| /* |
| * |
| * (C) Copyright IBM Corp and Others. 1998-2013 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "MorphTables.h" |
| #include "StateTables.h" |
| #include "MorphStateTables.h" |
| #include "SubtableProcessor2.h" |
| #include "StateTableProcessor2.h" |
| #include "LigatureSubstProc2.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(LigatureSubstitutionProcessor2) |
| |
| LigatureSubstitutionProcessor2::LigatureSubstitutionProcessor2(const MorphSubtableHeader2 *morphSubtableHeader) |
| : StateTableProcessor2(morphSubtableHeader) |
| { |
| ligatureSubstitutionHeader = (const LigatureSubstitutionHeader2 *) morphSubtableHeader; |
| ligActionOffset = SWAPL(ligatureSubstitutionHeader->ligActionOffset); |
| componentOffset = SWAPL(ligatureSubstitutionHeader->componentOffset); |
| ligatureOffset = SWAPL(ligatureSubstitutionHeader->ligatureOffset); |
| |
| entryTable = (const LigatureSubstitutionStateEntry2 *) ((char *) &stateTableHeader->stHeader + entryTableOffset); |
| } |
| |
| LigatureSubstitutionProcessor2::~LigatureSubstitutionProcessor2() |
| { |
| } |
| |
| void LigatureSubstitutionProcessor2::beginStateTable() |
| { |
| m = -1; |
| } |
| |
| le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index) |
| { |
| const LigatureSubstitutionStateEntry2 *entry = &entryTable[index]; |
| le_uint16 nextStateIndex = SWAPW(entry->nextStateIndex); |
| le_uint16 flags = SWAPW(entry->entryFlags); |
| le_uint16 ligActionIndex = SWAPW(entry->ligActionIndex); |
| |
| if (flags & lsfSetComponent) { |
| if (++m >= nComponents) { |
| m = 0; |
| } |
| componentStack[m] = currGlyph; |
| } |
| |
| ByteOffset actionOffset = flags & lsfPerformAction; |
| |
| if (actionOffset != 0) { |
| const LigatureActionEntry *ap = (const LigatureActionEntry *) ((char *) &ligatureSubstitutionHeader->stHeader + ligActionOffset) + ligActionIndex; |
| const TTGlyphID *ligatureTable = (const TTGlyphID *) ((char *) &ligatureSubstitutionHeader->stHeader + ligatureOffset); |
| LigatureActionEntry action; |
| le_int32 offset, i = 0; |
| le_int32 stack[nComponents]; |
| le_int16 mm = -1; |
| |
| const le_uint16 *componentTable = (const le_uint16 *)((char *) &ligatureSubstitutionHeader->stHeader + componentOffset); |
| |
| do { |
| le_uint32 componentGlyph = componentStack[m--]; // pop off |
| |
| action = SWAPL(*ap++); |
| |
| if (m < 0) { |
| m = nComponents - 1; |
| } |
| |
| offset = action & lafComponentOffsetMask; |
| if (offset != 0) { |
| |
| i += SWAPW(componentTable[LE_GET_GLYPH(glyphStorage[componentGlyph]) + (SignExtend(offset, lafComponentOffsetMask))]); |
| |
| if (action & (lafLast | lafStore)) { |
| TTGlyphID ligatureGlyph = SWAPW(ligatureTable[i]); |
| glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph); |
| stack[++mm] = componentGlyph; |
| i = 0; |
| } else { |
| glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF); |
| } |
| } |
| } while (!(action & lafLast)); |
| |
| while (mm >= 0) { |
| if (++m >= nComponents) { |
| m = 0; |
| } |
| |
| componentStack[m] = stack[mm--]; |
| } |
| } |
| |
| if (!(flags & lsfDontAdvance)) { |
| currGlyph += dir; |
| } |
| |
| return nextStateIndex; |
| } |
| |
| void LigatureSubstitutionProcessor2::endStateTable() |
| { |
| } |
| |
| U_NAMESPACE_END |