зеркало из https://github.com/mozilla/gecko-dev.git
1303 строки
44 KiB
C++
1303 строки
44 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/HTMLImageElement.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/HTMLImageElementBinding.h"
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#include "mozilla/dom/BindContext.h"
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#include "mozilla/dom/NameSpaceConstants.h"
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#include "nsGenericHTMLElement.h"
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#include "nsGkAtoms.h"
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#include "nsStyleConsts.h"
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#include "nsPresContext.h"
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#include "nsMappedAttributes.h"
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#include "nsSize.h"
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#include "mozilla/dom/Document.h"
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#include "nsImageFrame.h"
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#include "nsIScriptContext.h"
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#include "nsContentUtils.h"
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#include "nsContainerFrame.h"
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#include "nsNodeInfoManager.h"
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#include "mozilla/MouseEvents.h"
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#include "nsContentPolicyUtils.h"
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#include "nsFocusManager.h"
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#include "mozilla/dom/DOMIntersectionObserver.h"
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#include "mozilla/dom/HTMLFormElement.h"
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#include "mozilla/dom/MutationEventBinding.h"
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#include "mozilla/dom/UserActivation.h"
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#include "nsAttrValueOrString.h"
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#include "imgLoader.h"
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#include "Image.h"
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// Responsive images!
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#include "mozilla/dom/HTMLSourceElement.h"
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#include "mozilla/dom/ResponsiveImageSelector.h"
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#include "imgINotificationObserver.h"
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#include "imgRequestProxy.h"
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#include "mozilla/CycleCollectedJSContext.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/MappedDeclarations.h"
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#include "nsLayoutUtils.h"
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using namespace mozilla::net;
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NS_IMPL_NS_NEW_HTML_ELEMENT(Image)
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#ifdef DEBUG
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// Is aSubject a previous sibling of aNode.
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static bool IsPreviousSibling(nsINode* aSubject, nsINode* aNode) {
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if (aSubject == aNode) {
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return false;
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}
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nsINode* parent = aSubject->GetParentNode();
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if (parent && parent == aNode->GetParentNode()) {
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return parent->ComputeIndexOf(aSubject) < parent->ComputeIndexOf(aNode);
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}
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return false;
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}
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#endif
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namespace mozilla {
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namespace dom {
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// Calls LoadSelectedImage on host element unless it has been superseded or
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// canceled -- this is the synchronous section of "update the image data".
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// https://html.spec.whatwg.org/multipage/embedded-content.html#update-the-image-data
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class ImageLoadTask final : public MicroTaskRunnable {
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public:
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ImageLoadTask(HTMLImageElement* aElement, bool aAlwaysLoad,
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bool aUseUrgentStartForChannel)
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: MicroTaskRunnable(),
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mElement(aElement),
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mAlwaysLoad(aAlwaysLoad),
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mUseUrgentStartForChannel(aUseUrgentStartForChannel) {
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mDocument = aElement->OwnerDoc();
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mDocument->BlockOnload();
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}
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void Run(AutoSlowOperation& aAso) override {
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if (mElement->mPendingImageLoadTask == this) {
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mElement->mPendingImageLoadTask = nullptr;
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mElement->mUseUrgentStartForChannel = mUseUrgentStartForChannel;
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// Defer loading this image if loading="lazy" was set after this microtask
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// was queued.
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// NOTE: Using ShouldLoadImage() will violate the HTML standard spec
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// because ShouldLoadImage() checks the document active state which should
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// have done just once before this queue is created as per the spec, so
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// we just check the lazy loading state here.
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if (!mElement->IsLazyLoading()) {
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mElement->LoadSelectedImage(true, true, mAlwaysLoad);
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}
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}
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mDocument->UnblockOnload(false);
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}
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bool Suppressed() override {
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nsIGlobalObject* global = mElement->GetOwnerGlobal();
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return global && global->IsInSyncOperation();
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}
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bool AlwaysLoad() { return mAlwaysLoad; }
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private:
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~ImageLoadTask() = default;
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RefPtr<HTMLImageElement> mElement;
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nsCOMPtr<Document> mDocument;
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bool mAlwaysLoad;
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// True if we want to set nsIClassOfService::UrgentStart to the channel to
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// get the response ASAP for better user responsiveness.
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bool mUseUrgentStartForChannel;
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};
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HTMLImageElement::HTMLImageElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: nsGenericHTMLElement(std::move(aNodeInfo)),
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mForm(nullptr),
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mInDocResponsiveContent(false),
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mCurrentDensity(1.0) {
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// We start out broken
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AddStatesSilently(NS_EVENT_STATE_BROKEN);
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}
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HTMLImageElement::~HTMLImageElement() { DestroyImageLoadingContent(); }
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NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLImageElement, nsGenericHTMLElement,
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mResponsiveSelector)
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NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLImageElement,
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nsGenericHTMLElement,
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nsIImageLoadingContent,
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imgINotificationObserver)
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NS_IMPL_ELEMENT_CLONE(HTMLImageElement)
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bool HTMLImageElement::IsInteractiveHTMLContent() const {
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return HasAttr(kNameSpaceID_None, nsGkAtoms::usemap) ||
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nsGenericHTMLElement::IsInteractiveHTMLContent();
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}
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void HTMLImageElement::AsyncEventRunning(AsyncEventDispatcher* aEvent) {
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nsImageLoadingContent::AsyncEventRunning(aEvent);
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}
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void HTMLImageElement::GetCurrentSrc(nsAString& aValue) {
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nsCOMPtr<nsIURI> currentURI;
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GetCurrentURI(getter_AddRefs(currentURI));
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if (currentURI) {
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nsAutoCString spec;
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currentURI->GetSpec(spec);
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CopyUTF8toUTF16(spec, aValue);
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} else {
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SetDOMStringToNull(aValue);
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}
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}
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bool HTMLImageElement::Draggable() const {
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// images may be dragged unless the draggable attribute is false
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return !AttrValueIs(kNameSpaceID_None, nsGkAtoms::draggable,
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nsGkAtoms::_false, eIgnoreCase);
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}
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bool HTMLImageElement::Complete() {
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// It is still not clear what value should img.complete return in various
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// cases, see https://github.com/whatwg/html/issues/4884
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if (!HasAttr(nsGkAtoms::srcset) && !HasNonEmptyAttr(nsGkAtoms::src)) {
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return true;
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}
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if (!mCurrentRequest || mPendingRequest) {
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return false;
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}
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uint32_t status;
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mCurrentRequest->GetImageStatus(&status);
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return (status &
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(imgIRequest::STATUS_LOAD_COMPLETE | imgIRequest::STATUS_ERROR)) != 0;
