/*

* Copyright (c) 2009 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:   Helper class for frame rate calculation

*

*/

#ifndef C_ALFFRAMESTAMP_H_

#define C_ALFFRAMESTAMP_H_

NONSHARABLE_CLASS(TFrameStamp)

    {

public:

    TFrameStamp(){};

    TFrameStamp( TUint aFrameIndex )

        { 

        iFrameIndex = aFrameIndex;

        iTime.UniversalTime();

        };

    /*

     * FrameRate

     *

     * Calculates framerate between this and the given frame

     * 

     * @aParam  aStamp  The beginning frame for FPS calculation. 

     *                  This object represents the end frame.

     */

    TReal32 FrameRate(TFrameStamp& aStamp)

        {

        TInt64 delta = iTime.MicroSecondsFrom( aStamp.iTime ).Int64();

#ifdef EKA2

        TReal32 elapsed = delta / 1.0e6;

#else

        TReal32 elapsed = delta.GetTReal() / 1.0e6;

#endif

        TReal32 elapsedFrames = iFrameIndex - aStamp.iFrameIndex; 

        TReal32 fps = 0;

        RDebug::Print(_L("FrameRate - frames %4.2f, elapsed time in microseconds: %4.2f"), elapsedFrames, elapsed);

        if ( elapsed != 0.0 )

            {

            fps = ( elapsedFrames  / elapsed);

            }

        return fps;

        };

private:

    TTime iTime;

    TUint iFrameIndex;

    };

#endif /* C_ALFFRAMESTAMP_H_ */