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 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
29 *
30 */
31
32#include "LETypes.h"
33#include "LEGlyphFilter.h"
34#include "OpenTypeTables.h"
35#include "GlyphSubstitutionTables.h"
36#include "AlternateSubstSubtables.h"
37#include "GlyphIterator.h"
38#include "LESwaps.h"
39
40U_NAMESPACE_BEGIN
41
42le_uint32 AlternateSubstitutionSubtable::process(const LEReferenceTo<AlternateSubstitutionSubtable> &base,
43                                       GlyphIterator *glyphIterator, LEErrorCode &success, const LEGlyphFilter *filter) const
44{
45    // NOTE: For now, we'll just pick the first alternative...
46    LEGlyphID glyph = glyphIterator->getCurrGlyphID();
47    le_int32 coverageIndex = getGlyphCoverage(base, glyph, success);
48
49    if (coverageIndex >= 0 && LE_SUCCESS(success)) {
50        le_uint16 altSetCount = SWAPW(alternateSetCount);
51
52        if (coverageIndex < altSetCount) {
53            Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]);
54            const LEReferenceTo<AlternateSetTable> alternateSetTable(base, success,
55                                  (const AlternateSetTable *) ((char *) this + alternateSetTableOffset));
56            if (!LE_SUCCESS(success)) return 0;
57            TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);
58
59            if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate), success)) {
60                glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));
61            }
62
63            return 1;
64        }
65
66        // XXXX If we get here, the table's mal-formed...
67    }
68
69    return 0;
70}
71
72U_NAMESPACE_END
73