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}
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CSSIntPoint HTMLImageElement::GetXY() {
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nsIFrame* frame = GetPrimaryFrame(FlushType::Layout);
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if (!frame) {
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return CSSIntPoint(0, 0);
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}
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nsIFrame* layer = nsLayoutUtils::GetClosestLayer(frame->GetParent());
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return CSSIntPoint::FromAppUnitsRounded(frame->GetOffsetTo(layer));
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}
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int32_t HTMLImageElement::X() { return GetXY().x; }
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int32_t HTMLImageElement::Y() { return GetXY().y; }
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void HTMLImageElement::GetDecoding(nsAString& aValue) {
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GetEnumAttr(nsGkAtoms::decoding, kDecodingTableDefault->tag, aValue);
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}
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// https://whatpr.org/html/3752/urls-and-fetching.html#lazy-loading-attributes
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static const nsAttrValue::EnumTable kLoadingTable[] = {
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{"eager", HTMLImageElement::Loading::Eager},
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{"lazy", HTMLImageElement::Loading::Lazy},
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{nullptr, 0}};
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void HTMLImageElement::GetLoading(nsAString& aValue) const {
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GetEnumAttr(nsGkAtoms::loading, kLoadingTable[0].tag, aValue);
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}
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HTMLImageElement::Loading HTMLImageElement::LoadingState() const {
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const nsAttrValue* val = mAttrs.GetAttr(nsGkAtoms::loading);
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if (!val) {
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return HTMLImageElement::Loading::Eager;
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}
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return static_cast<HTMLImageElement::Loading>(val->GetEnumValue());
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}
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already_AddRefed<Promise> HTMLImageElement::Decode(ErrorResult& aRv) {
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return nsImageLoadingContent::QueueDecodeAsync(aRv);
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}
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bool HTMLImageElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAString& aValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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nsAttrValue& aResult) {
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if (aNamespaceID == kNameSpaceID_None) {
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if (aAttribute == nsGkAtoms::align) {
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return ParseAlignValue(aValue, aResult);
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}
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if (aAttribute == nsGkAtoms::crossorigin) {
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ParseCORSValue(aValue, aResult);
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return true;
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}
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if (aAttribute == nsGkAtoms::decoding) {
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return aResult.ParseEnumValue(aValue, kDecodingTable,
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/* aCaseSensitive = */ false,
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kDecodingTableDefault);
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}
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if (aAttribute == nsGkAtoms::loading) {
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return aResult.ParseEnumValue(aValue, kLoadingTable,
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/* aCaseSensitive = */ false,
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kLoadingTable);
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}
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if (ParseImageAttribute(aAttribute, aValue, aResult)) {
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return true;
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}
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}
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return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
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aMaybeScriptedPrincipal, aResult);
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}
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void HTMLImageElement::MapAttributesIntoRule(
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const nsMappedAttributes* aAttributes, MappedDeclarations& aDecls) {
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MapImageAlignAttributeInto(aAttributes, aDecls);
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MapImageBorderAttributeInto(aAttributes, aDecls);
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MapImageMarginAttributeInto(aAttributes, aDecls);
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MapImageSizeAttributesInto(aAttributes, aDecls, MapAspectRatio::Yes);
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MapCommonAttributesInto(aAttributes, aDecls);
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}
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nsChangeHint HTMLImageElement::GetAttributeChangeHint(const nsAtom* aAttribute,
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int32_t aModType) const {
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nsChangeHint retval =
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nsGenericHTMLElement::GetAttributeChangeHint(aAttribute, aModType);
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if (aAttribute == nsGkAtoms::usemap || aAttribute == nsGkAtoms::ismap) {
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retval |= nsChangeHint_ReconstructFrame;
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} else if (aAttribute == nsGkAtoms::alt) {
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if (aModType == MutationEvent_Binding::ADDITION ||
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aModType == MutationEvent_Binding::REMOVAL) {
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retval |= nsChangeHint_ReconstructFrame;
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}
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}
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return retval;
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}
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NS_IMETHODIMP_(bool)
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HTMLImageElement::IsAttributeMapped(const nsAtom* aAttribute) const {
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static const MappedAttributeEntry* const map[] = {
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sCommonAttributeMap, sImageMarginSizeAttributeMap,
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sImageBorderAttributeMap, sImageAlignAttributeMap};
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return FindAttributeDependence(aAttribute, map);
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}
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nsMapRuleToAttributesFunc HTMLImageElement::GetAttributeMappingFunction()
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const {
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return &MapAttributesIntoRule;
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}
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nsresult HTMLImageElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValueOrString* aValue,
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bool aNotify) {
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if (aNameSpaceID == kNameSpaceID_None && mForm &&
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(aName == nsGkAtoms::name || aName == nsGkAtoms::id)) {
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// remove the image from the hashtable as needed
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nsAutoString tmp;
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GetAttr(kNameSpaceID_None, aName, tmp);
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if (!tmp.IsEmpty()) {
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mForm->RemoveImageElementFromTable(this, tmp);
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}
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}
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return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
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aNotify);
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}
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nsresult HTMLImageElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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bool aNotify) {
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if (aNameSpaceID != kNameSpaceID_None) {
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return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue,
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aOldValue,
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aMaybeScriptedPrincipal, aNotify);
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}
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nsAttrValueOrString attrVal(aValue);
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if (aValue) {
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AfterMaybeChangeAttr(aNameSpaceID, aName, attrVal, aOldValue,
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aMaybeScriptedPrincipal, aNotify);
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}
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if (mForm && (aName == nsGkAtoms::name || aName == nsGkAtoms::id) && aValue &&
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!aValue->IsEmptyString()) {
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// add the image to the hashtable as needed
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MOZ_ASSERT(aValue->Type() == nsAttrValue::eAtom,
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"Expected atom value for name/id");
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mForm->AddImageElementToTable(
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this, nsDependentAtomString(aValue->GetAtomValue()));
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}
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bool forceReload = false;
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if (aName == nsGkAtoms::loading) {
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if (aValue &&
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static_cast<HTMLImageElement::Loading>(aValue->GetEnumValue()) ==
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Loading::Lazy &&
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!ImageState().HasState(NS_EVENT_STATE_LOADING)) {
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SetLazyLoading();
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} else if (aOldValue &&
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static_cast<HTMLImageElement::Loading>(
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aOldValue->GetEnumValue()) == Loading::Lazy &&
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!ImageState().HasState(NS_EVENT_STATE_LOADING)) {
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StopLazyLoadingAndStartLoadIfNeeded();
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}
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} else if (aName == nsGkAtoms::src && !aValue) {
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// NOTE: regular src value changes are handled in AfterMaybeChangeAttr, so
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// this only needs to handle unsetting the src attribute.
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// Mark channel as urgent-start before load image if the image load is
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// initaiated by a user interaction.
