SVGResourceMasker.cpp [plain text]
#include "config.h"
#if ENABLE(SVG)
#include "SVGResourceMasker.h"
#include "CanvasPixelArray.h"
#include "Image.h"
#include "ImageBuffer.h"
#include "ImageData.h"
#include "GraphicsContext.h"
#include "SVGMaskElement.h"
#include "SVGRenderSupport.h"
#include "SVGRenderStyle.h"
#include "TextStream.h"
#include <wtf/ByteArray.h>
using namespace std;
namespace WebCore {
SVGResourceMasker::SVGResourceMasker(const SVGMaskElement* ownerElement)
: SVGResource()
, m_ownerElement(ownerElement)
{
}
SVGResourceMasker::~SVGResourceMasker()
{
}
void SVGResourceMasker::invalidate()
{
SVGResource::invalidate();
m_mask.clear();
}
void SVGResourceMasker::applyMask(GraphicsContext* context, const FloatRect& boundingBox)
{
if (!m_mask)
m_mask = m_ownerElement->drawMaskerContent(boundingBox, m_maskRect);
if (!m_mask)
return;
IntSize imageSize(m_mask->size());
IntRect intImageRect(0, 0, imageSize.width(), imageSize.height());
OwnPtr<ImageBuffer> luminancedImage = ImageBuffer::create(imageSize, false);
if (!luminancedImage)
return;
PassRefPtr<CanvasPixelArray> srcPixelArray(m_mask->getImageData(intImageRect)->data());
PassRefPtr<ImageData> destImageData(luminancedImage->getImageData(intImageRect));
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArray->length(); pixelOffset++) {
unsigned pixelByteOffset = pixelOffset * 4;
unsigned char r = 0, g = 0, b = 0, a = 0;
srcPixelArray->get(pixelByteOffset, r);
srcPixelArray->get(pixelByteOffset + 1, g);
srcPixelArray->get(pixelByteOffset + 2, b);
srcPixelArray->get(pixelByteOffset + 3, a);
double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
destImageData->data()->set(pixelByteOffset + 3, luma);
}
luminancedImage->putImageData(destImageData.get(), intImageRect, IntPoint(0, 0));
context->clipToImageBuffer(m_maskRect, luminancedImage.get());
}
TextStream& SVGResourceMasker::externalRepresentation(TextStream& ts) const
{
ts << "[type=MASKER]";
return ts;
}
SVGResourceMasker* getMaskerById(Document* document, const AtomicString& id)
{
SVGResource* resource = getResourceById(document, id);
if (resource && resource->isMasker())
return static_cast<SVGResourceMasker*>(resource);
return 0;
}
}
#endif