icuSources/layout/MorphTables2.cpp

   1 /*
   2  * (C) Copyright IBM Corp. and others 1998 - 2015 - All Rights Reserved
   3  *
   4  */
   5
   6 #include "LETypes.h"
   7 #include "LayoutTables.h"
   8 #include "MorphTables.h"
   9 #include "SubtableProcessor2.h"
  10 #include "IndicRearrangementProcessor2.h"
  11 #include "ContextualGlyphSubstProc2.h"
  12 #include "LigatureSubstProc2.h"
  13 #include "NonContextualGlyphSubstProc2.h"
  14 #include "ContextualGlyphInsertionProc2.h"
  15 #include "LEGlyphStorage.h"
  16 #include "LESwaps.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 void MorphTableHeader2::process(const LEReferenceTo<MorphTableHeader2> &base, LEGlyphStorage &glyphStorage,
  21                                 le_int32 typoFlags, LEErrorCode &success) const
  22 {
  23   if(LE_FAILURE(success)) return;
  24
  25   le_uint32 chainCount = SWAPL(this->nChains);
  26   LEReferenceTo<ChainHeader2> chainHeader(base, success, &chains[0]);
  27   /* chainHeader and subtableHeader are implemented as a moving pointer rather than an array dereference
  28    * to (slightly) reduce code churn. However, must be careful to preincrement them the 2nd time through.
  29    * We don't want to increment them at the end of the loop, as that would attempt to dereference
  30    * out of range memory.
  31    */
  32   le_uint32 chain;
  33
  34   for (chain = 0; LE_SUCCESS(success) && (chain < chainCount); chain++) {
  35         if (chain>0) {
  36           le_uint32 chainLength = SWAPL(chainHeader->chainLength);
  37           chainHeader.addOffset(chainLength, success); // Don't increment the first time
  38         }
  39         FeatureFlags flag = SWAPL(chainHeader->defaultFlags);
  40         le_uint32 nFeatureEntries = SWAPL(chainHeader->nFeatureEntries);
  41         le_uint32 nSubtables = SWAPL(chainHeader->nSubtables);
  42         LEReferenceTo<MorphSubtableHeader2> subtableHeader(chainHeader,
  43               success, (const MorphSubtableHeader2 *)&chainHeader->featureTable[nFeatureEntries]);
  44         le_uint32 subtable;
  45         if(LE_FAILURE(success)) break; // malformed table
  46
  47         if (typoFlags != 0) {
  48            le_uint32 featureEntry;
  49            LEReferenceToArrayOf<FeatureTableEntry> featureTableRef(chainHeader, success, &chainHeader->featureTable[0], nFeatureEntries);
  50            if(LE_FAILURE(success)) break;
  51             // Feature subtables
  52             for (featureEntry = 0; featureEntry < nFeatureEntries; featureEntry++) {
  53                 const FeatureTableEntry &featureTableEntry = featureTableRef(featureEntry, success);
  54                 le_int16 featureType = SWAPW(featureTableEntry.featureType);
  55                 le_int16 featureSetting = SWAPW(featureTableEntry.featureSetting);
  56                 le_uint32 enableFlags = SWAPL(featureTableEntry.enableFlags);
  57                 le_uint32 disableFlags = SWAPL(featureTableEntry.disableFlags);
  58                 switch (featureType) {
  59                     case ligaturesType:
  60                         if ((typoFlags & LE_Ligatures_FEATURE_ENUM ) && (featureSetting ^ 0x1)){
  61                             flag &= disableFlags;
  62                             flag |= enableFlags;
  63                         } else {
  64                             if (((typoFlags & LE_RLIG_FEATURE_FLAG) && featureSetting == requiredLigaturesOnSelector) ||
  65                                 ((typoFlags & LE_CLIG_FEATURE_FLAG) && featureSetting == contextualLigaturesOnSelector) ||
  66                                 ((typoFlags & LE_HLIG_FEATURE_FLAG) && featureSetting == historicalLigaturesOnSelector) ||
  67                                 ((typoFlags & LE_LIGA_FEATURE_FLAG) && featureSetting == commonLigaturesOnSelector)) {
  68                                 flag &= disableFlags;
  69                                 flag |= enableFlags;
  70                             }
  71                         }
  72                         break;
  73                     case letterCaseType:
  74                         if ((typoFlags & LE_SMCP_FEATURE_FLAG) && featureSetting == smallCapsSelector) {
  75                             flag &= disableFlags;
  76                             flag |= enableFlags;
  77                         }
  78                         break;
  79                     case verticalSubstitutionType:
  80                         break;
  81                     case linguisticRearrangementType:
  82                         break;
  83                     case numberSpacingType:
  84                         break;
  85                     case smartSwashType:
  86                         if ((typoFlags & LE_SWSH_FEATURE_FLAG) && (featureSetting ^ 0x1)){
  87                             flag &= disableFlags;
  88                             flag |= enableFlags;
  89                         }
  90                         break;
  91                     case diacriticsType:
  92                         break;
  93                     case verticalPositionType:
  94                         break;
  95                     case fractionsType:
  96                         if (((typoFlags & LE_FRAC_FEATURE_FLAG) && featureSetting == diagonalFractionsSelector) ||
  97                             ((typoFlags & LE_AFRC_FEATURE_FLAG) && featureSetting == verticalFractionsSelector)) {
  98                             flag &= disableFlags;
  99                             flag |= enableFlags;
 100                         } else {
 101                             flag &= disableFlags;