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mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
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// AfterMaybeChangeAttr handles setting src since it needs to catch
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// img.src = img.src, so we only need to handle the unset case
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if (InResponsiveMode()) {
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if (mResponsiveSelector && mResponsiveSelector->Content() == this) {
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mResponsiveSelector->SetDefaultSource(VoidString());
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}
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QueueImageLoadTask(true);
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} else {
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// Bug 1076583 - We still behave synchronously in the non-responsive case
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CancelImageRequests(aNotify);
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}
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} else if (aName == nsGkAtoms::srcset) {
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// Mark channel as urgent-start before load image if the image load is
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// initaiated by a user interaction.
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mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
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mSrcsetTriggeringPrincipal = aMaybeScriptedPrincipal;
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PictureSourceSrcsetChanged(this, attrVal.String(), aNotify);
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} else if (aName == nsGkAtoms::sizes) {
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// Mark channel as urgent-start before load image if the image load is
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// initiated by a user interaction.
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mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
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PictureSourceSizesChanged(this, attrVal.String(), aNotify);
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} else if (aName == nsGkAtoms::decoding) {
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// Request sync or async image decoding.
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SetSyncDecodingHint(
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aValue && static_cast<ImageDecodingType>(aValue->GetEnumValue()) ==
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ImageDecodingType::Sync);
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} else if (aName == nsGkAtoms::referrerpolicy) {
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ReferrerPolicy referrerPolicy = GetReferrerPolicyAsEnum();
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// FIXME(emilio): Why only when not in responsive mode? Also see below for
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// aNotify.
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forceReload = aNotify && !InResponsiveMode() &&
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referrerPolicy != ReferrerPolicy::_empty &&
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referrerPolicy != ReferrerPolicyFromAttr(aOldValue);
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} else if (aName == nsGkAtoms::crossorigin) {
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// FIXME(emilio): The aNotify bit seems a bit suspicious, but it is useful
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// to avoid extra sync loads, specially in non-responsive mode. Ideally we
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// can unify the responsive and non-responsive code paths (bug 1076583), and
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// simplify this a bit.
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forceReload = aNotify && GetCORSMode() != AttrValueToCORSMode(aOldValue);
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}
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if (forceReload) {
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// Because we load image synchronously in non-responsive-mode, we need to do
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// reload after the attribute has been set if the reload is triggered by
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// cross origin / referrer policy changing.
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//
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// Mark channel as urgent-start before load image if the image load is
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// initiated by a user interaction.
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mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
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if (InResponsiveMode()) {
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// Per spec, full selection runs when this changes, even though
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// it doesn't directly affect the source selection
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QueueImageLoadTask(true);
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} else if (ShouldLoadImage()) {
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// Bug 1076583 - We still use the older synchronous algorithm in
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// non-responsive mode. Force a new load of the image with the
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// new cross origin policy
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ForceReload(aNotify, IgnoreErrors());
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}
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}
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return nsGenericHTMLElement::AfterSetAttr(
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aNameSpaceID, aName, aValue, aOldValue, aMaybeScriptedPrincipal, aNotify);
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}
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nsresult HTMLImageElement::OnAttrSetButNotChanged(
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int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString& aValue,
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bool aNotify) {
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AfterMaybeChangeAttr(aNamespaceID, aName, aValue, nullptr, nullptr, aNotify);
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return nsGenericHTMLElement::OnAttrSetButNotChanged(aNamespaceID, aName,
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aValue, aNotify);
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}
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void HTMLImageElement::AfterMaybeChangeAttr(
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int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString& aValue,
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const nsAttrValue* aOldValue, nsIPrincipal* aMaybeScriptedPrincipal,
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bool aNotify) {
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if (aNamespaceID != kNameSpaceID_None || aName != nsGkAtoms::src) {
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return;
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}
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// We need to force our image to reload. This must be done here, not in
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// AfterSetAttr or BeforeSetAttr, because we want to do it even if the attr is
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// being set to its existing value, which is normally optimized away as a
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// no-op.
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//
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// If we are in responsive mode, we drop the forced reload behavior,
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// but still trigger a image load task for img.src = img.src per
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// spec.
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//
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// Both cases handle unsetting src in AfterSetAttr
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// Mark channel as urgent-start before load image if the image load is
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// initaiated by a user interaction.
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mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
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mSrcTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
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this, aValue.String(), aMaybeScriptedPrincipal);
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if (InResponsiveMode()) {
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if (mResponsiveSelector && mResponsiveSelector->Content() == this) {
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mResponsiveSelector->SetDefaultSource(aValue.String(),
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mSrcTriggeringPrincipal);
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}
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QueueImageLoadTask(true);
|
|
} else if (aNotify && ShouldLoadImage()) {
|
|
// If aNotify is false, we are coming from the parser or some such place;
|
|
// we'll get bound after all the attributes have been set, so we'll do the
|
|
// sync image load from BindToTree. Skip the LoadImage call in that case.
|
|
|
|
// Note that this sync behavior is partially removed from the spec, bug
|
|
// 1076583
|
|
|
|
// A hack to get animations to reset. See bug 594771.
|
|
mNewRequestsWillNeedAnimationReset = true;
|
|
|
|
// Force image loading here, so that we'll try to load the image from
|
|
// network if it's set to be not cacheable.
|
|
// Potentially, false could be passed here rather than aNotify since
|
|
// UpdateState will be called by SetAttrAndNotify, but there are two
|
|
// obstacles to this: 1) LoadImage will end up calling
|
|
// UpdateState(aNotify), and we do not want it to call UpdateState(false)
|
|
// when aNotify is true, and 2) When this function is called by
|
|
// OnAttrSetButNotChanged, SetAttrAndNotify will not subsequently call
|
|
// UpdateState.
|
|
LoadImage(aValue.String(), true, aNotify, eImageLoadType_Normal,
|
|
mSrcTriggeringPrincipal);
|
|
|
|
mNewRequestsWillNeedAnimationReset = false;
|
|
}
|
|
}
|
|
|
|
void HTMLImageElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
|
|
// We handle image element with attribute ismap in its corresponding frame
|
|
// element. Set mMultipleActionsPrevented here to prevent the click event
|
|
// trigger the behaviors in Element::PostHandleEventForLinks
|
|
WidgetMouseEvent* mouseEvent = aVisitor.mEvent->AsMouseEvent();
|
|
if (mouseEvent && mouseEvent->IsLeftClickEvent() && IsMap()) {
|
|
mouseEvent->mFlags.mMultipleActionsPrevented = true;
|
|
}
|
|
nsGenericHTMLElement::GetEventTargetParent(aVisitor);
|
|
}
|
|
|
|
bool HTMLImageElement::IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
|
|
int32_t* aTabIndex) {
|
|
int32_t tabIndex = TabIndex();
|
|
|
|
if (IsInComposedDoc() && FindImageMap()) {
|
|
if (aTabIndex) {
|
|
// Use tab index on individual map areas
|
|
*aTabIndex = (sTabFocusModel & eTabFocus_linksMask) ? 0 : -1;
|
|
}
|
|
// Image map is not focusable itself, but flag as tabbable
|
|
// so that image map areas get walked into.
