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/*
* Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
* Copyright (C) 2005 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(FILTERS)
#include "FEComposite.h"
#include "CanvasPixelArray.h"
#include "Filter.h"
#include "GraphicsContext.h"
#include "ImageData.h"
namespace WebCore {
FEComposite::FEComposite(const CompositeOperationType& type, float k1, float k2, float k3, float k4)
: FilterEffect()
, m_type(type)
, m_k1(k1)
, m_k2(k2)
, m_k3(k3)
, m_k4(k4)
{
}
PassRefPtr<FEComposite> FEComposite::create(const CompositeOperationType& type, float k1, float k2, float k3, float k4)
{
return adoptRef(new FEComposite(type, k1, k2, k3, k4));
}
CompositeOperationType FEComposite::operation() const
{
return m_type;
}
void FEComposite::setOperation(CompositeOperationType type)
{
m_type = type;
}
float FEComposite::k1() const
{
return m_k1;
}
void FEComposite::setK1(float k1)
{
m_k1 = k1;
}
float FEComposite::k2() const
{
return m_k2;
}
void FEComposite::setK2(float k2)
{
m_k2 = k2;
}
float FEComposite::k3() const
{
return m_k3;
}
void FEComposite::setK3(float k3)
{
m_k3 = k3;
}
float FEComposite::k4() const
{
return m_k4;
}
void FEComposite::setK4(float k4)
{
m_k4 = k4;
}
inline void arithmetic(const RefPtr<CanvasPixelArray>& srcPixelArrayA, CanvasPixelArray*& srcPixelArrayB,
float k1, float k2, float k3, float k4)
{
float scaledK1 = k1 / 255.f;
float scaledK4 = k4 * 255.f;
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArrayA->length(); pixelOffset += 4) {
for (unsigned channel = 0; channel < 4; ++channel) {
unsigned char i1 = srcPixelArrayA->get(pixelOffset + channel);
unsigned char i2 = srcPixelArrayB->get(pixelOffset + channel);
double result = scaledK1 * i1 * i2 + k2 * i1 + k3 * i2 + scaledK4;
srcPixelArrayB->set(pixelOffset + channel, result);
}
}
}
void FEComposite::determineAbsolutePaintRect(Filter* filter)
{
switch (m_type) {
case FECOMPOSITE_OPERATOR_IN:
case FECOMPOSITE_OPERATOR_ATOP:
// For In and Atop the first effect just influences the result of
// the second effect. So just use the absolute paint rect of the second effect here.
setAbsolutePaintRect(inputEffect(1)->absolutePaintRect());
return;
case FECOMPOSITE_OPERATOR_ARITHMETIC:
// Arithmetic may influnce the compele filter primitive region. So we can't
// optimize the paint region here.
setAbsolutePaintRect(maxEffectRect());
return;
default:
// Take the union of both input effects.
FilterEffect::determineAbsolutePaintRect(filter);
return;
}
}
void FEComposite::apply(Filter* filter)
{
FilterEffect* in = inputEffect(0);
FilterEffect* in2 = inputEffect(1);
in->apply(filter);
in2->apply(filter);
if (!in->resultImage() || !in2->resultImage())
return;
GraphicsContext* filterContext = effectContext(filter);
if (!filterContext)
return;
FloatRect srcRect = FloatRect(0, 0, -1, -1);
switch (m_type) {
case FECOMPOSITE_OPERATOR_OVER:
filterContext->drawImageBuffer(in2->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in2->absolutePaintRect()));
filterContext->drawImageBuffer(in->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()));
break;
case FECOMPOSITE_OPERATOR_IN:
filterContext->save();
filterContext->clipToImageBuffer(in2->resultImage(), drawingRegionOfInputImage(in2->absolutePaintRect()));
filterContext->drawImageBuffer(in->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()));
filterContext->restore();
break;
case FECOMPOSITE_OPERATOR_OUT:
filterContext->drawImageBuffer(in->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()));
filterContext->drawImageBuffer(in2->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in2->absolutePaintRect()), srcRect, CompositeDestinationOut);
break;
case FECOMPOSITE_OPERATOR_ATOP:
filterContext->drawImageBuffer(in2->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in2->absolutePaintRect()));
filterContext->drawImageBuffer(in->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()), srcRect, CompositeSourceAtop);
break;
case FECOMPOSITE_OPERATOR_XOR:
filterContext->drawImageBuffer(in2->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in2->absolutePaintRect()));
filterContext->drawImageBuffer(in->resultImage(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()), srcRect, CompositeXOR);
break;
case FECOMPOSITE_OPERATOR_ARITHMETIC: {
IntRect effectADrawingRect = requestedRegionOfInputImageData(in->absolutePaintRect());
RefPtr<CanvasPixelArray> srcPixelArrayA(in->resultImage()->getPremultipliedImageData(effectADrawingRect)->data());
IntRect effectBDrawingRect = requestedRegionOfInputImageData(in2->absolutePaintRect());
RefPtr<ImageData> imageData(in2->resultImage()->getPremultipliedImageData(effectBDrawingRect));
CanvasPixelArray* srcPixelArrayB(imageData->data());
arithmetic(srcPixelArrayA, srcPixelArrayB, m_k1, m_k2, m_k3, m_k4);
resultImage()->putPremultipliedImageData(imageData.get(), IntRect(IntPoint(), resultImage()->size()), IntPoint());
}
break;
default:
break;
}
}
void FEComposite::dump()
{
}
static TextStream& operator<<(TextStream& ts, const CompositeOperationType& type)
{
switch (type) {
case FECOMPOSITE_OPERATOR_UNKNOWN:
ts << "UNKNOWN";
break;
case FECOMPOSITE_OPERATOR_OVER:
ts << "OVER";
break;
case FECOMPOSITE_OPERATOR_IN:
ts << "IN";
break;
case FECOMPOSITE_OPERATOR_OUT:
ts << "OUT";
break;
case FECOMPOSITE_OPERATOR_ATOP:
ts << "ATOP";
break;
case FECOMPOSITE_OPERATOR_XOR:
ts << "XOR";
break;
case FECOMPOSITE_OPERATOR_ARITHMETIC:
ts << "ARITHMETIC";
break;
}
return ts;
}
TextStream& FEComposite::externalRepresentation(TextStream& ts, int indent) const
{
writeIndent(ts, indent);
ts << "[feComposite";
FilterEffect::externalRepresentation(ts);
ts << " operation=\"" << m_type << "\"";
if (m_type == FECOMPOSITE_OPERATOR_ARITHMETIC)
ts << " k1=\"" << m_k1 << "\" k2=\"" << m_k2 << "\" k3=\"" << m_k3 << "\" k4=\"" << m_k4 << "\"";
ts << "]\n";
inputEffect(0)->externalRepresentation(ts, indent + 1);
inputEffect(1)->externalRepresentation(ts, indent + 1);
return ts;
}
} // namespace WebCore
#endif // ENABLE(FILTERS)
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