bool SVGClipPainter::applyClippingToContext(const LayoutObject& target, const FloatRect& targetBoundingBox,
const FloatRect& paintInvalidationRect, GraphicsContext* context, ClipperState& clipperState)
{
ASSERT(context);
ASSERT(clipperState == ClipperNotApplied);
ASSERT_WITH_SECURITY_IMPLICATION(!m_clip.needsLayout());
if (paintInvalidationRect.isEmpty() || m_clip.hasCycle())
return false;
SVGClipExpansionCycleHelper inClipExpansionChange(m_clip);
AffineTransform animatedLocalTransform = toSVGClipPathElement(m_clip.element())->calculateAnimatedLocalTransform();
// When drawing a clip for non-SVG elements, the CTM does not include the zoom factor.
// In this case, we need to apply the zoom scale explicitly - but only for clips with
// userSpaceOnUse units (the zoom is accounted for objectBoundingBox-resolved lengths).
if (!target.isSVG() && m_clip.clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
ASSERT(m_clip.style());
animatedLocalTransform.scale(m_clip.style()->effectiveZoom());
}
// First, try to apply the clip as a clipPath.
if (m_clip.tryPathOnlyClipping(target, context, animatedLocalTransform, targetBoundingBox)) {
clipperState = ClipperAppliedPath;
return true;
}
// Fall back to masking.
clipperState = ClipperAppliedMask;
// Begin compositing the clip mask.
CompositingRecorder::beginCompositing(*context, target, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
{
TransformRecorder recorder(*context, target, animatedLocalTransform);
// clipPath can also be clipped by another clipPath.
SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(&m_clip);
LayoutSVGResourceClipper* clipPathClipper = resources ? resources->clipper() : 0;
ClipperState clipPathClipperState = ClipperNotApplied;
if (clipPathClipper && !SVGClipPainter(*clipPathClipper).applyClippingToContext(m_clip, targetBoundingBox, paintInvalidationRect, context, clipPathClipperState)) {
// End the clip mask's compositor.
CompositingRecorder::endCompositing(*context, target);
return false;
}
drawClipMaskContent(context, target, targetBoundingBox);
if (clipPathClipper)
SVGClipPainter(*clipPathClipper).postApplyStatefulResource(m_clip, context, clipPathClipperState);
}
// Masked content layer start.
CompositingRecorder::beginCompositing(*context, target, SkXfermode::kSrcIn_Mode, 1, &paintInvalidationRect);
return true;
}
SVGPaintContext::~SVGPaintContext()
{
if (m_filter) {
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object));
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object)->filter() == m_filter);
ASSERT(m_filterRecordingContext);
SVGFilterPainter(*m_filter).finishEffect(*m_object, *m_filterRecordingContext);
// Reset the paint info after the filter effect has been completed.
// This isn't strictly required (e.g., m_paintInfo.rect is not used
// after this).
m_paintInfo.context = m_originalPaintInfo->context;
m_paintInfo.m_cullRect.m_rect = m_originalPaintInfo->m_cullRect.m_rect;
}
if (m_masker) {
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object));
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object)->masker() == m_masker);
SVGMaskPainter(*m_masker).finishEffect(*m_object, m_paintInfo.context);
}
if (m_clipper) {
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object));
ASSERT(SVGResourcesCache::cachedResourcesForLayoutObject(m_object)->clipper() == m_clipper);
SVGClipPainter(*m_clipper).finishEffect(*m_object, m_paintInfo.context, m_clipperState);
}
}
bool SVGClipPainter::drawClipAsMask(GraphicsContext& context, const LayoutObject& layoutObject, const FloatRect& targetBoundingBox, const FloatRect& targetPaintInvalidationRect, const AffineTransform& localTransform)
{
if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, layoutObject, DisplayItem::SVGClip))
return true;
SkPictureBuilder maskPictureBuilder(targetPaintInvalidationRect, nullptr, &context);
GraphicsContext& maskContext = maskPictureBuilder.context();
{
TransformRecorder recorder(maskContext, layoutObject, localTransform);
// Create a clipPathClipper if this clipPath is clipped by another clipPath.
SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(&m_clip);
LayoutSVGResourceClipper* clipPathClipper = resources ? resources->clipper() : nullptr;
ClipperState clipPathClipperState = ClipperNotApplied;
if (clipPathClipper && !SVGClipPainter(*clipPathClipper).prepareEffect(m_clip, targetBoundingBox, targetPaintInvalidationRect, maskContext, clipPathClipperState))
return false;
{
AffineTransform contentTransform;
if (m_clip.clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
contentTransform.translate(targetBoundingBox.x(), targetBoundingBox.y());
contentTransform.scaleNonUniform(targetBoundingBox.width(), targetBoundingBox.height());
}
SubtreeContentTransformScope contentTransformScope(contentTransform);
TransformRecorder contentTransformRecorder(maskContext, layoutObject, contentTransform);
RefPtr<const SkPicture> clipContentPicture = m_clip.createContentPicture();
maskContext.getPaintController().createAndAppend<DrawingDisplayItem>(layoutObject, DisplayItem::SVGClip, clipContentPicture.get());
}
if (clipPathClipper)
SVGClipPainter(*clipPathClipper).finishEffect(m_clip, maskContext, clipPathClipperState);
}
LayoutObjectDrawingRecorder drawingRecorder(context, layoutObject, DisplayItem::SVGClip, targetPaintInvalidationRect);
RefPtr<SkPicture> maskPicture = maskPictureBuilder.endRecording();
context.drawPicture(maskPicture.get());
return true;
}
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;
}
~ClipPathHelper()
{
if (m_resourceClipper)
SVGClipPainter(*m_resourceClipper).finishEffect(*m_paintLayer.layoutObject(), m_context, m_clipperState);
}
~ClipPathHelper()
{
if (m_resourceClipper)
SVGClipPainter(*m_resourceClipper).postApplyStatefulResource(*m_paintLayer.layoutObject(), m_context, m_clipperState);
}
