/*

* Copyright (c) 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:  Camera Bitmap Scaler class and observer interface.

*

*/

#ifndef CAM_BITMAPSCALER_H

#define CAM_BITMAPSCALER_H

// ===========================================================================

// Included headers

#include <e32std.h>

#include <f32file.h>

// ===========================================================================

// Forward declarations

class CFbsBitmap;

class CBitmapScaler;

// ===========================================================================

// Classes

/**

* Interface for Camera Bitmap Scaler Observers

*/

class MCamBitmapScalerObserver

  {

  public:

    /**

    * Notify observer that the bitmap scaling has finished.

    * @param aStatus Status code describing the success of the operation.

    *        KErrNone if all went as planned.

    * @param aBitmap Scaled bitmap. NULL if errors in scaling.

    */

    virtual void BitmapScaled( TInt aStatus, const CFbsBitmap* aBitmap ) = 0;

  };

/**

* Image Decoder class

*/

class CCamBitmapScaler : public CActive

  {

  // =======================================================

  public:

    /**

    * 2-phase constructor.

    */

    static CCamBitmapScaler* NewL( MCamBitmapScalerObserver& aObserver );

    /**

    * Destructor.

    */

    virtual ~CCamBitmapScaler();

  // -------------------------------------------------------

  // From CActive

  protected: 

    /**

    * Called when Cancel is requested and this AO is active.

    * @see CActive

    */

    virtual void DoCancel();

    /**

    * We get notified of the scaling success by a call to RunL

    * when scaling finishes.

    * @see CActive

    */

    virtual void RunL();

    /**

    * If a leave occurs in RunL, RunError gets called by the 

    * Active Scheduler.

    * @param aError Leave code from RunL.

    * @see CActive

    */

    virtual TInt RunError( TInt aError );

  // -------------------------------------------------------

  public:

    void InitScalingL( const TSize&        aTargetSize,

                       const TDisplayMode& aTargetDisplayMode,

                             TBool         aMaintainAspect );

    void StartScaling( CFbsBitmap& aSourceBitmap );

  private:

    /**

    * 2nd phase constructor.

    */

    void ConstructL();

    /**

    * 1st phase constructor.

    * Cannot leave.

    */

    CCamBitmapScaler( MCamBitmapScalerObserver& aObserver );

  // =======================================================

  // Data

  private:

    MCamBitmapScalerObserver& iObserver;

    CBitmapScaler*            iScaler;

    CFbsBitmap*               iScaledBitmap;

    TBool                     iMaintainAspect;

  // =======================================================

  };

// ===========================================================================

#endif // CAM_BITMAPSCALER_H

// end of file