icuSources/layout/MorphTables.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
   4  *
   5  */
   6
   7 #ifndef __MORPHTABLES_H
   8 #define __MORPHTABLES_H
   9
  10 /**
  11  * \file
  12  * \internal
  13  */
  14
  15 #include "LETypes.h"
  16 #include "LayoutTables.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 class LEGlyphStorage;
  21
  22 typedef le_uint32 FeatureFlags;
  23
  24 typedef le_int16 FeatureType;
  25 typedef le_int16 FeatureSetting;
  26
  27 struct FeatureTableEntry
  28 {
  29     FeatureType     featureType;
  30     FeatureSetting  featureSetting;
  31     FeatureFlags    enableFlags;
  32     FeatureFlags    disableFlags;
  33 };
  34
  35 struct ChainHeader
  36 {
  37     FeatureFlags        defaultFlags;
  38     le_uint32           chainLength;
  39     le_int16           nFeatureEntries;
  40     le_int16           nSubtables;
  41     FeatureTableEntry   featureTable[ANY_NUMBER];
  42 };
  43
  44 struct MorphTableHeader
  45 {
  46     le_int32    version;
  47     le_uint32   nChains;
  48     ChainHeader chains[ANY_NUMBER];
  49
  50     void process(LEGlyphStorage &glyphStorage) const;
  51 };
  52
  53 typedef le_int16 SubtableCoverage;
  54
  55 enum SubtableCoverageFlags
  56 {
  57     scfVertical = 0x8000,
  58     scfReverse  = 0x4000,
  59     scfIgnoreVt = 0x2000,
  60     scfReserved = 0x1FF8,
  61     scfTypeMask = 0x0007
  62 };
  63
  64 enum MorphSubtableType
  65 {
  66     mstIndicRearrangement               = 0,
  67     mstContextualGlyphSubstitution      = 1,
  68     mstLigatureSubstitution             = 2,
  69     mstReservedUnused                   = 3,
  70     mstNonContextualGlyphSubstitution   = 4,
  71     mstContextualGlyphInsertion         = 5
  72 };
  73
  74 struct MorphSubtableHeader
  75 {
  76     le_int16           length;
  77     SubtableCoverage    coverage;
  78     FeatureFlags        subtableFeatures;
  79
  80     void process(LEGlyphStorage &glyphStorage) const;
  81 };
  82
  83 U_NAMESPACE_END
  84 #endif
  85