コード例 #1
0
bool RenderSVGTransformableContainer::calculateLocalTransform()
{
    SVGGraphicsElement& element = graphicsElement();

    // If we're either the renderer for a <use> element, or for any <g> element inside the shadow
    // tree, that was created during the use/symbol/svg expansion in SVGUseElement. These containers
    // need to respect the translations induced by their corresponding use elements x/y attributes.
    SVGUseElement* useElement = 0;
    if (isSVGUseElement(element))
        useElement = &toSVGUseElement(element);
    else if (element.isInShadowTree() && isSVGGElement(element)) {
        SVGElement* correspondingElement = element.correspondingElement();
        if (correspondingElement && isSVGUseElement(correspondingElement))
            useElement = toSVGUseElement(correspondingElement);
    }

    if (useElement) {
        SVGLengthContext lengthContext(useElement);
        FloatSize translation(useElement->x().value(lengthContext), useElement->y().value(lengthContext));
        if (translation != m_lastTranslation)
            m_needsTransformUpdate = true;
        m_lastTranslation = translation;
    }

    m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
    if (!m_needsTransformUpdate)
        return false;

    m_localTransform = element.animatedLocalTransform();
    m_localTransform.translate(m_lastTranslation.width(), m_lastTranslation.height());
    m_needsTransformUpdate = false;
    return true;
}
コード例 #2
0
void SVGUseElement::buildInstanceTree(SVGElement* target, SVGElementInstance* targetInstance, bool& foundProblem, bool foundUse)
{
    ASSERT(target);
    ASSERT(targetInstance);

    // Spec: If the referenced object is itself a 'use', or if there are 'use' subelements within the referenced
    // object, the instance tree will contain recursive expansion of the indirect references to form a complete tree.
    bool targetHasUseTag = target->hasTagName(SVGNames::useTag);
    SVGElement* newTarget = 0;
    if (targetHasUseTag) {
        foundProblem = hasCycleUseReferencing(toSVGUseElement(target), targetInstance, newTarget);
        if (foundProblem)
            return;

        // We only need to track first degree <use> dependencies. Indirect references are handled
        // as the invalidation bubbles up the dependency chain.
        if (!foundUse) {
            document().accessSVGExtensions()->addElementReferencingTarget(this, target);
            foundUse = true;
        }
    } else if (isDisallowedElement(*target)) {
        foundProblem = true;
        return;
    }

    // A general description from the SVG spec, describing what buildInstanceTree() actually does.
    //
    // Spec: If the 'use' element references a 'g' which contains two 'rect' elements, then the instance tree
    // contains three SVGElementInstance objects, a root SVGElementInstance object whose correspondingElement
    // is the SVGGElement object for the 'g', and then two child SVGElementInstance objects, each of which has
    // its correspondingElement that is an SVGRectElement object.

    for (auto& element : childrenOfType<SVGElement>(*target)) {
        // Skip any non-svg nodes or any disallowed element.
        if (isDisallowedElement(element))
            continue;

        // Create SVGElementInstance object, for both container/non-container nodes.
        RefPtr<SVGElementInstance> instance = SVGElementInstance::create(this, 0, &element);
        SVGElementInstance* instancePtr = instance.get();
        targetInstance->appendChild(instance.release());

        // Enter recursion, appending new instance tree nodes to the "instance" object.
        buildInstanceTree(&element, instancePtr, foundProblem, foundUse);
        if (foundProblem)
            return;
    }

    if (!targetHasUseTag || !newTarget)
        return;

    RefPtr<SVGElementInstance> newInstance = SVGElementInstance::create(this, toSVGUseElement(target), newTarget);
    SVGElementInstance* newInstancePtr = newInstance.get();
    targetInstance->appendChild(newInstance.release());
    buildInstanceTree(newTarget, newInstancePtr, foundProblem, foundUse);
}
コード例 #3
0
ファイル: EventDispatcher.cpp プロジェクト: kodybrown/webkit
inline EventTarget& eventTargetRespectingTargetRules(Node& referenceNode)
{
    if (referenceNode.isPseudoElement()) {
        EventTarget* hostElement = toPseudoElement(referenceNode).hostElement();
        ASSERT(hostElement);
        return *hostElement;
    }

