bool LayoutSVGResourceClipper::hitTestClipContent(
const FloatRect& objectBoundingBox,
const FloatPoint& nodeAtPoint) {
FloatPoint point = nodeAtPoint;
if (!SVGLayoutSupport::pointInClippingArea(*this, point))
return false;
if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(),
objectBoundingBox.height());
point = transform.inverse().mapPoint(point);
}
AffineTransform animatedLocalTransform =
toSVGClipPathElement(element())->calculateTransform(
SVGElement::IncludeMotionTransform);
if (!animatedLocalTransform.isInvertible())
return false;
point = animatedLocalTransform.inverse().mapPoint(point);
for (const SVGElement& childElement :
Traversal<SVGElement>::childrenOf(*element())) {
if (!contributesToClip(childElement))
continue;
IntPoint hitPoint;
HitTestResult result(HitTestRequest::SVGClipContent, hitPoint);
LayoutObject* layoutObject = childElement.layoutObject();
if (layoutObject->nodeAtFloatPoint(result, point, HitTestForeground))
return true;
}
return false;
}
bool LayoutSVGResourceClipper::hitTestClipContent(const FloatRect& objectBoundingBox, const FloatPoint& nodeAtPoint)
{
FloatPoint point = nodeAtPoint;
if (!SVGLayoutSupport::pointInClippingArea(this, point))
return false;
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
point = transform.inverse().mapPoint(point);
}
AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->calculateAnimatedLocalTransform();
if (!animatedLocalTransform.isInvertible())
return false;
point = animatedLocalTransform.inverse().mapPoint(point);
for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
LayoutObject* layoutObject = childElement->layoutObject();
if (!layoutObject)
continue;
if (!layoutObject->isSVGShape() && !layoutObject->isSVGText() && !isSVGUseElement(*childElement))
continue;
IntPoint hitPoint;
HitTestResult result(HitTestRequest::SVGClipContent, hitPoint);
if (layoutObject->nodeAtFloatPoint(result, point, HitTestForeground))
return true;
}
return false;
}
SVGResource* SVGClipPathElement::canvasResource()
{
if (!m_clipper)
m_clipper = SVGResourceClipper::create();
else
m_clipper->resetClipData();
bool bbox = clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
RenderStyle* clipPathStyle = styleForRenderer(parent()->renderer()); // FIXME: Manual style resolution is a hack
for (Node* n = firstChild(); n; n = n->nextSibling()) {
if (n->isSVGElement() && static_cast<SVGElement*>(n)->isStyledTransformable()) {
SVGStyledTransformableElement* styled = static_cast<SVGStyledTransformableElement*>(n);
RenderStyle* pathStyle = document()->styleSelector()->styleForElement(styled, clipPathStyle);
if (pathStyle->display() != NONE) {
Path pathData = styled->toClipPath();
// FIXME: How do we know the element has done a layout?
pathData.transform(styled->animatedLocalTransform());
if (!pathData.isEmpty())
m_clipper->addClipData(pathData, pathStyle->svgStyle()->clipRule(), bbox);
}
pathStyle->deref(document()->renderArena());
}
}
if (m_clipper->clipData().isEmpty()) {
Path pathData;
pathData.addRect(FloatRect());
m_clipper->addClipData(pathData, RULE_EVENODD, bbox);
}
clipPathStyle->deref(document()->renderArena());
return m_clipper.get();
}
void RenderSVGResourceClipper::drawClipMaskContent(GraphicsContext* context, const FloatRect& targetBoundingBox)
{
ASSERT(context);
AffineTransform contentTransformation;
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
contentTransformation.translate(targetBoundingBox.x(), targetBoundingBox.y());
contentTransformation.scaleNonUniform(targetBoundingBox.width(), targetBoundingBox.height());
context->concatCTM(contentTransformation);
}
if (!m_clipContentDisplayList)
createDisplayList(context, contentTransformation);
ASSERT(m_clipContentDisplayList);
context->drawDisplayList(m_clipContentDisplayList.get());
}
FloatRect LayoutSVGResourceClipper::resourceBoundingBox(
const FloatRect& referenceBox) {
// The resource has not been layouted yet. Return the reference box.
