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326d642792
The "current URL" in the spec: https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-currentsrc maps to imgIRequest.URI, not currentURI. Rename imgIRequest.currentURI to finalURI to prevent such confusion. MozReview-Commit-ID: CjBh2V4z8K9 --HG-- extra : rebase_source : 01277d16ef12845e12cc846f9dd4a21ceeca283b
1336 lines
37 KiB
C++
1336 lines
37 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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 "imgRequestProxy.h"
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#include "ImageLogging.h"
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#include "imgLoader.h"
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#include "Image.h"
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#include "ImageOps.h"
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#include "nsError.h"
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#include "nsCRTGlue.h"
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#include "imgINotificationObserver.h"
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#include "mozilla/dom/TabGroup.h" // for TabGroup
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#include "mozilla/dom/DocGroup.h" // for DocGroup
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#include "mozilla/Move.h"
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#include "mozilla/Telemetry.h" // for Telemetry
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using namespace mozilla;
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using namespace mozilla::image;
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// The split of imgRequestProxy and imgRequestProxyStatic means that
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// certain overridden functions need to be usable in the destructor.
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// Since virtual functions can't be used in that way, this class
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// provides a behavioural trait for each class to use instead.
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class ProxyBehaviour
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{
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public:
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virtual ~ProxyBehaviour() = default;
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virtual already_AddRefed<mozilla::image::Image> GetImage() const = 0;
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virtual bool HasImage() const = 0;
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virtual already_AddRefed<ProgressTracker> GetProgressTracker() const = 0;
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virtual imgRequest* GetOwner() const = 0;
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virtual void SetOwner(imgRequest* aOwner) = 0;
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};
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class RequestBehaviour : public ProxyBehaviour
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{
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public:
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RequestBehaviour() : mOwner(nullptr), mOwnerHasImage(false) {}
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already_AddRefed<mozilla::image::Image>GetImage() const override;
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bool HasImage() const override;
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already_AddRefed<ProgressTracker> GetProgressTracker() const override;
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imgRequest* GetOwner() const override {
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return mOwner;
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}
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void SetOwner(imgRequest* aOwner) override {
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mOwner = aOwner;
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if (mOwner) {
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RefPtr<ProgressTracker> ownerProgressTracker = GetProgressTracker();
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mOwnerHasImage = ownerProgressTracker && ownerProgressTracker->HasImage();
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} else {
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mOwnerHasImage = false;
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}
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}
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private:
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// We maintain the following invariant:
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// The proxy is registered at most with a single imgRequest as an observer,
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// and whenever it is, mOwner points to that object. This helps ensure that
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// imgRequestProxy::~imgRequestProxy unregisters the proxy as an observer
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// from whatever request it was registered with (if any). This, in turn,
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// means that imgRequest::mObservers will not have any stale pointers in it.
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RefPtr<imgRequest> mOwner;
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bool mOwnerHasImage;
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};
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already_AddRefed<mozilla::image::Image>
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RequestBehaviour::GetImage() const
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{
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if (!mOwnerHasImage) {
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return nullptr;
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}
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RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
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return progressTracker->GetImage();
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}
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already_AddRefed<ProgressTracker>
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RequestBehaviour::GetProgressTracker() const
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{
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// NOTE: It's possible that our mOwner has an Image that it didn't notify
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// us about, if we were Canceled before its Image was constructed.
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// (Canceling removes us as an observer, so mOwner has no way to notify us).
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// That's why this method uses mOwner->GetProgressTracker() instead of just
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// mOwner->mProgressTracker -- we might have a null mImage and yet have an
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// mOwner with a non-null mImage (and a null mProgressTracker pointer).
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return mOwner->GetProgressTracker();
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}
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NS_IMPL_ADDREF(imgRequestProxy)
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NS_IMPL_RELEASE(imgRequestProxy)
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NS_INTERFACE_MAP_BEGIN(imgRequestProxy)
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, imgIRequest)
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NS_INTERFACE_MAP_ENTRY(imgIRequest)
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NS_INTERFACE_MAP_ENTRY(nsIRequest)
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NS_INTERFACE_MAP_ENTRY(nsISupportsPriority)
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NS_INTERFACE_MAP_ENTRY(nsISecurityInfoProvider)
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsITimedChannel,
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TimedChannel() != nullptr)
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NS_INTERFACE_MAP_END
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imgRequestProxy::imgRequestProxy() :
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mBehaviour(new RequestBehaviour),
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mURI(nullptr),
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mListener(nullptr),
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mLoadFlags(nsIRequest::LOAD_NORMAL),
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mLockCount(0),
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mAnimationConsumers(0),
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mCanceled(false),
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mIsInLoadGroup(false),
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mForceDispatchLoadGroup(false),
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mListenerIsStrongRef(false),
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mDecodeRequested(false),
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mDeferNotifications(false),
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mHadListener(false),
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mHadDispatch(false)
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{
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/* member initializers and constructor code */
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LOG_FUNC(gImgLog, "imgRequestProxy::imgRequestProxy");
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}
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imgRequestProxy::~imgRequestProxy()
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{
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/* destructor code */
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NS_PRECONDITION(!mListener,
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"Someone forgot to properly cancel this request!");
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// If we had a listener, that means we would have issued notifications. With
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// bug 1359833, we added support for main thread scheduler groups. Each
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// imgRequestProxy may have its own associated listener, document and/or
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// scheduler group. Typically most imgRequestProxy belong to the same
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// document, or have no listener, which means we will want to execute all main
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// thread code in that shared scheduler group. Less frequently, there may be
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// multiple imgRequests and they have separate documents, which means that
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// when we issue state notifications, some or all need to be dispatched to the
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// appropriate scheduler group for each request. This should be rare, so we
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// want to monitor the frequency of dispatching in the wild.
