339 lines
12 KiB
C++
339 lines
12 KiB
C++
// Copyright (C) 2016 and later: Unicode, Inc. and others.
|
|
// License & terms of use: http://www.unicode.org/copyright.html
|
|
/*
|
|
*
|
|
* (C) Copyright IBM Corp. and others 1998-2015 - All Rights Reserved
|
|
*
|
|
*/
|
|
|
|
#include "LETypes.h"
|
|
#include "OpenTypeUtilities.h"
|
|
#include "LEFontInstance.h"
|
|
#include "OpenTypeTables.h"
|
|
#include "ICUFeatures.h"
|
|
#include "Lookups.h"
|
|
#include "ScriptAndLanguage.h"
|
|
#include "GlyphDefinitionTables.h"
|
|
#include "GlyphIterator.h"
|
|
#include "LookupProcessor.h"
|
|
#include "LEGlyphStorage.h"
|
|
#include "LESwaps.h"
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
le_uint32 LookupProcessor::applyLookupTable(const LEReferenceTo<LookupTable> &lookupTable, GlyphIterator *glyphIterator,
|
|
const LEFontInstance *fontInstance, LEErrorCode& success) const
|
|
{
|
|
if (LE_FAILURE(success)) {
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
LEReferenceTo<LookupSubtable> lookupSubtable = lookupTable->getLookupSubtable(lookupTable, subtable, success);
|
|
|
|
delta = applySubtable(lookupSubtable, lookupType, glyphIterator, fontInstance, success);
|
|
|
|
if (delta > 0 && LE_FAILURE(success)) {
|
|
return 1;
|
|
}
|
|
|
|
glyphIterator->setCurrStreamPosition(startPosition);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
le_int32 LookupProcessor::process(LEGlyphStorage &glyphStorage, GlyphPositionAdjustments *glyphPositionAdjustments,
|
|
le_bool rightToLeft, const LEReferenceTo<GlyphDefinitionTableHeader> &glyphDefinitionTableHeader,
|
|
const LEFontInstance *fontInstance, LEErrorCode& success) const
|
|
{
|
|
if (LE_FAILURE(success)) {
|
|
return 0;
|
|
}
|
|
|
|
le_int32 glyphCount = glyphStorage.getGlyphCount();
|
|
|
|
if (lookupSelectArray == NULL) {
|
|
return glyphCount;
|
|
}
|
|
|
|
GlyphIterator glyphIterator(glyphStorage, glyphPositionAdjustments,
|
|
rightToLeft, 0, 0, glyphDefinitionTableHeader);
|
|
le_int32 newGlyphCount = glyphCount;
|
|
|
|
for (le_uint16 order = 0; order < lookupOrderCount && LE_SUCCESS(success); order += 1) {
|
|
le_uint16 lookup = lookupOrderArray[order];
|
|
FeatureMask selectMask = lookupSelectArray[lookup];
|
|
|
|
if (selectMask != 0) {
|
|
const LEReferenceTo<LookupTable> lookupTable = lookupListTable->getLookupTable(lookupListTable, lookup, success);
|
|
if (!lookupTable.isValid() ||LE_FAILURE(success) ) {
|
|
continue;
|
|
}
|
|
le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
|
|
|
|
glyphIterator.reset(lookupFlags, selectMask);
|
|
|
|
while (glyphIterator.findFeatureTag()) {
|
|
applyLookupTable(lookupTable, &glyphIterator, fontInstance, success);
|
|
if (LE_FAILURE(success)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
newGlyphCount = glyphIterator.applyInsertions();
|
|
}
|
|
}
|
|
|
|
return newGlyphCount;
|
|
}
|
|
|
|
le_uint32 LookupProcessor::applySingleLookup(le_uint16 lookupTableIndex, GlyphIterator *glyphIterator,
|
|
const LEFontInstance *fontInstance, LEErrorCode& success) const
|
|
{
|
|
if (LE_FAILURE(success)) {
|
|
return 0;
|
|
}
|
|
|
|
const LEReferenceTo<LookupTable> lookupTable = lookupListTable->getLookupTable(lookupListTable, lookupTableIndex, success);
|
|
if (!lookupTable.isValid()) {
|
|
success = LE_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
|
|
GlyphIterator tempIterator(*glyphIterator, lookupFlags);
|
|
le_uint32 delta = applyLookupTable(lookupTable, &tempIterator, fontInstance, success);
|
