115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
/*
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* @(#)GlyphSubstLookupProc.cpp 1.6 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - 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 "LigatureSubstProc.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
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#define SignBit(m) ((ExtendedComplement(m) >> 1) & (m))
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#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
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LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)
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: StateTableProcessor(morphSubtableHeader)
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{
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ligatureSubstitutionHeader = (const LigatureSubstitutionHeader *) morphSubtableHeader;
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ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset);
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componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset);
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ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset);
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entryTable = (const LigatureSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
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}
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LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor()
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{
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}
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void LigatureSubstitutionProcessor::beginStateTable()
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{
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m = -1;
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}
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ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphID *glyphs, le_int32 *charIndices, le_int32 &currGlyph, le_int32 glyphCount, EntryTableIndex index)
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{
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const LigatureSubstitutionStateEntry *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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if (flags & lsfSetComponent) {
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if (++m >= nComponents) {
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m = 0;
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}
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componentStack[m] = currGlyph;
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}
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ByteOffset actionOffset = flags & lsfActionOffsetMask;
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if (actionOffset != 0) {
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const LigatureActionEntry *ap = (const LigatureActionEntry *) ((char *) &ligatureSubstitutionHeader->stHeader + actionOffset);
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LigatureActionEntry action;
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le_int32 offset, i = 0;
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le_int32 stack[nComponents];
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le_int16 mm = -1;
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do {
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le_uint32 componentGlyph = componentStack[m--];
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action = SWAPL(*ap++);
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if (m < 0) {
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m = nComponents - 1;
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}
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offset = action & lafComponentOffsetMask;
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if (offset != 0) {
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const le_int16 *offsetTable = (const le_int16 *)((char *) &ligatureSubstitutionHeader->stHeader + 2 * SignExtend(offset, lafComponentOffsetMask));
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i += SWAPW(offsetTable[glyphs[componentGlyph]]);
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if (action & (lafLast | lafStore)) {
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const le_int16 *ligatureOffset = (const le_int16 *) ((char *) &ligatureSubstitutionHeader->stHeader + i);
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glyphs[componentGlyph] = SWAPW(*ligatureOffset);
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stack[++mm] = componentGlyph;
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i = 0;
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} else {
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glyphs[componentGlyph] = 0xFFFF;
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}
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}
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} while (!(action & lafLast));
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while (mm >= 0) {
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if (++m >= nComponents) {
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m = 0;
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}
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componentStack[m] = stack[mm--];
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}
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}
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if (!(flags & lsfDontAdvance)) {
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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 LigatureSubstitutionProcessor::endStateTable()
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{
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}
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U_NAMESPACE_END
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