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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>
*
* 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(SVG) && ENABLE(FILTERS)
#include "SVGFEMorphology.h"
#include "CanvasPixelArray.h"
#include "Filter.h"
#include "ImageData.h"
#include "SVGRenderTreeAsText.h"
#include <wtf/Vector.h>
using std::min;
using std::max;
namespace WebCore {
FEMorphology::FEMorphology(FilterEffect* in, MorphologyOperatorType type, float radiusX, float radiusY)
: FilterEffect()
, m_in(in)
, m_type(type)
, m_radiusX(radiusX)
, m_radiusY(radiusY)
{
}
PassRefPtr<FEMorphology> FEMorphology::create(FilterEffect* in, MorphologyOperatorType type, float radiusX, float radiusY)
{
return adoptRef(new FEMorphology(in, type, radiusX, radiusY));
}
MorphologyOperatorType FEMorphology::morphologyOperator() const
{
return m_type;
}
void FEMorphology::setMorphologyOperator(MorphologyOperatorType type)
{
m_type = type;
}
float FEMorphology::radiusX() const
{
return m_radiusX;
}
void FEMorphology::setRadiusX(float radiusX)
{
m_radiusX = radiusX;
}
float FEMorphology::radiusY() const
{
return m_radiusY;
}
void FEMorphology::setRadiusY(float radiusY)
{
m_radiusY = radiusY;
}
void FEMorphology::apply(Filter* filter)
{
m_in->apply(filter);
if (!m_in->resultImage())
return;
if (!getEffectContext())
return;
setIsAlphaImage(m_in->isAlphaImage());
int radiusX = static_cast<int>(m_radiusX * filter->filterResolution().width());
int radiusY = static_cast<int>(m_radiusY * filter->filterResolution().height());
if (radiusX <= 0 || radiusY <= 0)
return;
IntRect imageRect(IntPoint(), resultImage()->size());
IntRect effectDrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArray(m_in->resultImage()->getPremultipliedImageData(effectDrawingRect)->data());
RefPtr<ImageData> imageData = ImageData::create(imageRect.width(), imageRect.height());
int effectWidth = effectDrawingRect.width() * 4;
// Limit the radius size to effect dimensions
radiusX = min(effectDrawingRect.width() - 1, radiusX);
radiusY = min(effectDrawingRect.height() - 1, radiusY);
Vector<unsigned char> extrema;
for (int y = 0; y < effectDrawingRect.height(); ++y) {
int startY = max(0, y - radiusY);
int endY = min(effectDrawingRect.height() - 1, y + radiusY);
for (unsigned channel = 0; channel < 4; ++channel) {
// Fill the kernel
extrema.clear();
for (int j = 0; j <= radiusX; ++j) {
unsigned char columnExtrema = srcPixelArray->get(startY * effectWidth + 4 * j + channel);
for (int i = startY; i <= endY; ++i) {
unsigned char pixel = srcPixelArray->get(i * effectWidth + 4 * j + channel);
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && pixel <= columnExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && pixel >= columnExtrema))
columnExtrema = pixel;
}
extrema.append(columnExtrema);
}
// Kernel is filled, get extrema of next column
for (int x = 0; x < effectDrawingRect.width(); ++x) {
unsigned endX = min(x + radiusX, effectDrawingRect.width() - 1);
unsigned char columnExtrema = srcPixelArray->get(startY * effectWidth + endX * 4 + channel);
for (int i = startY; i <= endY; ++i) {
unsigned char pixel = srcPixelArray->get(i * effectWidth + endX * 4 + channel);
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && pixel <= columnExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && pixel >= columnExtrema))
columnExtrema = pixel;
}
if (x - radiusX >= 0)
extrema.remove(0);
if (x + radiusX <= effectDrawingRect.width())
extrema.append(columnExtrema);
unsigned char entireExtrema = extrema[0];
for (unsigned kernelIndex = 0; kernelIndex < extrema.size(); ++kernelIndex) {
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && extrema[kernelIndex] <= entireExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && extrema[kernelIndex] >= entireExtrema))
entireExtrema = extrema[kernelIndex];
}
imageData->data()->set(y * effectWidth + 4 * x + channel, entireExtrema);
}
}
}
resultImage()->putPremultipliedImageData(imageData.get(), imageRect, IntPoint());
}
void FEMorphology::dump()
{
}
static TextStream& operator<<(TextStream& ts, const MorphologyOperatorType& type)
{
switch (type) {
case FEMORPHOLOGY_OPERATOR_UNKNOWN:
ts << "UNKNOWN";
break;
case FEMORPHOLOGY_OPERATOR_ERODE:
ts << "ERODE";
break;
case FEMORPHOLOGY_OPERATOR_DILATE:
ts << "DILATE";
break;
}
return ts;
}
TextStream& FEMorphology::externalRepresentation(TextStream& ts, int indent) const
{
writeIndent(ts, indent);
ts << "[feMorphology";
FilterEffect::externalRepresentation(ts);
ts << " operator=\"" << morphologyOperator() << "\" "
<< "radius=\"" << radiusX() << ", " << radiusY() << "\"]\n";
m_in->externalRepresentation(ts, indent + 1);
return ts;
}
} // namespace WebCore
#endif // ENABLE(SVG) && ENABLE(FILTERS)
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