/*

* Copyright (c) 2005 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:

*

*/

#include <e32std.h>

#include "lcdgdrvutil.h"

/**

 * Calculate rational increment stepping in positive y direction.

 *

 *@param aDx difference in x coordinates of edge end points

 *@param aDy difference in y coordinates of edge end points, always positive (y sorted vertices)

 *@return aIx integer increment

 *@return aIf positive fractional increment with denominator aDy

 *

 */

void Increment(TInt& aIx, TInt& aIf, TInt aDx, TInt aDy)

{

    ASSERT(aDy > 0);

    TInt ip = aDx / aDy;

    TInt fp = aDx % aDy;

    if (fp < 0)

    {

        aIx = ip - 1;

        aIf = fp + aDy;

    }

    else

    {

        aIx = ip;

        aIf = fp;

    }

}

void Increment(TInt64& aIx, TInt64& aIf, TInt64 aDx, TInt64 aDy)

{

    ASSERT(aDy > 0);

    TInt64 ip = aDx / aDy;

    TInt64 fp = aDx % aDy;

    if (fp < 0)

    {

        aIx = ip - 1;

        aIf = fp + aDy;

    }

    else

    {

        aIx = ip;

        aIf = fp;

    }

}