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if (mHadListener) {
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mozilla::Telemetry::Accumulate(mozilla::Telemetry::IMAGE_REQUEST_DISPATCHED,
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mHadDispatch);
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}
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// Unlock the image the proper number of times if we're holding locks on
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// it. Note that UnlockImage() decrements mLockCount each time it's called.
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while (mLockCount) {
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UnlockImage();
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}
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ClearAnimationConsumers();
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// Explicitly set mListener to null to ensure that the RemoveProxy
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// call below can't send |this| to an arbitrary listener while |this|
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// is being destroyed. This is all belt-and-suspenders in view of the
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// above assert.
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NullOutListener();
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if (GetOwner()) {
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/* Call RemoveProxy with a successful status. This will keep the
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channel, if still downloading data, from being canceled if 'this' is
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the last observer. This allows the image to continue to download and
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be cached even if no one is using it currently.
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*/
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mCanceled = true;
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GetOwner()->RemoveProxy(this, NS_OK);
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}
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RemoveFromLoadGroup();
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LOG_FUNC(gImgLog, "imgRequestProxy::~imgRequestProxy");
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}
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nsresult
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imgRequestProxy::Init(imgRequest* aOwner,
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nsILoadGroup* aLoadGroup,
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nsIDocument* aLoadingDocument,
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ImageURL* aURI,
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imgINotificationObserver* aObserver)
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{
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NS_PRECONDITION(!GetOwner() && !mListener,
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"imgRequestProxy is already initialized");
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LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequestProxy::Init", "request",
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aOwner);
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MOZ_ASSERT(mAnimationConsumers == 0, "Cannot have animation before Init");
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mBehaviour->SetOwner(aOwner);
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mListener = aObserver;
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// Make sure to addref mListener before the AddToOwner call below, since
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// that call might well want to release it if the imgRequest has
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// already seen OnStopRequest.
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if (mListener) {
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mHadListener = true;
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mListenerIsStrongRef = true;
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NS_ADDREF(mListener);
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}
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mLoadGroup = aLoadGroup;
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mURI = aURI;
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// Note: AddToOwner won't send all the On* notifications immediately
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AddToOwner(aLoadingDocument);
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return NS_OK;
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}
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nsresult
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imgRequestProxy::ChangeOwner(imgRequest* aNewOwner)
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{
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NS_PRECONDITION(GetOwner(),
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"Cannot ChangeOwner on a proxy without an owner!");
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if (mCanceled) {
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// Ensure that this proxy has received all notifications to date
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// before we clean it up when removing it from the old owner below.
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SyncNotifyListener();
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}
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// If we're holding locks, unlock the old image.
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// Note that UnlockImage decrements mLockCount each time it's called.
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uint32_t oldLockCount = mLockCount;
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while (mLockCount) {
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UnlockImage();
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}
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// If we're holding animation requests, undo them.
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uint32_t oldAnimationConsumers = mAnimationConsumers;
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ClearAnimationConsumers();
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GetOwner()->RemoveProxy(this, NS_OK);
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mBehaviour->SetOwner(aNewOwner);
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// If we were locked, apply the locks here
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for (uint32_t i = 0; i < oldLockCount; i++) {
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LockImage();
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}
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// If we had animation requests, restore them here. Note that we
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// do this *after* RemoveProxy, which clears out animation consumers
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// (see bug 601723).
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for (uint32_t i = 0; i < oldAnimationConsumers; i++) {
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IncrementAnimationConsumers();
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}
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AddToOwner(nullptr);
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// If we'd previously requested a synchronous decode, request a decode on the
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// new image.
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if (mDecodeRequested) {
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StartDecoding(imgIContainer::FLAG_NONE);
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}
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return NS_OK;
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}
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bool
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imgRequestProxy::IsOnEventTarget() const
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{
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// Ensure we are in some main thread context because the scheduler group
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// methods are only safe to call on the main thread.
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MOZ_ASSERT(NS_IsMainThread());
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if (mTabGroup) {
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MOZ_ASSERT(mEventTarget);
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return mTabGroup->IsSafeToRun();
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}
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if (mListener) {
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// If we have no scheduler group but we do have a listener, then we know
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// that the listener requires unlabelled dispatch.
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MOZ_ASSERT(mEventTarget);
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return mozilla::SchedulerGroup::IsSafeToRunUnlabeled();
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}
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// No listener means it is always safe, as there is nothing to do.
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return true;
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}
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already_AddRefed<nsIEventTarget>
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imgRequestProxy::GetEventTarget() const
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{
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nsCOMPtr<nsIEventTarget> target(mEventTarget);
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return target.forget();
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}
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nsresult
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imgRequestProxy::DispatchWithTargetIfAvailable(already_AddRefed<nsIRunnable> aEvent)
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{
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LOG_FUNC(gImgLog, "imgRequestProxy::DispatchWithTargetIfAvailable");
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// This method should only be used when it is *expected* that we are
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// dispatching an event (e.g. we want to handle an event asynchronously)
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// rather we need to (e.g. we are in the wrong scheduler group context).
