/*

* 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:    Task to generate a cropped thumbnail for a JPEG image.

*

*/

/**

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

 */

#ifndef C_GLXTNZOOMEDIMAGETASK_H

#define C_GLXTNZOOMEDIMAGETASK_H

#include "glxtntask.h"

#include <glxthumbnailinfo.h>   // For TGlxThumbnailFilter

class CGlxtnFileInfo;

class CGlxtnFileUtility;

class TGlxThumbnailRequest;

class CFbsBitmap;

class CExtJpegDecoder;

/**

 * Task to generate a cropped thumbnail for a JPEG image.

 *

 * @ingroup glx_thumbnail_creator

 */

NONSHARABLE_CLASS(CGlxtnZoomedImageTask) : public CGlxtnClientTask

    {

public:

    /**

    * Two-phased constructor.

    */

	static CGlxtnZoomedImageTask* NewL(

	    const TGlxThumbnailRequest& aRequestInfo,

	    CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);

	~CGlxtnZoomedImageTask();

protected:  // From CGlxtnTask

    virtual TBool DoStartL(TRequestStatus& aStatus);

	virtual void DoCancel();

	virtual TBool DoRunL(TRequestStatus& aStatus);

    TBool DoRunError(TInt aError);

private:

    CGlxtnZoomedImageTask(const TGlxThumbnailRequest& aRequestInfo,

        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);

	void ConstructL(TInt aBitmapHandle);

    void DecodePartialImageL(TRequestStatus& aStatus);

    void CreateDecoderL(TInt aDecoderType);

private:

    enum TTaskState

        {

        EStateFetchingUri, EStateDecoding, EStateProcessing

        };

    /** File utility (not owned) */

    CGlxtnFileUtility& iFileUtility;

    /** File information for item to thumbnail */

    CGlxtnFileInfo* iInfo;

	/** Current state for task state machine */

    TTaskState iState;

    /** Bitmap for the generated thumbnail */

    CFbsBitmap* iThumbnail;

    /** Decoder for the JPEG file */

    CExtJpegDecoder* iDecoder;

    /** Requested thumbnail size */

    TSize iRequestedSize;

    /** Part of image to keep */

    TRect iCroppingRect;

    /** Filtering to apply to generated image */

    TGlxThumbnailFilter iFilter;

    /** DRM allowed flag passed from thumbnail request */

    TBool iDrmAllowed;

    /** Whether current file is DRM protected */

    TBool iProtected;

    };

#endif  // C_GLXTNZOOMEDIMAGETASK_H