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/*
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*
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* (C) Copyright IBM Corp. 1998-2004 - 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 "SubtableProcessor.h"
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#include "StateTableProcessor.h"
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#include "ContextualGlyphSubstProc.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(ContextualGlyphSubstitutionProcessor)
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ContextualGlyphSubstitutionProcessor::ContextualGlyphSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)
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: StateTableProcessor(morphSubtableHeader)
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{
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contextualGlyphSubstitutionHeader = (const ContextualGlyphSubstitutionHeader *) morphSubtableHeader;
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substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset);
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entryTable = (const ContextualGlyphSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
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}
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ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor()
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{
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}
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void ContextualGlyphSubstitutionProcessor::beginStateTable()
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{
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markGlyph = 0;
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}
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ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
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{
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const ContextualGlyphSubstitutionStateEntry *entry = &entryTable[index];
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ByteOffset newState = SWAPW(entry->newStateOffset);
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le_int16 flags = SWAPW(entry->flags);
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WordOffset markOffset = SWAPW(entry->markOffset);
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WordOffset currOffset = SWAPW(entry->currOffset);
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if (markOffset != 0) {
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const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + markOffset * 2);
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LEGlyphID mGlyph = glyphStorage[markGlyph];
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TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(mGlyph)]);
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glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
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}
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if (currOffset != 0) {
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const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + currOffset * 2);
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LEGlyphID thisGlyph = glyphStorage[currGlyph];
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TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(thisGlyph)]);
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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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// should handle reverse too!
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currGlyph += 1;
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}
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return newState;
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}
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void ContextualGlyphSubstitutionProcessor::endStateTable()
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{
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}
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U_NAMESPACE_END
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