SubstitutionLookups.cpp revision 85bf2e2fbc60a9f938064abc8127d61da7d19882 
1/*
2 *
3 * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
4 *
5 */
6
7#include "LETypes.h"
8#include "LEFontInstance.h"
9#include "OpenTypeTables.h"
10#include "GlyphSubstitutionTables.h"
11#include "GlyphIterator.h"
12#include "LookupProcessor.h"
13#include "SubstitutionLookups.h"
14#include "CoverageTables.h"
15#include "LESwaps.h"
16
17U_NAMESPACE_BEGIN
18
19/*
20    NOTE: This could be optimized somewhat by keeping track
21    of the previous sequenceIndex in the loop and doing next()
22    or prev() of the delta between that and the current
23    sequenceIndex instead of always resetting to the front.
24*/
25void SubstitutionLookup::applySubstitutionLookups(
26        LookupProcessor *lookupProcessor,
27        SubstitutionLookupRecord *substLookupRecordArray,
28        le_uint16 substCount,
29        GlyphIterator *glyphIterator,
30        const LEFontInstance *fontInstance,
31        le_int32 position,
32        LEErrorCode& success)
33{
34    if (LE_FAILURE(success)) {
35        return;
36    }
37
38    GlyphIterator tempIterator(*glyphIterator);
39
40    for (le_uint16 subst = 0; subst < substCount && LE_SUCCESS(success); subst += 1) {
41        le_uint16 sequenceIndex = SWAPW(substLookupRecordArray[subst].sequenceIndex);
42        le_uint16 lookupListIndex = SWAPW(substLookupRecordArray[subst].lookupListIndex);
43
44        tempIterator.setCurrStreamPosition(position);
45        tempIterator.next(sequenceIndex);
46
47        lookupProcessor->applySingleLookup(lookupListIndex, &tempIterator, fontInstance, success);
48    }
49}
50
51U_NAMESPACE_END
52