671 lines
22 KiB
C++
671 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/SVGUseElement.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ScopeExit.h"
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#include "mozilla/StaticPrefs_svg.h"
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#include "mozilla/SVGObserverUtils.h"
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#include "mozilla/SVGUseFrame.h"
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#include "mozilla/URLExtraData.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/ReferrerInfo.h"
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#include "mozilla/dom/ShadowIncludingTreeIterator.h"
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#include "mozilla/dom/SVGGraphicsElement.h"
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#include "mozilla/dom/SVGLengthBinding.h"
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#include "mozilla/dom/SVGSVGElement.h"
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#include "mozilla/dom/SVGSwitchElement.h"
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#include "mozilla/dom/SVGSymbolElement.h"
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#include "mozilla/dom/SVGUseElementBinding.h"
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#include "nsGkAtoms.h"
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#include "nsContentUtils.h"
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#include "nsIReferrerInfo.h"
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#include "nsIURI.h"
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#include "SVGGeometryProperty.h"
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NS_IMPL_NS_NEW_SVG_ELEMENT(Use)
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namespace mozilla::dom {
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JSObject* SVGUseElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return SVGUseElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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////////////////////////////////////////////////////////////////////////
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// implementation
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SVGElement::LengthInfo SVGUseElement::sLengthInfo[4] = {
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{nsGkAtoms::x, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::X},
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{nsGkAtoms::y, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::Y},
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{nsGkAtoms::width, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::X},
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{nsGkAtoms::height, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::Y},
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};
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SVGElement::StringInfo SVGUseElement::sStringInfo[2] = {
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{nsGkAtoms::href, kNameSpaceID_None, true},
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{nsGkAtoms::href, kNameSpaceID_XLink, true}};
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//----------------------------------------------------------------------
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// nsISupports methods
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NS_IMPL_CYCLE_COLLECTION_CLASS(SVGUseElement)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SVGUseElement,
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SVGUseElementBase)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mOriginal)
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tmp->UnlinkSource();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGUseElement,
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SVGUseElementBase)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOriginal)
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tmp->mReferencedElementTracker.Traverse(&cb);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGUseElement, SVGUseElementBase,
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nsIMutationObserver)
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//----------------------------------------------------------------------
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// Implementation
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SVGUseElement::SVGUseElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: SVGUseElementBase(std::move(aNodeInfo)), mReferencedElementTracker(this) {
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SetEnabledCallbacks(kCharacterDataChanged | kAttributeChanged |
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kContentAppended | kContentInserted |
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kContentWillBeRemoved | kNodeWillBeDestroyed);
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}
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SVGUseElement::~SVGUseElement() {
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UnlinkSource();
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MOZ_DIAGNOSTIC_ASSERT(!OwnerDoc()->SVGUseElementNeedsShadowTreeUpdate(*this),
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"Dying without unbinding?");
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}
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namespace SVGT = SVGGeometryProperty::Tags;
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//----------------------------------------------------------------------
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// nsINode methods
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void SVGUseElement::ProcessAttributeChange(int32_t aNamespaceID,
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nsAtom* aAttribute) {
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if (OwnerDoc()->CloningForSVGUse()) {
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return;
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}
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if (aNamespaceID == kNameSpaceID_None) {
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if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height) {
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const bool hadValidDimensions = HasValidDimensions();
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const bool isUsed = OurWidthAndHeightAreUsed();
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if (isUsed) {
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SyncWidthOrHeight(aAttribute);
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}
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if (auto* frame = GetFrame()) {
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frame->DimensionAttributeChanged(hadValidDimensions, isUsed);
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}
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}
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}
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if ((aNamespaceID == kNameSpaceID_XLink ||
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aNamespaceID == kNameSpaceID_None) &&
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aAttribute == nsGkAtoms::href) {
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// We're changing our nature, clear out the clone information.
