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diff --git a/layout/base/nsRefreshDriver.cpp b/layout/base/nsRefreshDriver.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Code to notify things that animate before a refresh, at an appropriate
+ * refresh rate. (Perhaps temporary, until replaced by compositor.)
+ *
+ * Chrome and each tab have their own RefreshDriver, which in turn
+ * hooks into one of a few global timer based on RefreshDriverTimer,
+ * defined below. There are two main global timers -- one for active
+ * animations, and one for inactive ones. These are implemented as
+ * subclasses of RefreshDriverTimer; see below for a description of
+ * their implementations. In the future, additional timer types may
+ * implement things like blocking on vsync.
+ */
+
+#include "nsRefreshDriver.h"
+#include "mozilla/DataMutex.h"
+#include "nsThreadUtils.h"
+
+#ifdef XP_WIN
+# include <windows.h>
+// mmsystem isn't part of WIN32_LEAN_AND_MEAN, so we have
+// to manually include it
+# include <mmsystem.h>
+# include "WinUtils.h"
+#endif
+
+#include "mozilla/AnimationEventDispatcher.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/AutoRestore.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/DisplayPortUtils.h"
+#include "mozilla/InputTaskManager.h"
+#include "mozilla/IntegerRange.h"
+#include "mozilla/PresShell.h"
+#include "nsITimer.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsComponentManagerUtils.h"
+#include "mozilla/Logging.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "nsIXULRuntime.h"
+#include "jsapi.h"
+#include "nsContentUtils.h"
+#include "mozilla/PendingAnimationTracker.h"
+#include "mozilla/PendingFullscreenEvent.h"
+#include "mozilla/dom/PerformanceMainThread.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_apz.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/StaticPrefs_idle_period.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_page_load.h"
+#include "nsViewManager.h"
+#include "GeckoProfiler.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/dom/CallbackDebuggerNotification.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/Performance.h"
+#include "mozilla/dom/Selection.h"
+#include "mozilla/dom/VsyncMainChild.h"
+#include "mozilla/dom/WindowBinding.h"
+#include "mozilla/layers/WebRenderLayerManager.h"
+#include "mozilla/RestyleManager.h"
+#include "mozilla/TaskController.h"
+#include "imgIContainer.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "nsDocShell.h"
+#include "nsISimpleEnumerator.h"
+#include "nsJSEnvironment.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Telemetry.h"
+
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "VsyncSource.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "mozilla/Unused.h"
+#include "mozilla/TimelineConsumers.h"
+#include "nsAnimationManager.h"
+#include "nsDisplayList.h"
+#include "nsDOMNavigationTiming.h"
+#include "nsTransitionManager.h"
+
+#if defined(MOZ_WIDGET_ANDROID)
+# include "VRManagerChild.h"
+#endif // defined(MOZ_WIDGET_ANDROID)
+
+#include "nsXULPopupManager.h"
+
+#include <numeric>
+
+using namespace mozilla;
+using namespace mozilla::widget;
+using namespace mozilla::ipc;
+using namespace mozilla::dom;
+using namespace mozilla::layout;
+
+static mozilla::LazyLogModule sRefreshDriverLog("nsRefreshDriver");
+#define LOG(...) \
+ MOZ_LOG(sRefreshDriverLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
+
+// after 10 minutes, stop firing off inactive timers
+#define DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS 600
+
+// The number of seconds spent skipping frames because we are waiting for the
+// compositor before logging.
+#if defined(MOZ_ASAN)
+# define REFRESH_WAIT_WARNING 5
+#elif defined(DEBUG) && !defined(MOZ_VALGRIND)
+# define REFRESH_WAIT_WARNING 5
+#elif defined(DEBUG) && defined(MOZ_VALGRIND)
+# define REFRESH_WAIT_WARNING (RUNNING_ON_VALGRIND ? 20 : 5)
+#elif defined(MOZ_VALGRIND)
+# define REFRESH_WAIT_WARNING (RUNNING_ON_VALGRIND ? 10 : 1)
+#else
+# define REFRESH_WAIT_WARNING 1
+#endif
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(nsRefreshDriver::TickReasons);
+
+namespace {
+// The number outstanding nsRefreshDrivers (that have been created but not
+// disconnected). When this reaches zero we will call
+// nsRefreshDriver::Shutdown.
