/*

* 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:   Thumbnail background generation task implementation

*

*/

/**

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

 */

#ifndef GLXTNBACKGROUNDGENERATIONTASK_H

#define GLXTNBACKGROUNDGENERATIONTASK_H

// INCLUDES

#include "glxtnsavethumbnailtask.h"

#include <glxsettingsmodel.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class CGlxtnFileUtility;

class CGlxtnImageUtility;

class CGlxtnVideoUtility;

// CLASS DECLARATION

/**

* Background task to generate a thumbnail.

*

* @author Dan Rhodes

* @ingroup glx_thumbnail_creator

*/

NONSHARABLE_CLASS(CGlxtnBackgroundGenerationTask) : public CGlxtnSaveThumbnailTask

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param iItemId Media ID of item to thumbnail.

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

        * @param aClient Client initiating the request.

        */

        static CGlxtnBackgroundGenerationTask* NewL(

                    const TGlxMediaId& iItemId, CGlxtnFileUtility& aFileUtility,

                    MGlxtnThumbnailCreatorClient& aClient, 

                    CGlxSettingsModel::TSupportedOrientations aSupportedOrientations);

        /**

        * Destructor.

        */

        virtual ~CGlxtnBackgroundGenerationTask();

    private:    // From CGlxtnTask

        TBool DoStartL(TRequestStatus& aStatus);

    	void DoCancel(); 

    	TBool DoRunL(TRequestStatus& aStatus);

        TBool DoRunError(TInt aError);

    private:

        /**

        * C++ default constructor.

        * @param iItemId Media ID of item to thumbnail.

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

        * @param aClient Client initiating the request.

        */

        CGlxtnBackgroundGenerationTask(const TGlxMediaId& iItemId,

                                    CGlxtnFileUtility& aFileUtility,

                                    MGlxtnThumbnailCreatorClient& aClient, 

                    CGlxSettingsModel::TSupportedOrientations aSupportedOrientations);

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /**

        * Check whether next size already exists or needs to be generated.

        * @param aStatus Request status for the asynchronous operation.

        * @return ETrue if the task has issued an asyncronous request.

        */

        TBool CheckNextL(TRequestStatus& aStatus);

        /**

        * Create the next size to be generated.

        * @param aStatus Request status for the asynchronous operation.

        * @return ETrue if the task has issued an asyncronous request.

        */

        TBool ProcessNextL(TRequestStatus& aStatus);

        /**

        * Filter the thumbnail for the next required size.

        * @param aStatus Request status for the asynchronous operation.

        */

        void FilterThumbnailL(TRequestStatus& aStatus);

        /**

        * Scale the thumbnail to the next required size.

        * @param aStatus Request status for the asynchronous operation.

        */

        void ScaleThumbnailL(TRequestStatus& aStatus);

        /**

        * Decode the image for the required size.

        * @param aStatus Request status for the asynchronous operation.

        */

        void DecodeImageL(TRequestStatus& aStatus);

    private:    // Data

        /** Pointer to client, or NULL after client goes away */

        MGlxtnThumbnailCreatorClient* iClient;

        /** File utility */

        CGlxtnFileUtility& iFileUtility;

        /** Array of sizes to check if need to generate */

        RArray<TSize> iSizes;

        /** Array of sizes to generate */

        RArray<TSize> iTodoSizes;

        /** Utility to get thumbnail from image */

        CGlxtnImageUtility* iImageUtility;

        /** Utility to get thumbnail from video */

        CGlxtnVideoUtility* iVideoUtility;

        /** Image loaded from file */

        CFbsBitmap* iImage;

       /** Image loaded from file */

        CFbsBitmap* iFilteredImage;

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

        TBool iBadFileMarkerNotNeededFlag;

        /** Flag to show whether image has been decoded yet **/

        TBool iImageDecoded;

        /** Flag to show which orientations are supported **/

        CGlxSettingsModel::TSupportedOrientations iSupportedOrientations;

    };

#endif  // GLXTNBACKGROUNDGENERATIONTASK_H

// End of File