/*

* 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:  Inverts bitmap channels.

*

*/

#ifndef AKNSRLEFFECTPLUGININVERT_H

#define AKNSRLEFFECTPLUGININVERT_H

//  INCLUDES

#include "AknsRlEffectPlugin.h"

#include <AknsRlEffect.h>

// CONSTANTS

// Effect plugin UID

const TInt KAknsRlEffectPluginInvertUID = 0x10204AE4;

// Constants for parameter names

_LIT( KAknsRlEffectInvertChannels, "c" );

_LIT( KAknsRlEffectInvertBlendFactor, "f" );

// CLASS DECLARATION

/**

* Invert provides functionality for inverting bitmap channels. Inverting can be

* controlled per channel basis (e.g. invert only the red channel).

*

* @since 2.8

*/

NONSHARABLE_CLASS(CAknsRlEffectPluginInvert):

    public CAknsRlEffectPlugin,

    public MAknsRlEffect

    {

    public:

        /**

        * Constants for constructing the channel bitmask.

        */

        enum TBitmask

            {

            EMaskR = 0x01,

            EMaskG = 0x02,

            EMaskB = 0x04

            };

    public: // Constructors and destructor

        /**

        * Default constructor.

        *

        * @since 2.8

        */

        CAknsRlEffectPluginInvert();

        /**

        * Destructor.

        *

        * @since 2.8

        */

        virtual ~CAknsRlEffectPluginInvert();

    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:

        * - "c", integer, selected channels

        * - "f", integer, normal range [0, 255], blend factor.

        *

        * Selected channels:

        * A bitmask that defines the inverted channels. The channel bits are:

        * - 001 red

        * - 010 green

        * - 100 blue

        * All combinations are supported. The bitmask can be constructed by

        * orring the TBitmask enumerations. Any extra bit on parameter is

        * ignored. Selected channels parameter is ignored on Gray256 -> Gray256

        * operations.

        *

        * Blend factor:

        * Blend factor controls the resulting opacity of the applied effect.

        * Normal value range is [0, 255] but values outside will also work.

        * - Value 0 will result in the original image.

        * - Value 255 will result in the filtered image.

        * - Values outside range [0, 255] will result in underexposure or

        *   overexposure.

        *

        * The default parameter values are:

        * - "c" = 7 (111, all channels are inverted)

        * - "f" = 255, full filter opacity

        */

        void SetParametersL( MAknsRlParameterIterator& aParameters );

        /**

        * Supported modes:

        * - EColor64K -> EColor64K

        * - EColor16MU -> EColor16MU

        * - EGray256 -> EGray256

        *

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

        */

        void GetCapabilities( TAknsRlEffectCaps& aCaps );

        TInt Render( const TAknsRlRenderOpParam& aParam );

    private:

        MAknsRlEffectContext* iContext;

        TUint8 iChannelMask;

        TInt iBlendFactor;

    };

#endif // AKNSRLEFFECTPLUGININVERT_H

// End of File