+static uint32_t sRefreshDriverCount = 0;
+} // namespace
+
+namespace mozilla {
+
+static TimeStamp sMostRecentHighRateVsync;
+
+/*
+ * The base class for all global refresh driver timers. It takes care
+ * of managing the list of refresh drivers attached to them and
+ * provides interfaces for querying/setting the rate and actually
+ * running a timer 'Tick'. Subclasses must implement StartTimer(),
+ * StopTimer(), and ScheduleNextTick() -- the first two just
+ * start/stop whatever timer mechanism is in use, and ScheduleNextTick
+ * is called at the start of the Tick() implementation to set a time
+ * for the next tick.
+ */
+class RefreshDriverTimer {
+ public:
+ RefreshDriverTimer() = default;
+
+ NS_INLINE_DECL_REFCOUNTING(RefreshDriverTimer)
+
+ virtual void AddRefreshDriver(nsRefreshDriver* aDriver) {
+ LOG("[%p] AddRefreshDriver %p", this, aDriver);
+
+ bool startTimer =
+ mContentRefreshDrivers.IsEmpty() && mRootRefreshDrivers.IsEmpty();
+ if (IsRootRefreshDriver(aDriver)) {
+ NS_ASSERTION(!mRootRefreshDrivers.Contains(aDriver),
+ "Adding a duplicate root refresh driver!");
+ mRootRefreshDrivers.AppendElement(aDriver);
+ } else {
+ NS_ASSERTION(!mContentRefreshDrivers.Contains(aDriver),
+ "Adding a duplicate content refresh driver!");
+ mContentRefreshDrivers.AppendElement(aDriver);
+ }
+
+ if (startTimer) {
+ StartTimer();
+ }
+ }
+
+ void RemoveRefreshDriver(nsRefreshDriver* aDriver) {
+ LOG("[%p] RemoveRefreshDriver %p", this, aDriver);
+
+ if (IsRootRefreshDriver(aDriver)) {
+ NS_ASSERTION(mRootRefreshDrivers.Contains(aDriver),
+ "RemoveRefreshDriver for a refresh driver that's not in the "
+ "root refresh list!");
+ mRootRefreshDrivers.RemoveElement(aDriver);
+ } else {
+ nsPresContext* pc = aDriver->GetPresContext();
+ nsPresContext* rootContext = pc ? pc->GetRootPresContext() : nullptr;
+ // During PresContext shutdown, we can't accurately detect
+ // if a root refresh driver exists or not. Therefore, we have to
+ // search and find out which list this driver exists in.
+ if (!rootContext) {
+ if (mRootRefreshDrivers.Contains(aDriver)) {
+ mRootRefreshDrivers.RemoveElement(aDriver);
+ } else {
+ NS_ASSERTION(mContentRefreshDrivers.Contains(aDriver),
+ "RemoveRefreshDriver without a display root for a "
+ "driver that is not in the content refresh list");
+ mContentRefreshDrivers.RemoveElement(aDriver);
+ }
+ } else {
+ NS_ASSERTION(mContentRefreshDrivers.Contains(aDriver),
+ "RemoveRefreshDriver for a driver that is not in the "
+ "content refresh list");
+ mContentRefreshDrivers.RemoveElement(aDriver);
+ }
+ }
+
+ bool stopTimer =
+ mContentRefreshDrivers.IsEmpty() && mRootRefreshDrivers.IsEmpty();
+ if (stopTimer) {
+ StopTimer();
+ }
+ }
+
+ TimeStamp MostRecentRefresh() const { return mLastFireTime; }
+ VsyncId MostRecentRefreshVsyncId() const { return mLastFireId; }
+
+ virtual TimeDuration GetTimerRate() = 0;
+
+ TimeStamp GetIdleDeadlineHint(TimeStamp aDefault) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ TimeStamp mostRecentRefresh = MostRecentRefresh();
+ TimeDuration refreshPeriod = GetTimerRate();
+ TimeStamp idleEnd = mostRecentRefresh + refreshPeriod;
+ bool inHighRateMode = nsRefreshDriver::IsInHighRateMode();
+
+ // If we haven't painted for some time, then guess that we won't paint
+ // again for a while, so the refresh driver is not a good way to predict
+ // idle time.
+ if (!inHighRateMode &&
+ (idleEnd +
+ refreshPeriod *
+ StaticPrefs::layout_idle_period_required_quiescent_frames() <
+ TimeStamp::Now())) {
+ return aDefault;
+ }
+
+ // End the predicted idle time a little early, the amount controlled by a
+ // pref, to prevent overrunning the idle time and delaying a frame.
+ // But do that only if we aren't in high rate mode.
