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
16 U_NAMESPACE_BEGIN
17
18 // read a 32-bit value that might only be 16-bit-aligned in memory
READ_LONG(le_uint32 code)19 static 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?
process(const LookupProcessor * lookupProcessor,le_uint16 lookupType,GlyphIterator * glyphIterator,const LEFontInstance * fontInstance,LEErrorCode & success) const26 le_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
45 U_NAMESPACE_END
46