/*

* Copyright (c) 2002 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: 

*     Class CPbkThumbnailManager implementation classes.

*

*/

#ifndef __CPbkThumbnailWriterBase_H__

#define __CPbkThumbnailWriterBase_H__

//  INCLUDES

#include <e32base.h>

#include "CPbkThumbnailManagerImpl.h"

#include "MPbkImageReaderObserver.h"

//  FORWARD DECLARATIONS

class CImageEncoder;

class CBitmapScaler;

class MPbkImageData;

class TPbkImageLoadParameters;

// CLASS DECLARATION

/**

 * Implementation base class for image writers.

 */

NONSHARABLE_CLASS(CPbkThumbnailWriterBase) : 

        public CActive, 

        public MPbkThumbnailWriter,

        public MPbkImageReaderObserver

    {

    protected: // interface

        /**

         * Constructor.

         * @param aObserver thumbnail set observer

         * @param aFieldId Field id of image

         */

        CPbkThumbnailWriterBase(MPbkThumbnailSetObserver& aObserver);

        /**

         * Second phase constructor.

         */

        void ConstructL();

        /**

         * Destructor. Cancels any previously executing read operation and

         * destroys this object.

         */

        ~CPbkThumbnailWriterBase();

    private:  // Abstract interface for derived classes

        /**

         * Creates an image writer for the thumbnail image to store.

         *

         * @return  New image writer object. Caller takes ownership of the 

         *          returned object.

         */

        virtual CImageEncoder* CreateImageWriterL() =0;

        /**

         * Stores image in aImageData as the thumbnail image.

         */

        virtual void StoreImageL(const MPbkImageData& aImageData) =0;

        /**

         * Stores image created with writer returned by CreateImageWriterL().

         * @param aImageWriter image writer

         */

        virtual void StoreImageL(CImageEncoder& aImageWriter) =0;

        /**

         * Returns the image size

         * @return Image size

         */

         virtual TSize ImageSize() const = 0;

    public:  // from MPbkThumbnailWriter

        void StartWriteL(const CFbsBitmap& aBitmap);

        void StartWriteL(const TDesC8& aBuffer);

        void StartWriteL(const TDesC& aFileName);

        void CancelWrite();

    private:  // from MPbkImageReaderObserver

        void ImageReadComplete(CPbkImageReader& aReader, CFbsBitmap* aBitmap);

        void ImageReadFailed(CPbkImageReader& aReader, TInt aError);

        void ImageOpenComplete(CPbkImageReader& aReader);

    protected: // From CActive

        void DoCancel();

    private: // From CActive

        void RunL();

        TInt RunError(TInt aError);

    private:  // Implementation

        void NextState();

        void ExecuteStateL();

        void CheckFormatAndSizeL();

        void ScaleBitmapL();

        void CreateImageL();

        void ConvertToJpegL();

        void StoreImageL();

        void Complete();

        static TInt Complete(TAny* aSelf);

        void SetupReaderParams(TPbkImageLoadParameters& aParams);

    private: // data members

        /// Ref: observer

        MPbkThumbnailSetObserver& iObserver;

        /// Own: current state

        TInt iState;

        /// Own: image reader

        CPbkImageReader* iImageReader;

        /// Own: input image data

        MPbkImageData* iImageData;

        /// Own: bitmap to store

        CFbsBitmap* iBitmap;

        /// Own: bitmap scaler

        CBitmapScaler* iBitmapScaler;

        /// Own: image writer

        CImageEncoder* iImageEncoder;

    };

#endif // __CPbkThumbnailWriterBase_H__

// End of File