/*

* Copyright (c) 2004 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:    Image Transforms subsystem.

*

*/

#ifndef CVTIMAGEROTATORIMPL_H

#define CVTIMAGEROTATORIMPL_H

// INCLUDE FILES

#include "cvtimagerotator.h"

// FORWARD DECLARATIONS

class CVtImage;

// CLASS DECLARATIONS

/**

*  Image scaler implementation.

*

*  @lib videosource.lib

*/

class CVtImageRotatorImpl : public CBase

    {

    public:

        /**

        * Sets scaler params.

        * @param "aParams" Scaling params, including source and target images.

        * @exception In error situation leaves with one of the system wide

        * error codes.

        */

        void SetSourceTargetL( const CVtImage& aSource, CVtImage& aTarget );

        /**

        * Method to check whether bitmap heap locking is needed or not during

        * scaling process.

        * @exception In error situation leaves with one of the system wide

        * error codes.

        * @return ETrue if bitmap heap lock is needed, EFalse otherwise.

        */

        TBool NeedHeapLock() const;

        /**

        * Pure virtual rotation method.

        * @param "aContinue" When method returns, this parameter will contain

        * ETrue if new call is needed (i.e. scaling is not yet finished) or

        * EFalse if scaling is complete.

        * @return KErrNone or one of the system wide error codes.

        */

        virtual TInt Rotate( TBool& aContinue ) = 0;

        /**

        * Pure virtual method for checking specific rotation angle support.

        * @param "aAngle" Rotation type that will be needed.

        * @return ETrue if aAngle is one of the supported rotation types

        * EFalse otherwise.

        */

        virtual TBool SupportsRotationAngle( const CVtImageRotator::TRotationAngle& aAngle ) = 0;

        /**

        * Sets rotation angle to be used.

        * @param "aAngle" Rotation type that will be needed.

        */

        void SetAngle( const CVtImageRotator::TRotationAngle& aAngle );

    protected:

        /**

        * C++ constructor.

        * @param "aAngle" Rotation type that will be needed.

        */

        CVtImageRotatorImpl( const CVtImageRotator::TRotationAngle& aAngle );

    private:

        /**

        * Pure virtual source and target image validation method.

        * @param "aSource" Constant reference to source image.

        * @param "aTarget" Constant reference to target image.

        * @exception If source or target is not valid, this method leaves

        * with KErrNotSupported.

        */

        virtual void ValidateSourceTargetL(

            const CVtImage& aSource,

            CVtImage& aTarget ) = 0;

    protected:

        // Source for scaling

        const CVtImage* iSource; // not owned

        // Target image (will hold scaled source)

        CVtImage* iTarget; // not owned

        // Selected rotation angle

        CVtImageRotator::TRotationAngle iAngle;

    };

#endif // CVTIMAGEROTATORIMPL_H

// End of File