source/layout/MorphTables.cpp

   1 /*
   2  * %W% %W%
   3  *
   4  * (C) Copyright IBM Corp. 1998 - 2015 - All Rights Reserved
   5  *
   6  */
   7
   8
   9 #include "LETypes.h"
  10 #include "LayoutTables.h"
  11 #include "MorphTables.h"
  12 #include "SubtableProcessor.h"
  13 #include "IndicRearrangementProcessor.h"
  14 #include "ContextualGlyphSubstProc.h"
  15 #include "LigatureSubstProc.h"
  16 #include "NonContextualGlyphSubstProc.h"
  17 //#include "ContextualGlyphInsertionProcessor.h"
  18 #include "LEGlyphStorage.h"
  19 #include "LESwaps.h"
  20
  21 U_NAMESPACE_BEGIN
  22
  23 void MorphTableHeader::process(const LETableReference &base, LEGlyphStorage &glyphStorage, LEErrorCode &success) const
  24 {
  25   le_uint32 chainCount = SWAPL(this->nChains);
  26   LEReferenceTo<ChainHeader> chainHeader(base, success, chains); // moving header
  27     LEReferenceToArrayOf<ChainHeader> chainHeaderArray(base, success, chains, chainCount);
  28     le_uint32 chain;
  29
  30     for (chain = 0; LE_SUCCESS(success) && (chain < chainCount); chain += 1) {
  31         FeatureFlags defaultFlags = SWAPL(chainHeader->defaultFlags);
  32         le_uint32 chainLength = SWAPL(chainHeader->chainLength);
  33         le_int16 nFeatureEntries = SWAPW(chainHeader->nFeatureEntries);
  34         le_int16 nSubtables = SWAPW(chainHeader->nSubtables);
  35         LEReferenceTo<MorphSubtableHeader> subtableHeader =
  36           LEReferenceTo<MorphSubtableHeader>(chainHeader,success, &(chainHeader->featureTable[nFeatureEntries]));
  37         le_int16 subtable;
  38
  39         for (subtable = 0; LE_SUCCESS(success) && (subtable < nSubtables); subtable += 1) {
  40             le_int16 length = SWAPW(subtableHeader->length);
  41             SubtableCoverage coverage = SWAPW(subtableHeader->coverage);
  42             FeatureFlags subtableFeatures = SWAPL(subtableHeader->subtableFeatures);
  43
  44             // should check coverage more carefully...
  45             if ((coverage & scfVertical) == 0 && (subtableFeatures & defaultFlags) != 0  && LE_SUCCESS(success)) {
  46               subtableHeader->process(subtableHeader, glyphStorage, success);
  47             }
  48
  49             subtableHeader.addOffset(length, success);
  50         }
  51         chainHeader.addOffset(chainLength, success);
  52     }
  53 }
  54
  55 void MorphSubtableHeader::process(const LEReferenceTo<MorphSubtableHeader> &base, LEGlyphStorage &glyphStorage, LEErrorCode &success) const
  56 {
  57     SubtableProcessor *processor = NULL;
  58
  59     if (LE_FAILURE(success)) return;
  60
  61     switch (SWAPW(coverage) & scfTypeMask)
  62     {
  63     case mstIndicRearrangement:
  64       processor = new IndicRearrangementProcessor(base, success);
  65         break;
  66
  67     case mstContextualGlyphSubstitution:
  68       processor = new ContextualGlyphSubstitutionProcessor(base, success);
  69         break;
  70
  71     case mstLigatureSubstitution:
  72       processor = new LigatureSubstitutionProcessor(base, success);
  73         break;
  74
  75     case mstReservedUnused:
  76         break;
  77
  78     case mstNonContextualGlyphSubstitution:
  79       processor = NonContextualGlyphSubstitutionProcessor::createInstance(base, success);
  80         break;
  81
  82     /*
  83     case mstContextualGlyphInsertion:
  84         processor = new ContextualGlyphInsertionProcessor(this);
  85         break;
  86     */
  87
  88     default:
  89         break;
  90     }
  91
  92     if (processor != NULL) {
  93       if(LE_SUCCESS(success)) {
  94         processor->process(glyphStorage, success);
  95       }
  96       delete processor;
  97     }
  98 }
  99
 100 U_NAMESPACE_END