1 /*

     2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   

    15 *

    16 */

    17 

    18 

    19 

    20 #include "HuiFxVg10BlurFilter.h"

    21 #include "HuiFxVg10RenderbufferBase.h"

    22 #include "HuiFxConstants.h"

    23 

    24 // identity mapping of colour components (i.e. 0->0, 1->1, ..., 255->255)

    25 const VGubyte CHuiFxVg10BlurFilter::iColorLUT[256] = 

    26     {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,

    27      0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,

    28      0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,

    29      0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,

    30      0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,

    31      0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,

    32      0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,

    33      0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,

    34      0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,

    35      0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,

    36      0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,

    37      0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,

    38      0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,

    39      0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,

    40      0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,

    41      0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF}; 

    42 

    43 CHuiFxVg10BlurFilter* CHuiFxVg10BlurFilter::NewL()

    44     {

    45     CHuiFxVg10BlurFilter* self = new (ELeave) CHuiFxVg10BlurFilter();

    46     CleanupStack::PushL( self );

    47     self->ConstructL();

    48     CleanupStack::Pop( self );

    49     return self;

    50     }

    51 

    52 void CHuiFxVg10BlurFilter::ConstructL()

    53     {

    54     CHuiFxFilter::ConstructL();

    55     iOldOpacity = -1.0f;        // value out of range to force update of AlphaLUT

    56     iBlurX = 0.0;

    57     iBlurY = 0.0;

    58 

    59     memset(iAlphaLUT, '\0', sizeof(iAlphaLUT));

    60     

    61     RegisterParameterL(KLitBlurX, &iBlurX);

    62     RegisterParameterL(KLitBlurY, &iBlurY);

    63     }

    64 CHuiFxVg10BlurFilter *CHuiFxVg10BlurFilter::CloneL() const

    65     {

    66     CHuiFxVg10BlurFilter *filter = new (ELeave) CHuiFxVg10BlurFilter;

    67     filter->CHuiFxFilter::CopyFromL(this);

    68     filter->iOldOpacity = iOldOpacity;

    69     filter->iBlurX = iBlurX;

    70     filter->iBlurY = iBlurY;

    71     memcpy(filter->iAlphaLUT, iAlphaLUT, sizeof(iAlphaLUT));

    72     filter->CopyParameterL(KLitBlurX, &filter->iBlurX, this);

    73     filter->CopyParameterL(KLitBlurY, &filter->iBlurY, this);

    74     return filter;

    75     }

    76 

    77 

    78 void CHuiFxVg10BlurFilter::CalculateMargin(TMargins &aMargin) const

    79 {

    80     aMargin.iLeft = iBlurX;

    81     aMargin.iRight = iBlurX;

    82     aMargin.iBottom = iBlurY;

    83     aMargin.iTop = iBlurY;

    84 }

    85 

    86 TBool CHuiFxVg10BlurFilter::Draw(CHuiFxEngine& aEngine, CHuiGc& /* aGc */, CHuiFxRenderbuffer& aTarget,

    87                                  CHuiFxRenderbuffer& aSource, const TRect& aTargetRect, const TRect& aSourceRect)

    88     {

    89     aTarget.BindAsTexture(ERenderbufferUsageWriteOnly);

    90     aSource.BindAsTexture(ERenderbufferUsageReadOnly);

    91     VGImage srcImage  = (reinterpret_cast<CHuiFxVg10RenderbufferBase*>(&aSource))->AcquireSubImage(aSourceRect);

    92     VGImage destImage = (reinterpret_cast<CHuiFxVg10RenderbufferBase*>(&aTarget))->AcquireSubImage(aTargetRect);

    93     

    94     // take opacity into account

    95     const VGfloat opacity = clamp(iOpacity, 0.0f, 1.0f);

    96 

    97     if(opacity > EPSILON)

