icuSources/layout/MorphTables.cpp

   1 /*
   2  * %W% %W%
   3  *
   4  * (C) Copyright IBM Corp. 1998 - 2004 - 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(LEGlyphStorage &glyphStorage) const
  24 {
  25     const ChainHeader *chainHeader = chains;
  26     le_uint32 chainCount = SWAPL(this->nChains);
  27     le_uint32 chain;
  28
  29     for (chain = 0; chain < chainCount; chain += 1) {
  30         FeatureFlags defaultFlags = SWAPL(chainHeader->defaultFlags);
  31         le_uint32 chainLength = SWAPL(chainHeader->chainLength);
  32         le_int16 nFeatureEntries = SWAPW(chainHeader->nFeatureEntries);
  33         le_int16 nSubtables = SWAPW(chainHeader->nSubtables);
  34         const MorphSubtableHeader *subtableHeader =
  35             (const MorphSubtableHeader *)&chainHeader->featureTable[nFeatureEntries];
  36         le_int16 subtable;
  37
  38         for (subtable = 0; subtable < nSubtables; subtable += 1) {
  39             le_int16 length = SWAPW(subtableHeader->length);
  40             SubtableCoverage coverage = SWAPW(subtableHeader->coverage);
  41             FeatureFlags subtableFeatures = SWAPL(subtableHeader->subtableFeatures);
  42
  43             // should check coverage more carefully...
  44             if ((coverage & scfVertical) == 0 && (subtableFeatures & defaultFlags) != 0) {
  45                 subtableHeader->process(glyphStorage);
  46             }
  47
  48             subtableHeader = (const MorphSubtableHeader *) ((char *)subtableHeader + length);
  49         }
  50
  51         chainHeader = (const ChainHeader *)((char *)chainHeader + chainLength);
  52     }
  53 }
  54
  55 void MorphSubtableHeader::process(LEGlyphStorage &glyphStorage) const
  56 {
  57     SubtableProcessor *processor = NULL;
  58
  59     switch (SWAPW(coverage) & scfTypeMask)
  60     {
  61     case mstIndicRearrangement:
  62         processor = new IndicRearrangementProcessor(this);
  63         break;
  64
  65     case mstContextualGlyphSubstitution:
  66         processor = new ContextualGlyphSubstitutionProcessor(this);
  67         break;
  68
  69     case mstLigatureSubstitution:
  70         processor = new LigatureSubstitutionProcessor(this);
  71         break;
  72
  73     case mstReservedUnused:
  74         break;
  75
  76     case mstNonContextualGlyphSubstitution:
  77         processor = NonContextualGlyphSubstitutionProcessor::createInstance(this);
  78         break;
  79
  80     /*
  81     case mstContextualGlyphInsertion:
  82         processor = new ContextualGlyphInsertionProcessor(this);
  83         break;
  84     */
  85
  86     default:
  87         break;
  88     }
  89
  90     if (processor != NULL) {
  91         processor->process(glyphStorage);
  92         delete processor;
  93     }
  94 }
  95
  96 U_NAMESPACE_END