if (selfNeedsLayout())
return referenceBox;
if (m_localClipBounds.isEmpty())
calculateLocalClipBounds();
AffineTransform transform =
toSVGClipPathElement(element())->calculateTransform(
SVGElement::IncludeMotionTransform);
if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) {
transform.translate(referenceBox.x(), referenceBox.y());
transform.scaleNonUniform(referenceBox.width(), referenceBox.height());
}
return transform.mapRect(m_localClipBounds);
}
FloatRect LayoutSVGResourceClipper::resourceBoundingBox(const LayoutObject* object)
{
// Resource was not layouted yet. Give back the boundingBox of the object.
if (selfNeedsLayout())
return object->objectBoundingBox();
if (m_clipBoundaries.isEmpty())
calculateClipContentPaintInvalidationRect();
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
FloatRect objectBoundingBox = object->objectBoundingBox();
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
return transform.mapRect(m_clipBoundaries);
}
return m_clipBoundaries;
}
bool LayoutSVGResourceClipper::asPath(const AffineTransform& animatedLocalTransform, const FloatRect& referenceBox, Path& clipPath)
{
if (!calculateClipContentPathIfNeeded())
return false;
clipPath = m_clipContentPath;
// We are able to represent the clip as a path. Continue with direct clipping,
// and transform the content to userspace if necessary.
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(referenceBox.x(), referenceBox.y());
transform.scaleNonUniform(referenceBox.width(), referenceBox.height());
clipPath.transform(transform);
}
// Transform path by animatedLocalTransform.
clipPath.transform(animatedLocalTransform);
return true;
}
PassRefPtr<const SkPicture> LayoutSVGResourceClipper::createContentPicture(AffineTransform& contentTransformation, const FloatRect& targetBoundingBox,
GraphicsContext& context)
{
ASSERT(frame());
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
contentTransformation.translate(targetBoundingBox.x(), targetBoundingBox.y());
contentTransformation.scaleNonUniform(targetBoundingBox.width(), targetBoundingBox.height());
}
if (m_clipContentPicture)
return m_clipContentPicture;
SubtreeContentTransformScope contentTransformScope(contentTransformation);
// Using strokeBoundingBox (instead of paintInvalidationRectInLocalCoordinates) to avoid the intersection
// with local clips/mask, which may yield incorrect results when mixing objectBoundingBox and
// userSpaceOnUse units (http://crbug.com/294900).
FloatRect bounds = strokeBoundingBox();
SkPictureBuilder pictureBuilder(bounds, nullptr, &context);
for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
LayoutObject* layoutObject = childElement->layoutObject();
if (!layoutObject)
continue;
const ComputedStyle* style = layoutObject->style();
if (!style || style->display() == NONE || style->visibility() != VISIBLE)
continue;
bool isUseElement = isSVGUseElement(*childElement);
if (isUseElement) {
const SVGGraphicsElement* clippingElement = toSVGUseElement(*childElement).targetGraphicsElementForClipping();
if (!clippingElement)
continue;
layoutObject = clippingElement->layoutObject();
if (!layoutObject)
continue;
}
// Only shapes, paths and texts are allowed for clipping.
if (!layoutObject->isSVGShape() && !layoutObject->isSVGText())
continue;
if (isUseElement)
layoutObject = childElement->layoutObject();
// Switch to a paint behavior where all children of this <clipPath> will be laid out using special constraints:
// - fill-opacity/stroke-opacity/opacity set to 1
// - masker/filter not applied when laying out the children
// - fill is set to the initial fill paint server (solid, black)
// - stroke is set to the initial stroke paint server (none)
PaintInfo info(pictureBuilder.context(), LayoutRect::infiniteIntRect(), PaintPhaseForeground, GlobalPaintNormalPhase, PaintLayerPaintingRenderingClipPathAsMask);
layoutObject->paint(info, IntPoint());
}
m_clipContentPicture = pictureBuilder.endRecording();
return m_clipContentPicture;
}
bool RenderSVGResourceClipper::tryPathOnlyClipping(GraphicsContext* context,
const AffineTransform& animatedLocalTransform, const FloatRect& objectBoundingBox) {
// If the current clip-path gets clipped itself, we have to fallback to masking.
