146 lines
4.9 KiB
C++
146 lines
4.9 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 "LigatureSubstProc2.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(LigatureSubstitutionProcessor2)
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LigatureSubstitutionProcessor2::LigatureSubstitutionProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
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: StateTableProcessor2(morphSubtableHeader, success),
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ligActionOffset(0),
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ligatureSubstitutionHeader(morphSubtableHeader, success), componentOffset(0), ligatureOffset(0), entryTable()
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{
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if (LE_FAILURE(success)) return;
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ligActionOffset = SWAPL(ligatureSubstitutionHeader->ligActionOffset);
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componentOffset = SWAPL(ligatureSubstitutionHeader->componentOffset);
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ligatureOffset = SWAPL(ligatureSubstitutionHeader->ligatureOffset);
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entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
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}
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LigatureSubstitutionProcessor2::~LigatureSubstitutionProcessor2()
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{
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}
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void LigatureSubstitutionProcessor2::beginStateTable()
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{
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m = -1;
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}
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le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index, LEErrorCode &success)
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{
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const LigatureSubstitutionStateEntry2 *entry = entryTable.getAlias(index, success);
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if(LE_FAILURE(success)) return 0;
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le_uint16 nextStateIndex = SWAPW(entry->nextStateIndex);
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le_uint16 flags = SWAPW(entry->entryFlags);
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le_uint16 ligActionIndex = SWAPW(entry->ligActionIndex);
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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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//LE_DEBUG_BAD_FONT("m==-1 (componentCount went negative)")
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currGlyph+= dir;
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return nextStateIndex;
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}
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ByteOffset actionOffset = flags & lsfPerformAction;
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if (actionOffset != 0) {
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LEReferenceTo<LigatureActionEntry> ap(stHeader, success, ligActionOffset); // byte offset
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ap.addObject(ligActionIndex - 1, success); // index offset ( one before the actual start, because we will pre-increment)
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LEReferenceToArrayOf<TTGlyphID> ligatureTable(stHeader, success, ligatureOffset, LE_UNBOUNDED_ARRAY);
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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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LEReferenceToArrayOf<le_uint16> componentTable(stHeader, success, componentOffset, LE_UNBOUNDED_ARRAY);
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if(LE_FAILURE(success)) {
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currGlyph+= dir;
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return nextStateIndex; // get out! bad font
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}
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do {
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le_uint32 componentGlyph = componentStack[m--]; // pop off
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ap.addObject(success);
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action = SWAPL(*ap.getAlias());
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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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if(componentGlyph > glyphStorage.getGlyphCount()) {
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LE_DEBUG_BAD_FONT("preposterous componentGlyph");
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currGlyph+= dir;
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return nextStateIndex; // get out! bad font
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}
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i += SWAPW(componentTable(LE_GET_GLYPH(glyphStorage[componentGlyph]) + (SignExtend(offset, lafComponentOffsetMask)),success));
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if (action & (lafLast | lafStore)) {
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TTGlyphID ligatureGlyph = SWAPW(ligatureTable(i,success));
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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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currGlyph += dir;
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}
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return nextStateIndex;
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}
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void LigatureSubstitutionProcessor2::endStateTable()
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{
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}
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U_NAMESPACE_END
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