#if ENABLE(SVG)
    if (!referenceNode.isSVGElement() || !referenceNode.isInShadowTree())
        return referenceNode;

    // Spec: The event handling for the non-exposed tree works as if the referenced element had been textually included
    // as a deeply cloned child of the 'use' element, except that events are dispatched to the SVGElementInstance objects
    Node* rootNode = referenceNode.treeScope().rootNode();
    Element* shadowHostElement = rootNode->isShadowRoot() ? toShadowRoot(rootNode)->hostElement() : 0;
    // At this time, SVG nodes are not supported in non-<use> shadow trees.
    if (!shadowHostElement || !shadowHostElement->hasTagName(SVGNames::useTag))
        return referenceNode;
    SVGUseElement* useElement = toSVGUseElement(shadowHostElement);
    if (SVGElementInstance* instance = useElement->instanceForShadowTreeElement(&referenceNode))
        return *instance;
#endif

    return referenceNode;
}
コード例 #4
0
void SVGElement::buildPendingResourcesIfNeeded()
{
    Document& document = this->document();
    if (!needsPendingResourceHandling() || !inDocument() || inUseShadowTree())
        return;

    SVGDocumentExtensions& extensions = document.accessSVGExtensions();
    AtomicString resourceId = getIdAttribute();
    if (!extensions.hasPendingResource(resourceId))
        return;

    // Mark pending resources as pending for removal.
    extensions.markPendingResourcesForRemoval(resourceId);

    // Rebuild pending resources for each client of a pending resource that is being removed.
    while (Element* clientElement = extensions.removeElementFromPendingResourcesForRemoval(resourceId)) {
        ASSERT(clientElement->hasPendingResources());
        if (clientElement->hasPendingResources()) {
            // FIXME: Ideally we'd always resolve pending resources async instead of inside
            // insertedInto and svgAttributeChanged. For now we only do it for <use> since
            // that would stamp out DOM.
            if (isSVGUseElement(clientElement))
                toSVGUseElement(clientElement)->invalidateShadowTree();
            else
                clientElement->buildPendingResource();
            extensions.clearHasPendingResourcesIfPossible(clientElement);
        }
    }
}
コード例 #5
0
String SVGElement::title() const
{
    // According to spec, we should not return titles when hovering over root <svg> elements (those
    // <title> elements are the title of the document, not a tooltip) so we instantly return.
    if (isOutermostSVGSVGElement())
        return String();

    // Walk up the tree, to find out whether we're inside a <use> shadow tree, to find the right title.
    if (isInShadowTree()) {
        Element* shadowHostElement = toShadowRoot(treeScope().rootNode()).host();
        // At this time, SVG nodes are not allowed in non-<use> shadow trees, so any shadow root we do
        // have should be a use. The assert and following test is here to catch future shadow DOM changes
        // that do enable SVG in a shadow tree.
        ASSERT(!shadowHostElement || isSVGUseElement(*shadowHostElement));
        if (isSVGUseElement(shadowHostElement)) {
            SVGUseElement& useElement = toSVGUseElement(*shadowHostElement);

            // If the <use> title is not empty we found the title to use.
            String useTitle(useElement.title());
            if (!useTitle.isEmpty())
                return useTitle;
        }
    }

    // If we aren't an instance in a <use> or the <use> title was not found, then find the first
    // <title> child of this element.
    // If a title child was found, return the text contents.
    if (Element* titleElement = Traversal<SVGTitleElement>::firstChild(*this))
        return titleElement->innerText();