|
|
|
return delta;
|
|
}
|
|
|
|
le_int32 LookupProcessor::selectLookups(const LEReferenceTo<FeatureTable> &featureTable, FeatureMask featureMask, le_int32 order, LEErrorCode &success)
|
|
{
|
|
le_uint16 lookupCount = featureTable.isValid()? SWAPW(featureTable->lookupCount) : 0;
|
|
le_uint32 store = (le_uint32)order;
|
|
|
|
LEReferenceToArrayOf<le_uint16> lookupListIndexArray(featureTable, success, featureTable->lookupListIndexArray, lookupCount);
|
|
|
|
for (le_uint16 lookup = 0; LE_SUCCESS(success) && lookup < lookupCount; lookup += 1) {
|
|
le_uint16 lookupListIndex = SWAPW(lookupListIndexArray.getObject(lookup,success));
|
|
if (lookupListIndex >= lookupSelectCount) {
|
|
continue;
|
|
}
|
|
if (store >= lookupOrderCount) {
|
|
continue;
|
|
}
|
|
|
|
lookupSelectArray[lookupListIndex] |= featureMask;
|
|
lookupOrderArray[store++] = lookupListIndex;
|
|
}
|
|
|
|
return store - order;
|
|
}
|
|
|
|
LookupProcessor::LookupProcessor(const LETableReference &baseAddress,
|
|
Offset scriptListOffset, Offset featureListOffset, Offset lookupListOffset,
|
|
LETag scriptTag, LETag languageTag, const FeatureMap *featureMap, le_int32 featureMapCount, le_bool orderFeatures,
|
|
LEErrorCode& success)
|
|
: lookupListTable(), featureListTable(), lookupSelectArray(NULL), lookupSelectCount(0),
|
|
lookupOrderArray(NULL), lookupOrderCount(0), fReference(baseAddress)
|
|
{
|
|
LEReferenceTo<ScriptListTable> scriptListTable;
|
|
LEReferenceTo<LangSysTable> langSysTable;
|
|
le_uint16 featureCount = 0;
|
|
le_uint16 lookupListCount = 0;
|
|
le_uint16 requiredFeatureIndex;
|
|
|
|
if (LE_FAILURE(success)) {
|
|
return;
|
|
}
|
|
|
|
if (scriptListOffset != 0) {
|
|
scriptListTable = LEReferenceTo<ScriptListTable>(baseAddress, success, scriptListOffset);
|
|
langSysTable = scriptListTable->findLanguage(scriptListTable, scriptTag, languageTag, success);
|
|
|
|
if (langSysTable.isValid() && LE_SUCCESS(success)) {
|
|
featureCount = SWAPW(langSysTable->featureCount);
|
|
}
|
|
}
|
|
|
|
if (featureListOffset != 0) {
|
|
featureListTable = LEReferenceTo<FeatureListTable>(baseAddress, success, featureListOffset);
|
|
}
|
|
|
|
if (lookupListOffset != 0) {
|
|
lookupListTable = LEReferenceTo<LookupListTable>(baseAddress,success, lookupListOffset);
|
|
if(LE_SUCCESS(success) && lookupListTable.isValid()) {
|
|
lookupListCount = SWAPW(lookupListTable->lookupCount);
|
|
}
|
|
}
|
|
|
|
if (langSysTable.isEmpty() || featureListTable.isEmpty() || lookupListTable.isEmpty() ||
|
|
featureCount == 0 || lookupListCount == 0) {
|
|
return;
|
|
}
|
|
|
|
if(langSysTable.isValid()) {
|
|
requiredFeatureIndex = SWAPW(langSysTable->reqFeatureIndex);
|
|
}
|
|
|
|
lookupSelectArray = LE_NEW_ARRAY(FeatureMask, lookupListCount);
|
|
if (lookupSelectArray == NULL) {
|
|
success = LE_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
|
|
for (int i = 0; i < lookupListCount; i += 1) {
|
|
lookupSelectArray[i] = 0;
|
|
}
|
|
lookupSelectCount = lookupListCount;
|
|
|
|
le_int32 count, order = 0;
|
|
le_uint32 featureReferences = 0;
|
|
LEReferenceTo<FeatureTable> featureTable;
|
|
LETag featureTag;
|
|
|
|
LEReferenceTo<FeatureTable> requiredFeatureTable;
|
|
LETag requiredFeatureTag = 0x00000000U;
|
|
|
|
// Count the total number of lookups referenced by all features. This will
|
|
// be the maximum number of entries in the lookupOrderArray. We can't use
|
|
// lookupListCount because some lookups might be referenced by more than
|
|
// one feature.
