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d0d070b48c
MozReview-Commit-ID: JNYZsts6pCO --HG-- extra : rebase_source : d37ce77ec84af302018f95285cff61b2ba28c957
605 lines
18 KiB
C++
605 lines
18 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 "ImageLogging.h"
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#include "ProgressTracker.h"
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#include "imgIContainer.h"
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#include "imgINotificationObserver.h"
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#include "imgIRequest.h"
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#include "Image.h"
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#include "nsNetUtil.h"
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#include "nsIObserverService.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Services.h"
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#include "mozilla/SystemGroup.h"
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using mozilla::WeakPtr;
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namespace mozilla {
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namespace image {
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static void
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CheckProgressConsistency(Progress aOldProgress, Progress aNewProgress, bool aIsMultipart)
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{
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// Check preconditions for every progress bit.
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// Error's do not get propagated from the tracker for each image part to the
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// tracker for the multipart image because we don't want one bad part to
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// prevent the remaining parts from showing. So we need to consider whether
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// this is a tracker for a multipart image for these assertions to work.
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if (aNewProgress & FLAG_SIZE_AVAILABLE) {
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// No preconditions.
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}
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if (aNewProgress & FLAG_DECODE_COMPLETE) {
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MOZ_ASSERT(aNewProgress & FLAG_SIZE_AVAILABLE);
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MOZ_ASSERT(aIsMultipart || aNewProgress & (FLAG_FRAME_COMPLETE | FLAG_HAS_ERROR));
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}
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if (aNewProgress & FLAG_FRAME_COMPLETE) {
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MOZ_ASSERT(aNewProgress & FLAG_SIZE_AVAILABLE);
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}
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if (aNewProgress & FLAG_LOAD_COMPLETE) {
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MOZ_ASSERT(aIsMultipart || aNewProgress & (FLAG_SIZE_AVAILABLE | FLAG_HAS_ERROR));
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}
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if (aNewProgress & FLAG_IS_ANIMATED) {
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// No preconditions; like FLAG_HAS_TRANSPARENCY, we should normally never
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// discover this *after* FLAG_SIZE_AVAILABLE, but unfortunately some corrupt
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// GIFs may fool us.
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}
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if (aNewProgress & FLAG_HAS_TRANSPARENCY) {
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// XXX We'd like to assert that transparency is only set during metadata
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// decode but we don't have any way to assert that until bug 1254892 is fixed.
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}
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if (aNewProgress & FLAG_LAST_PART_COMPLETE) {
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MOZ_ASSERT(aNewProgress & FLAG_LOAD_COMPLETE);
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}
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if (aNewProgress & FLAG_HAS_ERROR) {
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// No preconditions.
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}
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}
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ProgressTracker::ProgressTracker()
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: mMutex("ProgressTracker::mMutex")
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, mImage(nullptr)
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, mEventTarget(WrapNotNull(nsCOMPtr<nsIEventTarget>(SystemGroup::EventTargetFor(TaskCategory::Other))))
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, mObserversWithTargets(0)
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, mObservers(new ObserverTable)
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, mProgress(NoProgress)
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, mIsMultipart(false)
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{ }
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void
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ProgressTracker::SetImage(Image* aImage)
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{
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MutexAutoLock lock(mMutex);
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MOZ_ASSERT(aImage, "Setting null image");
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MOZ_ASSERT(!mImage, "Setting image when we already have one");
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mImage = aImage;
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}
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void
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ProgressTracker::ResetImage()
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{
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MutexAutoLock lock(mMutex);
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MOZ_ASSERT(mImage, "Resetting image when it's already null!");
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mImage = nullptr;
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}
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uint32_t
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ProgressTracker::GetImageStatus() const
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{
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uint32_t status = imgIRequest::STATUS_NONE;
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// Translate our current state to a set of imgIRequest::STATE_* flags.