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if (auto* frame = GetFrame()) {
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frame->HrefChanged();
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}
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UnlinkSource();
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TriggerReclone();
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}
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}
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void SVGUseElement::DidAnimateAttribute(int32_t aNameSpaceID,
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nsAtom* aAttribute) {
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ProcessAttributeChange(aNameSpaceID, aAttribute);
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}
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void SVGUseElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify) {
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ProcessAttributeChange(aNamespaceID, aAttribute);
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return SVGUseElementBase::AfterSetAttr(aNamespaceID, aAttribute, aValue,
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aOldValue, aSubjectPrincipal, aNotify);
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}
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nsresult SVGUseElement::Clone(dom::NodeInfo* aNodeInfo,
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nsINode** aResult) const {
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*aResult = nullptr;
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SVGUseElement* it =
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new (aNodeInfo->NodeInfoManager()) SVGUseElement(do_AddRef(aNodeInfo));
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nsCOMPtr<nsINode> kungFuDeathGrip(it);
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nsresult rv1 = it->Init();
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nsresult rv2 = const_cast<SVGUseElement*>(this)->CopyInnerTo(it);
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if (aNodeInfo->GetDocument()->CloningForSVGUse()) {
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// SVGUseElement specific portion - record who we cloned from
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it->mOriginal = const_cast<SVGUseElement*>(this);
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}
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if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2)) {
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kungFuDeathGrip.swap(*aResult);
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}
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return NS_FAILED(rv1) ? rv1 : rv2;
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}
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nsresult SVGUseElement::BindToTree(BindContext& aContext, nsINode& aParent) {
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nsresult rv = SVGUseElementBase::BindToTree(aContext, aParent);
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NS_ENSURE_SUCCESS(rv, rv);
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TriggerReclone();
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return NS_OK;
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}
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void SVGUseElement::UnbindFromTree(UnbindContext& aContext) {
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SVGUseElementBase::UnbindFromTree(aContext);
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OwnerDoc()->UnscheduleSVGUseElementShadowTreeUpdate(*this);
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}
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already_AddRefed<DOMSVGAnimatedString> SVGUseElement::Href() {
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return mStringAttributes[HREF].IsExplicitlySet()
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? mStringAttributes[HREF].ToDOMAnimatedString(this)
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: mStringAttributes[XLINK_HREF].ToDOMAnimatedString(this);
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}
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//----------------------------------------------------------------------
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::X() {
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return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Y() {
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return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Width() {
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return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Height() {
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return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
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}
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//----------------------------------------------------------------------
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// nsIMutationObserver methods
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void SVGUseElement::CharacterDataChanged(nsIContent* aContent,
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const CharacterDataChangeInfo&) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aContent)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::AttributeChanged(Element* aElement, int32_t aNamespaceID,
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nsAtom* aAttribute, int32_t aModType,
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const nsAttrValue* aOldValue) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aElement)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentAppended(nsIContent* aFirstNewContent) {
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// FIXME(emilio, bug 1442336): Why does this check the parent but
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// ContentInserted the child?
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aFirstNewContent->GetParent())) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentInserted(nsIContent* aChild) {
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// FIXME(emilio, bug 1442336): Why does this check the child but
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// ContentAppended the parent?
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aChild)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentWillBeRemoved(nsIContent* aChild,
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const BatchRemovalState*) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aChild)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::NodeWillBeDestroyed(nsINode* aNode) {
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nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
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UnlinkSource();
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}
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// Returns whether this node could ever be displayed.
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static bool NodeCouldBeRendered(const nsINode& aNode) {
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if (const auto* symbol = SVGSymbolElement::FromNode(aNode)) {
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return symbol->CouldBeRendered();
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}
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if (auto* svgSwitch =
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SVGSwitchElement::FromNodeOrNull(aNode.GetParentNode())) {
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if (&aNode != svgSwitch->GetActiveChild()) {
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return false;
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}
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} else if (const auto* svgGraphics = SVGGraphicsElement::FromNode(aNode)) {
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if (!svgGraphics->PassesConditionalProcessingTests()) {
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return false;
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}
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}
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return true;
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}
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// <svg:use> can be used (no pun intended) to trivially cause an explosion of
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// clones that could potentially DoS the browser. We have a configurable limit
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// to control this.
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static bool IsTooMuchRecursion(uint32_t aCount) {
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switch (StaticPrefs::svg_use_element_recursive_clone_limit_enabled()) {
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case 0:
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return false;
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case 1:
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break;
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default:
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if (!XRE_IsParentProcess()) {
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return false;
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}
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break;
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}
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return aCount >= StaticPrefs::svg_use_element_recursive_clone_limit();
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}
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// Circular loop detection, plus detection of whether this shadow tree is
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// rendered at all.
