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/*
* Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
* 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 "FilterEffect.h"
#include "Filter.h"
#include "ImageBuffer.h"
#include "TextStream.h"
#include <wtf/ByteArray.h>
namespace WebCore {
FilterEffect::FilterEffect(Filter* filter)
: m_alphaImage(false)
, m_filter(filter)
, m_hasX(false)
, m_hasY(false)
, m_hasWidth(false)
, m_hasHeight(false)
{
ASSERT(m_filter);
}
FilterEffect::~FilterEffect()
{
}
void FilterEffect::determineAbsolutePaintRect()
{
m_absolutePaintRect = IntRect();
unsigned size = m_inputEffects.size();
for (unsigned i = 0; i < size; ++i)
m_absolutePaintRect.unite(m_inputEffects.at(i)->absolutePaintRect());
// SVG specification wants us to clip to primitive subregion.
m_absolutePaintRect.intersect(m_maxEffectRect);
}
IntRect FilterEffect::requestedRegionOfInputImageData(const IntRect& effectRect) const
{
ASSERT(hasResult());
IntPoint location = m_absolutePaintRect.location();
location.move(-effectRect.x(), -effectRect.y());
return IntRect(location, m_absolutePaintRect.size());
}
IntRect FilterEffect::drawingRegionOfInputImage(const IntRect& srcRect) const
{
return IntRect(IntPoint(srcRect.x() - m_absolutePaintRect.x(),
srcRect.y() - m_absolutePaintRect.y()), srcRect.size());
}
FilterEffect* FilterEffect::inputEffect(unsigned number) const
{
ASSERT(number < m_inputEffects.size());
return m_inputEffects.at(number).get();
}
void FilterEffect::clearResult()
{
if (m_imageBufferResult)
m_imageBufferResult.clear();
if (m_unmultipliedImageResult)
m_unmultipliedImageResult.clear();
if (m_premultipliedImageResult)
m_premultipliedImageResult.clear();
}
ImageBuffer* FilterEffect::asImageBuffer()
{
if (!hasResult())
return 0;
if (m_imageBufferResult)
return m_imageBufferResult.get();
m_imageBufferResult = ImageBuffer::create(m_absolutePaintRect.size(), ColorSpaceLinearRGB);
IntRect destinationRect(IntPoint(), m_absolutePaintRect.size());
if (m_premultipliedImageResult)
m_imageBufferResult->putPremultipliedImageData(m_premultipliedImageResult.get(), destinationRect.size(), destinationRect, IntPoint());
else
m_imageBufferResult->putUnmultipliedImageData(m_unmultipliedImageResult.get(), destinationRect.size(), destinationRect, IntPoint());
return m_imageBufferResult.get();
}
PassRefPtr<ByteArray> FilterEffect::asUnmultipliedImage(const IntRect& rect)
{
RefPtr<ByteArray> imageData = ByteArray::create(rect.width() * rect.height() * 4);
copyUnmultipliedImage(imageData.get(), rect);
return imageData.release();
}
PassRefPtr<ByteArray> FilterEffect::asPremultipliedImage(const IntRect& rect)
{
RefPtr<ByteArray> imageData = ByteArray::create(rect.width() * rect.height() * 4);
copyPremultipliedImage(imageData.get(), rect);
return imageData.release();
}
inline void FilterEffect::copyImageBytes(ByteArray* source, ByteArray* destination, const IntRect& rect)
{
// Copy the necessary lines.
if (rect.x() < 0 || rect.y() < 0 || rect.maxY() > m_absolutePaintRect.width() || rect.maxY() > m_absolutePaintRect.height())
memset(destination->data(), 0, destination->length());
int xOrigin = rect.x();
int xDest = 0;
if (xOrigin < 0) {
xDest = -xOrigin;
xOrigin = 0;
}
int xEnd = rect.maxX();
if (xEnd > m_absolutePaintRect.width())
xEnd = m_absolutePaintRect.width();
int yOrigin = rect.y();
int yDest = 0;
if (yOrigin < 0) {
yDest = -yOrigin;
yOrigin = 0;
}
int yEnd = rect.maxY();
if (yEnd > m_absolutePaintRect.height())
yEnd = m_absolutePaintRect.height();
int size = (xEnd - xOrigin) * 4;
int destinationScanline = rect.width() * 4;
int sourceScanline = m_absolutePaintRect.width() * 4;
unsigned char *destinationPixel = destination->data() + ((yDest * rect.width()) + xDest) * 4;
unsigned char *sourcePixel = source->data() + ((yOrigin * m_absolutePaintRect.width()) + xOrigin) * 4;
while (yOrigin < yEnd) {
memcpy(destinationPixel, sourcePixel, size);
destinationPixel += destinationScanline;
sourcePixel += sourceScanline;
++yOrigin;
}
}
void FilterEffect::copyUnmultipliedImage(ByteArray* destination, const IntRect& rect)
{
ASSERT(hasResult());
if (!m_unmultipliedImageResult) {
// We prefer a conversion from the image buffer.
