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      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
     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?
     26 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