source/layout/ContextualSubstSubtables.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   4  *
   5  */
   6
   7 #ifndef __CONTEXTUALSUBSTITUTIONSUBTABLES_H
   8 #define __CONTEXTUALSUBSTITUTIONSUBTABLES_H
   9
  10 /**
  11  * \file
  12  * \internal
  13  */
  14
  15 #include "LETypes.h"
  16 #include "LEFontInstance.h"
  17 #include "OpenTypeTables.h"
  18 #include "GlyphSubstitutionTables.h"
  19 #include "GlyphIterator.h"
  20 #include "LookupProcessor.h"
  21 #include "LETableReference.h"
  22
  23 U_NAMESPACE_BEGIN
  24
  25 struct SubstitutionLookupRecord
  26 {
  27     le_uint16  sequenceIndex;
  28     le_uint16  lookupListIndex;
  29 };
  30
  31 struct ContextualSubstitutionBase : GlyphSubstitutionSubtable
  32 {
  33     static le_bool matchGlyphIDs(
  34         const TTGlyphID *glyphArray, le_uint16 glyphCount, GlyphIterator *glyphIterator,
  35         le_bool backtrack = FALSE);
  36
  37     static le_bool matchGlyphClasses(
  38         const le_uint16 *classArray, le_uint16 glyphCount, GlyphIterator *glyphIterator,
  39         const ClassDefinitionTable *classDefinitionTable, le_bool backtrack = FALSE);
  40
  41     static le_bool matchGlyphCoverages(
  42         const Offset *coverageTableOffsetArray, le_uint16 glyphCount,
  43         GlyphIterator *glyphIterator, const char *offsetBase, le_bool backtrack = FALSE);
  44
  45     static void applySubstitutionLookups(
  46         const LookupProcessor *lookupProcessor,
  47         const SubstitutionLookupRecord *substLookupRecordArray,
  48         le_uint16 substCount,
  49         GlyphIterator *glyphIterator,
  50         const LEFontInstance *fontInstance,
  51         le_int32 position,
  52         LEErrorCode& success);
  53 };
  54
  55 struct ContextualSubstitutionSubtable : ContextualSubstitutionBase
  56 {
  57     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
  58 };
  59
  60 struct ContextualSubstitutionFormat1Subtable : ContextualSubstitutionSubtable
  61 {
  62     le_uint16  subRuleSetCount;
  63     Offset  subRuleSetTableOffsetArray[ANY_NUMBER];
  64
  65     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
  66 };
  67 LE_VAR_ARRAY(ContextualSubstitutionFormat1Subtable, subRuleSetTableOffsetArray)
  68
  69
  70 struct SubRuleSetTable
  71 {
  72     le_uint16  subRuleCount;
  73     Offset  subRuleTableOffsetArray[ANY_NUMBER];
  74
  75 };
  76 LE_VAR_ARRAY(SubRuleSetTable, subRuleTableOffsetArray)
  77
  78 // NOTE: Multiple variable size arrays!!
  79 struct SubRuleTable
  80 {
  81     le_uint16  glyphCount;
  82     le_uint16  substCount;
  83     TTGlyphID inputGlyphArray[ANY_NUMBER];
  84   //SubstitutionLookupRecord substLookupRecordArray[ANY_NUMBER];
  85 };
  86 LE_VAR_ARRAY(SubRuleTable, inputGlyphArray)
  87
  88 struct ContextualSubstitutionFormat2Subtable : ContextualSubstitutionSubtable
  89 {
  90     Offset  classDefTableOffset;
  91     le_uint16  subClassSetCount;
  92     Offset  subClassSetTableOffsetArray[ANY_NUMBER];
  93
  94     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
  95 };
  96 LE_VAR_ARRAY(ContextualSubstitutionFormat2Subtable, subClassSetTableOffsetArray)
  97
  98
  99 struct SubClassSetTable
 100 {
 101     le_uint16  subClassRuleCount;
 102     Offset  subClassRuleTableOffsetArray[ANY_NUMBER];
 103 };
 104 LE_VAR_ARRAY(SubClassSetTable, subClassRuleTableOffsetArray)
 105
 106
 107 // NOTE: Multiple variable size arrays!!
 108 struct SubClassRuleTable
 109 {
 110     le_uint16  glyphCount;
 111     le_uint16  substCount;
 112     le_uint16  classArray[ANY_NUMBER];
 113   //SubstitutionLookupRecord substLookupRecordArray[ANY_NUMBER];
 114 };
 115 LE_VAR_ARRAY(SubClassRuleTable, classArray)
 116
 117
 118 // NOTE: This isn't a subclass of GlyphSubstitutionSubtable 'cause
 119 // it has an array of coverage tables instead of a single coverage table...
 120 //
 121 // NOTE: Multiple variable size arrays!!
