144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 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 "SubtableProcessor.h"
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#include "StateTableProcessor.h"
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#include "LigatureSubstProc.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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#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
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#define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))
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#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor)
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LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
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: StateTableProcessor(morphSubtableHeader, success), ligatureSubstitutionHeader(morphSubtableHeader, success)
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{
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if(LE_FAILURE(success)) return;
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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 = LEReferenceToArrayOf<LigatureSubstitutionStateEntry>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
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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(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
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{
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LEErrorCode success = LE_NO_ERROR;
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const LigatureSubstitutionStateEntry *entry = entryTable.getAlias(index, success);
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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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} else if ( m == -1) {
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// bad font- skip this glyph.
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currGlyph++;
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return newState;
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}
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ByteOffset actionOffset = flags & lsfActionOffsetMask;
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if (actionOffset != 0) {
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LEReferenceTo<LigatureActionEntry> ap(stHeader, success, 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.getAlias());
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ap.addObject(success); // 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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LEReferenceToArrayOf<le_int16> offsetTable(stHeader, success, 2 * SignExtend(offset, lafComponentOffsetMask), LE_UNBOUNDED_ARRAY);
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if(LE_FAILURE(success)) {
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currGlyph++;
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LE_DEBUG_BAD_FONT("off end of ligature substitution header");
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return newState; // get out! bad font
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}
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if(componentGlyph > (le_uint32)glyphStorage.getGlyphCount()) {
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LE_DEBUG_BAD_FONT("preposterous componentGlyph");
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currGlyph++;
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return newState; // get out! bad font
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}
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i += SWAPW(offsetTable.getObject(LE_GET_GLYPH(glyphStorage[componentGlyph]), success));
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if (action & (lafLast | lafStore)) {
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LEReferenceTo<TTGlyphID> ligatureOffset(stHeader, success, i);
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TTGlyphID ligatureGlyph = SWAPW(*ligatureOffset.getAlias());
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glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph);
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if(mm==nComponents) {
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LE_DEBUG_BAD_FONT("exceeded nComponents");
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mm--; // don't overrun the stack.
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}
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stack[++mm] = componentGlyph;
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i = 0;
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} else {
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glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF);
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}
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}
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#if LE_ASSERT_BAD_FONT
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if(m<0) {
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LE_DEBUG_BAD_FONT("m<0")
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}
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#endif
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} while (!(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items
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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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