This source file includes following definitions.
- create
- effectName
- determineAbsolutePaintRect
- applySoftware
- createImageFilter
- externalRepresentation
#include "config.h"
#include "platform/graphics/filters/SourceAlpha.h"
#include "platform/graphics/Color.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/filters/Filter.h"
#include "platform/text/TextStream.h"
#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
#include "third_party/skia/include/effects/SkColorMatrixFilter.h"
#include "wtf/StdLibExtras.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter)
{
return adoptRef(new SourceAlpha(filter));
}
const AtomicString& SourceAlpha::effectName()
{
DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha", AtomicString::ConstructFromLiteral));
return s_effectName;
}
FloatRect SourceAlpha::determineAbsolutePaintRect(const FloatRect& requestedRect)
{
FloatRect srcRect = filter()->sourceImageRect();
srcRect.intersect(requestedRect);
addAbsolutePaintRect(srcRect);
return srcRect;
}
void SourceAlpha::applySoftware()
{
ImageBuffer* resultImage = createImageBufferResult();
Filter* filter = this->filter();
if (!resultImage || !filter->sourceImage())
return;
setIsAlphaImage(true);
FloatRect imageRect(FloatPoint(), absolutePaintRect().size());
GraphicsContext* filterContext = resultImage->context();
filterContext->fillRect(imageRect, Color::black);
IntRect srcRect = filter->sourceImageRect();
filterContext->drawImageBuffer(
filter->sourceImage(),
IntPoint(srcRect.location() - absolutePaintRect().location()),
CompositeDestinationIn);
}
PassRefPtr<SkImageFilter> SourceAlpha::createImageFilter(SkiaImageFilterBuilder* builder)
{
SkScalar matrix[20] = {
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, SK_Scalar1, 0
};
RefPtr<SkColorFilter> colorFilter(adoptRef(new SkColorMatrixFilter(matrix)));
return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get()));
}
TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const
{
writeIndent(ts, indent);
ts << "[SourceAlpha]\n";
return ts;
}
}