void TreeScope::setParentTreeScope(TreeScope& newParentScope)
{
// A document node cannot be re-parented.
ASSERT(!rootNode().isDocumentNode());
newParentScope.guardRef();
if (m_parentTreeScope)
m_parentTreeScope->guardDeref();
m_parentTreeScope = &newParentScope;
setDocument(newParentScope.document());
}
RelatedNodeRetargeter::RelatedNodeRetargeter(Node& relatedNode, Node& target)
: m_relatedNode(relatedNode)
, m_retargetedRelatedNode(&relatedNode)
{
auto& targetTreeScope = target.treeScope();
TreeScope* currentTreeScope = &m_relatedNode.treeScope();
if (LIKELY(currentTreeScope == &targetTreeScope && target.inDocument() && m_relatedNode.inDocument()))
return;
if (¤tTreeScope->documentScope() != &targetTreeScope.documentScope()) {
m_hasDifferentTreeRoot = true;
m_retargetedRelatedNode = nullptr;
return;
}
if (relatedNode.inDocument() != target.inDocument()) {
m_hasDifferentTreeRoot = true;
m_retargetedRelatedNode = moveOutOfAllShadowRoots(relatedNode);
return;
}
collectTreeScopes();
// FIXME: We should collect this while constructing the event path.
Vector<TreeScope*, 8> targetTreeScopeAncestors;
for (TreeScope* currentTreeScope = &targetTreeScope; currentTreeScope; currentTreeScope = currentTreeScope->parentTreeScope())
targetTreeScopeAncestors.append(currentTreeScope);
ASSERT_WITH_SECURITY_IMPLICATION(!targetTreeScopeAncestors.isEmpty());
unsigned i = m_ancestorTreeScopes.size();
unsigned j = targetTreeScopeAncestors.size();
ASSERT_WITH_SECURITY_IMPLICATION(m_ancestorTreeScopes.last() == targetTreeScopeAncestors.last());
while (m_ancestorTreeScopes[i - 1] == targetTreeScopeAncestors[j - 1]) {
i--;
j--;
if (!i || !j)
break;
}
bool lowestCommonAncestorIsDocumentScope = i + 1 == m_ancestorTreeScopes.size();
if (lowestCommonAncestorIsDocumentScope && !relatedNode.inDocument() && !target.inDocument()) {
Node& targetAncestorInDocumentScope = i ? *downcast<ShadowRoot>(m_ancestorTreeScopes[i - 1]->rootNode()).shadowHost() : target;
Node& relatedNodeAncestorInDocumentScope = j ? *downcast<ShadowRoot>(targetTreeScopeAncestors[j - 1]->rootNode()).shadowHost() : relatedNode;
if (targetAncestorInDocumentScope.rootNode() != relatedNodeAncestorInDocumentScope.rootNode()) {
m_hasDifferentTreeRoot = true;
m_retargetedRelatedNode = moveOutOfAllShadowRoots(relatedNode);
return;
}
}
m_lowestCommonAncestorIndex = i;
m_retargetedRelatedNode = nodeInLowestCommonAncestor();
}
void HTMLLabelElement::updateLabel(TreeScope& scope, const AtomicString& oldForAttributeValue, const AtomicString& newForAttributeValue)
{
if (!inDocument())
return;
if (oldForAttributeValue == newForAttributeValue)
return;
if (!oldForAttributeValue.isEmpty())
scope.removeLabel(oldForAttributeValue, this);
if (!newForAttributeValue.isEmpty())
scope.addLabel(newForAttributeValue, this);
}
void DocumentOrderedMap::add(const AtomicStringImpl& key, Element& element, const TreeScope& treeScope)
{
ASSERT_WITH_SECURITY_IMPLICATION(element.isInTreeScope());
ASSERT_WITH_SECURITY_IMPLICATION(treeScope.rootNode()->containsIncludingShadowDOM(&element));
if (!element.isInTreeScope() || &element.document() != treeScope.documentScope())
return;
Map::AddResult addResult = m_map.add(&key, MapEntry(&element));
if (addResult.isNewEntry)
return;
MapEntry& entry = addResult.iterator->value;
ASSERT_WITH_SECURITY_IMPLICATION(entry.count);
entry.element = 0;
entry.count++;
entry.orderedList.clear();
}
void RelatedNodeRetargeter::moveToNewTreeScope(TreeScope* previousTreeScope, TreeScope& newTreeScope)
{
if (m_hasDifferentTreeRoot)
return;
auto& currentRelatedNodeScope = m_retargetedRelatedNode->treeScope();
if (previousTreeScope != ¤tRelatedNodeScope) {
// currentRelatedNode is still outside our shadow tree. New tree scope may contain currentRelatedNode
// but there is no need to re-target it. Moving into a slot (thereby a deeper shadow tree) doesn't matter.
