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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(SVG) && ENABLE(FILTERS)
#include "SVGResourceFilter.h"
#include "FilterEffect.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "PlatformString.h"
#include "SVGFilter.h"
#include "SVGFilterBuilder.h"
#include "SVGRenderTreeAsText.h"
#include "SVGFilterPrimitiveStandardAttributes.h"
namespace WebCore {
SVGResourceFilter::SVGResourceFilter()
: m_filterBBoxMode(false)
, m_effectBBoxMode(false)
, m_xBBoxMode(false)
, m_yBBoxMode(false)
, m_savedContext(0)
, m_sourceGraphicBuffer(0)
{
m_filterBuilder.set(new SVGFilterBuilder());
}
void SVGResourceFilter::addFilterEffect(SVGFilterPrimitiveStandardAttributes* effectAttributes, PassRefPtr<FilterEffect> effect)
{
effectAttributes->setStandardAttributes(this, effect.get());
builder()->add(effectAttributes->result(), effect);
}
FloatRect SVGResourceFilter::filterBBoxForItemBBox(const FloatRect& itemBBox) const
{
FloatRect filterBBox = filterRect();
if (filterBoundingBoxMode())
filterBBox = FloatRect(itemBBox.x() + filterBBox.x() * itemBBox.width(),
itemBBox.y() + filterBBox.y() * itemBBox.height(),
filterBBox.width() * itemBBox.width(),
filterBBox.height() * itemBBox.height());
return filterBBox;
}
void SVGResourceFilter::prepareFilter(GraphicsContext*& context, const RenderObject* object)
{
m_itemBBox = object->objectBoundingBox();
m_filterBBox = filterBBoxForItemBBox(m_itemBBox);
// clip sourceImage to filterRegion
FloatRect clippedSourceRect = m_itemBBox;
clippedSourceRect.intersect(m_filterBBox);
// prepare Filters
m_filter = SVGFilter::create(m_itemBBox, m_filterBBox, m_effectBBoxMode, m_filterBBoxMode);
FilterEffect* lastEffect = m_filterBuilder->lastEffect();
if (lastEffect)
lastEffect->calculateEffectRect(m_filter.get());
// Draw the content of the current element and it's childs to a imageBuffer to get the SourceGraphic.
// The size of the SourceGraphic is clipped to the size of the filterRegion.
IntRect bufferRect = enclosingIntRect(clippedSourceRect);
OwnPtr<ImageBuffer> sourceGraphic(ImageBuffer::create(bufferRect.size(), LinearRGB));
if (!sourceGraphic.get())
return;
GraphicsContext* sourceGraphicContext = sourceGraphic->context();
sourceGraphicContext->translate(-m_itemBBox.x(), -m_itemBBox.y());
sourceGraphicContext->clearRect(FloatRect(FloatPoint(), m_itemBBox.size()));
m_sourceGraphicBuffer.set(sourceGraphic.release());
m_savedContext = context;
context = sourceGraphicContext;
}
void SVGResourceFilter::applyFilter(GraphicsContext*& context, const RenderObject*)
{
if (!m_savedContext)
return;
context = m_savedContext;
m_savedContext = 0;
#if !PLATFORM(CG)
m_sourceGraphicBuffer->transformColorSpace(DeviceRGB, LinearRGB);
#endif
FilterEffect* lastEffect = m_filterBuilder->lastEffect();
if (lastEffect && !m_filterBBox.isEmpty() && !lastEffect->subRegion().isEmpty()) {
m_filter->setSourceImage(m_sourceGraphicBuffer.release());
lastEffect->apply(m_filter.get());
ImageBuffer* resultImage = lastEffect->resultImage();
if (resultImage) {
#if !PLATFORM(CG)
resultImage->transformColorSpace(LinearRGB, DeviceRGB);
#endif
context->drawImage(resultImage->image(), lastEffect->subRegion());
}
}
m_sourceGraphicBuffer.clear();
}
TextStream& SVGResourceFilter::externalRepresentation(TextStream& ts) const
{
ts << "[type=FILTER] ";
FloatRect bbox = filterRect();
static FloatRect defaultFilterRect(0, 0, 1, 1);
if (!filterBoundingBoxMode() || bbox != defaultFilterRect) {
ts << " [bounding box=";
if (filterBoundingBoxMode()) {
bbox.scale(100.f);
ts << "at (" << bbox.x() << "%," << bbox.y() << "%) size " << bbox.width() << "%x" << bbox.height() << "%";
} else
ts << filterRect();
ts << "]";
}
if (!filterBoundingBoxMode()) // default is true
ts << " [bounding box mode=" << filterBoundingBoxMode() << "]";
if (effectBoundingBoxMode()) // default is false
ts << " [effect bounding box mode=" << effectBoundingBoxMode() << "]";
return ts;
}
SVGResourceFilter* getFilterById(Document* document, const AtomicString& id)
{
SVGResource* resource = getResourceById(document, id);
if (resource && resource->isFilter())
return static_cast<SVGResourceFilter*>(resource);
return 0;
}
} // namespace WebCore
#endif // ENABLE(SVG)
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