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. 2002 - All Rights Reserved
30 *
31 */
32
33#include "LETypes.h"
34#include "OpenTypeTables.h"
35#include "GlyphSubstitutionTables.h"
36#include "LookupProcessor.h"
37#include "ExtensionSubtables.h"
38#include "GlyphIterator.h"
39#include "LESwaps.h"
40
41U_NAMESPACE_BEGIN
42
43// read a 32-bit value that might only be 16-bit-aligned in memory
44#define READ_LONG(code) (le_uint32)((SWAPW(*(le_uint16*)&code) << 16) + SWAPW(*(((le_uint16*)&code) + 1)))
45
46// FIXME: should look at the format too... maybe have a sub-class for it?
47le_uint32 ExtensionSubtable::process(const LEReferenceTo<ExtensionSubtable> &thisRef,
48                                     const LookupProcessor *lookupProcessor, le_uint16 lookupType,
49                                      GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const
50{
51    if (LE_FAILURE(success)) {
52        return 0;
53    }
54
55    le_uint16 elt = SWAPW(extensionLookupType);
56
57    if (elt != lookupType) {
58        le_uint32 extOffset = READ_LONG(extensionOffset);
59        LEReferenceTo<LookupSubtable> subtable(thisRef, success,  extOffset);
60
61        if(LE_SUCCESS(success)) {
62          return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);
63        }
64    }
65
66    return 0;
67}
68
69U_NAMESPACE_END
70