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// As such, we do not set mHadDispatch for telemetry purposes.
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if (mEventTarget) {
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mEventTarget->Dispatch(Move(aEvent), NS_DISPATCH_NORMAL);
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return NS_OK;
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}
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return NS_DispatchToMainThread(Move(aEvent));
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}
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void
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imgRequestProxy::DispatchWithTarget(already_AddRefed<nsIRunnable> aEvent)
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{
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LOG_FUNC(gImgLog, "imgRequestProxy::DispatchWithTarget");
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MOZ_ASSERT(mListener || mTabGroup);
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MOZ_ASSERT(mEventTarget);
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mHadDispatch = true;
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mEventTarget->Dispatch(Move(aEvent), NS_DISPATCH_NORMAL);
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}
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void
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imgRequestProxy::AddToOwner(nsIDocument* aLoadingDocument)
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{
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// An imgRequestProxy can be initialized with neither a listener nor a
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// document. The caller could follow up later by cloning the canonical
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// imgRequestProxy with the actual listener. This is possible because
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// imgLoader::LoadImage does not require a valid listener to be provided.
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//
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// Without a listener, we don't need to set our scheduler group, because
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// we have nothing to signal. However if we were told what document this
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// is for, it is likely that future listeners will belong to the same
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// scheduler group.
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//
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// With a listener, we always need to update our scheduler group. A null
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// scheduler group is valid with or without a document, but that means
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// we will use the most generic event target possible on dispatch.
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if (aLoadingDocument) {
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RefPtr<dom::DocGroup> docGroup = aLoadingDocument->GetDocGroup();
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if (docGroup) {
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mTabGroup = docGroup->GetTabGroup();
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MOZ_ASSERT(mTabGroup);
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mEventTarget = mTabGroup->EventTargetFor(mozilla::TaskCategory::Other);
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MOZ_ASSERT(mEventTarget);
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}
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}
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if (mListener && !mEventTarget) {
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mEventTarget = do_GetMainThread();
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}
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if (!GetOwner()) {
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return;
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}
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GetOwner()->AddProxy(this);
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}
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void
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imgRequestProxy::AddToLoadGroup()
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{
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NS_ASSERTION(!mIsInLoadGroup, "Whaa, we're already in the loadgroup!");
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MOZ_ASSERT(!mForceDispatchLoadGroup);
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/* While in theory there could be a dispatch outstanding to remove this
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request from the load group, in practice we only add to the load group
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(when previously not in a load group) at initialization. */
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if (!mIsInLoadGroup && mLoadGroup) {
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LOG_FUNC(gImgLog, "imgRequestProxy::AddToLoadGroup");
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mLoadGroup->AddRequest(this, nullptr);
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mIsInLoadGroup = true;
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}
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}
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void
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imgRequestProxy::RemoveFromLoadGroup()
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{
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if (!mIsInLoadGroup || !mLoadGroup) {
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return;
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}
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/* Sometimes we may not be able to remove ourselves from the load group in
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the current context. This is because our listeners are not re-entrant (e.g.
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we are in the middle of CancelAndForgetObserver or SyncClone). */
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if (mForceDispatchLoadGroup) {
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LOG_FUNC(gImgLog, "imgRequestProxy::RemoveFromLoadGroup -- dispatch");
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/* We take away the load group from the request temporarily; this prevents
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additional dispatches via RemoveFromLoadGroup occurring, as well as
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MoveToBackgroundInLoadGroup from removing and readding. This is safe
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because we know that once we get here, blocking the load group at all is
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unnecessary. */
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mIsInLoadGroup = false;
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nsCOMPtr<nsILoadGroup> loadGroup = Move(mLoadGroup);
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RefPtr<imgRequestProxy> self(this);
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DispatchWithTargetIfAvailable(NS_NewRunnableFunction(
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"imgRequestProxy::RemoveFromLoadGroup",
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[self, loadGroup]() -> void {
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loadGroup->RemoveRequest(self, nullptr, NS_OK);
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}));
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return;
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}
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LOG_FUNC(gImgLog, "imgRequestProxy::RemoveFromLoadGroup");
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/* calling RemoveFromLoadGroup may cause the document to finish
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loading, which could result in our death. We need to make sure
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that we stay alive long enough to fight another battle... at
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least until we exit this function. */
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nsCOMPtr<imgIRequest> kungFuDeathGrip(this);
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mLoadGroup->RemoveRequest(this, nullptr, NS_OK);
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mLoadGroup = nullptr;
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mIsInLoadGroup = false;
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}
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void
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imgRequestProxy::MoveToBackgroundInLoadGroup()
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{
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/* Even if we are still in the load group, we may have taken away the load
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group reference itself because we are in the process of leaving the group.
