/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 *

 */

/*

 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved

 *

 * This file is a modification of the ICU file IndicLayoutEngine.cpp

 * by Jens Herden and Javier Sola for Khmer language

 *

 */

#include "OpenTypeLayoutEngine.h"

#include "KhmerLayoutEngine.h"

#include "LEGlyphStorage.h"

#include "KhmerReordering.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)

KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

                    le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)

    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)

{

    fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);

    fFeatureOrder = TRUE;

}

KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

                                                     le_int32 typoFlags)

    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)

{

    fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);

    fFeatureOrder = TRUE;

}

KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()

{

    // nothing to do

}

// Input: characters

// Output: characters, char indices, tags

// Returns: output character count

le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,

        LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)

{

    if (LE_FAILURE(success)) {

        return 0;

    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {

        success = LE_ILLEGAL_ARGUMENT_ERROR;

        return 0;

    }

    le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough

    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    if (outChars == NULL) {

        success = LE_MEMORY_ALLOCATION_ERROR;

        return 0;

    }

    glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);

    glyphStorage.allocateAuxData(success);

    if (LE_FAILURE(success)) {

        LE_DELETE_ARRAY(outChars);

        return 0;

    }

    // NOTE: assumes this allocates featureTags...

    // (probably better than doing the worst case stuff here...)

    le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);

    glyphStorage.adoptGlyphCount(outCharCount);

    return outCharCount;

}

U_NAMESPACE_END