50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
/*
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* %W% %E%
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*
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* (C) Copyright IBM Corp. 2008-2013 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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#include "GlyphSubstitutionTables.h"
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#include "LookupProcessor.h"
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#include "ExtensionSubtables.h"
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#include "GlyphIterator.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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// read a 32-bit value that might only be 16-bit-aligned in memory
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static inline le_uint32 READ_LONG(le_uint32 code) {
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le_uint16* first = ((le_uint16*)&code);
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le_uint16* second = (((le_uint16*)&code) + 1);
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return (le_uint32)((SWAPW(*first) << 16) + SWAPW(*second));
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}
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// FIXME: should look at the format too... maybe have a sub-class for it?
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le_uint32 ExtensionSubtable::process(const LookupProcessor *lookupProcessor, le_uint16 lookupType,
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GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode& success) const
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{
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const LEReferenceTo<ExtensionSubtable> thisRef(lookupProcessor->getReference(), success); // create a reference to this
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if (LE_FAILURE(success)) {
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return 0;
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}
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le_uint16 elt = SWAPW(extensionLookupType);
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if (elt != lookupType) {
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le_uint32 extOffset = READ_LONG(extensionOffset);
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LEReferenceTo<LookupSubtable> subtable(thisRef, success, extOffset);
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if(LE_SUCCESS(success)) {
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return lookupProcessor->applySubtable(subtable, elt, glyphIterator, fontInstance, success);
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}
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}
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return 0;
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}
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U_NAMESPACE_END
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