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/*
Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
2004, 2005 Rob Buis <buis@kde.org>
2005 Eric Seidel <eric@webkit.org>
2009 Dirk Schulze <krit@webkit.org>
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
aint 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 "FEGaussianBlur.h"
#include "CanvasPixelArray.h"
#include "Filter.h"
#include "GraphicsContext.h"
#include "ImageData.h"
#include <math.h>
#include <wtf/MathExtras.h>
namespace WebCore {
FEGaussianBlur::FEGaussianBlur(FilterEffect* in, const float& x, const float& y)
: FilterEffect()
, m_in(in)
, m_x(x)
, m_y(y)
{
}
PassRefPtr<FEGaussianBlur> FEGaussianBlur::create(FilterEffect* in, const float& x, const float& y)
{
return adoptRef(new FEGaussianBlur(in, x, y));
}
float FEGaussianBlur::stdDeviationX() const
{
return m_x;
}
void FEGaussianBlur::setStdDeviationX(float x)
{
m_x = x;
}
float FEGaussianBlur::stdDeviationY() const
{
return m_y;
}
void FEGaussianBlur::setStdDeviationY(float y)
{
m_y = y;
}
static void boxBlur(CanvasPixelArray*& srcPixelArray, CanvasPixelArray*& dstPixelArray,
unsigned dx, int stride, int strideLine, int effectWidth, int effectHeight, bool alphaImage)
{
int dxLeft = dx / 2;
int dxRight = dx - dxLeft;
for (int y = 0; y < effectHeight; ++y) {
int line = y * strideLine;
for (int channel = 3; channel >= 0; --channel) {
int sum = 0;
// Fill the kernel
int maxKernelSize = std::min(dxRight, effectWidth);
for (int i = 0; i < maxKernelSize; ++i)
sum += srcPixelArray->get(line + i * stride + channel);
// Blurring
for (int x = 0; x < effectWidth; ++x) {
int pixelByteOffset = line + x * stride + channel;
dstPixelArray->set(pixelByteOffset, static_cast<unsigned char>(sum / dx));
if (x >= dxLeft)
sum -= srcPixelArray->get(pixelByteOffset - dxLeft * stride);
if (x + dxRight < effectWidth)
sum += srcPixelArray->get(pixelByteOffset + dxRight * stride);
}
if (alphaImage) // Source image is black, it just has different alpha values
break;
}
}
}
void FEGaussianBlur::apply(Filter* filter)
{
m_in->apply(filter);
if (!m_in->resultImage())
return;
if (!getEffectContext())
return;
setIsAlphaImage(m_in->isAlphaImage());
if (m_x == 0 || m_y == 0)
return;
unsigned sdx = static_cast<unsigned>(floor(m_x * 3 * sqrt(2 * piDouble) / 4.f + 0.5f));
unsigned sdy = static_cast<unsigned>(floor(m_y * 3 * sqrt(2 * piDouble) / 4.f + 0.5f));
IntRect effectDrawingRect = calculateDrawingIntRect(m_in->subRegion());
RefPtr<ImageData> srcImageData(m_in->resultImage()->getPremultipliedImageData(effectDrawingRect));
CanvasPixelArray* srcPixelArray(srcImageData->data());
IntRect imageRect(IntPoint(), resultImage()->size());
RefPtr<ImageData> tmpImageData = ImageData::create(imageRect.width(), imageRect.height());
CanvasPixelArray* tmpPixelArray(tmpImageData->data());
int stride = 4 * imageRect.width();
for (int i = 0; i < 3; ++i) {
boxBlur(srcPixelArray, tmpPixelArray, sdx, 4, stride, imageRect.width(), imageRect.height(), isAlphaImage());
boxBlur(tmpPixelArray, srcPixelArray, sdy, stride, 4, imageRect.height(), imageRect.width(), isAlphaImage());
}
resultImage()->putPremultipliedImageData(srcImageData.get(), imageRect, IntPoint());
}
void FEGaussianBlur::dump()
{
}
} // namespace WebCore
#endif // ENABLE(FILTERS)
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