return;
}
bool enteredSlot = newTreeScope.parentTreeScope() == previousTreeScope;
if (enteredSlot) {
if (m_lowestCommonAncestorIndex) {
if (m_ancestorTreeScopes.isEmpty())
collectTreeScopes();
bool relatedNodeIsInSlot = m_ancestorTreeScopes[m_lowestCommonAncestorIndex - 1] == &newTreeScope;
if (relatedNodeIsInSlot) {
m_lowestCommonAncestorIndex--;
m_retargetedRelatedNode = nodeInLowestCommonAncestor();
ASSERT(&newTreeScope == &m_retargetedRelatedNode->treeScope());
}
} else
ASSERT(m_retargetedRelatedNode == &m_relatedNode);
} else {
ASSERT(previousTreeScope->parentTreeScope() == &newTreeScope);
m_lowestCommonAncestorIndex++;
ASSERT_WITH_SECURITY_IMPLICATION(m_ancestorTreeScopes.isEmpty() || m_lowestCommonAncestorIndex < m_ancestorTreeScopes.size());
m_retargetedRelatedNode = downcast<ShadowRoot>(currentRelatedNodeScope.rootNode()).host();
ASSERT(&newTreeScope == &m_retargetedRelatedNode->treeScope());
}
}
void RelatedNodeRetargeter::collectTreeScopes()
{
ASSERT(m_ancestorTreeScopes.isEmpty());
for (TreeScope* currentTreeScope = &m_relatedNode.treeScope(); currentTreeScope; currentTreeScope = currentTreeScope->parentTreeScope())
m_ancestorTreeScopes.append(currentTreeScope);
ASSERT_WITH_SECURITY_IMPLICATION(!m_ancestorTreeScopes.isEmpty());
}
void TreeScope::setParentTreeScope(TreeScope& newParentScope) {
// A document node cannot be re-parented.