|
|
*aIsFocusable = false;
|
|
|
|
return false;
|
|
}
|
|
|
|
if (aTabIndex) {
|
|
// Can be in tab order if tabindex >=0 and form controls are tabbable.
|
|
*aTabIndex = (sTabFocusModel & eTabFocus_formElementsMask) ? tabIndex : -1;
|
|
}
|
|
|
|
*aIsFocusable =
|
|
#ifdef XP_MACOSX
|
|
(!aWithMouse || nsFocusManager::sMouseFocusesFormControl) &&
|
|
#endif
|
|
(tabIndex >= 0 || GetTabIndexAttrValue().isSome());
|
|
|
|
return false;
|
|
}
|
|
|
|
nsresult HTMLImageElement::BindToTree(BindContext& aContext, nsINode& aParent) {
|
|
nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
nsImageLoadingContent::BindToTree(aContext, aParent);
|
|
|
|
UpdateFormOwner();
|
|
|
|
if (HaveSrcsetOrInPicture()) {
|
|
if (IsInComposedDoc() && !mInDocResponsiveContent) {
|
|
aContext.OwnerDoc().AddResponsiveContent(this);
|
|
mInDocResponsiveContent = true;
|
|
}
|
|
|
|
// Mark channel as urgent-start before load image if the image load is
|
|
// initaiated by a user interaction.
|
|
mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
|
|
|
|
// Run selection algorithm when an img element is inserted into a document
|
|
// in order to react to changes in the environment. See note of
|
|
// https://html.spec.whatwg.org/multipage/embedded-content.html#img-environment-changes
|
|
QueueImageLoadTask(false);
|
|
} else if (!InResponsiveMode() &&
|
|
HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
|
|
// We skip loading when our attributes were set from parser land,
|
|
// so trigger a aForce=false load now to check if things changed.
|
|
// This isn't necessary for responsive mode, since creating the
|
|
// image load task is asynchronous we don't need to take special
|
|
// care to avoid doing so when being filled by the parser.
|
|
|
|
// Mark channel as urgent-start before load image if the image load is
|
|
// initaiated by a user interaction.
|
|
mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
|
|
|
|
// We still act synchronously for the non-responsive case (Bug
|
|
// 1076583), but still need to delay if it is unsafe to run
|
|
// script.
|
|
|
|
// If loading is temporarily disabled, don't even launch MaybeLoadImage.
|
|
// Otherwise MaybeLoadImage may run later when someone has reenabled
|
|
// loading.
|
|
if (LoadingEnabled() && ShouldLoadImage()) {
|
|
nsContentUtils::AddScriptRunner(
|
|
NewRunnableMethod<bool>("dom::HTMLImageElement::MaybeLoadImage", this,
|
|
&HTMLImageElement::MaybeLoadImage, false));
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
void HTMLImageElement::UnbindFromTree(bool aNullParent) {
|
|
if (mForm) {
|
|
if (aNullParent || !FindAncestorForm(mForm)) {
|
|
ClearForm(true);
|
|
} else {
|
|
UnsetFlags(MAYBE_ORPHAN_FORM_ELEMENT);
|
|
}
|
|
}
|
|
|
|
if (mInDocResponsiveContent) {
|
|
OwnerDoc()->RemoveResponsiveContent(this);
|
|
mInDocResponsiveContent = false;
|
|
}
|
|
|
|
nsImageLoadingContent::UnbindFromTree(aNullParent);
|
|
nsGenericHTMLElement::UnbindFromTree(aNullParent);
|
|
}
|
|
|
|
void HTMLImageElement::UpdateFormOwner() {
|
|
if (!mForm) {
|
|
mForm = FindAncestorForm();
|
|
}
|
|
|
|
if (mForm && !HasFlag(ADDED_TO_FORM)) {
|
|
// Now we need to add ourselves to the form
|
|
nsAutoString nameVal, idVal;
|
|
GetAttr(kNameSpaceID_None, nsGkAtoms::name, nameVal);
|
|
GetAttr(kNameSpaceID_None, nsGkAtoms::id, idVal);
|
|
|
|
SetFlags(ADDED_TO_FORM);
|
|
|
|
mForm->AddImageElement(this);
|
|
|
|
if (!nameVal.IsEmpty()) {
|
|
mForm->AddImageElementToTable(this, nameVal);
|
|
}
|
|
|
|
if (!idVal.IsEmpty()) {
|
|
mForm->AddImageElementToTable(this, idVal);
|
|
}
|
|
}
|
|
}
|
|
|
|
void HTMLImageElement::MaybeLoadImage(bool aAlwaysForceLoad) {
|
|
// Our base URI may have changed, or we may have had responsive parameters
|
|
// change while not bound to the tree. Re-parse src/srcset and call LoadImage,
|
|
// which is a no-op if it resolves to the same effective URI without aForce.
|
|
|
|
// Note, check LoadingEnabled() after LoadImage call.
|
|
|
|
LoadSelectedImage(aAlwaysForceLoad, /* aNotify */ true, aAlwaysForceLoad);
|
|
|
|
if (!LoadingEnabled()) {
|
|
CancelImageRequests(true);
|
|
}
|
|
}
|
|
|
|
EventStates HTMLImageElement::IntrinsicState() const {
|
|
return nsGenericHTMLElement::IntrinsicState() |
|
|
nsImageLoadingContent::ImageState();
|
|
}
|
|
|
|
void HTMLImageElement::NodeInfoChanged(Document* aOldDoc) {
|
|
nsGenericHTMLElement::NodeInfoChanged(aOldDoc);
|
|
|
|
if (mLazyLoading) {
|
|
aOldDoc->GetLazyLoadImageObserver()->Unobserve(*this);
|
|
mLazyLoading = false;
|
|
SetLazyLoading();
|
|
}
|
|
|
|
// Force reload image if adoption steps are run.
|
|
// If loading is temporarily disabled, don't even launch script runner.
|
|
// Otherwise script runner may run later when someone has reenabled loading.