|
|
if(featureListTable.isValid() && LE_SUCCESS(success)) {
|
|
LEReferenceToArrayOf<le_uint16> featureIndexArray(langSysTable, success, langSysTable->featureIndexArray, featureCount);
|
|
|
|
for (le_uint32 feature = 0; LE_SUCCESS(success)&&(feature < featureCount); feature += 1) {
|
|
le_uint16 featureIndex = SWAPW(featureIndexArray.getObject(feature, success));
|
|
|
|
featureTable = featureListTable->getFeatureTable(featureListTable, featureIndex, &featureTag, success);
|
|
if (!featureTable.isValid() || LE_FAILURE(success)) {
|
|
continue;
|
|
}
|
|
featureReferences += SWAPW(featureTable->lookupCount);
|
|
}
|
|
}
|
|
|
|
if (!featureTable.isValid() || LE_FAILURE(success)) {
|
|
success = LE_INTERNAL_ERROR;
|
|
return;
|
|
}
|
|
|
|
if (requiredFeatureIndex != 0xFFFF) {
|
|
requiredFeatureTable = featureListTable->getFeatureTable(featureListTable, requiredFeatureIndex, &requiredFeatureTag, success);
|
|
featureReferences += SWAPW(requiredFeatureTable->lookupCount);
|
|
}
|
|
|
|
lookupOrderArray = LE_NEW_ARRAY(le_uint16, featureReferences);
|
|
if (lookupOrderArray == NULL) {
|
|
success = LE_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
lookupOrderCount = featureReferences;
|
|
|
|
for (le_int32 f = 0; f < featureMapCount; f += 1) {
|
|
FeatureMap fm = featureMap[f];
|
|
count = 0;
|
|
|
|
// If this is the required feature, add its lookups
|
|
if (requiredFeatureTag == fm.tag) {
|
|
count += selectLookups(requiredFeatureTable, fm.mask, order, success);
|
|
}
|
|
|
|
if (orderFeatures) {
|
|
// If we added lookups from the required feature, sort them
|
|
if (count > 1) {
|
|
OpenTypeUtilities::sort(lookupOrderArray, order);
|
|
}
|
|
|
|
for (le_uint16 feature = 0; feature < featureCount; feature += 1) {
|
|
LEReferenceToArrayOf<le_uint16> featureIndexArray(langSysTable, success, langSysTable->featureIndexArray, featureCount);
|
|
le_uint16 featureIndex = SWAPW(featureIndexArray.getObject(feature,success));
|
|
|
|
// don't add the required feature to the list more than once...
|
|
// TODO: Do we need this check? (Spec. says required feature won't be in feature list...)
|
|
if (featureIndex == requiredFeatureIndex) {
|
|
continue;
|
|
}
|
|
|
|
featureTable = featureListTable->getFeatureTable(featureListTable, featureIndex, &featureTag, success);
|
|
|
|
if (featureTag == fm.tag) {
|
|
count += selectLookups(featureTable, fm.mask, order + count, success);
|
|
}
|
|
}
|
|
|
|
if (count > 1) {
|
|
OpenTypeUtilities::sort(&lookupOrderArray[order], count);
|
|
}
|
|
|
|
order += count;
|
|
} else if(langSysTable.isValid()) {
|
|
LEReferenceToArrayOf<le_uint16> featureIndexArray(langSysTable, success, langSysTable->featureIndexArray, featureCount);
|
|
for (le_uint16 feature = 0; LE_SUCCESS(success)&& (feature < featureCount); feature += 1) {
|
|
le_uint16 featureIndex = SWAPW(featureIndexArray.getObject(feature,success));
|
|
|
|
// don't add the required feature to the list more than once...
|
|
// NOTE: This check is commented out because the spec. says that
|
|
// the required feature won't be in the feature list, and because
|
|
// any duplicate entries will be removed below.
|
|
#if 0
|
|
if (featureIndex == requiredFeatureIndex) {
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
featureTable = featureListTable->getFeatureTable(featureListTable, featureIndex, &featureTag, success);
|
|
|
|
if (featureTag == fm.tag) {
|
|
order += selectLookups(featureTable, fm.mask, order, success);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!orderFeatures && (order > 1)) {
|
|
OpenTypeUtilities::sort(lookupOrderArray, order);
|
|
|
|
// If there's no specified feature order,
|
|
// we will apply the lookups in the order
|
|
// that they're in the font. If a particular
|
|
// lookup may be referenced by more than one feature,
|
|
// it will apprear in the lookupOrderArray more than
|
|
// once, so remove any duplicate entries in the sorted array.
|
|
le_int32 out = 1;
|
|
|
|
for (le_int32 in = 1; in < order; in += 1) {
|
|
if (lookupOrderArray[out - 1] != lookupOrderArray[in]) {
|
|
if (out != in) {
|
|
lookupOrderArray[out] = lookupOrderArray[in];
|
|
}
|
|
|
|
out += 1;
|
|
}
|
|
}
|
|
|
|
order = out;
|
|
}
|
|
|
|
lookupOrderCount = order;
|
|
}
|
|
|
|
LookupProcessor::LookupProcessor()
|
|
{
|
|
lookupOrderArray = NULL;
|
|
lookupSelectArray = NULL;
|
|
}
|
|
|
|
LookupProcessor::~LookupProcessor()
|
|
{
|
|
LE_DELETE_ARRAY(lookupOrderArray);
|
|
LE_DELETE_ARRAY(lookupSelectArray);
|
|
}
|
|
|
|
U_NAMESPACE_END
|