+ idleEnd =
+ idleEnd -
+ TimeDuration::FromMilliseconds(
+ inHighRateMode ? 0 : StaticPrefs::layout_idle_period_time_limit());
+ return idleEnd < aDefault ? idleEnd : aDefault;
+ }
+
+ Maybe<TimeStamp> GetNextTickHint() {
+ MOZ_ASSERT(NS_IsMainThread());
+ TimeStamp nextTick = MostRecentRefresh() + GetTimerRate();
+ return nextTick < TimeStamp::Now() ? Nothing() : Some(nextTick);
+ }
+
+ // Returns null if the RefreshDriverTimer is attached to several
+ // RefreshDrivers. That may happen for example when there are
+ // several windows open.
+ nsPresContext* GetPresContextForOnlyRefreshDriver() {
+ if (mRootRefreshDrivers.Length() == 1 && mContentRefreshDrivers.IsEmpty()) {
+ return mRootRefreshDrivers[0]->GetPresContext();
+ }
+ if (mContentRefreshDrivers.Length() == 1 && mRootRefreshDrivers.IsEmpty()) {
+ return mContentRefreshDrivers[0]->GetPresContext();
+ }
+ return nullptr;
+ }
+
+ bool IsAnyToplevelContentPageLoading() {
+ for (nsTArray<RefPtr<nsRefreshDriver>>* drivers :
+ {&mRootRefreshDrivers, &mContentRefreshDrivers}) {
+ for (RefPtr<nsRefreshDriver>& driver : *drivers) {
+ if (nsPresContext* pc = driver->GetPresContext()) {
+ if (pc->Document()->IsTopLevelContentDocument() &&
+ pc->Document()->GetReadyStateEnum() <
+ Document::READYSTATE_COMPLETE) {
+ return true;
+ }
+ }
+ }
+ }
+
+ return false;
+ }
+
+ protected:
+ virtual ~RefreshDriverTimer() {
+ MOZ_ASSERT(
+ mContentRefreshDrivers.Length() == 0,
+ "Should have removed all content refresh drivers from here by now!");
+ MOZ_ASSERT(
+ mRootRefreshDrivers.Length() == 0,
+ "Should have removed all root refresh drivers from here by now!");
+ }
+
+ virtual void StartTimer() = 0;
+ virtual void StopTimer() = 0;
+ virtual void ScheduleNextTick(TimeStamp aNowTime) = 0;
+
+ public:
+ virtual bool IsTicking() const = 0;
+
+ protected:
+ bool IsRootRefreshDriver(nsRefreshDriver* aDriver) {
+ nsPresContext* pc = aDriver->GetPresContext();
+ nsPresContext* rootContext = pc ? pc->GetRootPresContext() : nullptr;
+ if (!rootContext) {
+ return false;
+ }
+
+ return aDriver == rootContext->RefreshDriver();
+ }
+
+ /*
+ * Actually runs a tick, poking all the attached RefreshDrivers.
+ * Grabs the "now" time via TimeStamp::Now().
+ */
+ void Tick() {
+ TimeStamp now = TimeStamp::Now();
+ Tick(VsyncId(), now);
+ }
+
+ void TickRefreshDrivers(VsyncId aId, TimeStamp aNow,
+ nsTArray<RefPtr<nsRefreshDriver>>& aDrivers) {
+ if (aDrivers.IsEmpty()) {
+ return;
+ }
+
+ for (nsRefreshDriver* driver : aDrivers.Clone()) {
+ // don't poke this driver if it's in test mode
+ if (driver->IsTestControllingRefreshesEnabled()) {
+ continue;
+ }
+
+ TickDriver(driver, aId, aNow);
+ }
+ }
+
+ /*
+ * Tick the refresh drivers based on the given timestamp.
+ */
+ void Tick(VsyncId aId, TimeStamp now) {
+ ScheduleNextTick(now);
+
+ mLastFireTime = now;
+ mLastFireId = aId;
+
+ LOG("[%p] ticking drivers...", this);
+
+ TickRefreshDrivers(aId, now, mContentRefreshDrivers);
+ TickRefreshDrivers(aId, now, mRootRefreshDrivers);
+
+ LOG("[%p] done.", this);
+ }
+
+ static void TickDriver(nsRefreshDriver* driver, VsyncId aId, TimeStamp now) {
+ driver->Tick(aId, now);
+ }
+
+ TimeStamp mLastFireTime;
+ VsyncId mLastFireId;
+ TimeStamp mTargetTime;
+
+ nsTArray<RefPtr<nsRefreshDriver>> mContentRefreshDrivers;
+ nsTArray<RefPtr<nsRefreshDriver>> mRootRefreshDrivers;
+
+ // useful callback for nsITimer-based derived classes, here
+ // because of c++ protected shenanigans
+ static void TimerTick(nsITimer* aTimer, void* aClosure) {
+ RefPtr<RefreshDriverTimer> timer =
+ static_cast<RefreshDriverTimer*>(aClosure);
+ timer->Tick();
+ }
+};
+
+/*
+ * A RefreshDriverTimer that uses a nsITimer as the underlying timer. Note that
+ * this is a ONE_SHOT timer, not a repeating one! Subclasses are expected to
+ * implement ScheduleNextTick and intelligently calculate the next time to tick,
+ * and to reset mTimer. Using a repeating nsITimer gets us into a lot of pain
+ * with its attempt at intelligent slack removal and such, so we don't do it.
