icuSources/layout/LookupTables.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - 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 #include "LETableReference.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 enum LookupTableFormat
  22 {
  23     ltfSimpleArray      = 0,
  24     ltfSegmentSingle    = 2,
  25     ltfSegmentArray     = 4,
  26     ltfSingleTable      = 6,
  27     ltfTrimmedArray     = 8
  28 };
  29
  30 typedef le_int16 LookupValue;
  31
  32 struct LookupTable
  33 {
  34     le_int16 format;
  35 };
  36
  37 struct LookupSegment
  38 {
  39     TTGlyphID   lastGlyph;
  40     TTGlyphID   firstGlyph;
  41     LookupValue value;
  42 };
  43
  44 struct LookupSingle
  45 {
  46     TTGlyphID   glyph;
  47     LookupValue value;
  48 };
  49
  50 struct BinarySearchLookupTable : LookupTable
  51 {
  52     le_int16 unitSize;
  53     le_int16 nUnits;
  54     le_int16 searchRange;
  55     le_int16 entrySelector;
  56     le_int16 rangeShift;
  57
  58     const LookupSegment *lookupSegment(const LETableReference &base, const LookupSegment *segments, LEGlyphID glyph, LEErrorCode &success) const;
  59
  60     const LookupSingle *lookupSingle(const LETableReference &base, const LookupSingle *entries, LEGlyphID glyph, LEErrorCode &success) const;
  61 };
  62
  63 struct SimpleArrayLookupTable : LookupTable
  64 {
  65     LookupValue valueArray[ANY_NUMBER];
  66 };
  67 LE_VAR_ARRAY(SimpleArrayLookupTable, valueArray)
  68
  69 struct SegmentSingleLookupTable : BinarySearchLookupTable
  70 {
  71     LookupSegment segments[ANY_NUMBER];
  72 };
  73 LE_VAR_ARRAY(SegmentSingleLookupTable, segments)
  74
  75 struct SegmentArrayLookupTable : BinarySearchLookupTable
  76 {
  77     LookupSegment segments[ANY_NUMBER];
  78 };
  79 LE_VAR_ARRAY(SegmentArrayLookupTable, segments)
  80
  81 struct SingleTableLookupTable : BinarySearchLookupTable
  82 {
  83     LookupSingle entries[ANY_NUMBER];
  84 };
  85 LE_VAR_ARRAY(SingleTableLookupTable, entries)
  86
  87 struct TrimmedArrayLookupTable : LookupTable
  88 {
  89     TTGlyphID   firstGlyph;
  90     TTGlyphID   glyphCount;
  91     LookupValue valueArray[ANY_NUMBER];
  92 };
  93 LE_VAR_ARRAY(TrimmedArrayLookupTable, valueArray)
  94
  95 U_NAMESPACE_END
  96 #endif