1/*
2 * %W% %E%
3 *
4 * (C) Copyright IBM Corp. 2008-2011 - 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, le_uint16 lookupType,
27                                      GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const
28{
29    if (LE_FAILURE(success)) {
30        return 0;
31    }
32
33    le_uint16 elt = SWAPW(extensionLookupType);
34
35    if (elt != lookupType) {
36        le_uint32 extOffset = READ_LONG(extensionOffset);
37        LookupSubtable *subtable = (LookupSubtable *) ((char *) this + extOffset);
38
39        return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);
40    }
41
42    return 0;
43}
44
45U_NAMESPACE_END
46