/*

* 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:  Grayscales images.

*

*/

// INCLUDE FILES

#include "AknsRlEffectPluginGrayscale.h"

#include "AknsRlEffectUtil.h"

// =============== TEMPLATE IMPS. OF GRAYSCALE =================================

/**

* Template implementation of Grayscale. Type defines the used data type for

* iterating over the bitmap data. X, R, G and B define the used pixel color bit

* layout.

*/

template<class Type,TInt X, TInt R, TInt G, TInt B>

class AknsRlEffectGrayscale

    {

    public:

    //------------------------------------------------------------------------

    static void ProcessRgbToRgb( const CFbsBitmap& aTarget,

                                 const CFbsBitmap& aSource,

                                 const TInt aMin,

                                 const TInt aMax,

                                 const TInt aBlendFactor )

        {

        // ScanLineLength returns bytes, but width must match the Type

        TInt width = CFbsBitmap::ScanLineLength( aSource.SizeInPixels().iWidth,

                                                 aSource.DisplayMode() ) / sizeof(Type);

        TInt height = aSource.SizeInPixels().iHeight;

        TInt pixelCount = width * height;

        TInt shade;

        TInt r,g,b;

        aTarget.LockHeap( ETrue ); // Lock the global bitmap heap

        Type* dataT = reinterpret_cast<Type*>( aTarget.DataAddress() );

        Type* dataS = reinterpret_cast<Type*>( aSource.DataAddress() );

        for( TInt index = 0; index < pixelCount; ++index )

            {

            r = AknsRlRgb<Type,X,R,G,B>::R8(*dataS);

            g = AknsRlRgb<Type,X,R,G,B>::G8(*dataS);

            b = AknsRlRgb<Type,X,R,G,B>::B8(*dataS);

            shade = AknsRlUtil::Grayscale( TUint8(r), TUint8(g), TUint8(b) );

            // Scale the shade to range [aMin, aMax], note that

            // (aMax - aMin) * shade is always >= 0

            shade = aMin + ( ((aMax - aMin) * shade) >> 8 );

            // Exposure blending

            // Note: It is assumed that arithmetic shifting is supported

            // -> negative values are shifted correctly

            r = ( shade * aBlendFactor + (255 - aBlendFactor) * r ) >> 8;

            g = ( shade * aBlendFactor + (255 - aBlendFactor) * g ) >> 8;

            b = ( shade * aBlendFactor + (255 - aBlendFactor) * b ) >> 8;

            if( r < 0 ) r = 0; else if( r > 255 ) r = 255;

            if( g < 0 ) g = 0; else if( g > 255 ) g = 255;

            if( b < 0 ) b = 0; else if( b > 255 ) b = 255;

            AknsRlRgb<Type,X,R,G,B>::SetRgb8( dataT, TUint8(r), TUint8(g), TUint8(b) );

            dataT++;

            dataS++;

            }

        aTarget.UnlockHeap( ETrue ); // Unlock the global bitmap heap

        }

    //------------------------------------------------------------------------

    static void ProcessRgbToGray( const CFbsBitmap& aTarget,

                                  const CFbsBitmap& aSource,

                                  const TInt aMin,

                                  const TInt aMax )

        {

        TInt width  = aSource.SizeInPixels().iWidth;

        TInt height = aSource.SizeInPixels().iHeight;

        // ScanLineLength returns bytes, but width must match the Type

        TInt scanT  = CFbsBitmap::ScanLineLength(width, aTarget.DisplayMode());

        TInt scanS  = CFbsBitmap::ScanLineLength(width, aSource.DisplayMode()) / sizeof(Type);

        TInt shade;

        TInt pitchT = scanT - width;

        TInt pitchS = scanS - width;

        aTarget.LockHeap( ETrue ); // Lock the global bitmap heap

        TUint8* dataT = reinterpret_cast<TUint8*>( aTarget.DataAddress() );

        Type* dataS = reinterpret_cast<Type*>( aSource.DataAddress() );

        TInt x, y;

        for( y=0; y < height; y++ )

            {

            for( x=0; x < width; x++ )

                {

                shade = AknsRlUtil::Grayscale( AknsRlRgb<Type,X,R,G,B>::R8(*dataS),

                                               AknsRlRgb<Type,X,R,G,B>::G8(*dataS),

                                               AknsRlRgb<Type,X,R,G,B>::B8(*dataS) );

                // Scale the shade to range [aMin, aMax], note that

                // (aMax - aMin) * shade is always >= 0

                *dataT = TUint8( aMin + ( ((aMax - aMin) * shade) >> 8 ) );

                dataT++;

                dataS++;

                }

            dataT = dataT + pitchT;

            dataS = dataS + pitchS;

            }

        aTarget.UnlockHeap( ETrue ); // Unlock the global bitmap heap

        }

    }; // End of AknsRlGrayscale

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::CAknsRlEffectPluginGrayscale

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CAknsRlEffectPluginGrayscale::CAknsRlEffectPluginGrayscale()

    {

    }

// -----------------------------------------------------------------------------

// Destructor

// -----------------------------------------------------------------------------

//

CAknsRlEffectPluginGrayscale::~CAknsRlEffectPluginGrayscale()

    {

    iContext = NULL; // Removes lint nag

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::EffectUid

// -----------------------------------------------------------------------------

//

TUid CAknsRlEffectPluginGrayscale::EffectUid() const

    {

    return TUid::Uid( KAknsRlEffectPluginGrayscaleUID );

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::Effect

// -----------------------------------------------------------------------------

//

MAknsRlEffect* CAknsRlEffectPluginGrayscale::Effect( const TInt aInterface )