    // Otherwise return a null/empty string.
    return String();
}
コード例 #6
0
SVGUseElement* SVGElement::correspondingUseElement() const
{
    if (ShadowRoot* root = containingShadowRoot()) {
        if (isSVGUseElement(root->host()) && (root->type() == ShadowRootType::UserAgent))
            return toSVGUseElement(root->host());
    }
    return nullptr;
}
コード例 #7
0
bool SVGUseElement::instanceTreeIsLoading(const SVGElement* targetInstance)
{
    for (const SVGElement* element = targetInstance; element; element = Traversal<SVGElement>::next(*element, targetInstance)) {
        if (isSVGUseElement(*element) && toSVGUseElement(*element).resourceIsStillLoading())
            return true;
    }
    return false;
}
コード例 #8
0
void SVGUseElement::expandUseElementsInShadowTree(Node* element)
{
    // Why expand the <use> elements in the shadow tree here, and not just
    // do this directly in buildShadowTree, if we encounter a <use> element?
    //
    // Short answer: Because we may miss to expand some elements. Ie. if a <symbol>
    // contains <use> tags, we'd miss them. So once we're done with settin' up the
    // actual shadow tree (after the special case modification for svg/symbol) we have
    // to walk it completely and expand all <use> elements.
    if (element->hasTagName(SVGNames::useTag)) {
        SVGUseElement* use = toSVGUseElement(element);
        ASSERT(!use->cachedDocumentIsStillLoading());

        ASSERT(referencedDocument());
        Element* targetElement = SVGURIReference::targetElementFromIRIString(use->href(), *referencedDocument());
        SVGElement* target = 0;
        if (targetElement && targetElement->isSVGElement())
            target = toSVGElement(targetElement);

        // Don't ASSERT(target) here, it may be "pending", too.
        // Setup sub-shadow tree root node
        RefPtr<SVGGElement> cloneParent = SVGGElement::create(SVGNames::gTag, *referencedDocument());
        use->cloneChildNodes(cloneParent.get());

        // Spec: In the generated content, the 'use' will be replaced by 'g', where all attributes from the
        // 'use' element except for x, y, width, height and xlink:href are transferred to the generated 'g' element.
        transferUseAttributesToReplacedElement(use, cloneParent.get());

        if (target && !isDisallowedElement(*target)) {
            RefPtr<Element> newChild = target->cloneElementWithChildren();
            ASSERT(newChild->isSVGElement());
            cloneParent->appendChild(newChild.release());
        }

        // We don't walk the target tree element-by-element, and clone each element,
        // but instead use cloneElementWithChildren(). This is an optimization for the common
        // case where <use> doesn't contain disallowed elements (ie. <foreignObject>).
        // Though if there are disallowed elements in the subtree, we have to remove them.
        // For instance: <use> on <g> containing <foreignObject> (indirect case).
        if (subtreeContainsDisallowedElement(*cloneParent))
            removeDisallowedElementsFromSubtree(*cloneParent);

        RefPtr<Node> replacingElement(cloneParent.get());

        // Replace <use> with referenced content.
        ASSERT(use->parentNode());
        use->parentNode()->replaceChild(cloneParent.release(), use);

        // Expand the siblings because the *element* is replaced and we will
        // lose the sibling chain when we are back from recursion.
        element = replacingElement.get();
        for (RefPtr<Node> sibling = element->nextSibling(); sibling; sibling = sibling->nextSibling())
            expandUseElementsInShadowTree(sibling.get());
    }

    for (RefPtr<Node> child = element->firstChild(); child; child = child->nextSibling())
        expandUseElementsInShadowTree(child.get());
}
コード例 #9
0
void RenderSVGResourceClipper::createDisplayList(GraphicsContext* context,
    const AffineTransform& contentTransformation)
{
    ASSERT(context);
    ASSERT(frame());

    // 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();
    context->beginRecording(bounds);

    // Switch to a paint behavior where all children of this <clipPath> will be rendered using special constraints:
    // - fill-opacity/stroke-opacity/opacity set to 1
    // - masker/filter not applied when rendering the children
    // - fill is set to the initial fill paint server (solid, black)
    // - stroke is set to the initial stroke paint server (none)
    PaintBehavior oldBehavior = frame()->view()->paintBehavior();
    frame()->view()->setPaintBehavior(oldBehavior | PaintBehaviorRenderingSVGMask);

    for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
        RenderObject* renderer = childElement->renderer();
        if (!renderer)
            continue;

        RenderStyle* style = renderer->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
            continue;

        WindRule newClipRule = style->svgStyle().clipRule();
        bool isUseElement = isSVGUseElement(*childElement);
        if (isUseElement) {
            SVGUseElement& useElement = toSVGUseElement(*childElement);
            renderer = useElement.rendererClipChild();
            if (!renderer)
                continue;
            if (!useElement.hasAttribute(SVGNames::clip_ruleAttr))
                newClipRule = renderer->style()->svgStyle().clipRule();
        }