 102                         }
 103                         break;
 104                     case typographicExtrasType:
 105                         if ((typoFlags & LE_ZERO_FEATURE_FLAG) && featureSetting == slashedZeroOnSelector) {
 106                             flag &= disableFlags;
 107                             flag |= enableFlags;
 108                         }
 109                         break;
 110                     case mathematicalExtrasType:
 111                         break;
 112                     case ornamentSetsType:
 113                         break;
 114                     case characterAlternativesType:
 115                         break;
 116                     case designComplexityType:
 117                         if (((typoFlags & LE_SS01_FEATURE_FLAG) && featureSetting == designLevel1Selector) ||
 118                             ((typoFlags & LE_SS02_FEATURE_FLAG) && featureSetting == designLevel2Selector) ||
 119                             ((typoFlags & LE_SS03_FEATURE_FLAG) && featureSetting == designLevel3Selector) ||
 120                             ((typoFlags & LE_SS04_FEATURE_FLAG) && featureSetting == designLevel4Selector) ||
 121                             ((typoFlags & LE_SS05_FEATURE_FLAG) && featureSetting == designLevel5Selector) ||
 122                             ((typoFlags & LE_SS06_FEATURE_FLAG) && featureSetting == designLevel6Selector) ||
 123                             ((typoFlags & LE_SS07_FEATURE_FLAG) && featureSetting == designLevel7Selector)) {
 124
 125                             flag &= disableFlags;
 126                             flag |= enableFlags;
 127                         }
 128                         break;
 129                     case styleOptionsType:
 130                         break;
 131                     case characterShapeType:
 132                         break;
 133                     case numberCaseType:
 134                         break;
 135                     case textSpacingType:
 136                         break;
 137                     case transliterationType:
 138                         break;
 139                     case annotationType:
 140                         if ((typoFlags & LE_NALT_FEATURE_FLAG) && featureSetting == circleAnnotationSelector) {
 141                             flag &= disableFlags;
 142                             flag |= enableFlags;
 143                         }
 144                         break;
 145                     case kanaSpacingType:
 146                         break;
 147                     case ideographicSpacingType:
 148                         break;
 149                     case rubyKanaType:
 150                         if ((typoFlags & LE_RUBY_FEATURE_FLAG) && featureSetting == rubyKanaOnSelector) {
 151                             flag &= disableFlags;
 152                             flag |= enableFlags;
 153                         }
 154                         break;
 155                     case cjkRomanSpacingType:
 156                         break;
 157                     default:
 158                         break;
 159                 }
 160             }
 161         }
 162
 163         for (subtable = 0;  LE_SUCCESS(success) && subtable < nSubtables; subtable++) {
 164             if(subtable>0)  {
 165               le_uint32 length = SWAPL(subtableHeader->length);
 166               subtableHeader.addOffset(length, success); // Don't addOffset for the last entry.
 167               if (LE_FAILURE(success)) break;
 168             }
 169             le_uint32 coverage = SWAPL(subtableHeader->coverage);
 170             FeatureFlags subtableFeatures = SWAPL(subtableHeader->subtableFeatures);
 171             // should check coverage more carefully...
 172             if (((coverage & scfIgnoreVt2) || !(coverage & scfVertical2)) && (subtableFeatures & flag) != 0) {
 173               subtableHeader->process(subtableHeader, glyphStorage, success);
 174             }
 175         }
 176     }
 177 }
 178
 179 void MorphSubtableHeader2::process(const LEReferenceTo<MorphSubtableHeader2> &base, LEGlyphStorage &glyphStorage, LEErrorCode &success) const
 180 {
 181     SubtableProcessor2 *processor = NULL;
 182
 183     if (LE_FAILURE(success)) return;
 184
 185     switch (SWAPL(coverage) & scfTypeMask2)
 186     {
 187     case mstIndicRearrangement:
 188         processor = new IndicRearrangementProcessor2(base, success);
 189         break;
 190
 191     case mstContextualGlyphSubstitution:
 192         processor = new ContextualGlyphSubstitutionProcessor2(base, success);
 193         break;
 194
 195     case mstLigatureSubstitution:
 196         processor = new LigatureSubstitutionProcessor2(base, success);
 197         break;
 198
 199     case mstReservedUnused:
 200         break;
 201
 202     case mstNonContextualGlyphSubstitution:
 203         processor = NonContextualGlyphSubstitutionProcessor2::createInstance(base, success);
 204         break;
 205
 206
 207     case mstContextualGlyphInsertion:
 208         processor = new ContextualGlyphInsertionProcessor2(base, success);
 209         break;
 210
 211     default:
 212         return;
 213         break; /*NOTREACHED*/
 214     }
 215
 216     if (processor != NULL) {
 217       processor->process(glyphStorage, success);
 218         delete processor;
 219     } else {
 220       if(LE_SUCCESS(success)) {
 221         success = LE_MEMORY_ALLOCATION_ERROR; // because ptr is null and we didn't break out.
 222       }
 223     }
 224 }
 225
 226 U_NAMESPACE_END