    98         {

    99         DrawEffect(aEngine, destImage, srcImage, aSourceRect.Width(), aSourceRect.Height());

   100         }

   101     else

   102         {

   103 //        VGint width = vgGetParameteri(srcImage, VG_IMAGE_WIDTH);

   104 //        VGint height = vgGetParameteri(srcImage, VG_IMAGE_HEIGHT);

   105         VGint width = aSourceRect.Width();

   106         VGint height = aSourceRect.Height();

   107         vgClearImage(destImage, 0, 0, width, height);

   108         }

   109 

   110     HUIFX_VG_INVARIANT();    

   111     (reinterpret_cast<CHuiFxVg10RenderbufferBase*>(&aSource))->ReleaseSubImage(srcImage);

   112     (reinterpret_cast<CHuiFxVg10RenderbufferBase*>(&aTarget))->ReleaseSubImage(destImage);

   113     aTarget.UnbindAsTexture();

   114     aSource.UnbindAsTexture();

   115     

   116     return wasEnoughMemory();

   117     }

   118 

   119 void CHuiFxVg10BlurFilter::DrawEffect(CHuiFxEngine& aEngine, VGImage aTargetImage, VGImage aSourceImage, TInt aWidth, TInt aHeight)

   120     {

   121     const VGfloat blur_x = clamp(iBlurX, EPSILON, 128.0f);

   122     const VGfloat blur_y = clamp(iBlurY, EPSILON, 128.0f);

   123     const VGfloat opacity = clamp(iOpacity, 0.0f, 1.0f);

   124     

   125     if(opacity < 1.0f - EPSILON)    // slow path --- take opacity into account

   126         {

   127 //        const VGint width = vgGetParameteri(aSourceImage, VG_IMAGE_WIDTH);

   128 //        const VGint height = vgGetParameteri(aSourceImage, VG_IMAGE_HEIGHT);

   129         const VGint width = aWidth;

   130         const VGint height = aHeight;

   131     

   132         CHuiFxRenderbuffer* auxBuffer = aEngine.AcquireRenderbuffer(TSize(width, height));

   133         if (!auxBuffer)

   134             {

   135             return;  // not enough memory --- filter not completed successfully

   136             }

   137         auxBuffer->BindAsTexture(ERenderbufferUsageReadWrite);

   138         

   139         VGImage auxImage = reinterpret_cast<CHuiFxVg10RenderbufferBase*>(auxBuffer)->Image();

   140         

   141         vgGaussianBlur(auxImage, aSourceImage, blur_x, blur_y, VG_TILE_PAD);

   142     

   143         if(OpacityChanged())

   144             {

   145             UpdateAlphaLUT();

   146             }

   147         vgLookup(aTargetImage, auxImage, iColorLUT, iColorLUT, iColorLUT, iAlphaLUT, VG_TRUE, VG_FALSE);

   148         auxBuffer->UnbindAsTexture();

   149         aEngine.ReleaseRenderbuffer(auxBuffer);

   150     }    

   151     else    // fast path --- the blur, just blur and nothing but the blur.

   152         {

   153         vgGaussianBlur(aTargetImage, aSourceImage, blur_x, blur_y, VG_TILE_PAD);   

   154         }

   155     }

   156 

   157 

   158 TBool CHuiFxVg10BlurFilter::OpacityChanged()

   159     {

   160     if(iOpacity != iOldOpacity)

   161         {

   162         iOldOpacity = iOpacity;

   163         return ETrue;

   164         }

   165     else

   166         {

   167         return EFalse;

   168         }

   169     }

   170 

   171 

   172 void CHuiFxVg10BlurFilter::UpdateAlphaLUT()

   173     {

   174     VGfloat opacity = clamp(iOpacity, 0.0f, 1.0f);

   175     

   176     // generate ramp for alpha channel. the bigger the steepness the more solid the outline. 

   177     for(int i = 0; i < 256; i++) 

   178         {

   179         iAlphaLUT[i] = (VGubyte)((VGfloat)i * opacity); 

   180         }

   181     }