        // Only shapes, paths and texts are allowed for clipping.
        if (!renderer->isSVGShape() && !renderer->isSVGText())
            continue;

        context->setFillRule(newClipRule);

        if (isUseElement)
            renderer = childElement->renderer();

        SVGRenderingContext::renderSubtree(context, renderer, contentTransformation);
    }

    frame()->view()->setPaintBehavior(oldBehavior);

    m_clipContentDisplayList = context->endRecording();
}
コード例 #10
0
PassRefPtr<DisplayList> RenderSVGResourceClipper::asDisplayList(GraphicsContext* context,
    const AffineTransform& contentTransformation)
{
    ASSERT(context);
    ASSERT(frame());

    context->beginRecording(repaintRectInLocalCoordinates());

    // Switch to a paint behavior where all children of this <clipPath> will be rendered using special constraints:
    // - fill-opacity/stroke-opacity/opacity set to 1
    // - masker/filter not applied when rendering the children
    // - fill is set to the initial fill paint server (solid, black)
    // - stroke is set to the initial stroke paint server (none)
    PaintBehavior oldBehavior = frame()->view()->paintBehavior();
    frame()->view()->setPaintBehavior(oldBehavior | PaintBehaviorRenderingSVGMask);

    for (Node* childNode = element()->firstChild(); childNode; childNode = childNode->nextSibling()) {
        RenderObject* renderer = childNode->renderer();
        if (!childNode->isSVGElement() || !renderer)
            continue;

        RenderStyle* style = renderer->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
            continue;

        WindRule newClipRule = style->svgStyle()->clipRule();
        bool isUseElement = childNode->hasTagName(SVGNames::useTag);
        if (isUseElement) {
            SVGUseElement* useElement = toSVGUseElement(childNode);
            renderer = useElement->rendererClipChild();
            if (!renderer)
                continue;
            if (!useElement->hasAttribute(SVGNames::clip_ruleAttr))
                newClipRule = renderer->style()->svgStyle()->clipRule();
        }

        // Only shapes, paths and texts are allowed for clipping.
        if (!renderer->isSVGShape() && !renderer->isSVGText())
            continue;

        context->setFillRule(newClipRule);

        if (isUseElement)
            renderer = childNode->renderer();

        SVGRenderingContext::renderSubtree(context, renderer, contentTransformation);
    }

    frame()->view()->setPaintBehavior(oldBehavior);

    return context->endRecording();
}
コード例 #11
0
static void dumpInstanceTree(unsigned int& depth, String& text, SVGElementInstance* targetInstance)
{
    SVGElement* element = targetInstance->correspondingElement();
    ASSERT(element);

    if (element->hasTagName(SVGNames::useTag)) {
        if (toSVGUseElement(element)->cachedDocumentIsStillLoading())
            return;
    }

    SVGElement* shadowTreeElement = targetInstance->shadowTreeElement();
    ASSERT(shadowTreeElement);

    SVGUseElement* directUseElement = targetInstance->directUseElement();
    String directUseElementName = directUseElement ? directUseElement->nodeName() : "null";

    String elementId = element->getIdAttribute();
    String elementNodeName = element->nodeName();
    String shadowTreeElementNodeName = shadowTreeElement->nodeName();
    String parentNodeName = element->parentNode() ? element->parentNode()->nodeName() : "null";
    String firstChildNodeName = element->firstChild() ? element->firstChild()->nodeName() : "null";

    for (unsigned int i = 0; i < depth; ++i)
        text += "  ";

    text += String::format("SVGElementInstance this=%p, (parentNode=%s (%p), firstChild=%s (%p), correspondingElement=%s (%p), directUseElement=%s (%p), shadowTreeElement=%s (%p), id=%s)\n",
                           targetInstance, parentNodeName.latin1().data(), element->parentNode(), firstChildNodeName.latin1().data(), element->firstChild(),
                           elementNodeName.latin1().data(), element, directUseElementName.latin1().data(), directUseElement, shadowTreeElementNodeName.latin1().data(), shadowTreeElement, elementId.latin1().data());

