fontservices/textshaperplugin/IcuSource/layout/AlternateSubstSubtables.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 12 Mar 2010 15:51:09 +0200
branchRCL_3
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parent 0 1fb32624e06b
permissions -rw-r--r--
Revision: 201009 Kit: 201010
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/*
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 *
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 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
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 *
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 */
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#include "LETypes.h"
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#include "LEGlyphFilter.h"
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#include "OpenTypeTables.h"
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#include "GlyphSubstitutionTables.h"
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#include "AlternateSubstSubtables.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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le_uint32 AlternateSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
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{
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    // NOTE: For now, we'll just pick the first alternative...
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    LEGlyphID glyph = glyphIterator->getCurrGlyphID();
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    le_int32 coverageIndex = getGlyphCoverage(glyph);
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    if (coverageIndex >= 0) {
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        le_uint16 altSetCount = SWAPW(alternateSetCount);
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        if (coverageIndex < altSetCount) {
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            Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]);
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            const AlternateSetTable *alternateSetTable =
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                (const AlternateSetTable *) ((char *) this + alternateSetTableOffset);
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            TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);
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            if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) {
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                glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));
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            }
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            return 1;
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        }
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        // XXXX If we get here, the table's mal-formed...
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    }
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    return 0;
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}
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U_NAMESPACE_END