|
|
StartLoadingIfNeeded();
|
|
}
|
|
|
|
// static
|
|
already_AddRefed<HTMLImageElement> HTMLImageElement::Image(
|
|
const GlobalObject& aGlobal, const Optional<uint32_t>& aWidth,
|
|
const Optional<uint32_t>& aHeight, ErrorResult& aError) {
|
|
nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aGlobal.GetAsSupports());
|
|
Document* doc;
|
|
if (!win || !(doc = win->GetExtantDoc())) {
|
|
aError.Throw(NS_ERROR_FAILURE);
|
|
return nullptr;
|
|
}
|
|
|
|
RefPtr<mozilla::dom::NodeInfo> nodeInfo = doc->NodeInfoManager()->GetNodeInfo(
|
|
nsGkAtoms::img, nullptr, kNameSpaceID_XHTML, ELEMENT_NODE);
|
|
|
|
auto* nim = nodeInfo->NodeInfoManager();
|
|
RefPtr<HTMLImageElement> img = new (nim) HTMLImageElement(nodeInfo.forget());
|
|
|
|
if (aWidth.WasPassed()) {
|
|
img->SetWidth(aWidth.Value(), aError);
|
|
if (aError.Failed()) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (aHeight.WasPassed()) {
|
|
img->SetHeight(aHeight.Value(), aError);
|
|
if (aError.Failed()) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
return img.forget();
|
|
}
|
|
|
|
uint32_t HTMLImageElement::Height() {
|
|
RefPtr<imgRequestProxy> currentRequest(mCurrentRequest);
|
|
return GetWidthHeightForImage(currentRequest).height;
|
|
}
|
|
|
|
uint32_t HTMLImageElement::Width() {
|
|
RefPtr<imgRequestProxy> currentRequest(mCurrentRequest);
|
|
return GetWidthHeightForImage(currentRequest).width;
|
|
}
|
|
|
|
uint32_t HTMLImageElement::NaturalHeight() {
|
|
uint32_t height = nsImageLoadingContent::NaturalHeight();
|
|
|
|
if (mResponsiveSelector) {
|
|
double density = mResponsiveSelector->GetSelectedImageDensity();
|
|
MOZ_ASSERT(density >= 0.0);
|
|
height = NSToIntRound(double(height) / density);
|
|
}
|
|
|
|
return height;
|
|
}
|
|
|
|
uint32_t HTMLImageElement::NaturalWidth() {
|
|
uint32_t width = nsImageLoadingContent::NaturalWidth();
|
|
|
|
if (mResponsiveSelector) {
|
|
double density = mResponsiveSelector->GetSelectedImageDensity();
|
|
MOZ_ASSERT(density >= 0.0);
|
|
width = NSToIntRound(double(width) / density);
|
|
}
|
|
|
|
return width;
|
|
}
|
|
|
|
nsresult HTMLImageElement::CopyInnerTo(HTMLImageElement* aDest) {
|
|
bool destIsStatic = aDest->OwnerDoc()->IsStaticDocument();
|
|
if (destIsStatic) {
|
|
CreateStaticImageClone(aDest);
|
|
}
|
|
|
|
nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
|
|
if (!destIsStatic) {
|
|
// In SetAttr (called from nsGenericHTMLElement::CopyInnerTo), aDest skipped
|
|
// doing the image load because we passed in false for aNotify. But we
|
|
// really do want it to do the load, so set it up to happen once the cloning
|
|
// reaches a stable state.
|
|
if (!aDest->InResponsiveMode() &&
|
|
aDest->HasAttr(kNameSpaceID_None, nsGkAtoms::src) &&
|
|
aDest->ShouldLoadImage()) {
|
|
// Mark channel as urgent-start before load image if the image load is
|
|
// initaiated by a user interaction.
|
|
mUseUrgentStartForChannel = UserActivation::IsHandlingUserInput();
|
|
|
|
nsContentUtils::AddScriptRunner(NewRunnableMethod<bool>(
|
|
"dom::HTMLImageElement::MaybeLoadImage", aDest,
|
|
&HTMLImageElement::MaybeLoadImage, false));
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
CORSMode HTMLImageElement::GetCORSMode() {
|
|
return AttrValueToCORSMode(GetParsedAttr(nsGkAtoms::crossorigin));
|
|
}
|
|
|
|
JSObject* HTMLImageElement::WrapNode(JSContext* aCx,
|
|
JS::Handle<JSObject*> aGivenProto) {
|
|
return HTMLImageElement_Binding::Wrap(aCx, this, aGivenProto);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
HTMLFormElement* HTMLImageElement::GetForm() const { return mForm; }
|
|
#endif
|
|
|
|
void HTMLImageElement::SetForm(HTMLFormElement* aForm) {
|
|
MOZ_ASSERT(aForm, "Don't pass null here");
|
|
NS_ASSERTION(!mForm,
|
|
"We don't support switching from one non-null form to another.");
|
|
|
|
mForm = aForm;
|
|
}
|
|
|
|
void HTMLImageElement::ClearForm(bool aRemoveFromForm) {
|
|
NS_ASSERTION((mForm != nullptr) == HasFlag(ADDED_TO_FORM),
|
|
"Form control should have had flag set correctly");
|
|
|
|
if (!mForm) {
|
|
return;
|
|
}
|
|
|
|
if (aRemoveFromForm) {
|
|
nsAutoString nameVal, idVal;
|
|
GetAttr(kNameSpaceID_None, nsGkAtoms::name, nameVal);
|
|
GetAttr(kNameSpaceID_None, nsGkAtoms::id, idVal);
|
|
|
|
mForm->RemoveImageElement(this);
|
|
|
|
if (!nameVal.IsEmpty()) {
|
|
mForm->RemoveImageElementFromTable(this, nameVal);
|
|
}
|
|
|
|
if (!idVal.IsEmpty()) {
|
|
mForm->RemoveImageElementFromTable(this, idVal);
|
|
}
|
|
}
|
|
|
|
UnsetFlags(ADDED_TO_FORM);
|
|
mForm = nullptr;
|
|
}
|
|
|
|
void HTMLImageElement::QueueImageLoadTask(bool aAlwaysLoad) {
|
|
// If loading is temporarily disabled, we don't want to queue tasks
|
|
// that may then run when loading is re-enabled.
|
|
if (!LoadingEnabled() || !ShouldLoadImage()) {
|
|
return;
|
|
}
|
|
|
|
// Ensure that we don't overwrite a previous load request that requires
|
|
// a complete load to occur.
|
|
bool alwaysLoad = aAlwaysLoad;
|
|
if (mPendingImageLoadTask) {
|
|
alwaysLoad = alwaysLoad || mPendingImageLoadTask->AlwaysLoad();
|
|
}
|
|
RefPtr<ImageLoadTask> task =
|
|
new ImageLoadTask(this, alwaysLoad, mUseUrgentStartForChannel);
|
|
// The task checks this to determine if it was the last
|
|
// queued event, and so earlier tasks are implicitly canceled.