DCHECK(!rootNode().isDocumentNode());
m_parentTreeScope = &newParentScope;
setDocument(newParentScope.document());
}
void DocumentOrderedMap::add(const AtomicStringImpl& key, Element& element, const TreeScope& treeScope)
{
UNUSED_PARAM(treeScope);
ASSERT_WITH_SECURITY_IMPLICATION(element.isInTreeScope());
ASSERT_WITH_SECURITY_IMPLICATION(treeScope.rootNode().containsIncludingShadowDOM(&element));
if (!element.isInTreeScope())
return;
Map::AddResult addResult = m_map.ensure(&key, [&element] {
return MapEntry(&element);
});
MapEntry& entry = addResult.iterator->value;
#if !ASSERT_DISABLED || ENABLE(SECURITY_ASSERTIONS)
ASSERT_WITH_SECURITY_IMPLICATION(!entry.registeredElements.contains(&element));
entry.registeredElements.add(&element);
#endif
if (addResult.isNewEntry)
return;
ASSERT_WITH_SECURITY_IMPLICATION(entry.count);
entry.element = nullptr;
entry.count++;
entry.orderedList.clear();
}
static Position adjustPositionForStart(const Position& currentPosition, Node* endContainerNode)
{
TreeScope* treeScope = endContainerNode->treeScope();
ASSERT(currentPosition.containerNode()->treeScope() != treeScope);
if (Node* ancestor = treeScope->ancestorInThisScope(currentPosition.containerNode())) {
if (ancestor->contains(endContainerNode))
return positionBeforeNode(ancestor);
return positionAfterNode(ancestor);
}
if (Node* firstChild = treeScope->rootNode()->firstChild())
return positionBeforeNode(firstChild);
return Position();
}
TreeScopeEventContext::TreeScopeEventContext(TreeScope& treeScope)
: m_treeScope(treeScope)
, m_rootNode(treeScope.rootNode())
, m_containingClosedShadowTree(nullptr)
, m_preOrder(-1)
, m_postOrder(-1)
{
}
AtomicString SVGURIReference::fragmentIdentifierFromIRIString(
const String& urlString,
const TreeScope& treeScope) {
SVGURLReferenceResolver resolver(urlString, treeScope.document());
if (!resolver.isLocal())
return emptyAtom;
return resolver.fragmentIdentifier();
}
void InsertionPoint::attach()
{
TreeScope* scope = treeScope();
if (scope->isShadowRoot()) {
ShadowRoot* root = toShadowRoot(scope);
if (doesSelectFromHostChildren()) {
distributeHostChildren(root->tree());
attachDistributedNode();
} else if (!root->olderShadowRoot()->assignedTo()) {
ASSERT(!root->olderShadowRoot()->attached());
assignShadowRoot(root->olderShadowRoot());
root->olderShadowRoot()->attach();
}
}
HTMLElement::attach();
}
EventTarget* EventPath::findRelatedNode(TreeScope& scope, RelatedTargetMap& relatedTargetMap)
{
WillBeHeapVector<RawPtrWillBeMember<TreeScope>, 32> parentTreeScopes;
EventTarget* relatedNode = 0;
for (TreeScope* current = &scope; current; current = current->olderShadowRootOrParentTreeScope()) {
parentTreeScopes.append(current);
RelatedTargetMap::const_iterator iter = relatedTargetMap.find(current);
if (iter != relatedTargetMap.end() && iter->value) {
relatedNode = iter->value;
break;
}
}
ASSERT(relatedNode);
for (WillBeHeapVector<RawPtrWillBeMember<TreeScope>, 32>::iterator iter = parentTreeScopes.begin(); iter < parentTreeScopes.end(); ++iter)
relatedTargetMap.add(*iter, relatedNode);
return relatedNode;
}
void TreeScope::setParentTreeScope(TreeScope& newParentScope)
{
// A document node cannot be re-parented.
ASSERT(!m_rootNode.isDocumentNode());
m_parentTreeScope = &newParentScope;
setDocumentScope(newParentScope.documentScope());
}
void ElementRuleCollector::collectMatchingRules(const MatchRequest& matchRequest, StyleResolver::RuleRange& ruleRange)
{
ASSERT(matchRequest.ruleSet);
ASSERT(m_state.element());
const StyleResolver::State& state = m_state;
Element* element = state.element();
const StyledElement* styledElement = state.styledElement();
const AtomicString& pseudoId = element->shadowPseudoId();
if (!pseudoId.isEmpty()) {
ASSERT(styledElement);
collectMatchingRulesForList(matchRequest.ruleSet->shadowPseudoElementRules(pseudoId.impl()), matchRequest, ruleRange);
}
#if ENABLE(VIDEO_TRACK)
if (element->isWebVTTElement())
collectMatchingRulesForList(matchRequest.ruleSet->cuePseudoRules(), matchRequest, ruleRange);
#endif
// Check whether other types of rules are applicable in the current tree scope. Criteria for this:
// a) it's a UA rule
// b) the tree scope allows author rules
// c) the rules comes from a scoped style sheet within the same tree scope
TreeScope* treeScope = element->treeScope();
if (!MatchingUARulesScope::isMatchingUARules()
&& !treeScope->applyAuthorStyles()
&& (!matchRequest.scope || matchRequest.scope->treeScope() != treeScope)
&& m_behaviorAtBoundary == SelectorChecker::DoesNotCrossBoundary)
return;
// We need to collect the rules for id, class, tag, and everything else into a buffer and
// then sort the buffer.