+ */
+class SimpleTimerBasedRefreshDriverTimer : public RefreshDriverTimer {
+ public:
+ /*
+ * aRate -- the delay, in milliseconds, requested between timer firings
+ */
+ explicit SimpleTimerBasedRefreshDriverTimer(double aRate) {
+ SetRate(aRate);
+ mTimer = NS_NewTimer();
+ }
+
+ virtual ~SimpleTimerBasedRefreshDriverTimer() override { StopTimer(); }
+
+ // will take effect at next timer tick
+ virtual void SetRate(double aNewRate) {
+ mRateMilliseconds = aNewRate;
+ mRateDuration = TimeDuration::FromMilliseconds(mRateMilliseconds);
+ }
+
+ double GetRate() const { return mRateMilliseconds; }
+
+ TimeDuration GetTimerRate() override { return mRateDuration; }
+
+ protected:
+ void StartTimer() override {
+ // pretend we just fired, and we schedule the next tick normally
+ mLastFireTime = TimeStamp::Now();
+ mLastFireId = VsyncId();
+
+ mTargetTime = mLastFireTime + mRateDuration;
+
+ uint32_t delay = static_cast<uint32_t>(mRateMilliseconds);
+ mTimer->InitWithNamedFuncCallback(
+ TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT,
+ "SimpleTimerBasedRefreshDriverTimer::StartTimer");
+ }
+
+ void StopTimer() override { mTimer->Cancel(); }
+
+ double mRateMilliseconds;
+ TimeDuration mRateDuration;
+ RefPtr<nsITimer> mTimer;
+};
+
+/*
+ * A refresh driver that listens to vsync events and ticks the refresh driver
+ * on vsync intervals. We throttle the refresh driver if we get too many
+ * vsync events and wait to catch up again.
+ */
+class VsyncRefreshDriverTimer : public RefreshDriverTimer {
+ public:
+ // This is used in the parent process for all platforms except Linux Wayland.
+ static RefPtr<VsyncRefreshDriverTimer>
+ CreateForParentProcessWithGlobalVsync() {
+ MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
+ MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ RefPtr<VsyncDispatcher> vsyncDispatcher =
+ gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher();
+ RefPtr<VsyncRefreshDriverTimer> timer =
+ new VsyncRefreshDriverTimer(std::move(vsyncDispatcher), nullptr);
+ return timer.forget();
+ }
+
+ // This is used in the parent process for Linux Wayland only, where we have a
+ // per-widget VsyncSource which is independent from the gfxPlatform's global
+ // VsyncSource.
+ static RefPtr<VsyncRefreshDriverTimer>
+ CreateForParentProcessWithLocalVsyncDispatcher(
+ RefPtr<VsyncDispatcher>&& aVsyncDispatcher) {
+ MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
+ MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ RefPtr<VsyncRefreshDriverTimer> timer =
+ new VsyncRefreshDriverTimer(std::move(aVsyncDispatcher), nullptr);
+ return timer.forget();
+ }
+
+ // This is used in the content process.
+ static RefPtr<VsyncRefreshDriverTimer> CreateForContentProcess(
+ RefPtr<VsyncMainChild>&& aVsyncChild) {
+ MOZ_RELEASE_ASSERT(XRE_IsContentProcess());
+ MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ RefPtr<VsyncRefreshDriverTimer> timer =
+ new VsyncRefreshDriverTimer(nullptr, std::move(aVsyncChild));
+ return timer.forget();
+ }
+
+ TimeDuration GetTimerRate() override {
+ if (mVsyncDispatcher) {
+ mVsyncRate = mVsyncDispatcher->GetVsyncRate();
+ } else if (mVsyncChild) {
+ mVsyncRate = mVsyncChild->GetVsyncRate();
+ }
+
+ // If hardware queries fail / are unsupported, we have to just guess.