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In that case, there is no need to background the request. */
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if (!mLoadGroup) {
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return;
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}
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/* There is no need to dispatch if we only need to add ourselves to the load
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group without removal. It is the removal which causes the problematic
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callbacks (see RemoveFromLoadGroup). */
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if (mIsInLoadGroup && mForceDispatchLoadGroup) {
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LOG_FUNC(gImgLog, "imgRequestProxy::MoveToBackgroundInLoadGroup -- dispatch");
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RefPtr<imgRequestProxy> self(this);
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DispatchWithTargetIfAvailable(NS_NewRunnableFunction(
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"imgRequestProxy::MoveToBackgroundInLoadGroup",
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[self]() -> void {
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self->MoveToBackgroundInLoadGroup();
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}));
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return;
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}
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LOG_FUNC(gImgLog, "imgRequestProxy::MoveToBackgroundInLoadGroup");
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nsCOMPtr<imgIRequest> kungFuDeathGrip(this);
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if (mIsInLoadGroup) {
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mLoadGroup->RemoveRequest(this, nullptr, NS_OK);
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}
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mLoadFlags |= nsIRequest::LOAD_BACKGROUND;
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mLoadGroup->AddRequest(this, nullptr);
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}
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/** nsIRequest / imgIRequest methods **/
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NS_IMETHODIMP
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imgRequestProxy::GetName(nsACString& aName)
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{
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aName.Truncate();
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if (mURI) {
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mURI->GetSpec(aName);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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imgRequestProxy::IsPending(bool* _retval)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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imgRequestProxy::GetStatus(nsresult* aStatus)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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imgRequestProxy::Cancel(nsresult status)
|
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{
|
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if (mCanceled) {
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return NS_ERROR_FAILURE;
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}
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LOG_SCOPE(gImgLog, "imgRequestProxy::Cancel");
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mCanceled = true;
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nsCOMPtr<nsIRunnable> ev = new imgCancelRunnable(this, status);
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return DispatchWithTargetIfAvailable(ev.forget());
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}
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void
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imgRequestProxy::DoCancel(nsresult status)
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{
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if (GetOwner()) {
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GetOwner()->RemoveProxy(this, status);
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}
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RemoveFromLoadGroup();
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NullOutListener();
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}
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NS_IMETHODIMP
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imgRequestProxy::CancelAndForgetObserver(nsresult aStatus)
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{
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// If mCanceled is true but mListener is non-null, that means
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// someone called Cancel() on us but the imgCancelRunnable is still
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// pending. We still need to null out mListener before returning
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// from this function in this case. That means we want to do the
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// RemoveProxy call right now, because we need to deliver the
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// onStopRequest.
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if (mCanceled && !mListener) {
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return NS_ERROR_FAILURE;
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|
}
|
|
|
|
LOG_SCOPE(gImgLog, "imgRequestProxy::CancelAndForgetObserver");
|
|
|
|
mCanceled = true;
|
|
mForceDispatchLoadGroup = true;
|
|
|
|
imgRequest* owner = GetOwner();
|
|
if (owner) {
|
|
imgCacheValidator* validator = owner->GetValidator();
|
|
if (validator) {
|
|
validator->RemoveProxy(this);
|
|
}
|
|
|
|
owner->RemoveProxy(this, aStatus);
|
|
}
|
|
|
|
RemoveFromLoadGroup();
|
|
mForceDispatchLoadGroup = false;
|
|
|
|
NullOutListener();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::StartDecoding(uint32_t aFlags)
|
|
{
|
|
// Flag this, so we know to transfer the request if our owner changes
|
|
mDecodeRequested = true;
|
|
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
return image->StartDecoding(aFlags);
|
|
}
|
|
|
|
if (GetOwner()) {
|
|
GetOwner()->StartDecoding();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
bool
|
|
imgRequestProxy::StartDecodingWithResult(uint32_t aFlags)
|
|
{
|
|
// Flag this, so we know to transfer the request if our owner changes
|
|
mDecodeRequested = true;
|
|
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
return image->StartDecodingWithResult(aFlags);
|
|
}
|
|
|
|
if (GetOwner()) {
|
|
GetOwner()->StartDecoding();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::LockImage()
|
|
{
|
|
mLockCount++;
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
return image->LockImage();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::UnlockImage()
|
|
{
|
|
MOZ_ASSERT(mLockCount > 0, "calling unlock but no locks!");
|
|
|
|
mLockCount--;
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
return image->UnlockImage();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::RequestDiscard()
|
|
{
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
return image->RequestDiscard();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::IncrementAnimationConsumers()
|
|
{
|
|
mAnimationConsumers++;
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
image->IncrementAnimationConsumers();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::DecrementAnimationConsumers()
|
|
{
|
|
// We may get here if some responsible code called Increment,
|
|
// then called us, but we have meanwhile called ClearAnimationConsumers
|
|
// because we needed to get rid of them earlier (see
|
|
// imgRequest::RemoveProxy), and hence have nothing left to
|
|
// decrement. (In such a case we got rid of the animation consumers
|
|
// early, but not the observer.)
|
|
if (mAnimationConsumers > 0) {
|
|
mAnimationConsumers--;
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
image->DecrementAnimationConsumers();
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::ClearAnimationConsumers()
|
|
{
|
|
while (mAnimationConsumers > 0) {
|
|
DecrementAnimationConsumers();
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::Suspend()
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::Resume()
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetLoadGroup(nsILoadGroup** loadGroup)
|
|
{
|
|
NS_IF_ADDREF(*loadGroup = mLoadGroup.get());
|
|
return NS_OK;
|
|
}
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::SetLoadGroup(nsILoadGroup* loadGroup)
|
|
{
|
|
if (loadGroup != mLoadGroup) {
|
|
MOZ_ASSERT_UNREACHABLE("Switching load groups is unsupported!");
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetLoadFlags(nsLoadFlags* flags)
|
|
{
|
|
*flags = mLoadFlags;
|
|
return NS_OK;
|
|
}
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::SetLoadFlags(nsLoadFlags flags)
|
|
{
|
|
mLoadFlags = flags;
|
|
return NS_OK;
|
|
}
|
|
|
|
/** imgIRequest methods **/
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetImage(imgIContainer** aImage)
|
|
{
|
|
NS_ENSURE_TRUE(aImage, NS_ERROR_NULL_POINTER);
|
|
// It's possible that our owner has an image but hasn't notified us of it -
|
|
// that'll happen if we get Canceled before the owner instantiates its image
|
|
// (because Canceling unregisters us as a listener on mOwner). If we're
|
|
// in that situation, just grab the image off of mOwner.
