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/*
* Copyright (C) 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(FILTERS)
#include "SourceAlpha.h"
#include "Color.h"
#include "GraphicsContext.h"
#include "PlatformString.h"
#include "Filter.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
PassRefPtr<SourceAlpha> SourceAlpha::create()
{
return adoptRef(new SourceAlpha);
}
const AtomicString& SourceAlpha::effectName()
{
DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha"));
return s_effectName;
}
FloatRect SourceAlpha::calculateEffectRect(Filter* filter)
{
FloatRect clippedSourceRect = filter->sourceImageRect();
if (filter->sourceImageRect().x() < filter->filterRegion().x())
clippedSourceRect.setX(filter->filterRegion().x());
if (filter->sourceImageRect().y() < filter->filterRegion().y())
clippedSourceRect.setY(filter->filterRegion().y());
setSubRegion(clippedSourceRect);
clippedSourceRect.scale(filter->filterResolution().width(), filter->filterResolution().height());
setScaledSubRegion(clippedSourceRect);
return filter->filterRegion();
}
void SourceAlpha::apply(Filter* filter)
{
GraphicsContext* filterContext = getEffectContext();
if (!filterContext)
return;
setIsAlphaImage(true);
FloatRect imageRect(FloatPoint(), filter->sourceImage()->size());
filterContext->save();
filterContext->clipToImageBuffer(filter->sourceImage(), imageRect);
filterContext->fillRect(imageRect, Color::black, DeviceColorSpace);
filterContext->restore();
}
void SourceAlpha::dump()
{
}
TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const
{
writeIndent(ts, indent);
ts << "[SourceAlpha]\n";
return ts;
}
} // namespace WebCore
#endif // ENABLE(FILTERS)
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