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if (mProgress & FLAG_SIZE_AVAILABLE) {
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status |= imgIRequest::STATUS_SIZE_AVAILABLE;
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}
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if (mProgress & FLAG_DECODE_COMPLETE) {
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status |= imgIRequest::STATUS_DECODE_COMPLETE;
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}
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if (mProgress & FLAG_FRAME_COMPLETE) {
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status |= imgIRequest::STATUS_FRAME_COMPLETE;
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}
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if (mProgress & FLAG_LOAD_COMPLETE) {
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status |= imgIRequest::STATUS_LOAD_COMPLETE;
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}
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if (mProgress & FLAG_IS_ANIMATED) {
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status |= imgIRequest::STATUS_IS_ANIMATED;
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}
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if (mProgress & FLAG_HAS_TRANSPARENCY) {
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status |= imgIRequest::STATUS_HAS_TRANSPARENCY;
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}
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if (mProgress & FLAG_HAS_ERROR) {
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status |= imgIRequest::STATUS_ERROR;
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}
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return status;
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}
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// A helper class to allow us to call SyncNotify asynchronously.
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class AsyncNotifyRunnable : public Runnable
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{
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public:
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AsyncNotifyRunnable(ProgressTracker* aTracker,
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IProgressObserver* aObserver)
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: Runnable("ProgressTracker::AsyncNotifyRunnable")
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, mTracker(aTracker)
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be created on the main thread");
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MOZ_ASSERT(aTracker, "aTracker should not be null");
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MOZ_ASSERT(aObserver, "aObserver should not be null");
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mObservers.AppendElement(aObserver);
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}
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NS_IMETHOD Run() override
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be running on the main thread");
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MOZ_ASSERT(mTracker, "mTracker should not be null");
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for (uint32_t i = 0; i < mObservers.Length(); ++i) {
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mObservers[i]->SetNotificationsDeferred(false);
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mTracker->SyncNotify(mObservers[i]);
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}
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mTracker->mRunnable = nullptr;
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return NS_OK;
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}
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void AddObserver(IProgressObserver* aObserver)
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{
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mObservers.AppendElement(aObserver);
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}
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void RemoveObserver(IProgressObserver* aObserver)
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{
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mObservers.RemoveElement(aObserver);
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}
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private:
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friend class ProgressTracker;
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RefPtr<ProgressTracker> mTracker;
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nsTArray<RefPtr<IProgressObserver>> mObservers;
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};
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void
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ProgressTracker::Notify(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) {
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RefPtr<Image> image = GetImage();
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if (image && image->GetURI()) {
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RefPtr<ImageURL> uri(image->GetURI());
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nsAutoCString spec;
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uri->GetSpec(spec);
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LOG_FUNC_WITH_PARAM(gImgLog,
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"ProgressTracker::Notify async", "uri", spec.get());
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} else {
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LOG_FUNC_WITH_PARAM(gImgLog,
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"ProgressTracker::Notify async", "uri", "<unknown>");
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}
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}
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aObserver->SetNotificationsDeferred(true);
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// If we have an existing runnable that we can use, we just append this
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// observer to its list of observers to be notified. This ensures we don't
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// unnecessarily delay onload.
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AsyncNotifyRunnable* runnable =
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static_cast<AsyncNotifyRunnable*>(mRunnable.get());
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if (runnable) {
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runnable->AddObserver(aObserver);
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} else {
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mRunnable = new AsyncNotifyRunnable(this, aObserver);
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mEventTarget->Dispatch(mRunnable, NS_DISPATCH_NORMAL);
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}
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}
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// A helper class to allow us to call SyncNotify asynchronously for a given,
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// fixed, state.
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class AsyncNotifyCurrentStateRunnable : public Runnable
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{
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public:
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AsyncNotifyCurrentStateRunnable(ProgressTracker* aProgressTracker,
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IProgressObserver* aObserver)
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: Runnable("image::AsyncNotifyCurrentStateRunnable")
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, mProgressTracker(aProgressTracker)
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, mObserver(aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be created on the main thread");
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MOZ_ASSERT(mProgressTracker, "mProgressTracker should not be null");
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MOZ_ASSERT(mObserver, "mObserver should not be null");
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mImage = mProgressTracker->GetImage();
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}
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NS_IMETHOD Run() override
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be running on the main thread");
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mObserver->SetNotificationsDeferred(false);
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mProgressTracker->SyncNotify(mObserver);
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return NS_OK;
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}
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private:
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RefPtr<ProgressTracker> mProgressTracker;
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RefPtr<IProgressObserver> mObserver;
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// We have to hold on to a reference to the tracker's image, just in case
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// it goes away while we're in the event queue.
