/*

* Copyright (c) 2004-2008 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:  Provides functionality adjust image contrast.

*

*/

#ifndef AKNSRLEFFECTPLUGINCONTRAST_H

#define AKNSRLEFFECTPLUGINCONTRAST_H

//  INCLUDES

#include "AknsRlEffectPlugin.h"

#include <AknsRlEffect.h>

// CONSTANTS

// Effect plugin UID

const TInt KAknsRlEffectPluginContrastUID = 0x10204AE1;

// Constants for parameter names

_LIT( KAknsRlEffectContrastAdjustment, "a" );

// CLASS DECLARATION

/**

* Contrast provides functionality adjust image contrast by blending the

* original image with medium (127) gray image.

*

* @since 2.8

*/

NONSHARABLE_CLASS(CAknsRlEffectPluginContrast):

    public CAknsRlEffectPlugin,

    public MAknsRlEffect

    {

    public: // Constructors and destructor

        /**

        * Default constructor.

        *

        * @since 2.8

        */

        CAknsRlEffectPluginContrast();

        /**

        * Destructor.

        *

        * @since 2.8

        */

        virtual ~CAknsRlEffectPluginContrast();

    public: // Implementation of CAknsEffectPlugin

        TUid EffectUid() const;

        MAknsRlEffect* Effect( const TInt aInterface );

    public: // Implementation of MAknsRlEffect

        void InitializeL();

        void Release();

        void ActivateL( MAknsRlEffectContext* aContext );

        void Deactivate();

        /**

        * Accepted named parameters:

        * - "a", integer, adjustment value.

        *

        * The normal range of adjustment value is [-255, 255]. Value -255

        * produces medium gray image, value 255 produces fully contrasted

        * image. Values outside range [-255, 255] will result in underexposure

        * and overexposure.

        *

        * The default value is 0. With default value the filter produces the

        * original image.

        */

        void SetParametersL( MAknsRlParameterIterator& aParameters );

        /**

        * Supported modes:

        * - EColor64K -> EColor64K

        * - EColor16MU -> EColor16MU

        *

        * Masks are ignored. Target layer and input layer A are both required.

        */

        void GetCapabilities( TAknsRlEffectCaps& aCaps );

        TInt Render( const TAknsRlRenderOpParam& aParam );

    private:

        MAknsRlEffectContext* iContext;

        TInt iAdjustment;

    };

#endif // AKNSRLEFFECTPLUGINCONTRAST_H

// End of File