icuSources/layout/LookupTables.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
   4  *
   5  */
   6
   7 #ifndef __LOOKUPTABLES_H
   8 #define __LOOKUPTABLES_H
   9
  10 /**
  11  * \file
  12  * \internal
  13  */
  14
  15 #include "LETypes.h"
  16 #include "LayoutTables.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 enum LookupTableFormat
  21 {
  22     ltfSimpleArray      = 0,
  23     ltfSegmentSingle    = 2,
  24     ltfSegmentArray     = 4,
  25     ltfSingleTable      = 6,
  26     ltfTrimmedArray     = 8
  27 };
  28
  29 typedef le_int16 LookupValue;
  30
  31 struct LookupTable
  32 {
  33     le_int16 format;
  34 };
  35
  36 struct LookupSegment
  37 {
  38     TTGlyphID   lastGlyph;
  39     TTGlyphID   firstGlyph;
  40     LookupValue value;
  41 };
  42
  43 struct LookupSingle
  44 {
  45     TTGlyphID   glyph;
  46     LookupValue value;
  47 };
  48
  49 struct BinarySearchLookupTable : LookupTable
  50 {
  51     le_int16 unitSize;
  52     le_int16 nUnits;
  53     le_int16 searchRange;
  54     le_int16 entrySelector;
  55     le_int16 rangeShift;
  56
  57     const LookupSegment *lookupSegment(const LookupSegment *segments, LEGlyphID glyph) const;
  58
  59     const LookupSingle *lookupSingle(const LookupSingle *entries, LEGlyphID glyph) const;
  60 };
  61
  62 struct SimpleArrayLookupTable : LookupTable
  63 {
  64     LookupValue valueArray[ANY_NUMBER];
  65 };
  66
  67 struct SegmentSingleLookupTable : BinarySearchLookupTable
  68 {
  69     LookupSegment segments[ANY_NUMBER];
  70 };
  71
  72 struct SegmentArrayLookupTable : BinarySearchLookupTable
  73 {
  74     LookupSegment segments[ANY_NUMBER];
  75 };
  76
  77 struct SingleTableLookupTable : BinarySearchLookupTable
  78 {
  79     LookupSingle entries[ANY_NUMBER];
  80 };
  81
  82 struct TrimmedArrayLookupTable : LookupTable
  83 {
  84     TTGlyphID   firstGlyph;
  85     TTGlyphID   glyphCount;
  86     LookupValue valueArray[ANY_NUMBER];
  87 };
  88
  89 U_NAMESPACE_END
  90 #endif