/*

 * 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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

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 */

/*

 *

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

 *

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

 * by Jens Herden and Javier Sola for Khmer language

 *

 */

#ifndef __KHMERLAYOUTENGINE_H

#define __KHMERLAYOUTENGINE_H

// #include "LETypes.h"

// #include "LEFontInstance.h"

// #include "LEGlyphFilter.h"

// #include "LayoutEngine.h"

// #include "OpenTypeLayoutEngine.h"

// #include "GlyphSubstitutionTables.h"

// #include "GlyphDefinitionTables.h"

// #include "GlyphPositioningTables.h"

// class MPreFixups;

// class LEGlyphStorage;

/**

 * This class implements OpenType layout for Khmer OpenType fonts, as

 * specified by Microsoft in "Creating and Supporting OpenType Fonts

 * for Khmer Scripts"

 * (http://www.microsoft.com/typography/otspec/indicot/default.htm)

 * TODO: change url

 *

 * This class overrides the characterProcessing method to do Khmer

 * character processing and reordering (See the MS spec. for more

 * details)

 *

 * @internal

 */

class KhmerOpenTypeLayoutEngine : public OpenTypeLayoutEngine

{

public:

    /**

     * This is the main constructor. It constructs an instance of

     * KhmerOpenTypeLayoutEngine for a particular font, script and

     * language. It takes the GSUB table as a parameter since

     * LayoutEngine::layoutEngineFactory has to read the GSUB table to

     * know that it has an Khmer OpenType font.

     *

     * @param fontInstance - the font

     * @param scriptCode - the script

     * @param languageCode - the language

     * @param gsubTable - the GSUB table

     *

     * @see LayoutEngine::layoutEngineFactory

     * @see OpenTypeLayoutEngine

     * @see ScriptAndLangaugeTags.h for script and language codes

     *

     * @internal

     */

    KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance,

        le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags,

        const GlyphSubstitutionTableHeader *gsubTable);

    /**

     * This constructor is used when the font requires a "canned" GSUB

     * table which can't be known until after this constructor has

     * been invoked.

     *

     * @param fontInstance - the font

     * @param scriptCode - the script

     * @param langaugeCode - the language

     *

     * @see OpenTypeLayoutEngine

     * @see ScriptAndLangaugeTags.h for script and language codes

     *

     * @internal

     */

    KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance,

        le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags);

    /**

     * The destructor, virtual for correct polymorphic invocation.

     *

     * @internal

     */

   virtual ~KhmerOpenTypeLayoutEngine();

protected:

    /**

     * This method does Khmer OpenType character processing. It

     * assigns the OpenType feature tags to the characters, and may

     * generate output characters which have been reordered.  It may

     * also split some vowels, resulting in more output characters

     * than input characters.

     *

     * Input parameters:

     * @param chars - the input character context

     * @param offset - the index of the first character to process

     * @param count - the number of characters to process

     * @param max - the number of characters in the input context

     * @param rightToLeft - <code>TRUE</code> if the characters are in

     * a right to left directional run

     * @param glyphStorage - the glyph storage object. The glyph and

     * character index arrays will be set.  the auxillary data array

     * will be set to the feature tags.

     *

     * Output parameters:

     * @param success - set to an error code if the operation fails

     *

     * @return the output character count

     *

     * @internal

     */

    virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset,

        le_int32 count, le_int32 max, le_bool rightToLeft,

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

};

#endif