 122 struct ContextualSubstitutionFormat3Subtable
 123 {
 124     le_uint16  substFormat;
 125     le_uint16  glyphCount;
 126     le_uint16  substCount;
 127     Offset  coverageTableOffsetArray[ANY_NUMBER];
 128   //SubstitutionLookupRecord substLookupRecord[ANY_NUMBER];
 129
 130     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
 131 };
 132 LE_VAR_ARRAY(ContextualSubstitutionFormat3Subtable, coverageTableOffsetArray)
 133
 134 struct ChainingContextualSubstitutionSubtable : ContextualSubstitutionBase
 135 {
 136     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
 137 };
 138
 139 struct ChainingContextualSubstitutionFormat1Subtable : ChainingContextualSubstitutionSubtable
 140 {
 141     le_uint16  chainSubRuleSetCount;
 142     Offset  chainSubRuleSetTableOffsetArray[ANY_NUMBER];
 143
 144     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
 145 };
 146 LE_VAR_ARRAY(ChainingContextualSubstitutionFormat1Subtable, chainSubRuleSetTableOffsetArray)
 147
 148
 149 struct ChainSubRuleSetTable
 150 {
 151     le_uint16  chainSubRuleCount;
 152     Offset  chainSubRuleTableOffsetArray[ANY_NUMBER];
 153
 154 };
 155 LE_VAR_ARRAY(ChainSubRuleSetTable, chainSubRuleTableOffsetArray)
 156
 157 // NOTE: Multiple variable size arrays!!
 158 struct ChainSubRuleTable
 159 {
 160     le_uint16  backtrackGlyphCount;
 161     TTGlyphID backtrackGlyphArray[ANY_NUMBER];
 162   //le_uint16  inputGlyphCount;
 163   //TTGlyphID inputGlyphArray[ANY_NUMBER];
 164   //le_uint16  lookaheadGlyphCount;
 165   //TTGlyphID lookaheadGlyphArray[ANY_NUMBER];
 166   //le_uint16  substCount;
 167   //SubstitutionLookupRecord substLookupRecordArray[ANY_NUMBER];
 168 };
 169 LE_VAR_ARRAY(ChainSubRuleTable, backtrackGlyphArray)
 170
 171 struct ChainingContextualSubstitutionFormat2Subtable : ChainingContextualSubstitutionSubtable
 172 {
 173     Offset  backtrackClassDefTableOffset;
 174     Offset  inputClassDefTableOffset;
 175     Offset  lookaheadClassDefTableOffset;
 176     le_uint16  chainSubClassSetCount;
 177     Offset  chainSubClassSetTableOffsetArray[ANY_NUMBER];
 178
 179     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
 180 };
 181 LE_VAR_ARRAY(ChainingContextualSubstitutionFormat2Subtable, chainSubClassSetTableOffsetArray)
 182
 183 struct ChainSubClassSetTable
 184 {
 185     le_uint16  chainSubClassRuleCount;
 186     Offset  chainSubClassRuleTableOffsetArray[ANY_NUMBER];
 187 };
 188 LE_VAR_ARRAY(ChainSubClassSetTable, chainSubClassRuleTableOffsetArray)
 189
 190
 191 // NOTE: Multiple variable size arrays!!
 192 struct ChainSubClassRuleTable
 193 {
 194     le_uint16  backtrackGlyphCount;
 195     le_uint16  backtrackClassArray[ANY_NUMBER];
 196   //le_uint16  inputGlyphCount;
 197   //le_uint16  inputClassArray[ANY_NUMBER];
 198   //le_uint16  lookaheadGlyphCount;
 199   //le_uint16  lookaheadClassArray[ANY_NUMBER];
 200   //le_uint16  substCount;
 201   //SubstitutionLookupRecord substLookupRecordArray[ANY_NUMBER];
 202 };
 203 LE_VAR_ARRAY(ChainSubClassRuleTable, backtrackClassArray)
 204
 205 // NOTE: This isn't a subclass of GlyphSubstitutionSubtable 'cause
 206 // it has arrays of coverage tables instead of a single coverage table...
 207 //
 208 // NOTE: Multiple variable size arrays!!
 209 struct ChainingContextualSubstitutionFormat3Subtable
 210 {
 211     le_uint16  substFormat;
 212     le_uint16  backtrackGlyphCount;
 213     Offset  backtrackCoverageTableOffsetArray[ANY_NUMBER];
 214   //le_uint16  inputGlyphCount;
 215   //Offset  inputCoverageTableOffsetArray[ANY_NUMBER];
 216   //le_uint16  lookaheadGlyphCount;
 217   //le_uint16  lookaheadCoverageTableOffsetArray[ANY_NUMBER];
 218   //le_uint16  substCount;
 219   //SubstitutionLookupRecord substLookupRecord[ANY_NUMBER];
 220
 221     le_uint32  process(const LookupProcessor *lookupProcessor, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const;
 222 };
 223 LE_VAR_ARRAY(ChainingContextualSubstitutionFormat3Subtable, backtrackCoverageTableOffsetArray)
 224
 225
 226 U_NAMESPACE_END
 227 #endif