    for (unsigned int i = 0; i < depth; ++i)
        text += "  ";

    const HashSet<SVGElementInstance*>& elementInstances = element->instancesForElement();
    text += "Corresponding element is associated with " + String::number(elementInstances.size()) + " instance(s):\n";

    const HashSet<SVGElementInstance*>::const_iterator end = elementInstances.end();
    for (HashSet<SVGElementInstance*>::const_iterator it = elementInstances.begin(); it != end; ++it) {
        for (unsigned int i = 0; i < depth; ++i)
            text += "  ";

        text += String::format(" -> SVGElementInstance this=%p, (refCount: %i, shadowTreeElement in document? %i)\n",
                               *it, (*it)->refCount(), (*it)->shadowTreeElement()->inDocument());
    }

    ++depth;

    for (SVGElementInstance* instance = targetInstance->firstChild(); instance; instance = instance->nextSibling())
        dumpInstanceTree(depth, text, instance);

    --depth;
}
コード例 #12
0
bool LayoutSVGTransformableContainer::calculateLocalTransform()
{
    SVGGraphicsElement* element = toSVGGraphicsElement(this->element());
    ASSERT(element);

    // If we're either the layoutObject for a <use> element, or for any <g> element inside the shadow
    // tree, that was created during the use/symbol/svg expansion in SVGUseElement. These containers
    // need to respect the translations induced by their corresponding use elements x/y attributes.
    SVGUseElement* useElement = nullptr;
    if (isSVGUseElement(*element)) {
        useElement = toSVGUseElement(element);
    } else if (isSVGGElement(*element) && toSVGGElement(element)->inUseShadowTree()) {
        SVGElement* correspondingElement = element->correspondingElement();
        if (isSVGUseElement(correspondingElement))
            useElement = toSVGUseElement(correspondingElement);
    }

    if (useElement) {
        SVGLengthContext lengthContext(useElement);
        FloatSize translation(
            useElement->x()->currentValue()->value(lengthContext),
            useElement->y()->currentValue()->value(lengthContext));
        if (translation != m_additionalTranslation)
            m_needsTransformUpdate = true;
        m_additionalTranslation = translation;
    }

    m_didTransformToRootUpdate = m_needsTransformUpdate || SVGLayoutSupport::transformToRootChanged(parent());
    if (!m_needsTransformUpdate)
        return false;

    m_localTransform = element->calculateAnimatedLocalTransform();
    m_localTransform.translate(m_additionalTranslation.width(), m_additionalTranslation.height());
    m_needsTransformUpdate = false;
    return true;
}
コード例 #13
0
ファイル: EventPath.cpp プロジェクト: coinpayee/blink
EventTarget* EventPath::eventTargetRespectingTargetRules(Node* referenceNode)
{
    ASSERT(referenceNode);

    if (referenceNode->isPseudoElement())
        return referenceNode->parentNode();

    if (!usesDeprecatedSVGUseTreeEventRules(referenceNode))
        return referenceNode;

    // Spec: The event handling for the non-exposed tree works as if the referenced element had been textually included
    // as a deeply cloned child of the 'use' element, except that events are dispatched to the SVGElementInstance objects.
    Node& rootNode = referenceNode->treeScope().rootNode();
    Element* shadowHostElement = rootNode.isShadowRoot() ? toShadowRoot(rootNode).host() : 0;
    // At this time, SVG nodes are not supported in non-<use> shadow trees.
    if (!isSVGUseElement(shadowHostElement))
        return referenceNode;
    SVGUseElement& useElement = toSVGUseElement(*shadowHostElement);
    if (SVGElementInstance* instance = useElement.instanceForShadowTreeElement(referenceNode))
        return instance;

    return referenceNode;
}
コード例 #14
0
bool SVGUseElement::expandUseElementsInShadowTree(SVGElement* element)
{
    ASSERT(element);
    // Why expand the <use> elements in the shadow tree here, and not just
    // do this directly in buildShadowTree, if we encounter a <use> element?
    //
    // Short answer: Because we may miss to expand some elements. For example, if a <symbol>
    // contains <use> tags, we'd miss them. So once we're done with setting up the
    // actual shadow tree (after the special case modification for svg/symbol) we have
    // to walk it completely and expand all <use> elements.
    if (isSVGUseElement(*element)) {
        SVGUseElement* use = toSVGUseElement(element);
        ASSERT(!use->resourceIsStillLoading());

