1/*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.  Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26/*
27 *
28 *
29 * (C) Copyright IBM Corp. 1998-2006 - All Rights Reserved
30 *
31 */
32
33#include "LETypes.h"
34#include "LEGlyphFilter.h"
35#include "OpenTypeTables.h"
36#include "GlyphSubstitutionTables.h"
37#include "LigatureSubstSubtables.h"
38#include "GlyphIterator.h"
39#include "LESwaps.h"
40
41U_NAMESPACE_BEGIN
42
43le_uint32 LigatureSubstitutionSubtable::process(const LETableReference &base, GlyphIterator *glyphIterator, LEErrorCode &success, const LEGlyphFilter *filter) const
44{
45    LEGlyphID glyph = glyphIterator->getCurrGlyphID();
46    le_int32 coverageIndex = getGlyphCoverage(base, glyph, success);
47
48    if (LE_FAILURE(success)) {
49      return 0;
50    }
51
52    LEReferenceToArrayOf<Offset> ligSetTableOffsetArrayRef(base, success, ligSetTableOffsetArray, SWAPW(ligSetCount));
53
54    if (coverageIndex >= 0 && LE_SUCCESS(success) && (le_uint32)coverageIndex < ligSetTableOffsetArrayRef.getCount()) {
55        Offset ligSetTableOffset = SWAPW(ligSetTableOffsetArray[coverageIndex]);
56        LEReferenceTo<LigatureSetTable>   ligSetTable(base, success, ligSetTableOffset);
57
58        if( LE_FAILURE(success) ) { return 0; }
59        le_uint16 ligCount = SWAPW(ligSetTable->ligatureCount);
60
61        LEReferenceToArrayOf<Offset> ligatureTableOffsetArray(base, success, ligSetTable->ligatureTableOffsetArray, ligCount);
62        for (le_uint16 lig = 0; LE_SUCCESS(success) && lig < ligCount; lig += 1) {
63            Offset ligTableOffset = SWAPW(ligSetTable->ligatureTableOffsetArray[lig]);
64            LEReferenceTo<LigatureTable>   ligTable(ligSetTable, success, ligTableOffset);
65            if(LE_FAILURE(success)) { return 0; }
66            le_uint16 compCount = SWAPW(ligTable->compCount) - 1;
67            LEReferenceToArrayOf<TTGlyphID>
68                componentArrayRef(base, success, ligTable->componentArray, compCount);
69            if (LE_FAILURE(success)) { return 0; }
70            le_int32 startPosition = glyphIterator->getCurrStreamPosition();
71            TTGlyphID ligGlyph = SWAPW(ligTable->ligGlyph);
72            le_uint16 comp;
73
74            for (comp = 0; comp < compCount; comp += 1) {
75                if (! glyphIterator->next()) {
76                    break;
77                }
78
79                if (LE_GET_GLYPH(glyphIterator->getCurrGlyphID()) != SWAPW(ligTable->componentArray[comp])) {
80                    break;
81                }
82            }
83
84            if (comp == compCount && (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, ligGlyph), success))) {
85                GlyphIterator tempIterator(*glyphIterator);
86                TTGlyphID deletedGlyph = tempIterator.ignoresMarks()? 0xFFFE : 0xFFFF;
87
88                while (comp > 0) {
89                    tempIterator.setCurrGlyphID(deletedGlyph);
90                    tempIterator.prev();
91
92                    comp -= 1;
93                }
94
95                tempIterator.setCurrGlyphID(ligGlyph);
96
97                return compCount + 1;
98            }
99
100            glyphIterator->setCurrStreamPosition(startPosition);
101        }
102
103    }
104
105    return 0;
106}
107
108U_NAMESPACE_END
109