/*

* Copyright (c) 2008-2009 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:   Classes for thumbnail-related tasks.

*

*/

/**

 * @internal reviewed 30/07/2007 by Simon Brooks

 */

#ifndef C_GLXTNGENERATETHUMBNAILTASK_H

#define C_GLXTNGENERATETHUMBNAILTASK_H

#include "glxtnloadthumbnailtask.h"

class CGlxtnFileInfo;

class CGlxtnFileUtility;

class CGlxtnImageUtility;

class CGlxtnVideoUtility;

class CFbsBitmap;

class CImageDecoder;

class RFs;

/**

 * Task to generate a high quality thumbnail for a media item.

 *

 * An instance of CImageDecoder is constructed to produce a bitmap from the

 * image file, scaling to the smallest possible size not smaller than the

 * required size.

 *

 * The task then uses ADIS to scale to the exact size required, and also uses

 * the sharpening and IETD algorithms to enhance the image.

 *

 * @ingroup glx_thumbnail_creator

 */

NONSHARABLE_CLASS( CGlxtnGenerateThumbnailTask )

        : public CGlxtnLoadThumbnailTask

    {

public:

    /**

    * Two-phased constructor.

    * @param aRequestInfo Parameters for the thumbnail request.

    * @param aFileUtility File utility for use by the task.

    * @param aClient Client initiating the request.

    */

	static CGlxtnGenerateThumbnailTask* NewL(

	    const TGlxThumbnailRequest& aRequestInfo,

	    CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);

    /**

    * Destructor.

    */

	~CGlxtnGenerateThumbnailTask();

protected:  // From CGlxtnTask

    void SetManager(CGlxtnTaskManager* aManager);

    virtual TBool DoStartL(TRequestStatus& aStatus);

	virtual void DoCancel();

	virtual TBool DoRunL(TRequestStatus& aStatus); 

    TBool DoRunError(TInt aError);

private:

    /**

    * C++ default constructor.

    * @param aRequestInfo Parameters for the thumbnail request.

    * @param aFileUtility File utility for use by the task.

    * @param aClient Client initiating the request.

    */

    CGlxtnGenerateThumbnailTask(const TGlxThumbnailRequest& aRequestInfo,

        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);

    /**

    * Symbian 2nd phase constructor.

    * @param aBitmapHandle Handle to bitmap in which to store the thumbnail.

    */

	void ConstructL(TInt aBitmapHandle);

    /**

    * Start asynchronous decoding process for a high quality thumbnail.

    * @param aStatus Request status for the asynchronous operation.

    */

    void HighQualityDecodeL( TRequestStatus& aStatus );

    /**

    * @return ETrue if viewing the requested thumbnail size would require

    *       DRM rights.

    */

    TBool SizeRequiresDrmRights();

private:

    /** Pointer to task manager (not owned) */

    CGlxtnTaskManager* iTaskManager;

    /** Utility to get thumbnail from image (owned) */

    CGlxtnImageUtility* iImageUtility;

    /** Utility to get thumbnail from video (owned) */

    CGlxtnVideoUtility* iVideoUtility;

    /** Image loaded from file (owned) */

    CFbsBitmap* iImage;

    /** Whether current item is a video */

    TBool iVideo;

    /** Whether current file is DRM protected */

    TBool iProtected;

    /** Flag to show BadFileMarker not created so no need to delete **/

    TBool iBadFileMarkerNotNeededFlag;

    };

#endif // C_GLXTNGENERATETHUMBNAILTASK_H