        SVGElement* target = 0;
        if (hasCycleUseReferencing(toSVGUseElement(use->correspondingElement()), use, target))
            return false;

        if (target && isDisallowedElement(target))
            return false;
        // Don't ASSERT(target) here, it may be "pending", too.
        // Setup sub-shadow tree root node
        RefPtrWillBeRawPtr<SVGGElement> cloneParent = SVGGElement::create(referencedScope()->document());
        cloneParent->setCorrespondingElement(use->correspondingElement());

        // Move already cloned elements to the new <g> element
        for (RefPtrWillBeRawPtr<Node> child = use->firstChild(); child; ) {
            RefPtrWillBeRawPtr<Node> nextChild = child->nextSibling();
            cloneParent->appendChild(child);
            child = nextChild.release();
        }

        // Spec: In the generated content, the 'use' will be replaced by 'g', where all attributes from the
        // 'use' element except for x, y, width, height and xlink:href are transferred to the generated 'g' element.
        transferUseAttributesToReplacedElement(use, cloneParent.get());

        if (target) {
            RefPtrWillBeRawPtr<Node> newChild = cloneNodeAndAssociate(*target);
            ASSERT(newChild->isSVGElement());
            transferUseWidthAndHeightIfNeeded(*use, toSVGElement(newChild.get()), *target);
            cloneParent->appendChild(newChild.release());
        }

        // We don't walk the target tree element-by-element, and clone each element,
        // but instead use cloneElementWithChildren(). This is an optimization for the common
        // case where <use> doesn't contain disallowed elements (ie. <foreignObject>).
        // Though if there are disallowed elements in the subtree, we have to remove them.
        // For instance: <use> on <g> containing <foreignObject> (indirect case).
        if (subtreeContainsDisallowedElement(cloneParent.get()))
            removeDisallowedElementsFromSubtree(*cloneParent);

        RefPtrWillBeRawPtr<SVGElement> replacingElement(cloneParent.get());

        // Replace <use> with referenced content.
        ASSERT(use->parentNode());
        use->parentNode()->replaceChild(cloneParent.release(), use);

        // Expand the siblings because the *element* is replaced and we will
        // lose the sibling chain when we are back from recursion.
        element = replacingElement.get();
        for (RefPtrWillBeRawPtr<SVGElement> sibling = Traversal<SVGElement>::nextSibling(*element); sibling; sibling = Traversal<SVGElement>::nextSibling(*sibling)) {
            if (!expandUseElementsInShadowTree(sibling.get()))
                return false;
        }
    }

    for (RefPtrWillBeRawPtr<SVGElement> child = Traversal<SVGElement>::firstChild(*element); child; child = Traversal<SVGElement>::nextSibling(*child)) {
        if (!expandUseElementsInShadowTree(child.get()))
            return false;
    }
    return true;
}
コード例 #15
0
bool LayoutSVGResourceClipper::calculateClipContentPathIfNeeded()
{
    if (!m_clipContentPath.isEmpty())
        return true;

    // If the current clip-path gets clipped itself, we have to fallback to masking.
    if (style()->svgStyle().hasClipper())
        return false;

    unsigned opCount = 0;
    bool usingBuilder = false;
    SkOpBuilder clipPathBuilder;

    for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
        LayoutObject* childLayoutObject = childElement->layoutObject();
        if (!childLayoutObject)
            continue;
        // Only shapes or paths are supported for direct clipping. We need to fallback to masking for texts.
        if (childLayoutObject->isSVGText()) {
            m_clipContentPath.clear();
            return false;
        }
        if (!childElement->isSVGGraphicsElement())
            continue;

        const ComputedStyle* style = childLayoutObject->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
            continue;

        // Current shape in clip-path gets clipped too. Fallback to masking.
        if (style->svgStyle().hasClipper()) {
            m_clipContentPath.clear();
            return false;
        }

