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/*
* 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(SVG) && ENABLE(FILTERS)
#include "SVGFilter.h"
#include "SVGFEImage.h"
namespace WebCore {
SVGFilter::SVGFilter(const AffineTransform& absoluteTransform, const FloatRect& absoluteSourceDrawingRegion, const FloatRect& targetBoundingBox, const FloatRect& filterRegion, bool effectBBoxMode)
: Filter()
, m_absoluteTransform(absoluteTransform)
, m_absoluteSourceDrawingRegion(absoluteSourceDrawingRegion)
, m_targetBoundingBox(targetBoundingBox)
, m_filterRegion(filterRegion)
, m_effectBBoxMode(effectBBoxMode)
{
m_absoluteFilterRegion = absoluteTransform.mapRect(filterRegion);
}
void SVGFilter::determineFilterPrimitiveSubregion(FilterEffect* effect, const FloatRect& unionOfPreviousPrimitiveSubregions)
{
FloatRect subRegionBBox = effect->effectBoundaries();
FloatRect newSubRegion = subRegionBBox;
if (m_effectBBoxMode) {
newSubRegion = unionOfPreviousPrimitiveSubregions;
if (effect->hasX())
newSubRegion.setX(m_targetBoundingBox.x() + subRegionBBox.x() * m_targetBoundingBox.width());
if (effect->hasY())
newSubRegion.setY(m_targetBoundingBox.y() + subRegionBBox.y() * m_targetBoundingBox.height());
if (effect->hasWidth())
newSubRegion.setWidth(subRegionBBox.width() * m_targetBoundingBox.width());
if (effect->hasHeight())
newSubRegion.setHeight(subRegionBBox.height() * m_targetBoundingBox.height());
} else {
if (!effect->hasX())
newSubRegion.setX(unionOfPreviousPrimitiveSubregions.x());
if (!effect->hasY())
newSubRegion.setY(unionOfPreviousPrimitiveSubregions.y());
if (!effect->hasWidth())
newSubRegion.setWidth(unionOfPreviousPrimitiveSubregions.width());
if (!effect->hasHeight())
newSubRegion.setHeight(unionOfPreviousPrimitiveSubregions.height());
}
effect->setFilterPrimitiveSubregion(newSubRegion);
// TODO: Everything above should be moved to a first phase of layout in RenderSVGResourceFilterPrimitive.
// The scaling of the subregion to the repaint rect should be merged with a more intelligent repaint logic
// and moved to the second phase of layout in RenderSVGResourceFilterPrimitive.
// See bug https://bugs.webkit.org/show_bug.cgi?id=45614.
newSubRegion = m_absoluteTransform.mapRect(newSubRegion);
newSubRegion.scale(filterResolution().width(), filterResolution().height());
// FEImage needs the unclipped subregion in absolute coordinates to determine the correct
// destination rect in combination with preserveAspectRatio.
if (effect->filterEffectType() == FilterEffectTypeImage) {
FEImage* imageEffect = static_cast<FEImage*>(effect);
imageEffect->setAbsoluteSubregion(newSubRegion);
}
// Clip every filter effect to the filter region.
FloatRect absoluteScaledFilterRegion = m_absoluteFilterRegion;
absoluteScaledFilterRegion.scale(filterResolution().width(), filterResolution().height());
newSubRegion.intersect(absoluteScaledFilterRegion);
effect->setMaxEffectRect(enclosingIntRect(newSubRegion));
if (effect->filterEffectType() != FilterEffectTypeSourceInput)
m_maxImageSize = m_maxImageSize.expandedTo(newSubRegion.size());
}
float SVGFilter::applyHorizontalScale(float value) const
{
if (m_effectBBoxMode)
value *= m_targetBoundingBox.width();
return Filter::applyHorizontalScale(value) * m_absoluteFilterRegion.width() / m_filterRegion.width();
}
float SVGFilter::applyVerticalScale(float value) const
{
if (m_effectBBoxMode)
value *= m_targetBoundingBox.height();
return Filter::applyVerticalScale(value) * m_absoluteFilterRegion.height() / m_filterRegion.height();
}
PassRefPtr<SVGFilter> SVGFilter::create(const AffineTransform& absoluteTransform, const FloatRect& absoluteSourceDrawingRegion, const FloatRect& targetBoundingBox, const FloatRect& filterRegion, bool effectBBoxMode)
{
return adoptRef(new SVGFilter(absoluteTransform, absoluteSourceDrawingRegion, targetBoundingBox, filterRegion, effectBBoxMode));
}
} // namespace WebCore
#endif // ENABLE(SVG) && ENABLE(FILTERS)
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