#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()->image()->size());
filterContext->save();
filterContext->clipToImageBuffer(imageRect, filter->sourceImage());
filterContext->fillRect(imageRect, Color::black, DeviceColorSpace);
filterContext->restore();
}
void SourceAlpha::dump()
{
}
}
#endif // ENABLE(FILTERS)