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RefPtr<Image> mImage;
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};
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void
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ProgressTracker::NotifyCurrentState(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) {
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RefPtr<Image> image = GetImage();
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nsAutoCString spec;
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if (image && image->GetURI()) {
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image->GetURI()->GetSpec(spec);
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}
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LOG_FUNC_WITH_PARAM(gImgLog,
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"ProgressTracker::NotifyCurrentState", "uri", spec.get());
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}
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aObserver->SetNotificationsDeferred(true);
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nsCOMPtr<nsIRunnable> ev = new AsyncNotifyCurrentStateRunnable(this,
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aObserver);
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mEventTarget->Dispatch(ev.forget(), NS_DISPATCH_NORMAL);
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}
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/**
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* ImageObserverNotifier is a helper type that abstracts over the difference
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* between sending notifications to all of the observers in an ObserverTable,
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* and sending them to a single observer. This allows the same notification code
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* to be used for both cases.
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*/
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template <typename T> struct ImageObserverNotifier;
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template <>
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struct MOZ_STACK_CLASS ImageObserverNotifier<const ObserverTable*>
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{
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explicit ImageObserverNotifier(const ObserverTable* aObservers,
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bool aIgnoreDeferral = false)
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: mObservers(aObservers)
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, mIgnoreDeferral(aIgnoreDeferral)
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{ }
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template <typename Lambda>
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void operator()(Lambda aFunc)
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{
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for (auto iter = mObservers->ConstIter(); !iter.Done(); iter.Next()) {
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RefPtr<IProgressObserver> observer = iter.Data().get();
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if (observer &&
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(mIgnoreDeferral || !observer->NotificationsDeferred())) {
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aFunc(observer);
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}
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}
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}
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private:
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const ObserverTable* mObservers;
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const bool mIgnoreDeferral;
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};
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template <>
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struct MOZ_STACK_CLASS ImageObserverNotifier<IProgressObserver*>
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{
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explicit ImageObserverNotifier(IProgressObserver* aObserver)
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: mObserver(aObserver)
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{ }
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template <typename Lambda>
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void operator()(Lambda aFunc)
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{
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if (mObserver && !mObserver->NotificationsDeferred()) {
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aFunc(mObserver);
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}
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}
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private:
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IProgressObserver* mObserver;
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};
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template <typename T> void
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SyncNotifyInternal(const T& aObservers,
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bool aHasImage,
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Progress aProgress,
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const nsIntRect& aDirtyRect)
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{
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MOZ_ASSERT(NS_IsMainThread());
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typedef imgINotificationObserver I;
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ImageObserverNotifier<T> notify(aObservers);
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if (aProgress & FLAG_SIZE_AVAILABLE) {
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notify([](IProgressObserver* aObs) { aObs->Notify(I::SIZE_AVAILABLE); });
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}
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if (aHasImage) {
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// OnFrameUpdate
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// If there's any content in this frame at all (always true for
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// vector images, true for raster images that have decoded at
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// least one frame) then send OnFrameUpdate.
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if (!aDirtyRect.IsEmpty()) {
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notify([&](IProgressObserver* aObs) {
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aObs->Notify(I::FRAME_UPDATE, &aDirtyRect);
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});
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}
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if (aProgress & FLAG_FRAME_COMPLETE) {
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notify([](IProgressObserver* aObs) { aObs->Notify(I::FRAME_COMPLETE); });
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}
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if (aProgress & FLAG_HAS_TRANSPARENCY) {
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notify([](IProgressObserver* aObs) { aObs->Notify(I::HAS_TRANSPARENCY); });
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}
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if (aProgress & FLAG_IS_ANIMATED) {
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notify([](IProgressObserver* aObs) { aObs->Notify(I::IS_ANIMATED); });
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}
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}
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if (aProgress & FLAG_DECODE_COMPLETE) {
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MOZ_ASSERT(aHasImage, "Stopped decoding without ever having an image?");
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notify([](IProgressObserver* aObs) { aObs->Notify(I::DECODE_COMPLETE); });
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}
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if (aProgress & FLAG_LOAD_COMPLETE) {
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notify([=](IProgressObserver* aObs) {
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aObs->OnLoadComplete(aProgress & FLAG_LAST_PART_COMPLETE);
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});
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}
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}
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void
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ProgressTracker::SyncNotifyProgress(Progress aProgress,
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const nsIntRect& aInvalidRect
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/* = nsIntRect() */)
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{
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MOZ_ASSERT(NS_IsMainThread(), "Use mObservers on main thread only");
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Progress progress = Difference(aProgress);
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CheckProgressConsistency(mProgress, mProgress | progress, mIsMultipart);
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// Apply the changes.