        // First clip shape.
        if (m_clipContentPath.isEmpty()) {
            if (isSVGGeometryElement(childElement))
                toSVGGeometryElement(childElement)->toClipPath(m_clipContentPath);
            else if (isSVGUseElement(childElement))
                toSVGUseElement(childElement)->toClipPath(m_clipContentPath);

            continue;
        }

        // Multiple shapes require PathOps. In some degenerate cases PathOps can exhibit quadratic
        // behavior, so we cap the number of ops to a reasonable count.
        const unsigned kMaxOps = 42;
        if (!RuntimeEnabledFeatures::pathOpsSVGClippingEnabled() || ++opCount > kMaxOps) {
            m_clipContentPath.clear();
            return false;
        }

        // Second clip shape => start using the builder.
        if (!usingBuilder) {
            clipPathBuilder.add(m_clipContentPath.skPath(), kUnion_SkPathOp);
            usingBuilder = true;
        }

        Path subPath;
        if (isSVGGeometryElement(childElement))
            toSVGGeometryElement(childElement)->toClipPath(subPath);
        else if (isSVGUseElement(childElement))
            toSVGUseElement(childElement)->toClipPath(subPath);

        clipPathBuilder.add(subPath.skPath(), kUnion_SkPathOp);
    }

    if (usingBuilder) {
        SkPath resolvedPath;
        clipPathBuilder.resolve(&resolvedPath);
        m_clipContentPath = resolvedPath;
    }

    return true;
}
コード例 #16
0
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;
}
コード例 #17
0
bool RenderSVGResourceClipper::drawContentIntoMaskImage(ClipperData* clipperData, const FloatRect& objectBoundingBox)
{
    ASSERT(clipperData);
    ASSERT(clipperData->clipMaskImage);

    GraphicsContext* maskContext = clipperData->clipMaskImage->context();
    ASSERT(maskContext);

    AffineTransform maskContentTransformation;
    if (clipPathElement().clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        maskContentTransformation.translate(objectBoundingBox.x(), objectBoundingBox.y());
        maskContentTransformation.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
        maskContext->concatCTM(maskContentTransformation);
    }

    // Switch to a paint behavior where all children of this <clipPath> will be rendered using special constraints:
    // - fill-opacity/stroke-opacity/opacity set to 1
    // - masker/filter not applied when rendering the children
    // - fill is set to the initial fill paint server (solid, black)
    // - stroke is set to the initial stroke paint server (none)
    PaintBehavior oldBehavior = view().frameView().paintBehavior();
    view().frameView().setPaintBehavior(oldBehavior | PaintBehaviorRenderingSVGMask);

    // Draw all clipPath children into a global mask.
    auto children = childrenOfType<SVGElement>(clipPathElement());
    for (auto it = children.begin(), end = children.end(); it != end; ++it) {
        SVGElement& child = *it;
        auto renderer = child.renderer();
        if (!renderer)
            continue;
        if (renderer->needsLayout()) {
            view().frameView().setPaintBehavior(oldBehavior);
            return false;
        }
        RenderStyle* style = renderer->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
            continue;

        WindRule newClipRule = style->svgStyle()->clipRule();
        bool isUseElement = child.hasTagName(SVGNames::useTag);
        if (isUseElement) {
            SVGUseElement& useElement = toSVGUseElement(child);
            renderer = useElement.rendererClipChild();
            if (!renderer)
                continue;
            if (!useElement.hasAttribute(SVGNames::clip_ruleAttr))
                newClipRule = renderer->style()->svgStyle()->clipRule();
        }

        // Only shapes, paths and texts are allowed for clipping.
        if (!renderer->isSVGShape() && !renderer->isSVGText())
            continue;

        maskContext->setFillRule(newClipRule);

        // In the case of a <use> element, we obtained its renderere above, to retrieve its clipRule.
        // We have to pass the <use> renderer itself to renderSubtreeToImageBuffer() to apply it's x/y/transform/etc. values when rendering.
        // So if isUseElement is true, refetch the childNode->renderer(), as renderer got overriden above.
        SVGRenderingContext::renderSubtreeToImageBuffer(clipperData->clipMaskImage.get(), isUseElement ? *child.renderer() : *renderer, maskContentTransformation);
    }

    view().frameView().setPaintBehavior(oldBehavior);
    return true;
}