+ return mVsyncRate != TimeDuration::Forever()
+ ? mVsyncRate
+ : TimeDuration::FromMilliseconds(1000.0 / 60.0);
+ }
+
+ private:
+ // RefreshDriverVsyncObserver redirects vsync notifications to the main thread
+ // and calls VsyncRefreshDriverTimer::NotifyVsyncOnMainThread on it. It also
+ // acts as a weak reference to the refresh driver timer, dropping its
+ // reference when RefreshDriverVsyncObserver::Shutdown is called from the
+ // timer's destructor.
+ //
+ // RefreshDriverVsyncObserver::NotifyVsync is called from different places
+ // depending on the process type.
+ //
+ // Parent process:
+ // NotifyVsync is called by RefreshDriverVsyncDispatcher, on a background
+ // thread. RefreshDriverVsyncDispatcher keeps strong references to its
+ // VsyncObservers, both in its array of observers and while calling
+ // NotifyVsync. So it might drop its last reference to the observer on a
+ // background thread. This means that the VsyncRefreshDriverTimer itself can't
+ // be the observer (because its destructor would potentially be run on a
+ // background thread), and it's why we use this separate class.
+ //
+ // Child process:
+ // NotifyVsync is called by VsyncMainChild, on the main thread.
+ // VsyncMainChild keeps raw pointers to its observers.
+ class RefreshDriverVsyncObserver final : public VsyncObserver {
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(
+ VsyncRefreshDriverTimer::RefreshDriverVsyncObserver, override)
+
+ public:
+ explicit RefreshDriverVsyncObserver(
+ VsyncRefreshDriverTimer* aVsyncRefreshDriverTimer)
+ : mVsyncRefreshDriverTimer(aVsyncRefreshDriverTimer),
+ mLastPendingVsyncNotification(
+ "RefreshDriverVsyncObserver::mLastPendingVsyncNotification") {
+ MOZ_ASSERT(NS_IsMainThread());
+ }
+
+ void NotifyVsync(const VsyncEvent& aVsync) override {
+ // Compress vsync notifications such that only 1 may run at a time
+ // This is so that we don't flood the refresh driver with vsync messages
+ // if the main thread is blocked for long periods of time
+ { // scope lock
+ auto pendingVsync = mLastPendingVsyncNotification.Lock();
+ bool hadPendingVsync = pendingVsync->isSome();
+ *pendingVsync = Some(aVsync);
+ if (hadPendingVsync) {
+ return;
+ }
+ }
+
+ if (XRE_IsContentProcess()) {
+ // In the content process, NotifyVsync is called by VsyncMainChild on
+ // the main thread. No need to use a runnable, just call
+ // NotifyVsyncTimerOnMainThread() directly.
+ NotifyVsyncTimerOnMainThread();
+ return;
+ }
+
+ // In the parent process, NotifyVsync is called on the vsync thread, which
+ // on most platforms is different from the main thread, so we need to
+ // dispatch a runnable for running NotifyVsyncTimerOnMainThread on the
+ // main thread.
+ // TODO: On Linux Wayland, the vsync thread is currently the main thread,
+ // and yet we still dispatch the runnable. Do we need to?
+ bool useVsyncPriority = mozilla::BrowserTabsRemoteAutostart();
+ nsCOMPtr<nsIRunnable> vsyncEvent = new PrioritizableRunnable(
+ NS_NewRunnableFunction(
+ "RefreshDriverVsyncObserver::NotifyVsyncTimerOnMainThread",
+ [self = RefPtr{this}]() {
+ self->NotifyVsyncTimerOnMainThread();
+ }),
+ useVsyncPriority ? nsIRunnablePriority::PRIORITY_VSYNC
+ : nsIRunnablePriority::PRIORITY_NORMAL);
+ NS_DispatchToMainThread(vsyncEvent);
+ }
+
+ void NotifyVsyncTimerOnMainThread() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (!mVsyncRefreshDriverTimer) {
+ // Ignore calls after Shutdown.
+ return;
+ }
+
+ VsyncEvent vsyncEvent;
+ {
+ // Get the last of the queued-up vsync notifications.
+ auto pendingVsync = mLastPendingVsyncNotification.Lock();
+ MOZ_RELEASE_ASSERT(
+ pendingVsync->isSome(),
+ "We should always have a pending vsync notification here.");
+ vsyncEvent = pendingVsync->extract();
+ }
+
+ // Call VsyncRefreshDriverTimer::NotifyVsyncOnMainThread, and keep a
+ // strong reference to it while calling the method.