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mProgress |= progress;
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// Send notifications.
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mObservers.Read([&](const ObserverTable* aTable) {
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SyncNotifyInternal(aTable, HasImage(), progress, aInvalidRect);
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});
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if (progress & FLAG_HAS_ERROR) {
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FireFailureNotification();
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}
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}
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void
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ProgressTracker::SyncNotify(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread());
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RefPtr<Image> image = GetImage();
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nsAutoCString spec;
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if (image && image->GetURI()) {
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image->GetURI()->GetSpec(spec);
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}
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LOG_SCOPE_WITH_PARAM(gImgLog,
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"ProgressTracker::SyncNotify", "uri", spec.get());
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nsIntRect rect;
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if (image) {
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int32_t width, height;
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if (NS_FAILED(image->GetWidth(&width)) ||
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NS_FAILED(image->GetHeight(&height))) {
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// Either the image has no intrinsic size, or it has an error.
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rect = GetMaxSizedIntRect();
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} else {
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rect.SizeTo(width, height);
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}
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}
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SyncNotifyInternal(aObserver, !!image, mProgress, rect);
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}
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void
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ProgressTracker::EmulateRequestFinished(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread(),
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"SyncNotifyState and mObservers are not threadsafe");
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RefPtr<IProgressObserver> kungFuDeathGrip(aObserver);
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if (!(mProgress & FLAG_LOAD_COMPLETE)) {
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aObserver->OnLoadComplete(true);
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}
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}
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already_AddRefed<nsIEventTarget>
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ProgressTracker::GetEventTarget() const
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{
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MutexAutoLock lock(mMutex);
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nsCOMPtr<nsIEventTarget> target = mEventTarget;
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return target.forget();
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}
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void
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ProgressTracker::AddObserver(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread());
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RefPtr<IProgressObserver> observer = aObserver;
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nsCOMPtr<nsIEventTarget> target = observer->GetEventTarget();
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if (target) {
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if (mObserversWithTargets == 0) {
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// On the first observer with a target (i.e. listener), always accept its
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// event target; this may be for a specific DocGroup, or it may be the
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// unlabelled main thread target.
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MutexAutoLock lock(mMutex);
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mEventTarget = WrapNotNull(target);
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} else if (mEventTarget.get() != target.get()) {
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// If a subsequent observer comes in with a different target, we need to
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// switch to use the unlabelled main thread target, if we haven't already.
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MutexAutoLock lock(mMutex);
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nsCOMPtr<nsIEventTarget> mainTarget(do_GetMainThread());
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mEventTarget = WrapNotNull(mainTarget);
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}
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++mObserversWithTargets;
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}
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mObservers.Write([=](ObserverTable* aTable) {
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MOZ_ASSERT(!aTable->Get(observer, nullptr),
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"Adding duplicate entry for image observer");
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WeakPtr<IProgressObserver> weakPtr = observer.get();
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aTable->Put(observer, weakPtr);
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});
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MOZ_ASSERT(mObserversWithTargets <= ObserverCount());
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}
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bool
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ProgressTracker::RemoveObserver(IProgressObserver* aObserver)
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{
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MOZ_ASSERT(NS_IsMainThread());
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RefPtr<IProgressObserver> observer = aObserver;
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// Remove the observer from the list.