|
|
mPendingImageLoadTask = task;
|
|
CycleCollectedJSContext::Get()->DispatchToMicroTask(task.forget());
|
|
}
|
|
|
|
bool HTMLImageElement::HaveSrcsetOrInPicture() {
|
|
if (HasAttr(kNameSpaceID_None, nsGkAtoms::srcset)) {
|
|
return true;
|
|
}
|
|
|
|
Element* parent = nsINode::GetParentElement();
|
|
return (parent && parent->IsHTMLElement(nsGkAtoms::picture));
|
|
}
|
|
|
|
bool HTMLImageElement::InResponsiveMode() {
|
|
// When we lose srcset or leave a <picture> element, the fallback to img.src
|
|
// will happen from the microtask, and we should behave responsively in the
|
|
// interim
|
|
return mResponsiveSelector || mPendingImageLoadTask ||
|
|
HaveSrcsetOrInPicture();
|
|
}
|
|
|
|
bool HTMLImageElement::SelectedSourceMatchesLast(nsIURI* aSelectedSource) {
|
|
// If there was no selected source previously, we don't want to short-circuit
|
|
// the load. Similarly for if there is no newly selected source.
|
|
if (!mLastSelectedSource || !aSelectedSource) {
|
|
return false;
|
|
}
|
|
bool equal = false;
|
|
return NS_SUCCEEDED(mLastSelectedSource->Equals(aSelectedSource, &equal)) &&
|
|
equal;
|
|
}
|
|
|
|
nsresult HTMLImageElement::LoadSelectedImage(bool aForce, bool aNotify,
|
|
bool aAlwaysLoad) {
|
|
double currentDensity = 1.0; // default to 1.0 for the src attribute case
|
|
|
|
// Helper to update state when only density may have changed (i.e., the source
|
|
// to load hasn't changed, and we don't do any request at all). We need (apart
|
|
// from updating our internal state) to tell the image frame because its
|
|
// intrinsic size may have changed.
|
|
//
|
|
// In the case we actually trigger a new load, that load will trigger a call
|
|
// to nsImageFrame::NotifyNewCurrentRequest, which takes care of that for us.
|
|
auto UpdateDensityOnly = [&]() -> void {
|
|
if (mCurrentDensity == currentDensity) {
|
|
return;
|
|
}
|
|
mCurrentDensity = currentDensity;
|
|
if (nsImageFrame* f = do_QueryFrame(GetPrimaryFrame())) {
|
|
f->ResponsiveContentDensityChanged();
|
|
}
|
|
};
|
|
|
|
if (aForce) {
|
|
// In responsive mode we generally want to re-run the full selection
|
|
// algorithm whenever starting a new load, per spec.
|
|
//
|
|
// This also causes us to re-resolve the URI as appropriate.
|
|
const bool sourceChanged = UpdateResponsiveSource();
|
|
|
|
if (mResponsiveSelector) {
|
|
currentDensity = mResponsiveSelector->GetSelectedImageDensity();
|
|
}
|
|
|
|
if (!sourceChanged && !aAlwaysLoad) {
|
|
UpdateDensityOnly();
|
|
return NS_OK;
|
|
}
|
|
} else if (mResponsiveSelector) {
|
|
currentDensity = mResponsiveSelector->GetSelectedImageDensity();
|
|
}
|
|
|
|
nsresult rv = NS_ERROR_FAILURE;
|
|
nsCOMPtr<nsIURI> selectedSource;
|
|
if (mResponsiveSelector) {
|
|
nsCOMPtr<nsIURI> url = mResponsiveSelector->GetSelectedImageURL();
|
|
nsCOMPtr<nsIPrincipal> triggeringPrincipal =
|
|
mResponsiveSelector->GetSelectedImageTriggeringPrincipal();
|
|
selectedSource = url;
|
|
if (!aAlwaysLoad && SelectedSourceMatchesLast(selectedSource)) {
|
|
UpdateDensityOnly();
|
|
return NS_OK;
|
|
}
|
|
if (url) {
|
|
rv = LoadImage(url, aForce, aNotify, eImageLoadType_Imageset,
|
|
triggeringPrincipal);
|
|
}
|
|
} else {
|
|
nsAutoString src;
|
|
if (!GetAttr(kNameSpaceID_None, nsGkAtoms::src, src)) {
|
|
CancelImageRequests(aNotify);
|
|
rv = NS_OK;
|
|
} else {
|
|
Document* doc = OwnerDoc();
|
|
StringToURI(src, doc, getter_AddRefs(selectedSource));
|
|
if (!aAlwaysLoad && SelectedSourceMatchesLast(selectedSource)) {
|
|
UpdateDensityOnly();
|
|
return NS_OK;
|
|
}
|
|
|
|
// If we have a srcset attribute or are in a <picture> element,
|
|
// we always use the Imageset load type, even if we parsed no
|
|
// valid responsive sources from either, per spec.
|
|
rv = LoadImage(src, aForce, aNotify,
|
|
HaveSrcsetOrInPicture() ? eImageLoadType_Imageset
|
|
: eImageLoadType_Normal,
|
|
mSrcTriggeringPrincipal);
|
|
}
|
|
}
|
|
mLastSelectedSource = selectedSource;
|
|
mCurrentDensity = currentDensity;
|
|
|
|
if (NS_FAILED(rv)) {
|
|
CancelImageRequests(aNotify);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
void HTMLImageElement::PictureSourceSrcsetChanged(nsIContent* aSourceNode,
|
|
const nsAString& aNewValue,
|
|
bool aNotify) {
|
|
MOZ_ASSERT(aSourceNode == this || IsPreviousSibling(aSourceNode, this),
|
|
"Should not be getting notifications for non-previous-siblings");
|
|
|
|
nsIContent* currentSrc =
|
|
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
|
|
|
|
if (aSourceNode == currentSrc) {
|
|
// We're currently using this node as our responsive selector
|
|
// source.
|
|
nsCOMPtr<nsIPrincipal> principal;
|
|
if (aSourceNode == this) {
|
|
principal = mSrcsetTriggeringPrincipal;
|
|
} else if (auto* source = HTMLSourceElement::FromNode(aSourceNode)) {
|
|
principal = source->GetSrcsetTriggeringPrincipal();
|
|
}
|
|
mResponsiveSelector->SetCandidatesFromSourceSet(aNewValue, principal);
|
|
}
|
|
|
|
if (!mInDocResponsiveContent && IsInComposedDoc()) {
|
|
OwnerDoc()->AddResponsiveContent(this);
|
|
mInDocResponsiveContent = true;
|
|
}
|
|
|
|
// This always triggers the image update steps per the spec, even if
|
|
// we are not using this source.