+ RefPtr<VsyncRefreshDriverTimer> timer = mVsyncRefreshDriverTimer;
+ timer->NotifyVsyncOnMainThread(vsyncEvent);
+ }
+
+ void Shutdown() {
+ MOZ_ASSERT(NS_IsMainThread());
+ mVsyncRefreshDriverTimer = nullptr;
+ }
+
+ private:
+ ~RefreshDriverVsyncObserver() = default;
+
+ // VsyncRefreshDriverTimer holds this RefreshDriverVsyncObserver and it will
+ // be always available before Shutdown(). We can just use the raw pointer
+ // here.
+ // Only accessed on the main thread.
+ VsyncRefreshDriverTimer* mVsyncRefreshDriverTimer;
+
+ // Non-empty between a call to NotifyVsync and a call to
+ // NotifyVsyncOnMainThread. When multiple vsync notifications have been
+ // received between those two calls, this contains the last of the pending
+ // notifications. This is used both in the parent process and in the child
+ // process, but it only does something useful in the parent process. In the
+ // child process, both calls happen on the main thread right after one
+ // another, so there's only one notification to keep track of; vsync
+ // notification coalescing for child processes happens at the IPC level
+ // instead.
+ DataMutex<Maybe<VsyncEvent>> mLastPendingVsyncNotification;
+
+ }; // RefreshDriverVsyncObserver
+
+ VsyncRefreshDriverTimer(RefPtr<VsyncDispatcher>&& aVsyncDispatcher,
+ RefPtr<VsyncMainChild>&& aVsyncChild)
+ : mVsyncDispatcher(aVsyncDispatcher),
+ mVsyncChild(aVsyncChild),
+ mVsyncRate(TimeDuration::Forever()),
+ mRecentVsync(TimeStamp::Now()),
+ mLastTickStart(TimeStamp::Now()),
+ mLastIdleTaskCount(0),
+ mLastRunOutOfMTTasksCount(0),
+ mProcessedVsync(true) {
+ mVsyncObserver = new RefreshDriverVsyncObserver(this);
+ }
+
+ ~VsyncRefreshDriverTimer() override {
+ if (mVsyncDispatcher) {
+ mVsyncDispatcher->RemoveVsyncObserver(mVsyncObserver);
+ mVsyncDispatcher = nullptr;
+ } else if (mVsyncChild) {
+ mVsyncChild->RemoveChildRefreshTimer(mVsyncObserver);
+ mVsyncChild = nullptr;
+ }
+
+ // Detach current vsync timer from this VsyncObserver. The observer will no
+ // longer tick this timer.
+ mVsyncObserver->Shutdown();
+ mVsyncObserver = nullptr;
+ }
+
+ bool ShouldGiveNonVsyncTasksMoreTime() {
+ TaskController* taskController = TaskController::Get();
+ IdleTaskManager* idleTaskManager = taskController->GetIdleTaskManager();
+
+ // Note, pendingTaskCount includes also all the pending idle tasks.
+ uint64_t pendingTaskCount =
+ taskController->PendingMainthreadTaskCountIncludingSuspended();
+ uint64_t pendingIdleTaskCount = idleTaskManager->PendingTaskCount();
+ MOZ_ASSERT(pendingTaskCount >= pendingIdleTaskCount);
+
+ uint64_t idleTaskCount = idleTaskManager->ProcessedTaskCount();
+
+ // If we haven't processed new idle tasks and we have pending
+ // non-idle tasks, give those non-idle tasks more time,
+ // but only if the main thread wasn't totally empty at some point.
+ // In the parent process RunOutOfMTTasksCount() is less meaningful
+ // because some of the tasks run through AppShell.
+ return mLastIdleTaskCount == idleTaskCount &&
+ pendingTaskCount > pendingIdleTaskCount &&
+ (taskController->RunOutOfMTTasksCount() ==
+ mLastRunOutOfMTTasksCount ||
+ XRE_IsParentProcess());
+ }
+
+ void NotifyVsyncOnMainThread(const VsyncEvent& aVsyncEvent) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ mRecentVsync = aVsyncEvent.mTime;
+ mRecentVsyncId = aVsyncEvent.mId;
+ if (!mSuspendVsyncPriorityTicksUntil.IsNull() &&
+ mSuspendVsyncPriorityTicksUntil > aVsyncEvent.mTime) {
+ if (ShouldGiveNonVsyncTasksMoreTime()) {
+ if (!IsAnyToplevelContentPageLoading()) {
+ // If pages aren't loading and there aren't other tasks to run,
+ // trigger the pending vsync notification.
