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/*
* Copyright (C) 2005, 2006 Alexander Kellett <lypanov@kde.org>
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(SVG)
#import "SVGResourceMasker.h"
#import "BlockExceptions.h"
#import "CgSupport.h"
#import "GraphicsContext.h"
#import "ImageBuffer.h"
#import "SVGMaskElement.h"
#import "SVGRenderSupport.h"
#import "SVGRenderStyle.h"
#import "SVGResourceFilter.h"
#import <QuartzCore/CIFilter.h>
#import <QuartzCore/CoreImage.h>
using namespace std;
namespace WebCore {
static CIImage* applyLuminanceToAlphaFilter(CIImage* inputImage)
{
CIFilter* luminanceToAlpha = [CIFilter filterWithName:@"CIColorMatrix"];
[luminanceToAlpha setDefaults];
CGFloat alpha[4] = {0.2125f, 0.7154f, 0.0721f, 0.0f};
CGFloat zero[4] = {0.0f, 0.0f, 0.0f, 0.0f};
[luminanceToAlpha setValue:inputImage forKey:@"inputImage"];
[luminanceToAlpha setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputRVector"];
[luminanceToAlpha setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputGVector"];
[luminanceToAlpha setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputBVector"];
[luminanceToAlpha setValue:[CIVector vectorWithValues:alpha count:4] forKey:@"inputAVector"];
[luminanceToAlpha setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputBiasVector"];
return [luminanceToAlpha valueForKey:@"outputImage"];
}
static CIImage* applyExpandAlphatoGrayscaleFilter(CIImage* inputImage)
{
CIFilter* alphaToGrayscale = [CIFilter filterWithName:@"CIColorMatrix"];
CGFloat zero[4] = {0, 0, 0, 0};
[alphaToGrayscale setDefaults];
[alphaToGrayscale setValue:inputImage forKey:@"inputImage"];
[alphaToGrayscale setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputRVector"];
[alphaToGrayscale setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputGVector"];
[alphaToGrayscale setValue:[CIVector vectorWithValues:zero count:4] forKey:@"inputBVector"];
[alphaToGrayscale setValue:[CIVector vectorWithX:0.0f Y:0.0f Z:0.0f W:1.0f] forKey:@"inputAVector"];
[alphaToGrayscale setValue:[CIVector vectorWithX:1.0f Y:1.0f Z:1.0f W:0.0f] forKey:@"inputBiasVector"];
return [alphaToGrayscale valueForKey:@"outputImage"];
}
static CIImage* transformImageIntoGrayscaleMask(CIImage* inputImage)
{
CIFilter* blackBackground = [CIFilter filterWithName:@"CIConstantColorGenerator"];
[blackBackground setValue:[CIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:1.0f] forKey:@"inputColor"];
CIFilter* layerOverBlack = [CIFilter filterWithName:@"CISourceOverCompositing"];
[layerOverBlack setValue:[blackBackground valueForKey:@"outputImage"] forKey:@"inputBackgroundImage"];
[layerOverBlack setValue:inputImage forKey:@"inputImage"];
CIImage* luminanceAlpha = applyLuminanceToAlphaFilter([layerOverBlack valueForKey:@"outputImage"]);
CIImage* luminanceAsGrayscale = applyExpandAlphatoGrayscaleFilter(luminanceAlpha);
CIImage* alphaAsGrayscale = applyExpandAlphatoGrayscaleFilter(inputImage);
CIFilter* multipliedGrayscale = [CIFilter filterWithName:@"CIMultiplyCompositing"];
[multipliedGrayscale setValue:luminanceAsGrayscale forKey:@"inputBackgroundImage"];
[multipliedGrayscale setValue:alphaAsGrayscale forKey:@"inputImage"];
return [multipliedGrayscale valueForKey:@"outputImage"];
}
void SVGResourceMasker::applyMask(GraphicsContext* context, const FloatRect& boundingBox)
{
if (!m_mask)
m_mask.set(m_ownerElement->drawMaskerContent(boundingBox, m_maskRect).release());
if (!m_mask)
return;
IntSize maskSize(static_cast<int>(m_maskRect.width()), static_cast<int>(m_maskRect.height()));
clampImageBufferSizeToViewport(m_ownerElement->document()->renderer(), maskSize);
// Create new graphics context in gray scale mode for image rendering
auto_ptr<ImageBuffer> grayScaleImage(ImageBuffer::create(maskSize, true));
if (!grayScaleImage.get())
return;
BEGIN_BLOCK_OBJC_EXCEPTIONS
CGContextRef grayScaleContext = grayScaleImage->context()->platformContext();
CIContext* ciGrayscaleContext = [CIContext contextWithCGContext:grayScaleContext options:nil];
// Transform colorized mask to gray scale
CIImage* colorMask = [CIImage imageWithCGImage:m_mask->cgImage()];
if (!colorMask)
return;
CIImage* grayScaleMask = transformImageIntoGrayscaleMask(colorMask);
[ciGrayscaleContext drawImage:grayScaleMask atPoint:CGPointZero fromRect:CGRectMake(0, 0, maskSize.width(), maskSize.height())];
CGContextClipToMask(context->platformContext(), m_maskRect, grayScaleImage->cgImage());
END_BLOCK_OBJC_EXCEPTIONS
}
} // namespace WebCore
#endif // ENABLE(SVG)
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