|
|
QueueImageLoadTask(true);
|
|
}
|
|
|
|
void HTMLImageElement::PictureSourceSizesChanged(nsIContent* aSourceNode,
|
|
const nsAString& aNewValue,
|
|
bool aNotify) {
|
|
MOZ_ASSERT(aSourceNode == this || IsPreviousSibling(aSourceNode, this),
|
|
"Should not be getting notifications for non-previous-siblings");
|
|
|
|
nsIContent* currentSrc =
|
|
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
|
|
|
|
if (aSourceNode == currentSrc) {
|
|
// We're currently using this node as our responsive selector
|
|
// source.
|
|
mResponsiveSelector->SetSizesFromDescriptor(aNewValue);
|
|
}
|
|
|
|
// This always triggers the image update steps per the spec, even if
|
|
// we are not using this source.
|
|
QueueImageLoadTask(true);
|
|
}
|
|
|
|
void HTMLImageElement::PictureSourceMediaOrTypeChanged(nsIContent* aSourceNode,
|
|
bool aNotify) {
|
|
MOZ_ASSERT(IsPreviousSibling(aSourceNode, this),
|
|
"Should not be getting notifications for non-previous-siblings");
|
|
|
|
// This always triggers the image update steps per the spec, even if
|
|
// we are not switching to/from this source
|
|
QueueImageLoadTask(true);
|
|
}
|
|
|
|
void HTMLImageElement::PictureSourceAdded(nsIContent* aSourceNode) {
|
|
MOZ_ASSERT(aSourceNode == this || IsPreviousSibling(aSourceNode, this),
|
|
"Should not be getting notifications for non-previous-siblings");
|
|
|
|
QueueImageLoadTask(true);
|
|
}
|
|
|
|
void HTMLImageElement::PictureSourceRemoved(nsIContent* aSourceNode) {
|
|
MOZ_ASSERT(aSourceNode == this || IsPreviousSibling(aSourceNode, this),
|
|
"Should not be getting notifications for non-previous-siblings");
|
|
|
|
QueueImageLoadTask(true);
|
|
}
|
|
|
|
bool HTMLImageElement::UpdateResponsiveSource() {
|
|
bool hadSelector = !!mResponsiveSelector;
|
|
|
|
nsIContent* currentSource =
|
|
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
|
|
Element* parent = nsINode::GetParentElement();
|
|
|
|
nsINode* candidateSource = nullptr;
|
|
if (parent && parent->IsHTMLElement(nsGkAtoms::picture)) {
|
|
// Walk source nodes previous to ourselves
|
|
candidateSource = parent->GetFirstChild();
|
|
} else {
|
|
candidateSource = this;
|
|
}
|
|
|
|
while (candidateSource) {
|
|
if (candidateSource == currentSource) {
|
|
// found no better source before current, re-run selection on
|
|
// that and keep it if it's still usable.
|
|
bool changed = mResponsiveSelector->SelectImage(true);
|
|
if (mResponsiveSelector->NumCandidates()) {
|
|
bool isUsableCandidate = true;
|
|
|
|
// an otherwise-usable source element may still have a media query that
|
|
// may not match any more.
|
|
if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
|
|
!SourceElementMatches(candidateSource->AsElement())) {
|
|
isUsableCandidate = false;
|
|
}
|
|
|
|
if (isUsableCandidate) {
|
|
return changed;
|
|
}
|
|
}
|
|
|
|
// no longer valid
|
|
mResponsiveSelector = nullptr;
|
|
if (candidateSource == this) {
|
|
// No further possibilities
|
|
break;
|
|
}
|
|
} else if (candidateSource == this) {
|
|
// We are the last possible source
|
|
if (!TryCreateResponsiveSelector(candidateSource->AsElement())) {
|
|
// Failed to find any source
|
|
mResponsiveSelector = nullptr;
|
|
}
|
|
break;
|
|
} else if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
|
|
TryCreateResponsiveSelector(candidateSource->AsElement())) {
|
|
// This led to a valid source, stop
|
|
break;
|
|
}
|
|
candidateSource = candidateSource->GetNextSibling();
|
|
}
|
|
|
|
if (!candidateSource) {
|
|
// Ran out of siblings without finding ourself, e.g. XBL magic.
|
|
mResponsiveSelector = nullptr;
|
|
}
|
|
|
|
// If we reach this point, either:
|
|
// - there was no selector originally, and there is not one now
|
|
// - there was no selector originally, and there is one now
|
|
// - there was a selector, and there is a different one now
|
|
// - there was a selector, and there is not one now
|
|
return hadSelector || mResponsiveSelector;
|
|
}
|
|
|
|
/*static */
|
|
bool HTMLImageElement::SupportedPictureSourceType(const nsAString& aType) {
|
|
nsAutoString type;
|
|
nsAutoString params;
|
|
|
|
nsContentUtils::SplitMimeType(aType, type, params);
|
|
if (type.IsEmpty()) {
|
|
return true;
|
|
}
|
|
|
|
return imgLoader::SupportImageWithMimeType(
|
|
NS_ConvertUTF16toUTF8(type).get(),
|
|
AcceptedMimeTypes::IMAGES_AND_DOCUMENTS);
|
|
}
|
|
|
|
bool HTMLImageElement::SourceElementMatches(Element* aSourceElement) {
|
|
MOZ_ASSERT(aSourceElement->IsHTMLElement(nsGkAtoms::source));
|
|
|
|
DebugOnly<Element*> parent(nsINode::GetParentElement());
|
|
MOZ_ASSERT(parent && parent->IsHTMLElement(nsGkAtoms::picture));
|
|
MOZ_ASSERT(IsPreviousSibling(aSourceElement, this));
|
|
|
|
// Check media and type
|
|
auto* src = static_cast<HTMLSourceElement*>(aSourceElement);
|
|
if (!src->MatchesCurrentMedia()) {
|
|
return false;
|
|
}
|
|
|
|
nsAutoString type;
|
|
if (src->GetAttr(kNameSpaceID_None, nsGkAtoms::type, type) &&
|
|
!SupportedPictureSourceType(type)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool HTMLImageElement::TryCreateResponsiveSelector(Element* aSourceElement) {
|
|
nsCOMPtr<nsIPrincipal> principal;
|
|
|
|
// Skip if this is not a <source> with matching media query
|
|