if (m_imageBufferResult)
m_unmultipliedImageResult = m_imageBufferResult->getUnmultipliedImageData(IntRect(IntPoint(), m_absolutePaintRect.size()));
else {
m_unmultipliedImageResult = ByteArray::create(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
unsigned char* sourceComponent = m_premultipliedImageResult->data();
unsigned char* destinationComponent = m_unmultipliedImageResult->data();
unsigned char* end = sourceComponent + (m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
while (sourceComponent < end) {
int alpha = sourceComponent[3];
if (alpha) {
destinationComponent[0] = static_cast<int>(sourceComponent[0]) * 255 / alpha;
destinationComponent[1] = static_cast<int>(sourceComponent[1]) * 255 / alpha;
destinationComponent[2] = static_cast<int>(sourceComponent[2]) * 255 / alpha;
} else {
destinationComponent[0] = 0;
destinationComponent[1] = 0;
destinationComponent[2] = 0;
}
destinationComponent[3] = alpha;
sourceComponent += 4;
destinationComponent += 4;
}
}
}
copyImageBytes(m_unmultipliedImageResult.get(), destination, rect);
}
void FilterEffect::copyPremultipliedImage(ByteArray* destination, const IntRect& rect)
{
ASSERT(hasResult());
if (!m_premultipliedImageResult) {
// We prefer a conversion from the image buffer.
if (m_imageBufferResult)
m_premultipliedImageResult = m_imageBufferResult->getPremultipliedImageData(IntRect(IntPoint(), m_absolutePaintRect.size()));
else {
m_premultipliedImageResult = ByteArray::create(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
unsigned char* sourceComponent = m_unmultipliedImageResult->data();
unsigned char* destinationComponent = m_premultipliedImageResult->data();
unsigned char* end = sourceComponent + (m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
while (sourceComponent < end) {
int alpha = sourceComponent[3];
destinationComponent[0] = static_cast<int>(sourceComponent[0]) * alpha / 255;
destinationComponent[1] = static_cast<int>(sourceComponent[1]) * alpha / 255;
destinationComponent[2] = static_cast<int>(sourceComponent[2]) * alpha / 255;
destinationComponent[3] = alpha;
sourceComponent += 4;
destinationComponent += 4;
}
}
}
copyImageBytes(m_premultipliedImageResult.get(), destination, rect);
}
ImageBuffer* FilterEffect::createImageBufferResult()
{
// Only one result type is allowed.
ASSERT(!hasResult());
determineAbsolutePaintRect();
if (m_absolutePaintRect.isEmpty())
return 0;
m_imageBufferResult = ImageBuffer::create(m_absolutePaintRect.size(), ColorSpaceLinearRGB);
if (!m_imageBufferResult)
return 0;
ASSERT(m_imageBufferResult->context());
return m_imageBufferResult.get();
}
ByteArray* FilterEffect::createUnmultipliedImageResult()
{
// Only one result type is allowed.
ASSERT(!hasResult());
determineAbsolutePaintRect();
if (m_absolutePaintRect.isEmpty())
return 0;
m_unmultipliedImageResult = ByteArray::create(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
return m_unmultipliedImageResult.get();
}
ByteArray* FilterEffect::createPremultipliedImageResult()
{
// Only one result type is allowed.
ASSERT(!hasResult());
determineAbsolutePaintRect();
if (m_absolutePaintRect.isEmpty())
return 0;
m_premultipliedImageResult = ByteArray::create(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
return m_premultipliedImageResult.get();
}
TextStream& FilterEffect::externalRepresentation(TextStream& ts, int) const
{
// FIXME: We should dump the subRegions of the filter primitives here later. This isn't
// possible at the moment, because we need more detailed informations from the target object.
return ts;
}
} // namespace WebCore
#endif // ENABLE(FILTERS)
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