FloatRect RenderSVGResourceMasker::resourceBoundingBox(RenderObject* object)
{
// Save the reference to the calling object for relayouting it on changing resource properties.
if (!m_masker.contains(object))
m_masker.set(object, new MaskerData);
// Resource was not layouted yet. Give back clipping rect of the mask.
SVGMaskElement* maskElement = static_cast<SVGMaskElement*>(node());
FloatRect objectBoundingBox = object->objectBoundingBox();
FloatRect maskBoundaries = maskElement->maskBoundingBox(objectBoundingBox);
if (selfNeedsLayout())
return maskBoundaries;
if (m_maskBoundaries.isEmpty())
calculateMaskContentRepaintRect();
if (!maskElement)
return FloatRect();
FloatRect maskRect = m_maskBoundaries;
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
maskRect = transform.mapRect(maskRect);
}
maskRect.intersect(maskBoundaries);
return maskRect;
}
FloatRect RenderSVGResourceMasker::resourceBoundingBox(RenderObject* object)
{
SVGMaskElement* maskElement = static_cast<SVGMaskElement*>(node());
ASSERT(maskElement);
FloatRect objectBoundingBox = object->objectBoundingBox();
FloatRect maskBoundaries = maskElement->maskBoundingBox(objectBoundingBox);
// Resource was not layouted yet. Give back clipping rect of the mask.
if (selfNeedsLayout())
return maskBoundaries;
if (m_maskContentBoundaries.isEmpty())
calculateMaskContentRepaintRect();
FloatRect maskRect = m_maskContentBoundaries;
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
maskRect = transform.mapRect(maskRect);
}
maskRect.intersect(maskBoundaries);
return maskRect;
}
FloatRect RenderSVGResourceMasker::resourceBoundingBox(const FloatRect& objectBoundingBox)
{
if (m_maskBoundaries.isEmpty())
calculateMaskContentRepaintRect();
SVGMaskElement* maskElement = static_cast<SVGMaskElement*>(node());
if (!maskElement)
return FloatRect();
FloatRect maskRect = m_maskBoundaries;
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
maskRect = transform.mapRect(maskRect);
}
maskRect.intersect(maskElement->maskBoundingBox(objectBoundingBox));
return maskRect;
}
FloatRect RenderSVGResourceMasker::resourceBoundingBox(const RenderObject& object)
{
FloatRect objectBoundingBox = object.objectBoundingBox();
FloatRect maskBoundaries = SVGLengthContext::resolveRectangle<SVGMaskElement>(&maskElement(), maskElement().maskUnits(), objectBoundingBox);
// Resource was not layouted yet. Give back clipping rect of the mask.
if (selfNeedsLayout())
return maskBoundaries;
if (m_maskContentBoundaries.isEmpty())
calculateMaskContentRepaintRect();
FloatRect maskRect = m_maskContentBoundaries;
if (maskElement().maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
maskRect = transform.mapRect(maskRect);
}
maskRect.intersect(maskBoundaries);
return maskRect;
}
void RenderSVGResourceMasker::createMaskImage(MaskerData* maskerData, const SVGMaskElement* maskElement, RenderObject* object)
{
FloatRect objectBoundingBox = object->objectBoundingBox();
// Mask rect clipped with clippingBoundingBox and filterBoundingBox as long as they are present.
maskerData->maskRect = object->repaintRectInLocalCoordinates();
if (maskerData->maskRect.isEmpty()) {
maskerData->emptyMask = true;
return;
}
if (m_maskBoundaries.isEmpty())
calculateMaskContentRepaintRect();
FloatRect repaintRect = m_maskBoundaries;
AffineTransform contextTransform;
// We need to scale repaintRect for objectBoundingBox to get the drawing area.
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
contextTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
FloatPoint contextAdjustment = repaintRect.location();
repaintRect = contextTransform.mapRect(repaintRect);
repaintRect.move(objectBoundingBox.x(), objectBoundingBox.y());
contextTransform.translate(-contextAdjustment.x(), -contextAdjustment.y());
}
repaintRect.intersect(maskerData->maskRect);
maskerData->maskRect = repaintRect;
IntRect maskImageRect = enclosingIntRect(maskerData->maskRect);
maskImageRect.setLocation(IntPoint());
// Don't create ImageBuffers with image size of 0
if (maskImageRect.isEmpty()) {
maskerData->emptyMask = true;
return;
}
// FIXME: This changes color space to linearRGB, the default color space
// for masking operations in SVG. We need a switch for the other color-space
// attribute values sRGB, inherit and auto.
maskerData->maskImage = ImageBuffer::create(maskImageRect.size(), LinearRGB);
if (!maskerData->maskImage)
return;
GraphicsContext* maskImageContext = maskerData->maskImage->context();
ASSERT(maskImageContext);
maskImageContext->save();
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
maskImageContext->translate(-maskerData->maskRect.x(), -maskerData->maskRect.y());
maskImageContext->concatCTM(contextTransform);
// draw the content into the ImageBuffer
for (Node* node = maskElement->firstChild(); node; node = node->nextSibling()) {
RenderObject* renderer = node->renderer();
if (!node->isSVGElement() || !static_cast<SVGElement*>(node)->isStyled() || !renderer)
continue;
RenderStyle* style = renderer->style();
if (!style || style->display() == NONE || style->visibility() != VISIBLE)
continue;
renderSubtreeToImage(maskerData->maskImage.get(), renderer);
}
maskImageContext->restore();
// create the luminance mask
RefPtr<ImageData> imageData(maskerData->maskImage->getUnmultipliedImageData(maskImageRect));
CanvasPixelArray* srcPixelArray(imageData->data());
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArray->length(); pixelOffset += 4) {
unsigned char a = srcPixelArray->get(pixelOffset + 3);
if (!a)
continue;
unsigned char r = srcPixelArray->get(pixelOffset);
unsigned char g = srcPixelArray->get(pixelOffset + 1);
unsigned char b = srcPixelArray->get(pixelOffset + 2);
double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
srcPixelArray->set(pixelOffset + 3, luma);
}
maskerData->maskImage->putUnmultipliedImageData(imageData.get(), maskImageRect, IntPoint());
}