icuSources/layout/SingleSubstitutionSubtables.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEGlyphFilter.h"
   9 #include "OpenTypeTables.h"
  10 #include "GlyphSubstitutionTables.h"
  11 #include "SingleSubstitutionSubtables.h"
  12 #include "GlyphIterator.h"
  13 #include "LESwaps.h"
  14
  15 U_NAMESPACE_BEGIN
  16
  17 le_uint32 SingleSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
  18 {
  19     switch(SWAPW(subtableFormat))
  20     {
  21     case 0:
  22         return 0;
  23
  24     case 1:
  25     {
  26         const SingleSubstitutionFormat1Subtable *subtable = (const SingleSubstitutionFormat1Subtable *) this;
  27
  28         return subtable->process(glyphIterator, filter);
  29     }
  30
  31     case 2:
  32     {
  33         const SingleSubstitutionFormat2Subtable *subtable = (const SingleSubstitutionFormat2Subtable *) this;
  34
  35         return subtable->process(glyphIterator, filter);
  36     }
  37
  38     default:
  39         return 0;
  40     }
  41 }
  42
  43 le_uint32 SingleSubstitutionFormat1Subtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
  44 {
  45     LEGlyphID glyph = glyphIterator->getCurrGlyphID();
  46     le_int32 coverageIndex = getGlyphCoverage(glyph);
  47
  48     if (coverageIndex >= 0) {
  49         TTGlyphID substitute = ((TTGlyphID) LE_GET_GLYPH(glyph)) + SWAPW(deltaGlyphID);
  50
  51         if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, substitute))) {
  52             glyphIterator->setCurrGlyphID(substitute);
  53         }
  54
  55         return 1;
  56     }
  57
  58     return 0;
  59 }
  60
  61 le_uint32 SingleSubstitutionFormat2Subtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
  62 {
  63     LEGlyphID glyph = glyphIterator->getCurrGlyphID();
  64     le_int32 coverageIndex = getGlyphCoverage(glyph);
  65
  66     if (coverageIndex >= 0) {
  67         TTGlyphID substitute = SWAPW(substituteArray[coverageIndex]);
  68
  69         if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, substitute))) {
  70             glyphIterator->setCurrGlyphID(substitute);
  71         }
  72
  73         return 1;
  74     }
  75
  76     return 0;
  77 }
  78
  79 U_NAMESPACE_END