+ static bool sHasPendingLowPrioTask = false;
+ if (!sHasPendingLowPrioTask) {
+ sHasPendingLowPrioTask = true;
+ NS_DispatchToMainThreadQueue(
+ NS_NewRunnableFunction(
+ "NotifyVsyncOnMainThread[low priority]",
+ [self = RefPtr{this}, event = aVsyncEvent]() {
+ sHasPendingLowPrioTask = false;
+ if (self->mRecentVsync == event.mTime &&
+ self->mRecentVsyncId == event.mId &&
+ !self->ShouldGiveNonVsyncTasksMoreTime()) {
+ self->mSuspendVsyncPriorityTicksUntil = TimeStamp();
+ self->NotifyVsyncOnMainThread(event);
+ }
+ }),
+ EventQueuePriority::Low);
+ }
+ }
+ return;
+ }
+
+ // Clear the value since we aren't blocking anymore because there aren't
+ // any non-idle tasks to process.
+ mSuspendVsyncPriorityTicksUntil = TimeStamp();
+ }
+
+ if (StaticPrefs::layout_lower_priority_refresh_driver_during_load() &&
+ ShouldGiveNonVsyncTasksMoreTime()) {
+ nsPresContext* pctx = GetPresContextForOnlyRefreshDriver();
+ if (pctx && pctx->HadFirstContentfulPaint() && pctx->Document() &&
+ pctx->Document()->GetReadyStateEnum() <
+ Document::READYSTATE_COMPLETE) {
+ nsPIDOMWindowInner* win = pctx->Document()->GetInnerWindow();
+ uint32_t frameRateMultiplier = pctx->GetNextFrameRateMultiplier();
+ if (!frameRateMultiplier) {
+ pctx->DidUseFrameRateMultiplier();
+ }
+ if (win && frameRateMultiplier) {
+ dom::Performance* perf = win->GetPerformance();
+ // Limit slower refresh rate to 5 seconds between the
+ // first contentful paint and page load.
+ if (perf &&
+ perf->Now() < StaticPrefs::page_load_deprioritization_period()) {
+ if (mProcessedVsync) {
+ mProcessedVsync = false;
+ TimeDuration rate = GetTimerRate();
+ uint32_t slowRate = static_cast<uint32_t>(rate.ToMilliseconds() *
+ frameRateMultiplier);
+ pctx->DidUseFrameRateMultiplier();
+ nsCOMPtr<nsIRunnable> vsyncEvent = NewRunnableMethod<>(
+ "VsyncRefreshDriverTimer::IdlePriorityNotify", this,
+ &VsyncRefreshDriverTimer::IdlePriorityNotify);
+ NS_DispatchToCurrentThreadQueue(vsyncEvent.forget(), slowRate,
+ EventQueuePriority::Idle);
+ }
+ return;
+ }
+ }
+ }
+ }
+
+ TickRefreshDriver(aVsyncEvent.mId, aVsyncEvent.mTime);
+ }
+
+ void RecordTelemetryProbes(TimeStamp aVsyncTimestamp) {
+ MOZ_ASSERT(NS_IsMainThread());
+#ifndef ANDROID /* bug 1142079 */
+ if (XRE_IsParentProcess()) {
+ TimeDuration vsyncLatency = TimeStamp::Now() - aVsyncTimestamp;
+ uint32_t sample = (uint32_t)vsyncLatency.ToMilliseconds();
+ Telemetry::Accumulate(Telemetry::FX_REFRESH_DRIVER_CHROME_FRAME_DELAY_MS,
+ sample);
+ Telemetry::Accumulate(
+ Telemetry::FX_REFRESH_DRIVER_SYNC_SCROLL_FRAME_DELAY_MS, sample);
+ } else if (mVsyncRate != TimeDuration::Forever()) {
+ TimeDuration contentDelay =
+ (TimeStamp::Now() - mLastTickStart) - mVsyncRate;
+ if (contentDelay.ToMilliseconds() < 0) {
+ // Vsyncs are noisy and some can come at a rate quicker than
+ // the reported hardware rate. In those cases, consider that we have 0
+ // delay.
+ contentDelay = TimeDuration::FromMilliseconds(0);
+ }
+ uint32_t sample = (uint32_t)contentDelay.ToMilliseconds();
+ Telemetry::Accumulate(Telemetry::FX_REFRESH_DRIVER_CONTENT_FRAME_DELAY_MS,
+ sample);
+ Telemetry::Accumulate(
+ Telemetry::FX_REFRESH_DRIVER_SYNC_SCROLL_FRAME_DELAY_MS, sample);
+ } else {
+ // Request the vsync rate which VsyncChild stored the last time it got a
+ // vsync notification.
