArray[feature]);
1.224 +
1.225 + // don't add the required feature to the list more than once...
1.226 + if (featureIndex == requiredFeatureIndex) {
1.227 + continue;
1.228 + }
1.229 +
1.230 + featureTable = featureListTable->getFeatureTable(featureIndex, &featureTag);
1.231 + count = selectLookups(featureTable, featureTag, order);
1.232 + order += count;
1.233 + }
1.234 +
1.235 + if (order > 1) {
1.236 + OpenTypeUtilities::sort(lookupOrderArray, order);
1.237 + }
1.238 + }
1.239 +
1.240 + lookupOrderCount = order;
1.241 +}
1.242 +
1.243 +LookupProcessor::LookupProcessor()
1.244 +{
1.245 + lookupOrderArray = 0;
1.246 + lookupSelectArray = 0;
1.247 +}
1.248 +
1.249 +le_bool LookupProcessor::isBogus()
1.250 +{
1.251 + return lookupSelectArray && lookupSelectArray? FALSE : TRUE;
1.252 +}
1.253 +
1.254 +LookupProcessor::~LookupProcessor()
1.255 +{
1.256 + LE_DELETE_ARRAY(lookupOrderArray);
1.257 + LE_DELETE_ARRAY(lookupSelectArray);
1.258 +}
1.259 +
1.260 +U_NAMESPACE_END