1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 /* 27 * 28 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved 29 * 30 */ 31 32 #include "LETypes.h" 33 #include "MorphTables.h" 34 #include "StateTables.h" 35 #include "MorphStateTables.h" 36 #include "SubtableProcessor.h" 37 #include "StateTableProcessor.h" 38 #include "LigatureSubstProc.h" 39 #include "LEGlyphStorage.h" 40 #include "LESwaps.h" 41 42 U_NAMESPACE_BEGIN 43 44 #define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m)))) 45 #define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m)) 46 #define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v)) 47 48 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor) 49 50 LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success) 51 : StateTableProcessor(morphSubtableHeader, success), ligatureSubstitutionHeader(morphSubtableHeader, success) 52 { 53 if(LE_FAILURE(success)) return; 54 ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset); 55 componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset); 56 ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset); 57 58 entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY); 59 } 60 61 LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor() 62 { 63 } 64 65 void LigatureSubstitutionProcessor::beginStateTable() 66 { 67 m = -1; 68 } 69 70 ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index, LEErrorCode &success) 71 { 72 const LigatureSubstitutionStateEntry *entry = entryTable.getAlias(index, success); 73 if (LE_FAILURE(success)) { 74 currGlyph++; 75 return 0; 76 } 77 78 ByteOffset newState = SWAPW(entry->newStateOffset); 79 le_uint16 flags = SWAPW(entry->flags); 80 81 if (flags & lsfSetComponent) { 82 if (++m >= nComponents) { 83 m = 0; 84 } 85 86 componentStack[m] = currGlyph; 87 } else if ( m == -1) { 88 // bad font- skip this glyph. 89 currGlyph++; 90 return newState; 91 } 92 93 ByteOffset actionOffset = flags & lsfActionOffsetMask; 94 95 if (actionOffset != 0) { 96 LEReferenceTo<LigatureActionEntry> ap(stHeader, success, actionOffset); 97 if (LE_FAILURE(success)) { 98 currGlyph++; 99 return newState; 100 } 101 LigatureActionEntry action; 102 le_int32 offset, i = 0, j = 0; 103 le_int32 stack[nComponents]; 104 le_int16 mm = -1; 105 106 do { 107 le_uint32 componentGlyph = componentStack[m--]; 108 109 if (j++ > 0) { 110 ap.addObject(success); 111 if (LE_FAILURE(success)) { 112 currGlyph++; 113 return newState; 114 } 115 } 116 117 action = SWAPL(*ap.getAlias()); 118 119 if (m < 0) { 120 m = nComponents - 1; 121 } 122 123 offset = action & lafComponentOffsetMask; 124 if (offset != 0) { 125 LEReferenceToArrayOf<le_int16> offsetTable(stHeader, success, 2 * SignExtend(offset, lafComponentOffsetMask), LE_UNBOUNDED_ARRAY); 126 127 if(LE_FAILURE(success)) { 128 currGlyph++; 129 LE_DEBUG_BAD_FONT("off end of ligature substitution header"); 130 return newState; // get out! bad font 131 } 132 if(componentGlyph >= glyphStorage.getGlyphCount()) { 133 LE_DEBUG_BAD_FONT("preposterous componentGlyph"); 134 currGlyph++; 135 return newState; // get out! bad font 136 } 137 i += SWAPW(offsetTable.getObject(LE_GET_GLYPH(glyphStorage[componentGlyph]), success)); 138 if (LE_FAILURE(success)) { 139 currGlyph++; 140 return newState; 141 } 142 143 if (action & (lafLast | lafStore)) { 144 LEReferenceTo<TTGlyphID> ligatureOffset(stHeader, success, i); 145 if (LE_FAILURE(success)) { 146 currGlyph++; 147 return newState; 148 } 149 TTGlyphID ligatureGlyph = SWAPW(*ligatureOffset.getAlias()); 150 151 glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph); 152 if(mm==nComponents) { 153 LE_DEBUG_BAD_FONT("exceeded nComponents"); 154 mm--; // don't overrun the stack. 155 } 156 stack[++mm] = componentGlyph; 157 i = 0; 158 } else { 159 glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF); 160 } 161 } 162 #if LE_ASSERT_BAD_FONT 163 if(m<0) { 164 LE_DEBUG_BAD_FONT("m<0") 165 } 166 #endif 167 } while (!(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items 168 169 while (mm >= 0) { 170 if (++m >= nComponents) { 171 m = 0; 172 } 173 174 componentStack[m] = stack[mm--]; 175 } 176 } 177 178 if (!(flags & lsfDontAdvance)) { 179 // should handle reverse too! 180 currGlyph += 1; 181 } 182 183 return newState; 184 } 185 186 void LigatureSubstitutionProcessor::endStateTable() 187 { 188 } 189 190 U_NAMESPACE_END