146 lines
5.3 KiB
C++
146 lines
5.3 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. and others 1998-2013 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "MorphTables.h"
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#include "StateTables.h"
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#include "MorphStateTables.h"
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#include "SubtableProcessor2.h"
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#include "StateTableProcessor2.h"
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#include "ContextualGlyphSubstProc2.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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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor2)
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ContextualGlyphSubstitutionProcessor2::ContextualGlyphSubstitutionProcessor2(
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const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
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: StateTableProcessor2(morphSubtableHeader, success), contextualGlyphHeader(morphSubtableHeader, success)
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{
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if(LE_FAILURE(success)) return;
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le_uint32 perGlyphTableOffset = SWAPL(contextualGlyphHeader->perGlyphTableOffset);
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perGlyphTable = LEReferenceToArrayOf<le_uint32> (stHeader, success, perGlyphTableOffset, LE_UNBOUNDED_ARRAY);
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entryTable = LEReferenceToArrayOf<ContextualGlyphStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
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}
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ContextualGlyphSubstitutionProcessor2::~ContextualGlyphSubstitutionProcessor2()
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{
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}
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void ContextualGlyphSubstitutionProcessor2::beginStateTable()
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{
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markGlyph = 0;
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}
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le_uint16 ContextualGlyphSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph,
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EntryTableIndex2 index, LEErrorCode &success)
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{
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if(LE_FAILURE(success)) return 0;
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const ContextualGlyphStateEntry2 *entry = entryTable.getAlias(index, success);
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if(LE_FAILURE(success)) return 0;
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le_uint16 newState = SWAPW(entry->newStateIndex);
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le_uint16 flags = SWAPW(entry->flags);
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le_int16 markIndex = SWAPW(entry->markIndex);
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le_int16 currIndex = SWAPW(entry->currIndex);
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if (markIndex != -1) {
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le_uint32 offset = SWAPL(perGlyphTable(markIndex, success));
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LEGlyphID mGlyph = glyphStorage[markGlyph];
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TTGlyphID newGlyph = lookup(offset, mGlyph, success);
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glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
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}
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if (currIndex != -1) {
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le_uint32 offset = SWAPL(perGlyphTable(currIndex, success));
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LEGlyphID thisGlyph = glyphStorage[currGlyph];
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TTGlyphID newGlyph = lookup(offset, thisGlyph, success);
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glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);
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}
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if (flags & cgsSetMark) {
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markGlyph = currGlyph;
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}
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if (!(flags & cgsDontAdvance)) {
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currGlyph += dir;
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}
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return newState;
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}
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TTGlyphID ContextualGlyphSubstitutionProcessor2::lookup(le_uint32 offset, LEGlyphID gid, LEErrorCode &success)
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{
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TTGlyphID newGlyph = 0xFFFF;
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if(LE_FAILURE(success)) return newGlyph;
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LEReferenceTo<LookupTable> lookupTable(perGlyphTable, success, offset);
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if(LE_FAILURE(success)) return newGlyph;
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le_int16 format = SWAPW(lookupTable->format);
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switch (format) {
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case ltfSimpleArray: {
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#ifdef TEST_FORMAT
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// Disabled pending for design review
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LEReferenceTo<SimpleArrayLookupTable> lookupTable0(lookupTable, success);
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LEReferenceToArrayOf<LookupValue> valueArray(lookupTable0, success, &lookupTable0->valueArray[0], LE_UNBOUNDED_ARRAY);
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if(LE_FAILURE(success)) return newGlyph;
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TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
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newGlyph = SWAPW(lookupTable0->valueArray(glyphCode, success));
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#endif
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break;
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}
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case ltfSegmentSingle: {
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#ifdef TEST_FORMAT
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// Disabled pending for design review
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LEReferenceTo<SegmentSingleLookupTable> lookupTable2 = (SegmentSingleLookupTable *) lookupTable;
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const LookupSegment *segment = lookupTable2->lookupSegment(lookupTable2->segments, gid);
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if (segment != NULL) {
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newGlyph = SWAPW(segment->value);
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}
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#endif
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break;
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}
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case ltfSegmentArray: {
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//printf("Context Lookup Table Format4: specific interpretation needed!\n");
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break;
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}
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case ltfSingleTable:
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{
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#ifdef TEST_FORMAT
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// Disabled pending for design review
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LEReferenceTo<SingleTableLookupTable> lookupTable6 = (SingleTableLookupTable *) lookupTable;
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const LEReferenceTo<LookupSingle> segment = lookupTable6->lookupSingle(lookupTable6->entries, gid);
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if (segment != NULL) {
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newGlyph = SWAPW(segment->value);
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}
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#endif
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break;
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}
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case ltfTrimmedArray: {
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LEReferenceTo<TrimmedArrayLookupTable> lookupTable8(lookupTable, success);
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if (LE_FAILURE(success)) return newGlyph;
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TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);
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TTGlyphID glyphCount = SWAPW(lookupTable8->glyphCount);
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TTGlyphID lastGlyph = firstGlyph + glyphCount;
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TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
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if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
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LEReferenceToArrayOf<LookupValue> valueArray(lookupTable8, success, &lookupTable8->valueArray[0], glyphCount);
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newGlyph = SWAPW(valueArray(glyphCode - firstGlyph, success));
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}
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}
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default:
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break;
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}
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return newGlyph;
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}
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void ContextualGlyphSubstitutionProcessor2::endStateTable()
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{
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}
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U_NAMESPACE_END
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