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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/*
*
* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "LEGlyphFilter.h"
#include "OpenTypeTables.h"
#include "GlyphSubstitutionTables.h"
#include "MultipleSubstSubtables.h"
#include "GlyphIterator.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
le_uint32 MultipleSubstitutionSubtable::process(const LETableReference &base, GlyphIterator *glyphIterator, LEErrorCode& success, const LEGlyphFilter *filter) const
{
if (LE_FAILURE(success)) {
return 0;
}
LEGlyphID glyph = glyphIterator->getCurrGlyphID();
// If there's a filter, we only want to do the
// substitution if the *input* glyphs doesn't
// exist.
//
// FIXME: is this always the right thing to do?
// FIXME: should this only be done for a non-zero
// glyphCount?
if (filter != NULL && filter->accept(glyph, success)) {
return 0;
}
if(LE_FAILURE(success)) return 0;
le_int32 coverageIndex = getGlyphCoverage(base, glyph, success);
le_uint16 seqCount = SWAPW(sequenceCount);
LEReferenceToArrayOf<Offset>
sequenceTableOffsetArrayRef(base, success, sequenceTableOffsetArray, seqCount);
if (LE_FAILURE(success)) {
return 0;
}
if (coverageIndex >= 0 && coverageIndex < seqCount) {
Offset sequenceTableOffset = SWAPW(sequenceTableOffsetArray[coverageIndex]);
LEReferenceTo<SequenceTable> sequenceTable(base, success, sequenceTableOffset);
if (LE_FAILURE(success)) {
return 0;
}
le_uint16 glyphCount = SWAPW(sequenceTable->glyphCount);
LEReferenceToArrayOf<Offset>
substituteArrayRef(base, success, sequenceTable->substituteArray, glyphCount);
if (glyphCount == 0) {
glyphIterator->setCurrGlyphID(0xFFFF);
return 1;
} else if (glyphCount == 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[0]);
if (filter != NULL && ! filter->accept(LE_SET_GLYPH(glyph, substitute), success)) {
return 0;
}
glyphIterator->setCurrGlyphID(substitute);
return 1;
} else {
// If there's a filter, make sure all of the output glyphs
// exist.
if (filter != NULL) {
for (le_int32 i = 0; i < glyphCount; i += 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
if (! filter->accept(substitute, success)) {
return 0;
}
}
}
LEGlyphID *newGlyphs = glyphIterator->insertGlyphs(glyphCount, success);
if (LE_FAILURE(success)) {
return 0;
}
le_int32 insert = 0, direction = 1;
if (glyphIterator->isRightToLeft()) {
insert = glyphCount - 1;
direction = -1;
}
for (le_int32 i = 0; i < glyphCount; i += 1) {
TTGlyphID substitute = SWAPW(sequenceTable->substituteArray[i]);
newGlyphs[insert] = LE_SET_GLYPH(glyph, substitute);
insert += direction;
}
return 1;
}
}
return 0;
}
U_NAMESPACE_END
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