/*

* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Triangle filler.

*

*/

#ifndef TMIDTRIANGLEFILLER_H

#define TMIDTRIANGLEFILLER_H

//  INCLUDES

#include <e32def.h>

//  CONSTANTS

const TInt KShift = 8;

//  MACROS

#define FPDIV( x, y ) ( ( ( x ) << KShift ) / ( y ) )

//  CLASS DEFINITION

/**

 * Triangle filler.

 *

 */

NONSHARABLE_CLASS(TMIDTriangleFiller)    // usually not derived

{

public:     // Constructors and destructors

    void Construct(TInt aX1, TInt aY1,

                   TInt aX2, TInt aY2,

                   TInt aX3, TInt aY3);

public:     // New methods

    void GetNextPixelRun(TBool& aExists, TInt& aScanLine,

                         TInt& aStart, TInt& aEnd);

private:    // New methods

    void ConstructNormalCase();

    void ConstructSpecialCaseOne();

    void ConstructSpecialCaseTwo();

    void ConstructSingleLine();

    void SecondHalf();

    inline void SwapPoints(TInt& aX1, TInt& aY1,

                           TInt& aX2, TInt& aY2);

private:    // Data

    TInt iX1;

    TInt iY1;

    TInt iX2;

    TInt iY2;

    TInt iX3;

    TInt iY3;

    TInt iRightDelta;

    TInt iLeftDelta;

    TInt iScanlines;

    TInt iSpanStart;

    TInt iSpanStop;

    TInt iDx12;

    TInt iDx23;

    TInt iDx13;

    TBool iNormalCase;

};

void TMIDTriangleFiller::SwapPoints(TInt& aX1, TInt& aY1,

                                    TInt& aX2, TInt& aY2)

{

    TInt temp(aX1);

    aX1 = aX2;

    aX2 = temp;

    temp = aY1;

    aY1 = aY2;

    aY2 = temp;

};

#endif // TMIDTRIANGLEFILLER_H