if (!style()->svgStyle().clipperResource().isEmpty())
return false;
WindRule clipRule = RULE_NONZERO;
Path clipPath = Path();
for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
RenderObject* renderer = childElement->renderer();
if (!renderer)
continue;
// Only shapes or paths are supported for direct clipping. We need to fallback to masking for texts.
if (renderer->isSVGText())
return false;
if (!childElement->isSVGGraphicsElement())
continue;
SVGGraphicsElement* styled = toSVGGraphicsElement(childElement);
RenderStyle* style = renderer->style();
if (!style || style->display() == NONE || style->visibility() != VISIBLE)
continue;
const SVGRenderStyle& svgStyle = style->svgStyle();
// Current shape in clip-path gets clipped too. Fallback to masking.
if (!svgStyle.clipperResource().isEmpty())
return false;
if (clipPath.isEmpty()) {
// First clip shape.
styled->toClipPath(clipPath);
clipRule = svgStyle.clipRule();
clipPath.setWindRule(clipRule);
continue;
}
if (RuntimeEnabledFeatures::pathOpsSVGClippingEnabled()) {
// Attempt to generate a combined clip path, fall back to masking if not possible.
Path subPath;
styled->toClipPath(subPath);
subPath.setWindRule(svgStyle.clipRule());
if (!clipPath.unionPath(subPath))
return false;
} else {
return false;
}
}
// Only one visible shape/path was found. Directly continue clipping and transform the content to userspace if necessary.
if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
clipPath.transform(transform);
}
// Transform path by animatedLocalTransform.
clipPath.transform(animatedLocalTransform);
// The SVG specification wants us to clip everything, if clip-path doesn't have a child.
if (clipPath.isEmpty())
clipPath.addRect(FloatRect());
context->clipPath(clipPath, clipRule);
return true;
}
bool RenderSVGResourceClipper::applyClippingToContext(RenderObject* target, const FloatRect& targetBoundingBox,
const FloatRect& paintInvalidationRect, GraphicsContext* context, ClipperState& clipperState)
{
ASSERT(target);
ASSERT(context);
ASSERT(clipperState == ClipperNotApplied);
ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());
if (paintInvalidationRect.isEmpty() || m_inClipExpansion)
return false;
TemporaryChange<bool> inClipExpansionChange(m_inClipExpansion, true);
AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->animatedLocalTransform();
// 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() && clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
ASSERT(style());
animatedLocalTransform.scale(style()->effectiveZoom());
}
// First, try to apply the clip as a clipPath.
if (tryPathOnlyClipping(context, animatedLocalTransform, targetBoundingBox)) {
clipperState = ClipperAppliedPath;
return true;
}
// Fall back to masking.
clipperState = ClipperAppliedMask;
// Mask layer start
context->beginTransparencyLayer(1, &paintInvalidationRect);
{
GraphicsContextStateSaver maskContentSaver(*context);
context->concatCTM(animatedLocalTransform);
// clipPath can also be clipped by another clipPath.
SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
RenderSVGResourceClipper* clipPathClipper = resources ? resources->clipper() : 0;
ClipperState clipPathClipperState = ClipperNotApplied;
if (clipPathClipper && !clipPathClipper->applyClippingToContext(this, targetBoundingBox, paintInvalidationRect, context, clipPathClipperState)) {
// FIXME: Awkward state micro-management. Ideally, GraphicsContextStateSaver should
// a) pop saveLayers also
// b) pop multiple states if needed (similarly to SkCanvas::restoreToCount())
// Then we should be able to replace this mess with a single, top-level GCSS.
maskContentSaver.restore();
context->restoreLayer();
return false;
}
drawClipMaskContent(context, targetBoundingBox);
if (clipPathClipper)
clipPathClipper->postApplyStatefulResource(this, context, clipPathClipperState);
}
// Masked content layer start.
context->beginLayer(1, CompositeSourceIn, &paintInvalidationRect);
return true;
}