if (element->hasID())
collectMatchingRulesForList(matchRequest.ruleSet->idRules(element->idForStyleResolution().impl()), matchRequest, ruleRange);
if (styledElement && styledElement->hasClass()) {
for (size_t i = 0; i < styledElement->classNames().size(); ++i)
collectMatchingRulesForList(matchRequest.ruleSet->classRules(styledElement->classNames()[i].impl()), matchRequest, ruleRange);
}
if (element->isLink())
collectMatchingRulesForList(matchRequest.ruleSet->linkPseudoClassRules(), matchRequest, ruleRange);
if (SelectorChecker::matchesFocusPseudoClass(element))
collectMatchingRulesForList(matchRequest.ruleSet->focusPseudoClassRules(), matchRequest, ruleRange);
collectMatchingRulesForList(matchRequest.ruleSet->tagRules(element->localName().impl()), matchRequest, ruleRange);
collectMatchingRulesForList(matchRequest.ruleSet->universalRules(), matchRequest, ruleRange);
}
Element* TreeScope::focusedElement()
{
Document& document = m_rootNode.document();
Element* element = document.focusedElement();
if (!element && document.page())
element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
if (!element)
return nullptr;
TreeScope* treeScope = &element->treeScope();
while (treeScope != this && treeScope != &document) {
element = downcast<ShadowRoot>(treeScope->rootNode()).host();
treeScope = &element->treeScope();
}
if (this != treeScope)
return nullptr;
return element;
}
Element* TreeScope::focusedElement()
{
Document* document = rootNode()->document();
Element* element = document->focusedElement();
if (!element && document->page())
element = focusedFrameOwnerElement(document->page()->focusController().focusedFrame(), document->frame());
if (!element)
return 0;
TreeScope* treeScope = element->treeScope();
while (treeScope != this && treeScope != document) {
element = toShadowRoot(treeScope->rootNode())->hostElement();
treeScope = element->treeScope();
}
if (this != treeScope)
return 0;
return element;
}
RelatedNodeRetargeter(Node& relatedNode, TreeScope& targetTreeScope)
: m_relatedNode(relatedNode)
, m_retargetedRelatedNode(&relatedNode)
{
TreeScope* currentTreeScope = &m_relatedNode.treeScope();
if (LIKELY(currentTreeScope == &targetTreeScope))
return;
if (¤tTreeScope->documentScope() != &targetTreeScope.documentScope()) {
m_hasDifferentTreeRoot = true;
m_retargetedRelatedNode = nullptr;
return;
}
if (relatedNode.inDocument() != targetTreeScope.rootNode().inDocument()) {
m_hasDifferentTreeRoot = true;
while (m_retargetedRelatedNode->isInShadowTree())
m_retargetedRelatedNode = downcast<ShadowRoot>(m_retargetedRelatedNode->treeScope().rootNode()).host();
return;
}
collectTreeScopes();
// FIXME: We should collect this while constructing the event path.
