icuSources/layout/LookupTables.h

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2016 - 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 #include "Lookups.h"
  19
  20 U_NAMESPACE_BEGIN
  21
  22 enum LookupTableFormat
  23 {
  24     ltfSimpleArray      = 0,
  25     ltfSegmentSingle    = 2,
  26     ltfSegmentArray     = 4,
  27     ltfSingleTable      = 6,
  28     ltfTrimmedArray     = 8
  29 };
  30
  31 typedef le_int16 LookupValue;
  32
  33 // Different from struct LookupTable in Lookups.h.
  34 struct LookupTableBase
  35 {
  36     le_int16 format;
  37 };
  38
  39 struct LookupSegment
  40 {
  41     TTGlyphID   lastGlyph;
  42     TTGlyphID   firstGlyph;
  43     LookupValue value;
  44 };
  45
  46 struct LookupSingle
  47 {
  48     TTGlyphID   glyph;
  49     LookupValue value;
  50 };
  51
  52 struct BinarySearchLookupTable : LookupTableBase
  53 {
  54     le_int16 unitSize;
  55     le_int16 nUnits;
  56     le_int16 searchRange;
  57     le_int16 entrySelector;
  58     le_int16 rangeShift;
  59
  60     const LookupSegment *lookupSegment(const LETableReference &base, const LookupSegment *segments, LEGlyphID glyph, LEErrorCode &success) const;
  61
  62     const LookupSingle *lookupSingle(const LETableReference &base, const LookupSingle *entries, LEGlyphID glyph, LEErrorCode &success) const;
  63 };
  64
  65 struct SimpleArrayLookupTable : LookupTableBase
  66 {
  67     LookupValue valueArray[ANY_NUMBER];
  68 };
  69 LE_VAR_ARRAY(SimpleArrayLookupTable, valueArray)
  70
  71 struct SegmentSingleLookupTable : BinarySearchLookupTable
  72 {
  73     LookupSegment segments[ANY_NUMBER];
  74 };
  75 LE_VAR_ARRAY(SegmentSingleLookupTable, segments)
  76
  77 struct SegmentArrayLookupTable : BinarySearchLookupTable
  78 {
  79     LookupSegment segments[ANY_NUMBER];
  80 };
  81 LE_VAR_ARRAY(SegmentArrayLookupTable, segments)
  82
  83 struct SingleTableLookupTable : BinarySearchLookupTable
  84 {
  85     LookupSingle entries[ANY_NUMBER];
  86 };
  87 LE_VAR_ARRAY(SingleTableLookupTable, entries)
  88
  89 struct TrimmedArrayLookupTable : LookupTableBase
  90 {
  91     TTGlyphID   firstGlyph;
  92     TTGlyphID   glyphCount;
  93     LookupValue valueArray[ANY_NUMBER];
  94 };
  95 LE_VAR_ARRAY(TrimmedArrayLookupTable, valueArray)
  96
  97 U_NAMESPACE_END
  98 #endif