|
|
RefPtr<Image> image = GetImage();
|
|
nsCOMPtr<imgIContainer> imageToReturn;
|
|
if (image) {
|
|
imageToReturn = do_QueryInterface(image);
|
|
}
|
|
if (!imageToReturn && GetOwner()) {
|
|
imageToReturn = GetOwner()->GetImage();
|
|
}
|
|
if (!imageToReturn) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
imageToReturn.swap(*aImage);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetImageStatus(uint32_t* aStatus)
|
|
{
|
|
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
|
|
*aStatus = progressTracker->GetImageStatus();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetImageErrorCode(nsresult* aStatus)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
*aStatus = GetOwner()->GetImageErrorCode();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetURI(nsIURI** aURI)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread to convert URI");
|
|
nsCOMPtr<nsIURI> uri = mURI->ToIURI();
|
|
uri.forget(aURI);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
imgRequestProxy::GetFinalURI(nsIURI** aURI)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
return GetOwner()->GetFinalURI(aURI);
|
|
}
|
|
|
|
nsresult
|
|
imgRequestProxy::GetURI(ImageURL** aURI)
|
|
{
|
|
if (!mURI) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
NS_ADDREF(*aURI = mURI);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetNotificationObserver(imgINotificationObserver** aObserver)
|
|
{
|
|
*aObserver = mListener;
|
|
NS_IF_ADDREF(*aObserver);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetMimeType(char** aMimeType)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
const char* type = GetOwner()->GetMimeType();
|
|
if (!type) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
*aMimeType = NS_strdup(type);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
imgRequestProxy* imgRequestProxy::NewClonedProxy()
|
|
{
|
|
return new imgRequestProxy();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::Clone(imgINotificationObserver* aObserver,
|
|
imgIRequest** aClone)
|
|
{
|
|
nsresult result;
|
|
imgRequestProxy* proxy;
|
|
result = PerformClone(aObserver, nullptr, /* aSyncNotify */ true, &proxy);
|
|
*aClone = proxy;
|
|
return result;
|
|
}
|
|
|
|
nsresult imgRequestProxy::SyncClone(imgINotificationObserver* aObserver,
|
|
nsIDocument* aLoadingDocument,
|
|
imgRequestProxy** aClone)
|
|
{
|
|
return PerformClone(aObserver, aLoadingDocument,
|
|
/* aSyncNotify */ true, aClone);
|
|
}
|
|
|
|
nsresult imgRequestProxy::Clone(imgINotificationObserver* aObserver,
|
|
nsIDocument* aLoadingDocument,
|
|
imgRequestProxy** aClone)
|
|
{
|
|
return PerformClone(aObserver, aLoadingDocument,
|
|
/* aSyncNotify */ false, aClone);
|
|
}
|
|
|
|
nsresult
|
|
imgRequestProxy::PerformClone(imgINotificationObserver* aObserver,
|
|
nsIDocument* aLoadingDocument,
|
|
bool aSyncNotify,
|
|
imgRequestProxy** aClone)
|
|
{
|
|
NS_PRECONDITION(aClone, "Null out param");
|
|
|
|
LOG_SCOPE(gImgLog, "imgRequestProxy::Clone");
|
|
|
|
*aClone = nullptr;
|
|
RefPtr<imgRequestProxy> clone = NewClonedProxy();
|
|
|
|
nsCOMPtr<nsILoadGroup> loadGroup;
|
|
if (aLoadingDocument) {
|
|
loadGroup = aLoadingDocument->GetDocumentLoadGroup();
|
|
}
|
|
|
|
// It is important to call |SetLoadFlags()| before calling |Init()| because
|
|
// |Init()| adds the request to the loadgroup.
|
|
// When a request is added to a loadgroup, its load flags are merged
|
|
// with the load flags of the loadgroup.
|
|
// XXXldb That's not true anymore. Stuff from imgLoader adds the
|
|
// request to the loadgroup.
|
|
clone->SetLoadFlags(mLoadFlags);
|
|
nsresult rv = clone->Init(mBehaviour->GetOwner(), loadGroup,
|
|
aLoadingDocument, mURI, aObserver);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
|
|
// Assign to *aClone before calling Notify so that if the caller expects to
|
|
// only be notified for requests it's already holding pointers to it won't be
|
|
// surprised.
|
|
NS_ADDREF(*aClone = clone);
|
|
|
|
if (GetOwner() && GetOwner()->GetValidator()) {
|
|
// Note that if we have a validator, we don't want to issue notifications at
|
|
// here because we want to defer until that completes. AddProxy will add us
|
|
// to the load group; we cannot avoid that in this case, because we don't
|
|
// know when the validation will complete, and if it will cause us to
|
|
// discard our cached state anyways. We are probably already blocked by the
|
|
// original LoadImage(WithChannel) request in any event.
