ClipPathHelper(GraphicsContext* context, const PaintLayer& paintLayer, PaintLayerPaintingInfo& paintingInfo, LayoutRect& rootRelativeBounds, bool& rootRelativeBoundsComputed,
const LayoutPoint& offsetFromRoot, PaintLayerFlags paintFlags)
: m_resourceClipper(0), m_paintLayer(paintLayer), m_context(context)
{
const ComputedStyle& style = paintLayer.layoutObject()->styleRef();
// Clip-path, like border radius, must not be applied to the contents of a composited-scrolling container.
// It must, however, still be applied to the mask layer, so that the compositor can properly mask the
// scrolling contents and scrollbars.
if (!paintLayer.layoutObject()->hasClipPath() || (paintLayer.needsCompositedScrolling() && !(paintFlags & PaintLayerPaintingChildClippingMaskPhase)))
return;
m_clipperState = SVGClipPainter::ClipperNotApplied;
paintingInfo.ancestorHasClipPathClipping = true;
ASSERT(style.clipPath());
if (style.clipPath()->type() == ClipPathOperation::SHAPE) {
ShapeClipPathOperation* clipPath = toShapeClipPathOperation(style.clipPath());
if (clipPath->isValid()) {
if (!rootRelativeBoundsComputed) {
rootRelativeBounds = paintLayer.physicalBoundingBoxIncludingReflectionAndStackingChildren(offsetFromRoot);
rootRelativeBoundsComputed = true;
}
m_clipPathRecorder.emplace(*context, *paintLayer.layoutObject(), clipPath->path(FloatRect(rootRelativeBounds)));
}
} else if (style.clipPath()->type() == ClipPathOperation::REFERENCE) {
ReferenceClipPathOperation* referenceClipPathOperation = toReferenceClipPathOperation(style.clipPath());
Document& document = paintLayer.layoutObject()->document();
// FIXME: It doesn't work with forward or external SVG references (https://bugs.webkit.org/show_bug.cgi?id=90405)
Element* element = document.getElementById(referenceClipPathOperation->fragment());
if (isSVGClipPathElement(element) && element->layoutObject()) {
if (!rootRelativeBoundsComputed) {
rootRelativeBounds = paintLayer.physicalBoundingBoxIncludingReflectionAndStackingChildren(offsetFromRoot);
rootRelativeBoundsComputed = true;
}
m_resourceClipper = toLayoutSVGResourceClipper(toLayoutSVGResourceContainer(element->layoutObject()));
if (!SVGClipPainter(*m_resourceClipper).prepareEffect(*paintLayer.layoutObject(), FloatRect(rootRelativeBounds),
FloatRect(rootRelativeBounds), context, m_clipperState)) {
// No need to post-apply the clipper if this failed.
m_resourceClipper = 0;
}
}
}
}
bool SVGPaintContext::applyClipIfNecessary(SVGResources* resources)
{
// resources->clipper() corresponds to the non-prefixed 'clip-path' whereas
// m_object->style()->clipPath() corresponds to '-webkit-clip-path'.
// FIXME: We should unify the clip-path and -webkit-clip-path codepaths.
if (LayoutSVGResourceClipper* clipper = resources ? resources->clipper() : nullptr) {
if (!SVGClipPainter(*clipper).prepareEffect(*m_object, m_object->objectBoundingBox(), m_object->paintInvalidationRectInLocalCoordinates(), m_paintInfo.context, m_clipperState))
return false;
m_clipper = clipper;
} else {
ClipPathOperation* clipPathOperation = m_object->style()->clipPath();
if (clipPathOperation && clipPathOperation->type() == ClipPathOperation::SHAPE) {
ShapeClipPathOperation* clipPath = toShapeClipPathOperation(clipPathOperation);
if (!clipPath->isValid())
return false;
m_clipPathRecorder = adoptPtr(new ClipPathRecorder(*m_paintInfo.context, *m_object, clipPath->path(m_object->objectBoundingBox())));
}
}
return true;
}
