1/*
2 * %W% %E%
3 *
4 * (C) Copyright IBM Corp. 2008-2013 - All Rights Reserved
5 *
6 */
7
8#include "LETypes.h"
9#include "OpenTypeTables.h"
10#include "GlyphSubstitutionTables.h"
11#include "LookupProcessor.h"
12#include "ExtensionSubtables.h"
13#include "GlyphIterator.h"
14#include "LESwaps.h"
15
16U_NAMESPACE_BEGIN
17
18// read a 32-bit value that might only be 16-bit-aligned in memory
19static inline le_uint32 READ_LONG(le_uint32 code) {
20    le_uint16* first = ((le_uint16*)&code);
21    le_uint16* second = (((le_uint16*)&code) + 1);
22    return (le_uint32)((SWAPW(*first) << 16) + SWAPW(*second));
23}
24
25// FIXME: should look at the format too... maybe have a sub-class for it?
26le_uint32 ExtensionSubtable::process(const LookupProcessor *lookupProcessor, const LETableReference &base, le_uint16 lookupType,  // Google patch: add base
27                                      GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const
28{
29    // Google patch: remove thisRef
30    if (LE_FAILURE(success)) {
31        return 0;
32    }
33
34    le_uint16 elt = SWAPW(extensionLookupType);
35
36    if (elt != lookupType) {
37        le_uint32 extOffset = READ_LONG(extensionOffset);
38        LEReferenceTo<LookupSubtable> subtable(base, success, extOffset);  // Google patch: s/thisRef/base/
39
40        if(LE_SUCCESS(success)) {
41          return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);
42        }
43    }
44
45    return 0;
46}
47
48U_NAMESPACE_END
49