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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 "SVGFilterElement.h"
#include "SVGRenderSupport.h"
#include "SVGRenderTreeAsText.h"
#include "SVGFilterPrimitiveStandardAttributes.h"
static const float kMaxFilterSize = 5000.0f;
using std::min;
namespace WebCore {
SVGResourceFilter::SVGResourceFilter(const SVGFilterElement* ownerElement)
: SVGResource()
, m_ownerElement(ownerElement)
, m_filterBBoxMode(false)
, m_effectBBoxMode(false)
, m_filterRes(false)
, m_scaleX(1.f)
, m_scaleY(1.f)
, m_savedContext(0)
, m_sourceGraphicBuffer(0)
{
m_filterBuilder.set(new SVGFilterBuilder());
}
SVGResourceFilter::~SVGResourceFilter()
{
}
FloatRect SVGResourceFilter::filterBoundingBox(const FloatRect& obb) const
{
return m_ownerElement->filterBoundingBox(obb);
}
static inline bool shouldProcessFilter(SVGResourceFilter* filter, const FloatRect& filterRect)
{
return (!filter->scaleX() || !filter->scaleY() || !filterRect.width() || !filterRect.height());
}
void SVGResourceFilter::addFilterEffect(SVGFilterPrimitiveStandardAttributes* effectAttributes, PassRefPtr<FilterEffect> effect)
{
effectAttributes->setStandardAttributes(this, effect.get());
builder()->add(effectAttributes->result(), effect);
}
bool SVGResourceFilter::fitsInMaximumImageSize(const FloatSize& size)
{
bool matchesFilterSize = true;
if (size.width() > kMaxFilterSize) {
m_scaleX *= kMaxFilterSize / size.width();
matchesFilterSize = false;
}
if (size.height() > kMaxFilterSize) {
m_scaleY *= kMaxFilterSize / size.height();
matchesFilterSize = false;
}
return matchesFilterSize;
}
bool SVGResourceFilter::prepareFilter(GraphicsContext*& context, const RenderObject* object)
{
m_ownerElement->buildFilter(object->objectBoundingBox());
const SVGRenderBase* renderer = object->toSVGRenderBase();
if (!renderer)
return false;
FloatRect paintRect = renderer->strokeBoundingBox();
paintRect.unite(renderer->markerBoundingBox());
if (shouldProcessFilter(this, m_filterBBox))
return false;
// clip sourceImage to filterRegion
FloatRect clippedSourceRect = paintRect;
clippedSourceRect.intersect(m_filterBBox);
// scale filter size to filterRes
FloatRect tempSourceRect = clippedSourceRect;
if (m_filterRes) {
m_scaleX = m_filterResSize.width() / m_filterBBox.width();
m_scaleY = m_filterResSize.height() / m_filterBBox.height();
}
// scale to big sourceImage size to kMaxFilterSize
tempSourceRect.scale(m_scaleX, m_scaleY);
fitsInMaximumImageSize(tempSourceRect.size());
// prepare Filters
m_filter = SVGFilter::create(paintRect, m_filterBBox, m_effectBBoxMode);
m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));
FilterEffect* lastEffect = m_filterBuilder->lastEffect();
if (lastEffect) {
lastEffect->calculateEffectRect(m_filter.get());
// at least one FilterEffect has a too big image size,
// recalculate the effect sizes with new scale factors
if (!fitsInMaximumImageSize(m_filter->maxImageSize())) {
m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));
lastEffect->calculateEffectRect(m_filter.get());
}
} else
return false;
clippedSourceRect.scale(m_scaleX, m_scaleY);
// 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 false;
GraphicsContext* sourceGraphicContext = sourceGraphic->context();
sourceGraphicContext->translate(-clippedSourceRect.x(), -clippedSourceRect.y());
sourceGraphicContext->scale(FloatSize(m_scaleX, m_scaleY));
sourceGraphicContext->clearRect(FloatRect(FloatPoint(), paintRect.size()));
m_sourceGraphicBuffer.set(sourceGraphic.release());
m_savedContext = context;
context = sourceGraphicContext;
return true;
}
void SVGResourceFilter::applyFilter(GraphicsContext*& context, const RenderObject* object)
{
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
ColorSpace colorSpace = DeviceColorSpace;
if (object)
colorSpace = object->style()->colorSpace();
context->drawImage(resultImage->image(), colorSpace, 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, const RenderObject* object)
{
SVGResource* resource = getResourceById(document, id, object);
if (resource && resource->isFilter())
return static_cast<SVGResourceFilter*>(resource);
return 0;
}
} // namespace WebCore
#endif // ENABLE(SVG)
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