|
|
clone->SetNotificationsDeferred(true);
|
|
GetOwner()->GetValidator()->AddProxy(clone);
|
|
} else {
|
|
// We only want to add the request to the load group of the owning document
|
|
// if it is still in progress. Some callers cannot handle a supurious load
|
|
// group removal (e.g. print preview) so we must be careful. On the other
|
|
// hand, if after cloning, the original request proxy is cancelled /
|
|
// destroyed, we need to ensure that any clones still block the load group
|
|
// if it is incomplete.
|
|
bool addToLoadGroup = mIsInLoadGroup;
|
|
if (!addToLoadGroup) {
|
|
RefPtr<ProgressTracker> tracker = clone->GetProgressTracker();
|
|
addToLoadGroup = tracker && !(tracker->GetProgress() & FLAG_LOAD_COMPLETE);
|
|
}
|
|
|
|
if (addToLoadGroup) {
|
|
clone->AddToLoadGroup();
|
|
}
|
|
|
|
if (aSyncNotify) {
|
|
// This is wrong!!! We need to notify asynchronously, but there's code
|
|
// that assumes that we don't. This will be fixed in bug 580466. Note that
|
|
// if we have a validator, we won't issue notifications anyways because
|
|
// they are deferred, so there is no point in requesting.
|
|
clone->mForceDispatchLoadGroup = true;
|
|
clone->SyncNotifyListener();
|
|
clone->mForceDispatchLoadGroup = false;
|
|
} else {
|
|
// Without a validator, we can request asynchronous notifications
|
|
// immediately. If there was a validator, this would override the deferral
|
|
// and that would be incorrect.
|
|
clone->NotifyListener();
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetImagePrincipal(nsIPrincipal** aPrincipal)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
nsCOMPtr<nsIPrincipal> principal = GetOwner()->GetPrincipal();
|
|
principal.forget(aPrincipal);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetMultipart(bool* aMultipart)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
*aMultipart = GetOwner()->GetMultipart();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetCORSMode(int32_t* aCorsMode)
|
|
{
|
|
if (!GetOwner()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
*aCorsMode = GetOwner()->GetCORSMode();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::BoostPriority(uint32_t aCategory)
|
|
{
|
|
NS_ENSURE_STATE(GetOwner() && !mCanceled);
|
|
GetOwner()->BoostPriority(aCategory);
|
|
return NS_OK;
|
|
}
|
|
|
|
/** nsISupportsPriority methods **/
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetPriority(int32_t* priority)
|
|
{
|
|
NS_ENSURE_STATE(GetOwner());
|
|
*priority = GetOwner()->Priority();
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::SetPriority(int32_t priority)
|
|
{
|
|
NS_ENSURE_STATE(GetOwner() && !mCanceled);
|
|
GetOwner()->AdjustPriority(this, priority - GetOwner()->Priority());
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::AdjustPriority(int32_t priority)
|
|
{
|
|
// We don't require |!mCanceled| here. This may be called even if we're
|
|
// cancelled, because it's invoked as part of the process of removing an image
|
|
// from the load group.
|
|
NS_ENSURE_STATE(GetOwner());
|
|
GetOwner()->AdjustPriority(this, priority);
|
|
return NS_OK;
|
|
}
|
|
|
|
/** nsISecurityInfoProvider methods **/
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetSecurityInfo(nsISupports** _retval)
|
|
{
|
|
if (GetOwner()) {
|
|
return GetOwner()->GetSecurityInfo(_retval);
|
|
}
|
|
|
|
*_retval = nullptr;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetHasTransferredData(bool* hasData)
|
|
{
|
|
if (GetOwner()) {
|
|
*hasData = GetOwner()->HasTransferredData();
|
|
} else {
|
|
// The safe thing to do is to claim we have data
|
|
*hasData = true;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
static const char*
|
|
NotificationTypeToString(int32_t aType)
|
|
{
|
|
switch(aType)
|
|
{
|
|
case imgINotificationObserver::SIZE_AVAILABLE: return "SIZE_AVAILABLE";
|
|
case imgINotificationObserver::FRAME_UPDATE: return "FRAME_UPDATE";
|
|
case imgINotificationObserver::FRAME_COMPLETE: return "FRAME_COMPLETE";
|
|
case imgINotificationObserver::LOAD_COMPLETE: return "LOAD_COMPLETE";
|
|
case imgINotificationObserver::DECODE_COMPLETE: return "DECODE_COMPLETE";
|
|
case imgINotificationObserver::DISCARD: return "DISCARD";
|
|
case imgINotificationObserver::UNLOCKED_DRAW: return "UNLOCKED_DRAW";
|
|
case imgINotificationObserver::IS_ANIMATED: return "IS_ANIMATED";
|
|
case imgINotificationObserver::HAS_TRANSPARENCY: return "HAS_TRANSPARENCY";
|
|
default:
|
|
NS_NOTREACHED("Notification list should be exhaustive");
|
|
return "(unknown notification)";
|
|
}
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::Notify(int32_t aType, const mozilla::gfx::IntRect* aRect)
|
|
{
|
|
MOZ_ASSERT(aType != imgINotificationObserver::LOAD_COMPLETE,
|
|
"Should call OnLoadComplete");
|
|
|
|
LOG_FUNC_WITH_PARAM(gImgLog, "imgRequestProxy::Notify", "type",
|
|
NotificationTypeToString(aType));
|
|
|
|
if (!mListener || mCanceled) {
|
|
return;
|
|
}
|
|
|
|
if (!IsOnEventTarget()) {
|
|
RefPtr<imgRequestProxy> self(this);
|
|
if (aRect) {
|
|
const mozilla::gfx::IntRect rect = *aRect;
|
|
DispatchWithTarget(NS_NewRunnableFunction("imgRequestProxy::Notify",
|
|
[self, rect, aType]() -> void {
|
|
self->Notify(aType, &rect);
|
|
}));
|
|
} else {
|
|
DispatchWithTarget(NS_NewRunnableFunction("imgRequestProxy::Notify",
|
|
[self, aType]() -> void {
|
|
self->Notify(aType, nullptr);
|
|
}));
|
|
}
|
|
return;
|
|
}
|
|
|
|
// Make sure the listener stays alive while we notify.