    {

    if( aInterface == KAknsRlEffectPluginInterfaceEffect )

        return this;

    return NULL;

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::InitializeL

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::InitializeL()

    {

    iContext = NULL;

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::Release

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::Release()

    {

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::ActivateL

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::ActivateL( MAknsRlEffectContext* aContext )

    {

    if( !aContext ) // We absolutely need the context

        {

        User::Leave( KErrArgument );

        }

    iContext = aContext;

    iGrayMin = 0;

    iGrayMax = 255;

    iBlendFactor = 255;

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::Deactivate

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::Deactivate()

    {

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::SetParametersL

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::SetParametersL( MAknsRlParameterIterator& aParameters )

    {

    // Iterate over available parameters

    while( aParameters.HasNext() )

        {

        const TAknsRlParameterData* param = aParameters.NextL();

        // Fetch blend factor value

        if( param->iName->Compare( KAknsRlEffectGrayscaleBlendFactor ) == 0 )

            {

            if( param->iType != EAknsRlParameterTypeNumber )

                User::Leave( KErrArgument );

            iBlendFactor = param->iNumber;

            }

        // Fetch gray min value

        else if( param->iName->Compare( KAknsRlEffectGrayscaleGrayMin ) == 0 )

            {

            if( param->iType != EAknsRlParameterTypeNumber )

                User::Leave( KErrArgument );

            iGrayMin = param->iNumber;

            }

        // Fetch gray max value

        else if( param->iName->Compare( KAknsRlEffectGrayscaleGrayMax ) == 0 )

            {

            if( param->iType != EAknsRlParameterTypeNumber )

                User::Leave( KErrArgument );

            iGrayMax = param->iNumber;

            }

        }

    // Sanity check, minimum limit cannot be larger than maximum limit

    if( iGrayMin > iGrayMax )

        User::Leave( KErrArgument );

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::GetCapabilities

// -----------------------------------------------------------------------------

//

void CAknsRlEffectPluginGrayscale::GetCapabilities( TAknsRlEffectCaps& aCaps )

    {

    aCaps.iOutputLayerSupport = KAknsRlLayerRGBOnly;

    aCaps.iInputLayerASupport = KAknsRlLayerRGBOnly;

    aCaps.iInputLayerBSupport = KAknsRlLayerNone;

    }

// -----------------------------------------------------------------------------

// CAknsRlEffectPluginGrayscale::Render

// -----------------------------------------------------------------------------

//

TInt CAknsRlEffectPluginGrayscale::Render( const TAknsRlRenderOpParam& aParam )

    {

    if( !iContext ) // We absolutely need the context

        {

        return KErrBadHandle;

        }

    // To do anything we need both, the output layer and input layer

    if( ( aParam.iOutputLayerStatus & KAknsRlLayerRGBOnly ) &&

        ( aParam.iInputLayerAStatus & KAknsRlLayerRGBOnly ) )

        {

        // Query the layers, uninitialized because we process the whole image

        TAknsRlLayerData dataTarget;

        TRAPD( err, iContext->GetLayerDataL( dataTarget, aParam.iOutputLayerIndex,

                                             aParam.iOutputLayerStatus, EFalse ) );

        if( KErrNone != err )

            return KErrArgument;

        TAknsRlLayerData dataSource;

        TRAP( err, iContext->GetLayerDataL( dataSource, aParam.iInputLayerAIndex,

                                            aParam.iInputLayerAStatus, EFalse ) );

        if( KErrNone != err )

            return KErrArgument;

        if( !dataTarget.iRGBBitmap ) // We need the target bitmap

            return KErrBadHandle;

        if( !dataSource.iRGBBitmap ) // We need the source bitmap

            return KErrBadHandle;

        TDisplayMode modeT = dataTarget.iRGBBitmap->DisplayMode();

        TDisplayMode modeS = dataSource.iRGBBitmap->DisplayMode();

        // Rgb -> Rgb modes

        if( EColor64K == modeS && EColor64K == modeT )

            {

            AknsRlEffectGrayscale<TUint16,0,5,6,5>::ProcessRgbToRgb(

                            *dataTarget.iRGBBitmap,

                            *dataSource.iRGBBitmap,

                            iGrayMin,

                            iGrayMax,

                            iBlendFactor );

            }

        else if( EColor16MU == modeS && EColor16MU == modeT )

            {

            AknsRlEffectGrayscale<TUint32,8,8,8,8>::ProcessRgbToRgb(

                            *dataTarget.iRGBBitmap,

                            *dataSource.iRGBBitmap,

                            iGrayMin,

                            iGrayMax,

                            iBlendFactor );

            }

        // Rgb -> Gray modes

        else if( EColor64K == modeS && EGray256 == modeT )

            {

            AknsRlEffectGrayscale<TUint16,0,5,6,5>::ProcessRgbToGray(

                            *dataTarget.iRGBBitmap,

                            *dataSource.iRGBBitmap,

                            iGrayMin,

                            iGrayMax );

            }

        else if( EColor16MU == modeS && EGray256 == modeT )

            {

            AknsRlEffectGrayscale<TUint32,8,8,8,8>::ProcessRgbToGray(

                            *dataTarget.iRGBBitmap,

                            *dataSource.iRGBBitmap,

                            iGrayMin,

                            iGrayMax );

            }

        else

            {

            // Provided layers have illegal display mode combination

            return KErrArgument;

            }

        }

    else

        {

        // Required layers were not provided

        return KErrArgument;

        }

    return KErrNone;

    }

// End of File