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      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
     97