// 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:

//

/**

 @file

 @internalTechnology

*/

#ifndef CMTPIMAGEDPTHUMBNAILCREATOR_H

#define CMTPIMAGEDPTHUMBNAILCREATOR_H

// INCLUDES

#include <e32base.h>

#include <thumbnailmanager.h>

#include <thumbnailmanagerobserver.h>

#include <thumbnailobjectsource.h>

#include <thumbnaildata.h>

#include <imageconversion.h>

#include <bitmaptransforms.h>

class CMTPTypeOpaqueData;

#include "mtpdebug.h"

#define MTPTHUMBSCALING

// CLASS DECLARATION

/**

*  A class for reading image related info and creating a thumbnail from 

*  an image.

*

*  @lib ptpstack.lib

*  @since S60 3.2

*/

class CMTPImageDpThumbnailCreator : public CActive, public MThumbnailManagerObserver

    {

public:

    /**

     * Two-phased constructor.

     * @param None.

     * @return An instance of CMTPImageDpThumbnailCreator.

     */

    static CMTPImageDpThumbnailCreator* NewL();

    /**

     * C++ destructor.

     */

    ~CMTPImageDpThumbnailCreator();

public:

    /**

     * Gets a thumbnail from the image.

     * @since S60 3.2

     * @param aSession, Reference to file server.

     * @param aFileName, Name of the image file. Caller must ensure that the referenced object exists until the asynchronous call is completed.

     * @param aThumbName, Name of the thumbnail file to be created. Caller must ensure that the referenced object exists until the asynchronous call is completed.

     * @param aGetThumbnailStatus, status when 

     */

    void GetThumbnailL(const TDesC& aFileName, CMTPTypeOpaqueData& aThumbName, TInt& result);

    void ClearThumbnailData();

    CThumbnailManager*  GetThumbMgr() { return iThumbMgr;}

private: // From MThumbnailManagerObserver

    void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail, TThumbnailRequestId aId );

    void ThumbnailPreviewReady( MThumbnailData& aThumbnail, TThumbnailRequestId aId );

private: // From CActive

    void DoCancel();

    void RunL();

    TInt RunError(TInt aError);    

private:

    void EncodeImageL();    

    /**

     * Scales the image as a thumbnail size.

     * @since S60 3.2

     * @param None.

     * @return None.

     */

#ifdef MTPTHUMBSCALING

    void ScaleBitmap();

#endif

    void QueueThumbCreationL( const TDesC& aFileName );

    void CreateThumbL(const TDesC& aFileName );

    void GetThumbL(const TDesC& aFileName);

private:

    /**

     * Default C++ constructor. Not used.

     */

    CMTPImageDpThumbnailCreator();

    /**

     * 2nd phase constructor.

     */

    void ConstructL();

private:

    /**

    FLOGGER debug trace member variable.

    **/

    __FLOG_DECLARATION_MEMBER_MUTABLE;

    enum{

        EIdle,

        EGetting,

        EGetted,

        EScaling,

        EEncoding}          iState;

    TThumbnailRequestId     iCurrentReq;

    TInt*                   iCreationErr;

    CFbsBitmap*             iBitmap;

    CImageEncoder*          iImgEnc;

#ifdef MTPTHUMBSCALING

    CBitmapScaler*          iScaler;

#endif

    HBufC8*                 iData;

    CThumbnailManager*      iThumbMgr;

    CThumbnailObjectSource* iObjectSource;

    CMTPTypeOpaqueData*     iBuffer;             //not owned

    CActiveSchedulerWait*   iActiveSchedulerWait;

    };

#endif // CMTPIMAGEDPTHUMBNAILCREATOR_H