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auto SVGUseElement::ScanAncestors(const Element& aTarget) const -> ScanResult {
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uint32_t count = 0;
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return ScanAncestorsInternal(aTarget, count);
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}
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auto SVGUseElement::ScanAncestorsInternal(const Element& aTarget,
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uint32_t& aCount) const
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-> ScanResult {
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if (&aTarget == this) {
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return ScanResult::CyclicReference;
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}
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if (mOriginal) {
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if (IsTooMuchRecursion(++aCount)) {
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return ScanResult::TooDeep;
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}
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auto result = mOriginal->ScanAncestorsInternal(aTarget, aCount);
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switch (result) {
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case ScanResult::TooDeep:
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case ScanResult::CyclicReference:
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return result;
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case ScanResult::Ok:
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case ScanResult::Invisible:
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break;
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}
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}
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auto result = ScanResult::Ok;
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for (nsINode* parent = GetParentOrShadowHostNode(); parent;
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parent = parent->GetParentOrShadowHostNode()) {
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if (parent == &aTarget) {
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return ScanResult::CyclicReference;
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}
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if (auto* use = SVGUseElement::FromNode(*parent)) {
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if (IsTooMuchRecursion(++aCount)) {
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return ScanResult::TooDeep;
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}
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if (mOriginal && use->mOriginal == mOriginal) {
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return ScanResult::CyclicReference;
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}
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}
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// Do we have other similar cases we can optimize out easily?
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if (!NodeCouldBeRendered(*parent)) {
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// NOTE(emilio): We can't just return here. If we're cyclic, we need to
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// know.
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result = ScanResult::Invisible;
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}
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}
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return result;
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}
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//----------------------------------------------------------------------
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static bool IsForbiddenUseNode(const nsINode& aNode) {
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if (!aNode.IsElement()) {
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return false;
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}
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const auto* svg = SVGElement::FromNode(aNode);
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return !svg || !svg->IsSVGGraphicsElement();
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}
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static void CollectForbiddenNodes(Element& aRoot,
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nsTArray<RefPtr<nsINode>>& aNodes) {
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auto iter = dom::ShadowIncludingTreeIterator(aRoot);
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while (iter) {
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nsINode* node = *iter;
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if (IsForbiddenUseNode(*node)) {
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aNodes.AppendElement(node);
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iter.SkipChildren();
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continue;
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}
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++iter;
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}
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}
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// SVG1 restricted <use> trees to SVGGraphicsElements.
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// https://www.w3.org/TR/SVG11/struct.html#UseElement:
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//
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// Any ‘svg’, ‘symbol’, ‘g’, graphics element or other ‘use’ is potentially a
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// template object that can be re-used (i.e., "instanced") in the SVG
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// document via a ‘use’ element. The ‘use’ element references another element
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// and indicates that the graphical contents of that element is
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// included/drawn at that given point in the document.
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//
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// SVG2 doesn't have that same restriction.
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// https://www.w3.org/TR/SVG2/struct.html#UseShadowTree:
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//
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// Previous versions of SVG restricted the contents of the shadow tree to SVG
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// graphics elements. This specification allows any valid SVG document
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// subtree to be cloned. Cloning non-graphical content, however, will not
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// usually have any visible effect.
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//
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// But it's pretty ambiguous as to what the behavior should be for some
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// elements, because <script> is inert, but <iframe> is not, see:
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// https://github.com/w3c/svgwg/issues/876
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//
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// So, fairly confusing, all-in-all.
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static void RemoveForbiddenNodes(Element& aRoot, bool aIsCrossDocument) {
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switch (StaticPrefs::svg_use_element_graphics_element_restrictions()) {
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case 0:
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return;
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case 1:
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if (!aIsCrossDocument) {
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return;
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}
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break;
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default:
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break;
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}
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AutoTArray<RefPtr<nsINode>, 10> unsafeNodes;
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CollectForbiddenNodes(aRoot, unsafeNodes);
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for (auto& unsafeNode : unsafeNodes) {
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unsafeNode->Remove();
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}
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}
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void SVGUseElement::UpdateShadowTree() {
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MOZ_ASSERT(IsInComposedDoc());
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if (mReferencedElementTracker.get()) {
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mReferencedElementTracker.get()->RemoveMutationObserver(this);
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}
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LookupHref();
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RefPtr<ShadowRoot> shadow = GetShadowRoot();
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if (!shadow) {
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shadow = AttachShadowWithoutNameChecks(ShadowRootMode::Closed);
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}
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MOZ_ASSERT(shadow);
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auto* targetElement =
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SVGGraphicsElement::FromNodeOrNull(mReferencedElementTracker.get());
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RefPtr<Element> newElement;
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auto UpdateShadowTree = mozilla::MakeScopeExit([&]() {
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if (nsIContent* firstChild = shadow->GetFirstChild()) {
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MOZ_ASSERT(!firstChild->GetNextSibling());
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shadow->RemoveChildNode(firstChild, /* aNotify = */ true);
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}
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if (newElement) {
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shadow->AppendChildTo(newElement, /* aNotify = */ true, IgnoreErrors());
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}
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});
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// make sure target is valid type for <use>
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if (!targetElement) {
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return;
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}
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if (ScanAncestors(*targetElement) != ScanResult::Ok) {
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return;
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}
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nsCOMPtr<nsIURI> baseURI = targetElement->GetBaseURI();
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if (!baseURI) {
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return;
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}
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{
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const bool isCrossDocument = targetElement->OwnerDoc() != OwnerDoc();
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nsNodeInfoManager* nodeInfoManager =
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isCrossDocument ? OwnerDoc()->NodeInfoManager() : nullptr;
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nsCOMPtr<nsINode> newNode =
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targetElement->Clone(true, nodeInfoManager, IgnoreErrors());
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if (!newNode) {
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return;
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}
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MOZ_ASSERT(newNode->IsElement());
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newElement = newNode.forget().downcast<Element>();
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RemoveForbiddenNodes(*newElement, isCrossDocument);
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}
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if (newElement->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
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auto* newSVGElement = static_cast<SVGElement*>(newElement.get());
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if (mLengthAttributes[ATTR_WIDTH].IsExplicitlySet())
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newSVGElement->SetLength(nsGkAtoms::width, mLengthAttributes[ATTR_WIDTH]);
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if (mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet())
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newSVGElement->SetLength(nsGkAtoms::height,
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mLengthAttributes[ATTR_HEIGHT]);
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}
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// Bug 1415044 the specs do not say which referrer information we should use.
