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; }