Vector<TreeScope*, 8> targetTreeScopeAncestors;
for (TreeScope* currentTreeScope = &targetTreeScope; currentTreeScope; currentTreeScope = currentTreeScope->parentTreeScope())
targetTreeScopeAncestors.append(currentTreeScope);
ASSERT_WITH_SECURITY_IMPLICATION(!targetTreeScopeAncestors.isEmpty());
unsigned i = m_ancestorTreeScopes.size();
unsigned j = targetTreeScopeAncestors.size();
ASSERT_WITH_SECURITY_IMPLICATION(m_ancestorTreeScopes.last() == targetTreeScopeAncestors.last());
while (m_ancestorTreeScopes[i - 1] == targetTreeScopeAncestors[j - 1]) {
i--;
j--;
if (!i || !j)
break;
}
m_lowestCommonAncestorIndex = i;
m_retargetedRelatedNode = nodeInLowestCommonAncestor();
}
AtomicString SVGURIReference::fragmentIdentifierFromIRIString(const String& url, const TreeScope& treeScope)
{
size_t start = url.find('#');
if (start == kNotFound)
return emptyAtom;
const Document& document = treeScope.document();
KURL base = start ? KURL(document.baseURI(), url.substring(0, start)) : document.baseURI();
if (equalIgnoringFragmentIdentifier(base, document.url()))
return AtomicString(url.substring(start + 1));
return emptyAtom;
}
void StyleEngine::updateActiveStyleSheets(StyleResolverUpdateMode updateMode)
{
ASSERT(isMaster());
ASSERT(!document().inStyleRecalc());
if (!document().isActive())
return;
if (shouldUpdateDocumentStyleSheetCollection(updateMode))
documentStyleSheetCollection()->updateActiveStyleSheets(this, updateMode);
if (shouldUpdateShadowTreeStyleSheetCollection(updateMode)) {
TreeScopeSet treeScopes = updateMode == FullStyleUpdate ? m_activeTreeScopes : m_dirtyTreeScopes;
HashSet<TreeScope*> treeScopesRemoved;
for (TreeScopeSet::iterator it = treeScopes.begin(); it != treeScopes.end(); ++it) {
TreeScope* treeScope = *it;
ASSERT(treeScope != m_document);
ShadowTreeStyleSheetCollection* collection = static_cast<ShadowTreeStyleSheetCollection*>(styleSheetCollectionFor(*treeScope));
ASSERT(collection);
collection->updateActiveStyleSheets(this, updateMode);
if (!collection->hasStyleSheetCandidateNodes()) {
treeScopesRemoved.add(treeScope);
// When removing TreeScope from ActiveTreeScopes,
// its resolver should be destroyed by invoking resetAuthorStyle.
ASSERT(!treeScope->scopedStyleResolver());
}
}
m_activeTreeScopes.removeAll(treeScopesRemoved);
}
InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
m_usesRemUnits = documentStyleSheetCollection()->usesRemUnits();
m_dirtyTreeScopes.clear();
m_documentScopeDirty = false;
}
Node* moveToParentOrShadowHost(Node& newTarget)
{
TreeScope& newTreeScope = newTarget.treeScope();
if (&newTreeScope == m_currentTreeScope)
return m_relatedNodeInCurrentTreeScope;
if (m_currentTreeScope) {
ASSERT(is<ShadowRoot>(m_currentTreeScope->rootNode()));
ASSERT(&newTarget == downcast<ShadowRoot>(m_currentTreeScope->rootNode()).host());
ASSERT(m_currentTreeScope->parentTreeScope() == &newTreeScope);
}
if (&newTreeScope == &m_relatedNodeTreeScope)
m_relatedNodeInCurrentTreeScope = &m_relatedNode;
else if (m_relatedNodeInCurrentTreeScope) {
ASSERT(m_currentTreeScope);
m_relatedNodeInCurrentTreeScope = &newTarget;
} else {
if (!m_currentTreeScope) {
TreeScope* newTreeScopeAncestor = &newTreeScope;
do {
m_relatedNodeInCurrentTreeScope = findHostOfTreeScopeInTargetTreeScope(m_relatedNodeTreeScope, *newTreeScopeAncestor);
newTreeScopeAncestor = newTreeScopeAncestor->parentTreeScope();
if (newTreeScopeAncestor == &m_relatedNodeTreeScope) {
m_relatedNodeInCurrentTreeScope = &m_relatedNode;
break;
}
} while (newTreeScopeAncestor && !m_relatedNodeInCurrentTreeScope);
}
ASSERT(m_relatedNodeInCurrentTreeScope || findHostOfTreeScopeInTargetTreeScope(newTreeScope, m_relatedNodeTreeScope)
|| &newTreeScope.documentScope() != &m_relatedNodeTreeScope.documentScope());
}
m_currentTreeScope = &newTreeScope;
return m_relatedNodeInCurrentTreeScope;
}
void ScopedStyleResolver::keyframesRulesAdded(const TreeScope& treeScope) {
// Called when @keyframes rules are about to be added/removed from a
// TreeScope. @keyframes rules may apply to animations on elements in the
// same TreeScope as the stylesheet, or the host element in the parent
// TreeScope if the TreeScope is a shadow tree.
