icuSources/layout/MultipleSubstSubtables.cpp

   1 /*
   2  * %W% %E%
   3  *
   4  * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
   5  *
   6  */
   7
   8 #include "LETypes.h"
   9 #include "LEGlyphFilter.h"
  10 #include "OpenTypeTables.h"
  11 #include "GlyphSubstitutionTables.h"
  12 #include "MultipleSubstSubtables.h"
  13 #include "GlyphIterator.h"
  14 #include "LESwaps.h"
  15
  16 U_NAMESPACE_BEGIN
  17
  18 le_uint32 MultipleSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
  19 {
  20     LEGlyphID glyph = glyphIterator->getCurrGlyphID();
  21     le_int32 coverageIndex = getGlyphCoverage(glyph);
  22     le_uint16 seqCount = SWAPW(sequenceCount);
  23
  24     if (coverageIndex >= 0 && coverageIndex < seqCount) {
  25         Offset sequenceTableOffset = SWAPW(sequenceTableOffsetArray[coverageIndex]);
  26         const SequenceTable *sequenceTable = (const SequenceTable *) ((char *) this + sequenceTableOffset);
  27         le_uint16 glyphCount = SWAPW(sequenceTable->glyphCount);
  28
  29         if (glyphCount == 0) {
  30             glyphIterator->setCurrGlyphID(0xFFFF);
  31             return 1;
  32         } else if (glyphCount >= 1) {
  33             TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[0]);
  34
  35             if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, substitute))) {
  36                 glyphIterator->setCurrGlyphID(substitute);
  37             }
  38
  39             return 1;
  40         } else {
  41             // Can't do this 'till there's a way to
  42             // grow the glyph array...
  43             return 1;
  44         }
  45     }
  46
  47     return 0;
  48 }
  49
  50 U_NAMESPACE_END