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// This may change if there's any spec comes out.
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auto referrerInfo = MakeRefPtr<ReferrerInfo>(*this);
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mContentURLData = new URLExtraData(baseURI.forget(), referrerInfo.forget(),
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do_AddRef(NodePrincipal()));
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targetElement->AddMutationObserver(this);
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}
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Document* SVGUseElement::GetSourceDocument() const {
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nsIContent* targetElement = mReferencedElementTracker.get();
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return targetElement ? targetElement->OwnerDoc() : nullptr;
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}
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nsIURI* SVGUseElement::GetSourceDocURI() const {
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if (auto* doc = GetSourceDocument()) {
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return doc->GetDocumentURI();
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}
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return nullptr;
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}
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const Encoding* SVGUseElement::GetSourceDocCharacterSet() const {
|
||
if (auto* doc = GetSourceDocument()) {
|
||
return doc->GetDocumentCharacterSet();
|
||
}
|
||
return nullptr;
|
||
}
|
||
|
||
static nsINode* GetClonedChild(const SVGUseElement& aUseElement) {
|
||
const ShadowRoot* shadow = aUseElement.GetShadowRoot();
|
||
return shadow ? shadow->GetFirstChild() : nullptr;
|
||
}
|
||
|
||
bool SVGUseElement::OurWidthAndHeightAreUsed() const {
|
||
nsINode* clonedChild = GetClonedChild(*this);
|
||
return clonedChild &&
|
||
clonedChild->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol);
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// implementation helpers
|
||
|
||
void SVGUseElement::SyncWidthOrHeight(nsAtom* aName) {
|
||
NS_ASSERTION(aName == nsGkAtoms::width || aName == nsGkAtoms::height,
|
||
"The clue is in the function name");
|
||
NS_ASSERTION(OurWidthAndHeightAreUsed(), "Don't call this");
|
||
|
||
if (!OurWidthAndHeightAreUsed()) {
|
||
return;
|
||
}
|
||
|
||
auto* target = SVGElement::FromNode(GetClonedChild(*this));
|
||
uint32_t index =
|
||
sLengthInfo[ATTR_WIDTH].mName == aName ? ATTR_WIDTH : ATTR_HEIGHT;
|
||
|
||
if (mLengthAttributes[index].IsExplicitlySet()) {
|
||
target->SetLength(aName, mLengthAttributes[index]);
|
||
return;
|
||
}
|
||
if (target->IsSVGElement(nsGkAtoms::svg)) {
|
||
// Our width/height attribute is now no longer explicitly set, so we
|
||
// need to revert the clone's width/height to the width/height of the
|
||
// content that's being cloned.
