/*

 * 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 :

 *

 */

#ifndef TSGRAPHICFILESCALINGHANDLER_H

#define TSGRAPHICFILESCALINGHANDLER_H

#include <e32base.h>

class RFs;

class CImageDecoder;

class CFbsBitmap;

class CBitmapRotator;

class CBitmapScaler;

/**

 * Interface to observer contain

 * ImageReadyCallBack function return error code and scaled/resized bitmap.

 */

class MImageReadyCallBack

    {

public:

    virtual void ImageReadyCallBack( TInt aError, const CFbsBitmap* aBitmap ) = 0;

    };

/**

 * Class to scaling graphic file/s.

 */

class CTsGraphicFileScalingHandler : public CActive

    {

public:

    /**

     * Kind of graphic file scaling.

     * EIgnoreAspectRatio          - the file is scaled to size, aspect ratio isn't preserving.

     * EKeepAspectRatio            - the file is scaled to a rectangle as large as possible inside size

     *                               preserving the aspect ratio.

     * EKeepAspectRatioByExpanding - the file is scaled to a rectangle as small as possible outside size

     *                               preserving the aspect ratio.

     */

    enum TKindOfScaling

        {

        EIgnoreAspectRatio = 0,

        EKeepAspectRatio = 1,

        EKeepAspectRatioByExpanding = 2,

        };

private:

    /**

     * Active object current operation.

     */

    enum TCurrentOperation{

        ENone = 0,

        EConvertBitmapFromFile,

        ERotate,

        EScale

    };

public:

    ~CTsGraphicFileScalingHandler();

    static CTsGraphicFileScalingHandler* NewL(MImageReadyCallBack &aNotify,

        RFs &aFs,

        const TDesC &aFileName,

        const TDesC8& aMimeType,

        const TSize &aNewSize,

        TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio,

        TInt aRotation = 0);

    static CTsGraphicFileScalingHandler* NewLC(MImageReadyCallBack &aNotify,

        RFs &aFs,

        const TDesC &aFileName,

        const TDesC8& aMimeType,

        const TSize &aNewSize,

        TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio,

        TInt aRotation = 0);

    static CTsGraphicFileScalingHandler* NewL(MImageReadyCallBack &aNotify,

        const CFbsBitmap &aInputFbsBitmap,

        const TSize &aNewSize,

        TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio,

        TInt aRotation = 0);

     static CTsGraphicFileScalingHandler* NewLC(MImageReadyCallBack &aNotify,

        const CFbsBitmap &aInputFbsBitmap,

        const TSize &aNewSize,

        TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio,

        TInt aRotation = 0);

protected:

    void DoCancel();

    void RunL();

    TInt RunError(TInt);

private:

    void ConstructL( RFs& aFs, const TDesC& aFileName, const TDesC8& aMimeType );

    void ConstructL( const CFbsBitmap& aInputFbsBitmap );

    CTsGraphicFileScalingHandler( MImageReadyCallBack& aNotify,

                                  const TSize& aNewSize,

        TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio,

        TInt aRotation = 0);

    void DecodingOperationL( RFs& aFs, const TDesC& aFileName, const TDesC8& aMimeType );

    void ScalingOperationL();

    void RotationOperationL();

    TInt RotationMode()const;

    TBool IsSupportedRotationMode() const;

    TSize NewSizeToScalingOperation();

    void FixForDisplayModeNotSupportedByScalingOperation();

private:

    /**

     * Reference to observer implementation - return error code and output bitmap.

     */

    MImageReadyCallBack& iNotify;

    /**

     * Pointer to decoder used by decoding graphic file algorithm.

     */

    CImageDecoder* iImageDecoder;

    /**

     * Pointer to input bitmap - before decoding/scaling operation/s.

     */

    CFbsBitmap* iInputBitmap;

    /**

     * Pointer to output bitmap - returned in mNotify object.

     */

    CFbsBitmap* iOutputBitmap;

    /**

     * Pointer to CBitmapScaler calss used by scaling graphic file algorithm.

     */

    CBitmapScaler* iBitmapScaler;

    CBitmapRotator* iBitmapRotator;

    /**

     * New size of output graphic file.

     */

    TSize iNewSize;

    /**

     * Kind of graphic file scaling described above.

     */

    TBool iKindOfScaling;

    const TInt iRotation;

    /**

     * Active object current operation.

     */

    TCurrentOperation iCurrentOperation;

    };

#endif // TSGRAPHICFILESCALINGHANDLER_H