ScopedStyleResolver* resolver = treeScope.scopedStyleResolver();
ScopedStyleResolver* parentResolver =
treeScope.parentTreeScope()
? treeScope.parentTreeScope()->scopedStyleResolver()
: nullptr;
bool hadUnresolvedKeyframes = false;
if (resolver && resolver->m_hasUnresolvedKeyframesRule) {
resolver->m_hasUnresolvedKeyframesRule = false;
hadUnresolvedKeyframes = true;
}
if (parentResolver && parentResolver->m_hasUnresolvedKeyframesRule) {
parentResolver->m_hasUnresolvedKeyframesRule = false;
hadUnresolvedKeyframes = true;
}
if (hadUnresolvedKeyframes) {
// If an animation ended up not being started because no @keyframes
// rules were found for the animation-name, we need to recalculate style
// for the elements in the scope, including its shadow host if
// applicable.
invalidationRootForTreeScope(treeScope).setNeedsStyleRecalc(
SubtreeStyleChange, StyleChangeReasonForTracing::create(
StyleChangeReason::StyleSheetChange));
return;
}
// If we have animations running, added/removed @keyframes may affect these.
treeScope.document().timeline().invalidateKeyframeEffects(treeScope);
}
static inline KURL urlFromIRIStringWithFragmentIdentifier(const String& url, const TreeScope& treeScope, AtomicString& fragmentIdentifier)
{
size_t startOfFragmentIdentifier = url.find('#');
if (startOfFragmentIdentifier == kNotFound)
return KURL();
const Document& document = treeScope.document();
// Exclude the '#' character when determining the fragmentIdentifier.
fragmentIdentifier = AtomicString(url.substring(startOfFragmentIdentifier + 1));
if (startOfFragmentIdentifier) {
KURL base(document.baseURI(), url.substring(0, startOfFragmentIdentifier));
return KURL(base, url.substring(startOfFragmentIdentifier));
}
return KURL(document.baseURI(), url.substring(startOfFragmentIdentifier));
}
Node* HTMLCollection::namedItem(const AtomicString& name) const
{
// http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/nameditem.asp
// This method first searches for an object with a matching id
// attribute. If a match is not found, the method then searches for an
// object with a matching name attribute, but only on those elements
// that are allowed a name attribute.
ContainerNode* root = rootContainerNode();
if (name.isEmpty() || !root)
return 0;
if (!overridesItemAfter() && root->isInTreeScope()) {
TreeScope* treeScope = root->treeScope();
Element* candidate = 0;
if (treeScope->hasElementWithId(name.impl())) {
if (!treeScope->containsMultipleElementsWithId(name))
candidate = treeScope->getElementById(name);
} else if (treeScope->hasElementWithName(name.impl())) {
if (!treeScope->containsMultipleElementsWithName(name)) {
candidate = treeScope->getElementByName(name);
if (candidate && type() == DocAll && (!candidate->isHTMLElement() || !nameShouldBeVisibleInDocumentAll(toHTMLElement(candidate))))
candidate = 0;
}
} else
return 0;
if (candidate
&& isMatchingElement(this, candidate)
&& (shouldOnlyIncludeDirectChildren() ? candidate->parentNode() == root : candidate->isDescendantOf(root)))
return candidate;
}
// The pathological case. We need to walk the entire subtree.