|
||
TriggerReclone();
|
||
return;
|
||
}
|
||
// Our width/height attribute is now no longer explicitly set, so we
|
||
// need to set the value to 100%
|
||
SVGAnimatedLength length;
|
||
length.Init(SVGContentUtils::XY, 0xff, 100,
|
||
SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE);
|
||
target->SetLength(aName, length);
|
||
}
|
||
|
||
void SVGUseElement::LookupHref() {
|
||
nsAutoString href;
|
||
if (mStringAttributes[HREF].IsExplicitlySet()) {
|
||
mStringAttributes[HREF].GetAnimValue(href, this);
|
||
} else {
|
||
mStringAttributes[XLINK_HREF].GetAnimValue(href, this);
|
||
}
|
||
|
||
if (href.IsEmpty()) {
|
||
return;
|
||
}
|
||
|
||
Element* treeToWatch = mOriginal ? mOriginal.get() : this;
|
||
if (nsContentUtils::IsLocalRefURL(href)) {
|
||
mReferencedElementTracker.ResetToLocalFragmentID(*treeToWatch, href);
|
||
return;
|
||
}
|
||
|
||
nsCOMPtr<nsIURI> baseURI = treeToWatch->GetBaseURI();
|
||
nsCOMPtr<nsIURI> targetURI;
|
||
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
|
||
GetComposedDoc(), baseURI);
|
||
if (!targetURI) {
|
||
return;
|
||
}
|
||
|
||
// Don't allow <use href="data:...">. Using "#ref" inside a data: document is
|
||
// handled above.
|
||
if (targetURI->SchemeIs("data") &&
|
||
!StaticPrefs::svg_use_element_data_url_href_allowed()) {
|
||
return;
|
||
}
|
||
|
||
nsIReferrerInfo* referrer =
|
||
OwnerDoc()->ReferrerInfoForInternalCSSAndSVGResources();
|
||
mReferencedElementTracker.ResetToURIWithFragmentID(*treeToWatch, targetURI,
|
||
referrer);
|
||
}
|
||
|
||
void SVGUseElement::TriggerReclone() {
|
||
if (Document* doc = GetComposedDoc()) {
|
||
doc->ScheduleSVGUseElementShadowTreeUpdate(*this);
|
||
}
|
||
}
|
||
|
||
void SVGUseElement::UnlinkSource() {
|
||
if (mReferencedElementTracker.get()) {
|
||
mReferencedElementTracker.get()->RemoveMutationObserver(this);
|
||
}
|
||
mReferencedElementTracker.Unlink();
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// SVGElement methods
|
||
|
||
/* virtual */
|
||
gfxMatrix SVGUseElement::ChildToUserSpaceTransform() const {
|
||
float x, y;
|
||
if (!SVGGeometryProperty::ResolveAll<SVGT::X, SVGT::Y>(this, &x, &y)) {
|
||
const_cast<SVGUseElement*>(this)->GetAnimatedLengthValues(&x, &y, nullptr);
|
||
}
|
||
return gfxMatrix::Translation(x, y);
|
||
}
|
||
|
||
/* virtual */
|
||
bool SVGUseElement::HasValidDimensions() const {
|
||
if (!OurWidthAndHeightAreUsed()) {
|
||
return true;
|
||
}
|
||
|
||
return (!mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() ||
|
||
mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0) &&
|
||
(!mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() ||
|
||
mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0);
|
||
}
|
||
|
||
SVGElement::LengthAttributesInfo SVGUseElement::GetLengthInfo() {
|
||
return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
|
||
std::size(sLengthInfo));
|
||
}
|
||
|
||
SVGElement::StringAttributesInfo SVGUseElement::GetStringInfo() {
|
||
return StringAttributesInfo(mStringAttributes, sStringInfo,
|
||
std::size(sStringInfo));
|
||
}
|
||
|
||
SVGUseFrame* SVGUseElement::GetFrame() const {
|
||
nsIFrame* frame = GetPrimaryFrame();
|
||
// We might be a plain SVGContainerFrame if we didn't pass the conditional
|
||
// processing checks.
|
||
if (!frame || !frame->IsSVGUseFrame()) {
|
||
MOZ_ASSERT_IF(frame, frame->Type() == LayoutFrameType::None);
|
||
return nullptr;
|
||
}
|
||
return static_cast<SVGUseFrame*>(frame);
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// nsIContent methods
|
||
|
||
NS_IMETHODIMP_(bool)
|
||
SVGUseElement::IsAttributeMapped(const nsAtom* name) const {
|
||
return name == nsGkAtoms::x || name == nsGkAtoms::y ||
|
||
SVGUseElementBase::IsAttributeMapped(name);
|
||
}
|
||
|
||
nsCSSPropertyID SVGUseElement::GetCSSPropertyIdForAttrEnum(uint8_t aAttrEnum) {
|
||
switch (aAttrEnum) {
|
||
case ATTR_X:
|
||
return eCSSProperty_x;
|
||
case ATTR_Y:
|
||
return eCSSProperty_y;
|
||
default:
|
||
// Currently we don't map width or height to style
|
||
return eCSSProperty_UNKNOWN;
|
||
}
|
||
}
|
||
|
||
} // namespace mozilla::dom
|