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bool removed = mObservers.Write([observer](ObserverTable* aTable) {
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return aTable->Remove(observer);
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});
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// Sometimes once an image is decoded, and all of its observers removed, a new
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// document may request the same image. Thus we need to clear our event target
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// state when the last observer is removed, so that we select the most
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// appropriate event target when a new observer is added. Since the event
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// target may have changed (e.g. due to the scheduler group going away before
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// we were removed), so we should be cautious comparing this target against
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// anything at this stage.
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if (removed) {
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nsCOMPtr<nsIEventTarget> target = observer->GetEventTarget();
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if (target) {
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MOZ_ASSERT(mObserversWithTargets > 0);
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--mObserversWithTargets;
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if (mObserversWithTargets == 0) {
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MutexAutoLock lock(mMutex);
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nsCOMPtr<nsIEventTarget> target(SystemGroup::EventTargetFor(TaskCategory::Other));
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mEventTarget = WrapNotNull(target);
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}
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}
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MOZ_ASSERT(mObserversWithTargets <= ObserverCount());
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}
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// Observers can get confused if they don't get all the proper teardown
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// notifications. Part ways on good terms.
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if (removed && !aObserver->NotificationsDeferred()) {
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EmulateRequestFinished(aObserver);
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}
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// Make sure we don't give callbacks to an observer that isn't interested in
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// them any more.
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AsyncNotifyRunnable* runnable =
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static_cast<AsyncNotifyRunnable*>(mRunnable.get());
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if (aObserver->NotificationsDeferred() && runnable) {
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runnable->RemoveObserver(aObserver);
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|
aObserver->SetNotificationsDeferred(false);
|
|
}
|
|
|
|
return removed;
|
|
}
|
|
|
|
uint32_t
|
|
ProgressTracker::ObserverCount() const
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
return mObservers.Read([](const ObserverTable* aTable) {
|
|
return aTable->Count();
|
|
});
|
|
}
|
|
|
|
void
|
|
ProgressTracker::OnUnlockedDraw()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
mObservers.Read([](const ObserverTable* aTable) {
|
|
ImageObserverNotifier<const ObserverTable*> notify(aTable);
|
|
notify([](IProgressObserver* aObs) {
|
|
aObs->Notify(imgINotificationObserver::UNLOCKED_DRAW);
|
|
});
|
|
});
|
|
}
|
|
|
|
void
|
|
ProgressTracker::ResetForNewRequest()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
mProgress = NoProgress;
|
|
}
|
|
|
|
void
|
|
ProgressTracker::OnDiscard()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
mObservers.Read([](const ObserverTable* aTable) {
|
|
ImageObserverNotifier<const ObserverTable*> notify(aTable);
|
|
notify([](IProgressObserver* aObs) {
|
|
aObs->Notify(imgINotificationObserver::DISCARD);
|
|
});
|
|
});
|
|
}
|
|
|
|
void
|
|
ProgressTracker::OnImageAvailable()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
// Notify any imgRequestProxys that are observing us that we have an Image.
|
|
mObservers.Read([](const ObserverTable* aTable) {
|
|
ImageObserverNotifier<const ObserverTable*>
|
|
notify(aTable, /* aIgnoreDeferral = */ true);
|
|
notify([](IProgressObserver* aObs) {
|
|
aObs->SetHasImage();
|
|
});
|
|
});
|
|
}
|
|
|
|
void
|
|
ProgressTracker::FireFailureNotification()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
|
|
// Some kind of problem has happened with image decoding.
|
|
// Report the URI to net:failed-to-process-uri-conent observers.
|
|
RefPtr<Image> image = GetImage();
|
|
if (image) {
|
|
// Should be on main thread, so ok to create a new nsIURI.
|
|
nsCOMPtr<nsIURI> uri;
|
|
{
|
|
RefPtr<ImageURL> threadsafeUriData = image->GetURI();
|
|
uri = threadsafeUriData ? threadsafeUriData->ToIURI() : nullptr;
|
|
}
|
|
if (uri) {
|
|
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
|
|
if (os) {
|
|
os->NotifyObservers(uri, "net:failed-to-process-uri-content", nullptr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace image
|
|
} // namespace mozilla
|