Lookups.h revision c73f511526464f8e56c242df80552e9b0d94ae3d 
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
18U_NAMESPACE_BEGIN
19
20enum 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
31struct 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
46struct 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};
55LE_VAR_ARRAY(LookupTable, subTableOffsetArray)
56
57struct 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};
64LE_VAR_ARRAY(LookupListTable, lookupTableOffsetArray)
65
66inline le_int32 LookupSubtable::getGlyphCoverage(const LEReferenceTo<LookupSubtable> &base, LEGlyphID glyphID, LEErrorCode &success) const
67{
68  return getGlyphCoverage(base, coverageTableOffset, glyphID, success);
69}
70
71inline 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
76inline 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
81U_NAMESPACE_END
82#endif
83