/*

* Copyright (c) 2004-2006 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:  Scaler for bitmaps.

*

*/

#ifndef CVTENGIMAGESCALER_H

#define CVTENGIMAGESCALER_H

//  INCLUDES

#include "MVtEngImageScaler.h"

#include <cvtimagescaler.h>

// FORWARD DECLARATIONS

class MVtEngScalerObserver;

class CVtImageScaler;

class CVtImageBitmap;

/**

* Image scaler implementation class.

*

*  @lib videoteleng.lib

*  @since Series 60 2.8

*/

NONSHARABLE_CLASS( CVtEngImageScaler ) : public CBase,

    public MVtImageScalerObserver,

    public MVtEngImageScaler

    {

    public: // constructor and destructor

        /**

        * Two-phased constructor.

        * @param aObserver scaling finished callback.

        * @return scaler

        */

        static MVtEngImageScaler* NewL(

            MVtEngScalerObserver& aObserver );

        /**

        * Destructor

        */

        virtual ~CVtEngImageScaler();

    private: // constructor

        /**

        * C++ constructor.

        * @param aObserver scaling finished callback.

        */

        CVtEngImageScaler(

            MVtEngScalerObserver& aObserver );

        /**

        * Symbian constructor that may leave.

        */

        void ConstructL();

    public: // From MVtEngImageScaler.

        /**

        * @see MVtEngImageScaler.

        */

        virtual void ScaleL(

            TInt aSourceIndex );

        /**

        * @see MVtEngImageScaler

        */

        virtual TBool ConfigureL(

            TDisplayMode aDisplayMode,

            TSize aSize, 

            TInt aSourceHandle1,

            TInt aSourceHandle2 );

        /**

        * @see MVtEngImageScaler.

        */

        virtual void Release();

        /**

        * @see MVtEngImageScaler.

        */

        virtual TInt Cancel();

    public: // From MVtImageScalerObserver.

        /**

        * @ see MVtImageScalerObserver.

        */

        virtual void ScalingFinished( TInt aError );

    private:

        /**

        * EFirstBitmap 

        *  Use the first bitmap.

        * ESecondBitmap 

        *  Use the second bitmap.

        */

        enum 

	        {

            EFirstBitmap  = 0,

            ESecondBitmap = 1

            };

        /**

        * Fetches the used scaling method from locally.

        * variated properties, and stores it into iScalingMethod.

        */

        void GetScalingMethodL();

    private:

        // Observer receiving scaled bitmaps.

        MVtEngScalerObserver& iObserver;

        // Actual component doing the scaling.

        CVtImageScaler* iVtScaler;

        // Target bitmaps.

        RPointerArray<CVtImageBitmap> iTargets;

        // Source bitmaps.

        RPointerArray<CVtImageBitmap> iSources;

        // Bitmap index in targets.

        TInt                iTargetBitmapInUse;

        // Display mode.

        TDisplayMode        iMode;

        // Scaled size.

        TSize               iSize;

        // Method of scaling

        CVtImageScaler::TQuality    iScalingMethod;

    };

#endif  // CVTENGIMAGESCALER_H

// End of File