icuSources/layout/Lookups.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   4  *
   5  */
   6
   7 #ifndef __LOOKUPS_H
   8 #define __LOOKUPS_H
   9
  10 /**
  11  * \file
  12  * \internal
  13  */
  14
  15 #include "LETypes.h"
  16 #include "OpenTypeTables.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 enum LookupFlags
  21 {
  22     lfBaselineIsLogicalEnd  = 0x0001,  // The MS spec. calls this flag "RightToLeft" but this name is more accurate
  23     lfIgnoreBaseGlyphs      = 0x0002,
  24     lfIgnoreLigatures       = 0x0004,
  25     lfIgnoreMarks           = 0x0008,
  26     lfReservedMask          = 0x00F0,
  27     lfMarkAttachTypeMask    = 0xFF00,
  28     lfMarkAttachTypeShift   = 8
  29 };
  30
  31 struct LookupSubtable
  32 {
  33     le_uint16 subtableFormat;
  34     Offset    coverageTableOffset;
  35
  36   inline le_int32  getGlyphCoverage(const LEReferenceTo<LookupSubtable> &base, LEGlyphID glyphID, LEErrorCode &success) const;
  37
  38   le_int32  getGlyphCoverage(const LEReferenceTo<LookupSubtable> &base, Offset tableOffset, LEGlyphID glyphID, LEErrorCode &success) const;
  39
  40   // convenience
  41   inline le_int32  getGlyphCoverage(const LETableReference &base, LEGlyphID glyphID, LEErrorCode &success) const;
  42
  43   inline le_int32  getGlyphCoverage(const LETableReference &base, Offset tableOffset, LEGlyphID glyphID, LEErrorCode &success) const;
  44 };
  45
  46 struct LookupTable
  47 {
  48     le_uint16       lookupType;
  49     le_uint16       lookupFlags;
  50     le_uint16       subTableCount;
  51     Offset          subTableOffsetArray[ANY_NUMBER];
  52
  53   const LEReferenceTo<LookupSubtable> getLookupSubtable(const LEReferenceTo<LookupTable> &base, le_uint16 subtableIndex, LEErrorCode &success) const;
  54 };
  55 LE_VAR_ARRAY(LookupTable, subTableOffsetArray)
  56
  57 struct LookupListTable
  58 {
  59     le_uint16   lookupCount;
  60     Offset      lookupTableOffsetArray[ANY_NUMBER];
  61
  62   const LEReferenceTo<LookupTable> getLookupTable(const LEReferenceTo<LookupListTable> &base, le_uint16 lookupTableIndex, LEErrorCode &success) const;
  63 };
  64 LE_VAR_ARRAY(LookupListTable, lookupTableOffsetArray)
  65
  66 inline le_int32 LookupSubtable::getGlyphCoverage(const LEReferenceTo<LookupSubtable> &base, LEGlyphID glyphID, LEErrorCode &success) const
  67 {
  68   return getGlyphCoverage(base, coverageTableOffset, glyphID, success);
  69 }
  70
  71 inline le_int32  LookupSubtable::getGlyphCoverage(const LETableReference &base, LEGlyphID glyphID, LEErrorCode &success) const {
  72   LEReferenceTo<LookupSubtable> thisRef(base, success, this);
  73   return getGlyphCoverage(thisRef, glyphID, success);
  74 }
  75
  76 inline le_int32  LookupSubtable::getGlyphCoverage(const LETableReference &base, Offset tableOffset, LEGlyphID glyphID, LEErrorCode &success) const {
  77   LEReferenceTo<LookupSubtable> thisRef(base, success, this);
  78   return getGlyphCoverage(thisRef, tableOffset, glyphID, success);
  79 }
  80
  81 U_NAMESPACE_END
  82 #endif