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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"
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(m_effectBuffer);
IntPoint location = m_absolutePaintRect.location();
location.move(-effectRect.x(), -effectRect.y());
return IntRect(location, m_effectBuffer->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();
}
GraphicsContext* FilterEffect::effectContext()
{
determineAbsolutePaintRect();
if (m_absolutePaintRect.isEmpty())
return 0;
m_effectBuffer = ImageBuffer::create(m_absolutePaintRect.size(), ColorSpaceLinearRGB);
if (!m_effectBuffer)
return 0;
return m_effectBuffer->context();
}
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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