bool isSourceTag = aSourceElement->IsHTMLElement(nsGkAtoms::source);
|
|
if (isSourceTag) {
|
|
if (!SourceElementMatches(aSourceElement)) {
|
|
return false;
|
|
}
|
|
auto* source = HTMLSourceElement::FromNode(aSourceElement);
|
|
principal = source->GetSrcsetTriggeringPrincipal();
|
|
} else if (aSourceElement->IsHTMLElement(nsGkAtoms::img)) {
|
|
// Otherwise this is the <img> tag itself
|
|
MOZ_ASSERT(aSourceElement == this);
|
|
principal = mSrcsetTriggeringPrincipal;
|
|
}
|
|
|
|
// Skip if has no srcset or an empty srcset
|
|
nsString srcset;
|
|
if (!aSourceElement->GetAttr(kNameSpaceID_None, nsGkAtoms::srcset, srcset)) {
|
|
return false;
|
|
}
|
|
|
|
if (srcset.IsEmpty()) {
|
|
return false;
|
|
}
|
|
|
|
// Try to parse
|
|
RefPtr<ResponsiveImageSelector> sel =
|
|
new ResponsiveImageSelector(aSourceElement);
|
|
if (!sel->SetCandidatesFromSourceSet(srcset, principal)) {
|
|
// No possible candidates, don't need to bother parsing sizes
|
|
return false;
|
|
}
|
|
|
|
nsAutoString sizes;
|
|
aSourceElement->GetAttr(kNameSpaceID_None, nsGkAtoms::sizes, sizes);
|
|
sel->SetSizesFromDescriptor(sizes);
|
|
|
|
// If this is the <img> tag, also pull in src as the default source
|
|
if (!isSourceTag) {
|
|
MOZ_ASSERT(aSourceElement == this);
|
|
nsAutoString src;
|
|
if (GetAttr(kNameSpaceID_None, nsGkAtoms::src, src) && !src.IsEmpty()) {
|
|
sel->SetDefaultSource(src, mSrcTriggeringPrincipal);
|
|
}
|
|
}
|
|
|
|
mResponsiveSelector = sel;
|
|
return true;
|
|
}
|
|
|
|
/* static */
|
|
bool HTMLImageElement::SelectSourceForTagWithAttrs(
|
|
Document* aDocument, bool aIsSourceTag, const nsAString& aSrcAttr,
|
|
const nsAString& aSrcsetAttr, const nsAString& aSizesAttr,
|
|
const nsAString& aTypeAttr, const nsAString& aMediaAttr,
|
|
nsAString& aResult) {
|
|
MOZ_ASSERT(aIsSourceTag || (aTypeAttr.IsEmpty() && aMediaAttr.IsEmpty()),
|
|
"Passing type or media attrs makes no sense without aIsSourceTag");
|
|
MOZ_ASSERT(!aIsSourceTag || aSrcAttr.IsEmpty(),
|
|
"Passing aSrcAttr makes no sense with aIsSourceTag set");
|
|
|
|
if (aSrcsetAttr.IsEmpty()) {
|
|
if (!aIsSourceTag) {
|
|
// For an <img> with no srcset, we would always select the src attr.
|
|
aResult.Assign(aSrcAttr);
|
|
return true;
|
|
}
|
|
// Otherwise, a <source> without srcset is never selected
|
|
return false;
|
|
}
|
|
|
|
// Would not consider source tags with unsupported media or type
|
|
if (aIsSourceTag &&
|
|
((!aMediaAttr.IsVoid() && !HTMLSourceElement::WouldMatchMediaForDocument(
|
|
aMediaAttr, aDocument)) ||
|
|
(!aTypeAttr.IsVoid() && !SupportedPictureSourceType(aTypeAttr)))) {
|
|
return false;
|
|
}
|
|
|
|
// Using srcset or picture <source>, build a responsive selector for this tag.
|
|
RefPtr<ResponsiveImageSelector> sel = new ResponsiveImageSelector(aDocument);
|
|
|
|
sel->SetCandidatesFromSourceSet(aSrcsetAttr);
|
|
if (!aSizesAttr.IsEmpty()) {
|
|
sel->SetSizesFromDescriptor(aSizesAttr);
|
|
}
|
|
if (!aIsSourceTag) {
|
|
sel->SetDefaultSource(aSrcAttr);
|
|
}
|
|
|
|
if (sel->GetSelectedImageURLSpec(aResult)) {
|
|
return true;
|
|
}
|
|
|
|
if (!aIsSourceTag) {
|
|
// <img> tag with no match would definitively load nothing.
|
|
aResult.Truncate();
|
|
return true;
|
|
}
|
|
|
|
// <source> tags with no match would leave source yet-undetermined.
|
|
return false;
|
|
}
|
|
|
|
void HTMLImageElement::DestroyContent() {
|
|
mResponsiveSelector = nullptr;
|
|
|
|
nsGenericHTMLElement::DestroyContent();
|
|
}
|
|
|
|
void HTMLImageElement::MediaFeatureValuesChanged() {
|
|
QueueImageLoadTask(false);
|
|
}
|
|
|
|
bool HTMLImageElement::ShouldLoadImage() const {
|
|
return OwnerDoc()->ShouldLoadImages() && !mLazyLoading;
|
|
}
|
|
|
|
void HTMLImageElement::SetLazyLoading() {
|
|
if (mLazyLoading) {
|
|
return;
|
|
}
|
|
|
|
if (!StaticPrefs::dom_image_lazy_loading_enabled()) {
|
|
return;
|
|
}
|
|
|
|
// If scripting is disabled don't do lazy load.
|
|
// https://whatpr.org/html/3752/images.html#updating-the-image-data
|
|
if (!OwnerDoc()->IsScriptEnabled()) {
|
|
return;
|
|
}
|
|
|
|
// There (maybe) is a race condition that we have no LazyLoadImageObserver
|
|
// when the root document has been removed from the docshell.
|
|
// In the case we don't need to worry about lazy-loading.
|
|
OwnerDoc()->EnsureLazyLoadImageObserver().Observe(*this);
|
|
mLazyLoading = true;
|
|
UpdateImageState(true);
|
|
}
|
|
|
|
void HTMLImageElement::StartLoadingIfNeeded() {
|
|
if (LoadingEnabled() && ShouldLoadImage()) {
|
|
// Use script runner for the case the adopt is from appendChild.
|
|
// Bug 1076583 - We still behave synchronously in the non-responsive case
|
|
nsContentUtils::AddScriptRunner(
|
|
(InResponsiveMode())
|
|
? NewRunnableMethod<bool>(
|
|
"dom::HTMLImageElement::QueueImageLoadTask", this,
|
|
&HTMLImageElement::QueueImageLoadTask, true)
|
|
: NewRunnableMethod<bool>("dom::HTMLImageElement::MaybeLoadImage",
|
|
this, &HTMLImageElement::MaybeLoadImage,
|
|
true));
|
|
}
|
|
}
|
|
|
|
void HTMLImageElement::StopLazyLoadingAndStartLoadIfNeeded() {
|
|
if (!mLazyLoading) {
|
|
return;
|
|
}
|
|
mLazyLoading = false;
|
|
OwnerDoc()->GetLazyLoadImageObserver()->Unobserve(*this);
|
|
StartLoadingIfNeeded();
|
|
}
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|