/*

 *

 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved

 *

 */

#ifndef __ARABICSHAPING_H

#define __ARABICSHAPING_H

/**

 * \file

 * \internal

 */

#include "LETypes.h"

#include "OpenTypeTables.h"

U_NAMESPACE_BEGIN

class LEGlyphStorage;

class ArabicShaping /* not : public UObject because all methods are static */ {

public:

    // shaping bit masks

    enum ShapingBitMasks

    {

        MASK_SHAPE_RIGHT    = 1, // if this bit set, shapes to right

        MASK_SHAPE_LEFT     = 2, // if this bit set, shapes to left

        MASK_TRANSPARENT    = 4, // if this bit set, is transparent (ignore other bits)

        MASK_NOSHAPE        = 8  // if this bit set, don't shape this char, i.e. tatweel

    };

    // shaping values

    enum ShapeTypeValues

    {

        ST_NONE         = 0,

        ST_RIGHT        = MASK_SHAPE_RIGHT,

        ST_LEFT         = MASK_SHAPE_LEFT,

        ST_DUAL         = MASK_SHAPE_RIGHT | MASK_SHAPE_LEFT,

        ST_TRANSPARENT  = MASK_TRANSPARENT,

        ST_NOSHAPE_DUAL = MASK_NOSHAPE | ST_DUAL,

        ST_NOSHAPE_NONE = MASK_NOSHAPE

    };

    typedef le_int32 ShapeType;

    static void shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,

                      le_bool rightToLeft, LEGlyphStorage &glyphStorage);

    static const LETag *getFeatureOrder();

private:

    // forbid instantiation

    ArabicShaping();

    static const LETag tagArray[];

    static ShapeType getShapeType(LEUnicode c);

    static const ShapeType shapeTypes[];

    static void adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage); 

};

U_NAMESPACE_END

#endif