updateNameCache();
if (Vector<Element*>* idResults = idCache(name)) {
if (idResults->size())
return idResults->at(0);
}
if (Vector<Element*>* nameResults = nameCache(name)) {
if (nameResults->size())
return nameResults->at(0);
}
return 0;
}
PassRefPtrWillBeRawPtr<ShadowRoot> createShadowRootForElementWithIDAndSetInnerHTML(TreeScope& scope, const char* hostElementID, const char* shadowRootContent)
{
RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = scope.getElementById(AtomicString::fromUTF8(hostElementID))->createShadowRoot(ASSERT_NO_EXCEPTION);
shadowRoot->setInnerHTML(String::fromUTF8(shadowRootContent), ASSERT_NO_EXCEPTION);
return shadowRoot.release();
}
DocumentStyleSheetCollection::DocumentStyleSheetCollection(TreeScope& treeScope)
: TreeScopeStyleSheetCollection(treeScope)
{
ASSERT(treeScope.rootNode() == treeScope.rootNode().document());
}
PassRefPtr<FilterEffect> ReferenceFilterBuilder::build(Filter* parentFilter, RenderObject* renderer, FilterEffect* previousEffect, const ReferenceFilterOperation* filterOperation)
{
if (!renderer)
return nullptr;
TreeScope* treeScope = &renderer->node()->treeScope();
if (DocumentResourceReference* documentResourceRef = documentResourceReference(filterOperation)) {
DocumentResource* cachedSVGDocument = documentResourceRef->document();
// If we have an SVG document, this is an external reference. Otherwise
// we look up the referenced node in the current document.
if (cachedSVGDocument)
treeScope = cachedSVGDocument->document();
}
if (!treeScope)
return nullptr;
Element* filter = treeScope->getElementById(filterOperation->fragment());
if (!filter) {
// Although we did not find the referenced filter, it might exist later
// in the document.
treeScope->document().accessSVGExtensions().addPendingResource(filterOperation->fragment(), toElement(renderer->node()));
return nullptr;
}
if (!isSVGFilterElement(*filter))
return nullptr;
SVGFilterElement& filterElement = toSVGFilterElement(*filter);
// FIXME: Figure out what to do with SourceAlpha. Right now, we're
// using the alpha of the original input layer, which is obviously
// wrong. We should probably be extracting the alpha from the
// previousEffect, but this requires some more processing.
// This may need a spec clarification.
RefPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(previousEffect, SourceAlpha::create(parentFilter));
ColorSpace filterColorSpace = ColorSpaceDeviceRGB;
bool useFilterColorSpace = getSVGElementColorSpace(&filterElement, filterColorSpace);
for (SVGElement* element = Traversal<SVGElement>::firstChild(filterElement); element; element = Traversal<SVGElement>::nextSibling(*element)) {
if (!element->isFilterEffect())
continue;
SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
RefPtr<FilterEffect> effect = effectElement->build(builder.get(), parentFilter);
if (!effect)
continue;
effectElement->setStandardAttributes(effect.get());
effect->setEffectBoundaries(SVGLengthContext::resolveRectangle<SVGFilterPrimitiveStandardAttributes>(effectElement, filterElement.primitiveUnits()->currentValue()->enumValue(), parentFilter->sourceImageRect()));
ColorSpace colorSpace = filterColorSpace;
if (useFilterColorSpace || getSVGElementColorSpace(effectElement, colorSpace))
effect->setOperatingColorSpace(colorSpace);
builder->add(AtomicString(effectElement->result()->currentValue()->value()), effect);
}
return builder->lastEffect();
}