|
|
nsCOMPtr<imgINotificationObserver> listener(mListener);
|
|
|
|
listener->Notify(this, aType, aRect);
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::OnLoadComplete(bool aLastPart)
|
|
{
|
|
if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) {
|
|
nsAutoCString name;
|
|
GetName(name);
|
|
LOG_FUNC_WITH_PARAM(gImgLog, "imgRequestProxy::OnLoadComplete",
|
|
"name", name.get());
|
|
}
|
|
|
|
// There's all sorts of stuff here that could kill us (the OnStopRequest call
|
|
// on the listener, the removal from the loadgroup, the release of the
|
|
// listener, etc). Don't let them do it.
|
|
RefPtr<imgRequestProxy> self(this);
|
|
|
|
if (!IsOnEventTarget()) {
|
|
DispatchWithTarget(NS_NewRunnableFunction("imgRequestProxy::OnLoadComplete",
|
|
[self, aLastPart]() -> void {
|
|
self->OnLoadComplete(aLastPart);
|
|
}));
|
|
return;
|
|
}
|
|
|
|
if (mListener && !mCanceled) {
|
|
// Hold a ref to the listener while we call it, just in case.
|
|
nsCOMPtr<imgINotificationObserver> listener(mListener);
|
|
listener->Notify(this, imgINotificationObserver::LOAD_COMPLETE, nullptr);
|
|
}
|
|
|
|
// If we're expecting more data from a multipart channel, re-add ourself
|
|
// to the loadgroup so that the document doesn't lose track of the load.
|
|
// If the request is already a background request and there's more data
|
|
// coming, we can just leave the request in the loadgroup as-is.
|
|
if (aLastPart || (mLoadFlags & nsIRequest::LOAD_BACKGROUND) == 0) {
|
|
if (aLastPart) {
|
|
RemoveFromLoadGroup();
|
|
} else {
|
|
// More data is coming, so change the request to be a background request
|
|
// and put it back in the loadgroup.
|
|
MoveToBackgroundInLoadGroup();
|
|
}
|
|
}
|
|
|
|
if (mListenerIsStrongRef && aLastPart) {
|
|
NS_PRECONDITION(mListener, "How did that happen?");
|
|
// Drop our strong ref to the listener now that we're done with
|
|
// everything. Note that this can cancel us and other fun things
|
|
// like that. Don't add anything in this method after this point.
|
|
imgINotificationObserver* obs = mListener;
|
|
mListenerIsStrongRef = false;
|
|
NS_RELEASE(obs);
|
|
}
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::NullOutListener()
|
|
{
|
|
// If we have animation consumers, then they don't matter anymore
|
|
if (mListener) {
|
|
ClearAnimationConsumers();
|
|
}
|
|
|
|
if (mListenerIsStrongRef) {
|
|
// Releasing could do weird reentery stuff, so just play it super-safe
|
|
nsCOMPtr<imgINotificationObserver> obs;
|
|
obs.swap(mListener);
|
|
mListenerIsStrongRef = false;
|
|
} else {
|
|
mListener = nullptr;
|
|
}
|
|
|
|
// Note that we don't free the event target. We actually need that to ensure
|
|
// we get removed from the ProgressTracker properly. No harm in keeping it
|
|
// however.
|
|
mTabGroup = nullptr;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxy::GetStaticRequest(imgIRequest** aReturn)
|
|
{
|
|
imgRequestProxy* proxy;
|
|
nsresult result = GetStaticRequest(nullptr, &proxy);
|
|
*aReturn = proxy;
|
|
return result;
|
|
}
|
|
|
|
nsresult
|
|
imgRequestProxy::GetStaticRequest(nsIDocument* aLoadingDocument,
|
|
imgRequestProxy** aReturn)
|
|
{
|
|
*aReturn = nullptr;
|
|
RefPtr<Image> image = GetImage();
|
|
|
|
bool animated;
|
|
if (!image || (NS_SUCCEEDED(image->GetAnimated(&animated)) && !animated)) {
|
|
// Early exit - we're not animated, so we don't have to do anything.
|
|
NS_ADDREF(*aReturn = this);
|
|
return NS_OK;
|
|
}
|
|
|
|
// Check for errors in the image. Callers code rely on GetStaticRequest
|
|
// failing in this case, though with FrozenImage there's no technical reason
|
|
// for it anymore.
|
|
if (image->HasError()) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// We are animated. We need to create a frozen version of this image.
|
|
RefPtr<Image> frozenImage = ImageOps::Freeze(image);
|
|
|
|
// Create a static imgRequestProxy with our new extracted frame.
