icuSources/layout/GlyphSubstLookupProc.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEGlyphFilter.h"
   9 #include "LEFontInstance.h"
  10 #include "OpenTypeTables.h"
  11 #include "Features.h"
  12 #include "Lookups.h"
  13 #include "ScriptAndLanguage.h"
  14 #include "GlyphDefinitionTables.h"
  15 #include "GlyphSubstitutionTables.h"
  16 #include "SingleSubstitutionSubtables.h"
  17 #include "MultipleSubstSubtables.h"
  18 #include "AlternateSubstSubtables.h"
  19 #include "LigatureSubstSubtables.h"
  20 #include "ContextualSubstSubtables.h"
  21 #include "ExtensionSubtables.h"
  22 #include "LookupProcessor.h"
  23 #include "GlyphSubstLookupProc.h"
  24 #include "LESwaps.h"
  25
  26 U_NAMESPACE_BEGIN
  27
  28 GlyphSubstitutionLookupProcessor::GlyphSubstitutionLookupProcessor(
  29         const GlyphSubstitutionTableHeader *glyphSubstitutionTableHeader,
  30         LETag scriptTag, LETag languageTag, const LEGlyphFilter *filter, const FeatureMap *featureMap, le_int32 featureMapCount, le_bool featureOrder)
  31     : LookupProcessor(
  32                       (char *) glyphSubstitutionTableHeader,
  33                       SWAPW(glyphSubstitutionTableHeader->scriptListOffset),
  34                       SWAPW(glyphSubstitutionTableHeader->featureListOffset),
  35                       SWAPW(glyphSubstitutionTableHeader->lookupListOffset),
  36                       scriptTag, languageTag, featureMap, featureMapCount, featureOrder), fFilter(filter)
  37 {
  38     // anything?
  39 }
  40
  41 GlyphSubstitutionLookupProcessor::GlyphSubstitutionLookupProcessor()
  42 {
  43 }
  44
  45 le_uint32 GlyphSubstitutionLookupProcessor::applySubtable(const LookupSubtable *lookupSubtable, le_uint16 lookupType,
  46                                                        GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
  47 {
  48     le_uint32 delta = 0;
  49
  50     switch(lookupType)
  51     {
  52     case 0:
  53         break;
  54
  55     case gsstSingle:
  56     {
  57         const SingleSubstitutionSubtable *subtable = (const SingleSubstitutionSubtable *) lookupSubtable;
  58
  59         delta = subtable->process(glyphIterator, fFilter);
  60         break;
  61     }
  62
  63     case gsstMultiple:
  64     {
  65         const MultipleSubstitutionSubtable *subtable = (const MultipleSubstitutionSubtable *) lookupSubtable;
  66
  67         delta = subtable->process(glyphIterator, fFilter);
  68         break;
  69     }
  70
  71     case gsstAlternate:
  72     {
  73         const AlternateSubstitutionSubtable *subtable = (const AlternateSubstitutionSubtable *) lookupSubtable;
  74
  75         delta = subtable->process(glyphIterator, fFilter);
  76         break;
  77     }
  78
  79     case gsstLigature:
  80     {
  81         const LigatureSubstitutionSubtable *subtable = (const LigatureSubstitutionSubtable *) lookupSubtable;
  82
  83         delta = subtable->process(glyphIterator, fFilter);
  84         break;
  85     }
  86
  87     case gsstContext:
  88     {
  89         const ContextualSubstitutionSubtable *subtable = (const ContextualSubstitutionSubtable *) lookupSubtable;
  90
  91         delta = subtable->process(this, glyphIterator, fontInstance);
  92         break;
  93     }
  94
  95     case gsstChainingContext:
  96     {
  97         const ChainingContextualSubstitutionSubtable *subtable = (const ChainingContextualSubstitutionSubtable *) lookupSubtable;
  98
  99         delta = subtable->process(this, glyphIterator, fontInstance);
 100         break;
 101     }
 102
 103     case gsstExtension:
 104     {
 105         const ExtensionSubtable *subtable = (const ExtensionSubtable *) lookupSubtable;
 106
 107         delta = subtable->process(this, lookupType, glyphIterator, fontInstance);
 108         break;
 109     }
 110
 111     default:
 112         break;
 113     }
 114
 115     return delta;
 116 }
 117
 118 GlyphSubstitutionLookupProcessor::~GlyphSubstitutionLookupProcessor()
 119 {
 120 }
 121
 122 U_NAMESPACE_END