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