uiacceltk/hitchcock/coretoolkit/rendervg10/src/HuiFxVg10OutlineFilter.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 09 Jun 2010 10:41:25 +0300
branchRCL_3
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parent 0 15bf7259bb7c
permissions -rw-r--r--
Revision: 201022 Kit: 2010123
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:   
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*
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*/
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#include "HuiFxVg10OutlineFilter.h"
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#include "HuiFxVg10RenderbufferBase.h"
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#include "HuiFxConstants.h"
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CHuiFxVg10OutlineFilter* CHuiFxVg10OutlineFilter::NewL()
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    {
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    CHuiFxVg10OutlineFilter* self = new (ELeave) CHuiFxVg10OutlineFilter();
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    CleanupStack::PushL( self );
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    self->ConstructL();
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    CleanupStack::Pop( self );
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    return self;
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    }
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void CHuiFxVg10OutlineFilter::ConstructL()
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    {
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    CHuiFxFilter::ConstructL();
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    iOutlineX = 1.0;
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    iOutlineY = 1.0;
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    iSteepness = 20.0;
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    iColor = TRgb(0xff000000);
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    memset(iLUT, '\0', sizeof(iLUT));
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    RegisterParameterL(KLitOutlineX, &iOutlineX);
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    RegisterParameterL(KLitOutlineY, &iOutlineY);
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    RegisterParameterL(KLitSteepness, &iSteepness);
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    RegisterParameterL(KLitColor, &iColor);
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    }
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CHuiFxVg10OutlineFilter *CHuiFxVg10OutlineFilter::CloneL() const
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    {
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    CHuiFxVg10OutlineFilter *filter = new(ELeave) CHuiFxVg10OutlineFilter;
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    filter->CHuiFxFilter::CopyFromL(this);
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    filter->iOutlineX = iOutlineX;
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    filter->iOutlineY = iOutlineY;
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    filter->iSteepness = iSteepness;
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    filter->iColor = iColor;
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    memcpy(filter->iLUT, iLUT, sizeof(iLUT));
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    filter->CopyParameterL(KLitOutlineX, &filter->iOutlineX, this);
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    filter->CopyParameterL(KLitOutlineY, &filter->iOutlineY, this);
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    filter->CopyParameterL(KLitSteepness, &filter->iSteepness, this);
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    filter->CopyParameterL(KLitColor, &filter->iColor, this);
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    return filter;    
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    }
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void CHuiFxVg10OutlineFilter::CalculateMargin(TMargins &aMargin) const
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{
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    aMargin.iLeft = iOutlineX*2; 
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    aMargin.iRight = iOutlineX*2;
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    aMargin.iTop = iOutlineY*2;
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    aMargin.iBottom = iOutlineY*2;
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}
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void CHuiFxVg10OutlineFilter::DrawEffect(CHuiFxEngine& aEngine, VGImage aTargetImage, VGImage aSourceImage, TInt aWidth, TInt aHeight, TBool /*aHasSurface*/)
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    {
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    VGfloat outline_x = clamp(iOutlineX, EPSILON, 128.0f);
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    VGfloat outline_y = clamp(iOutlineY, EPSILON, 128.0f);
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    VGubyte steepness = clamp((VGubyte)iSteepness, (VGubyte)0, (VGubyte)255);
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//    VGint width = vgGetParameteri(aSourceImage, VG_IMAGE_WIDTH);
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//    VGint height = vgGetParameteri(aSourceImage, VG_IMAGE_HEIGHT);
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    VGint width = aWidth;
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    VGint height = aHeight;
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    if(outline_x > EPSILON && outline_y > EPSILON) 
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        {
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        CHuiFxRenderbuffer* auxBuffer = aEngine.AcquireRenderbuffer(TSize(width, height));
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        if (!auxBuffer)
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            {
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            return;  // not enough memory --- filter not completed successfully
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            }
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        auxBuffer->BindAsTexture(ERenderbufferUsageReadWrite);
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        VGImage auxImage = reinterpret_cast<CHuiFxVg10RenderbufferBase*>(auxBuffer)->Image();
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        vgGaussianBlur(auxImage, aSourceImage, outline_x, outline_y, VG_TILE_PAD);
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        if(ParameterChanged())
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            {
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            UpdateLUT();
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            }
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        vgLookupSingle(aTargetImage, auxImage, iLUT, VG_ALPHA, VG_TRUE, VG_FALSE);
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        auxBuffer->UnbindAsTexture();
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        aEngine.ReleaseRenderbuffer(auxBuffer);
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        }
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    else    // fast path --- just copy
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        {
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        vgCopyImage(aTargetImage, 0, 0, aSourceImage, 0, 0, width, height, VG_FALSE);   
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        }
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    }
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void CHuiFxVg10OutlineFilter::UpdateLUT()
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    {
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    VGubyte red       = iColor.Red();
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    VGubyte green     = iColor.Green();
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    VGubyte blue      = iColor.Blue();
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    VGubyte steepness = (VGubyte)clamp(iSteepness, 0.0f, 255.0f);
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    VGubyte unnormalisedOpacity = (VGubyte)(clamp(iOpacity, 0.0f, 1.0f) * 255.0f);
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    // generate ramp for alpha channel. the bigger the steepness the more solid the outline. 
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    for(int i = 0; i < 256; i++) 
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        {
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        VGubyte alpha = (i*steepness > unnormalisedOpacity) ? unnormalisedOpacity : i*steepness;
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        iLUT[i] = 0x00000000 | (red << 24) |(green << 16) | (blue << 8) | alpha;
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        }
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    }