| /* |
| * |
| * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "MorphTables.h" |
| #include "StateTables.h" |
| #include "MorphStateTables.h" |
| #include "SubtableProcessor.h" |
| #include "StateTableProcessor.h" |
| #include "LigatureSubstProc.h" |
| #include "LEGlyphStorage.h" |
| #include "LESwaps.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| #define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m)))) |
| #define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m)) |
| #define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v)) |
| |
| UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor) |
| |
| LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success) |
| : StateTableProcessor(morphSubtableHeader, success), ligatureSubstitutionHeader(morphSubtableHeader, success) |
| { |
| if(LE_FAILURE(success)) return; |
| ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset); |
| componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset); |
| ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset); |
| |
| entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY); |
| } |
| |
| LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor() |
| { |
| } |
| |
| void LigatureSubstitutionProcessor::beginStateTable() |
| { |
| m = -1; |
| } |
| |
| ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index) |
| { |
| LEErrorCode success = LE_NO_ERROR; |
| const LigatureSubstitutionStateEntry *entry = entryTable.getAlias(index, success); |
| |
| ByteOffset newState = SWAPW(entry->newStateOffset); |
| le_int16 flags = SWAPW(entry->flags); |
| |
| if (flags & lsfSetComponent) { |
| if (++m >= nComponents) { |
| m = 0; |
| } |
| |
| componentStack[m] = currGlyph; |
| } else if ( m == -1) { |
| // bad font- skip this glyph. |
| currGlyph++; |
| return newState; |
| } |
| |
| ByteOffset actionOffset = flags & lsfActionOffsetMask; |
| |
| if (actionOffset != 0) { |
| LEReferenceTo<LigatureActionEntry> ap(stHeader, success, actionOffset); |
| LigatureActionEntry action; |
| le_int32 offset, i = 0; |
| le_int32 stack[nComponents]; |
| le_int16 mm = -1; |
| |
| do { |
| le_uint32 componentGlyph = componentStack[m--]; |
| |
| action = SWAPL(*ap.getAlias()); |
| ap.addObject(success); // ap++ |
| |
| if (m < 0) { |
| m = nComponents - 1; |
| } |
| |
| offset = action & lafComponentOffsetMask; |
| if (offset != 0) { |
| LEReferenceToArrayOf<le_int16> offsetTable(stHeader, success, 2 * SignExtend(offset, lafComponentOffsetMask), LE_UNBOUNDED_ARRAY); |
| |
| if(LE_FAILURE(success)) { |
| currGlyph++; |
| LE_DEBUG_BAD_FONT("off end of ligature substitution header"); |
| return newState; // get out! bad font |
| } |
| if(componentGlyph > (le_uint32)glyphStorage.getGlyphCount()) { |
| LE_DEBUG_BAD_FONT("preposterous componentGlyph"); |
| currGlyph++; |
| return newState; // get out! bad font |
| } |
| i += SWAPW(offsetTable.getObject(LE_GET_GLYPH(glyphStorage[componentGlyph]), success)); |
| |
| if (action & (lafLast | lafStore)) { |
| LEReferenceTo<TTGlyphID> ligatureOffset(stHeader, success, i); |
| TTGlyphID ligatureGlyph = SWAPW(*ligatureOffset.getAlias()); |
| |
| glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph); |
| if(mm==nComponents) { |
| LE_DEBUG_BAD_FONT("exceeded nComponents"); |
| mm--; // don't overrun the stack. |
| } |
| stack[++mm] = componentGlyph; |
| i = 0; |
| } else { |
| glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF); |
| } |
| } |
| #if LE_ASSERT_BAD_FONT |
| if(m<0) { |
| LE_DEBUG_BAD_FONT("m<0") |
| } |
| #endif |
| } while (!(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items |
| |
| while (mm >= 0) { |
| if (++m >= nComponents) { |
| m = 0; |
| } |
| |
| componentStack[m] = stack[mm--]; |
| } |
| } |
| |
| if (!(flags & lsfDontAdvance)) { |
| // should handle reverse too! |
| currGlyph += 1; |
| } |
| |
| return newState; |
| } |
| |
| void LigatureSubstitutionProcessor::endStateTable() |
| { |
| } |
| |
| U_NAMESPACE_END |