|
|
nsCOMPtr<nsIPrincipal> currentPrincipal;
|
|
GetImagePrincipal(getter_AddRefs(currentPrincipal));
|
|
RefPtr<imgRequestProxy> req = new imgRequestProxyStatic(frozenImage,
|
|
currentPrincipal);
|
|
req->Init(nullptr, nullptr, aLoadingDocument, mURI, nullptr);
|
|
|
|
NS_ADDREF(*aReturn = req);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::NotifyListener()
|
|
{
|
|
// It would be nice to notify the observer directly in the status tracker
|
|
// instead of through the proxy, but there are several places we do extra
|
|
// processing when we receive notifications (like OnStopRequest()), and we
|
|
// need to check mCanceled everywhere too.
|
|
|
|
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
|
|
if (GetOwner()) {
|
|
// Send the notifications to our listener asynchronously.
|
|
progressTracker->Notify(this);
|
|
} else {
|
|
// We don't have an imgRequest, so we can only notify the clone of our
|
|
// current state, but we still have to do that asynchronously.
|
|
MOZ_ASSERT(HasImage(),
|
|
"if we have no imgRequest, we should have an Image");
|
|
progressTracker->NotifyCurrentState(this);
|
|
}
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::SyncNotifyListener()
|
|
{
|
|
// It would be nice to notify the observer directly in the status tracker
|
|
// instead of through the proxy, but there are several places we do extra
|
|
// processing when we receive notifications (like OnStopRequest()), and we
|
|
// need to check mCanceled everywhere too.
|
|
|
|
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
|
|
progressTracker->SyncNotify(this);
|
|
}
|
|
|
|
void
|
|
imgRequestProxy::SetHasImage()
|
|
{
|
|
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
|
|
MOZ_ASSERT(progressTracker);
|
|
RefPtr<Image> image = progressTracker->GetImage();
|
|
MOZ_ASSERT(image);
|
|
|
|
// Force any private status related to the owner to reflect
|
|
// the presence of an image;
|
|
mBehaviour->SetOwner(mBehaviour->GetOwner());
|
|
|
|
// Apply any locks we have
|
|
for (uint32_t i = 0; i < mLockCount; ++i) {
|
|
image->LockImage();
|
|
}
|
|
|
|
// Apply any animation consumers we have
|
|
for (uint32_t i = 0; i < mAnimationConsumers; i++) {
|
|
image->IncrementAnimationConsumers();
|
|
}
|
|
}
|
|
|
|
already_AddRefed<ProgressTracker>
|
|
imgRequestProxy::GetProgressTracker() const
|
|
{
|
|
return mBehaviour->GetProgressTracker();
|
|
}
|
|
|
|
already_AddRefed<mozilla::image::Image>
|
|
imgRequestProxy::GetImage() const
|
|
{
|
|
return mBehaviour->GetImage();
|
|
}
|
|
|
|
bool
|
|
RequestBehaviour::HasImage() const
|
|
{
|
|
if (!mOwnerHasImage) {
|
|
return false;
|
|
}
|
|
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
|
|
return progressTracker ? progressTracker->HasImage() : false;
|
|
}
|
|
|
|
bool
|
|
imgRequestProxy::HasImage() const
|
|
{
|
|
return mBehaviour->HasImage();
|
|
}
|
|
|
|
imgRequest*
|
|
imgRequestProxy::GetOwner() const
|
|
{
|
|
return mBehaviour->GetOwner();
|
|
}
|
|
|
|
////////////////// imgRequestProxyStatic methods
|
|
|
|
class StaticBehaviour : public ProxyBehaviour
|
|
{
|
|
public:
|
|
explicit StaticBehaviour(mozilla::image::Image* aImage) : mImage(aImage) {}
|
|
|
|
already_AddRefed<mozilla::image::Image>
|
|
GetImage() const override {
|
|
RefPtr<mozilla::image::Image> image = mImage;
|
|
return image.forget();
|
|
}
|
|
|
|
bool HasImage() const override {
|
|
return mImage;
|
|
}
|
|
|
|
already_AddRefed<ProgressTracker> GetProgressTracker()
|
|
const override {
|
|
return mImage->GetProgressTracker();
|
|
}
|
|
|
|
imgRequest* GetOwner() const override {
|
|
return nullptr;
|
|
}
|
|
|
|
void SetOwner(imgRequest* aOwner) override {
|
|
MOZ_ASSERT(!aOwner,
|
|
"We shouldn't be giving static requests a non-null owner.");
|
|
}
|
|
|
|
private:
|
|
// Our image. We have to hold a strong reference here, because that's normally
|
|
// the job of the underlying request.
|
|
RefPtr<mozilla::image::Image> mImage;
|
|
};
|
|
|
|
imgRequestProxyStatic::imgRequestProxyStatic(mozilla::image::Image* aImage,
|
|
nsIPrincipal* aPrincipal)
|
|
: mPrincipal(aPrincipal)
|
|
{
|
|
mBehaviour = mozilla::MakeUnique<StaticBehaviour>(aImage);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
imgRequestProxyStatic::GetImagePrincipal(nsIPrincipal** aPrincipal)
|
|
{
|
|
if (!mPrincipal) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
NS_ADDREF(*aPrincipal = mPrincipal);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
imgRequestProxy* imgRequestProxyStatic::NewClonedProxy()
|
|
{
|
|
nsCOMPtr<nsIPrincipal> currentPrincipal;
|
|
GetImagePrincipal(getter_AddRefs(currentPrincipal));
|
|
RefPtr<mozilla::image::Image> image = GetImage();
|
|
return new imgRequestProxyStatic(image, currentPrincipal);
|
|
}
|