+ mVsyncRate = mVsyncChild->GetVsyncRate();
+ }
+#endif
+ }
+
+ void OnTimerStart() {
+ mLastTickStart = TimeStamp::Now();
+ mLastTickEnd = TimeStamp();
+ mLastIdleTaskCount = 0;
+ }
+
+ void IdlePriorityNotify() {
+ if (mLastProcessedTick.IsNull() || mRecentVsync > mLastProcessedTick) {
+ // mSuspendVsyncPriorityTicksUntil is for high priority vsync
+ // notifications only.
+ mSuspendVsyncPriorityTicksUntil = TimeStamp();
+ TickRefreshDriver(mRecentVsyncId, mRecentVsync);
+ }
+
+ mProcessedVsync = true;
+ }
+
+ void TickRefreshDriver(VsyncId aId, TimeStamp aVsyncTimestamp) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ RecordTelemetryProbes(aVsyncTimestamp);
+
+ TimeStamp tickStart = TimeStamp::Now();
+
+ TimeDuration rate = GetTimerRate();
+ if (TimeDuration::FromMilliseconds(nsRefreshDriver::DefaultInterval() / 2) >
+ rate) {
+ sMostRecentHighRateVsync = tickStart;
+ }
+
+ // On 32-bit Windows we sometimes get times where TimeStamp::Now() is not
+ // monotonic because the underlying system apis produce non-monontonic
+ // results. (bug 1306896)
+#if !defined(_WIN32)
+ MOZ_ASSERT(aVsyncTimestamp <= tickStart);
+#endif
+
+ bool shouldGiveNonVSyncTasksMoreTime = ShouldGiveNonVsyncTasksMoreTime();
+
+ // Set these variables before calling RunRefreshDrivers so that they are
+ // visible to any nested ticks.
+ mLastTickStart = tickStart;
+ mLastProcessedTick = aVsyncTimestamp;
+
+ RunRefreshDrivers(aId, aVsyncTimestamp);
+
+ TimeStamp tickEnd = TimeStamp::Now();
+
+ // Re-read mLastTickStart in case there was a nested tick inside this
+ // tick.
+ TimeStamp mostRecentTickStart = mLastTickStart;
+
+ // Let also non-RefreshDriver code to run at least for awhile if we have
+ // a mVsyncRefreshDriverTimer.
+ // Always give a tiny bit, 1% of the vsync interval, time outside the
+ // tick
+ // In case there are both normal tasks and RefreshDrivers are doing
+ // work, mSuspendVsyncPriorityTicksUntil will be set to a timestamp in the
+ // future where the period between the previous tick start
+ // (aVsyncTimestamp) and the next tick needs to be at least the amount of
+ // work normal tasks and RefreshDrivers did together (minus short grace
+ // period).
+ TimeDuration gracePeriod = rate / int64_t(100);
+
+ if (shouldGiveNonVSyncTasksMoreTime) {
+ if (!mLastTickEnd.IsNull() && XRE_IsContentProcess() &&
+ // For RefreshDriver scheduling during page load there is currently
+ // idle priority based setup.
+ // XXX Consider to remove the page load specific code paths.
+ !IsAnyToplevelContentPageLoading()) {
+ // In case normal tasks are doing lots of work, we still want to paint
+ // every now and then, so only at maximum 4 * rate of work is counted
+ // here.
+ // If we're giving extra time for tasks outside a tick, try to
+ // ensure the next vsync after that period is handled, so subtract
+ // a grace period.
+ TimeDuration timeForOutsideTick = clamped(
+ tickStart - mLastTickEnd - gracePeriod, TimeDuration(), rate * 4);
+ mSuspendVsyncPriorityTicksUntil = aVsyncTimestamp + timeForOutsideTick +
+ (tickEnd - mostRecentTickStart);
+ } else {
+ mSuspendVsyncPriorityTicksUntil =
+ aVsyncTimestamp + gracePeriod + (tickEnd - mostRecentTickStart);
+ }
+ } else {
+ mSuspendVsyncPriorityTicksUntil = aVsyncTimestamp + gracePeriod;
+ }
+
+ mLastIdleTaskCount =
+ TaskController::Get()->GetIdleTaskManager()->ProcessedTaskCount();
+ mLastRunOutOfMTTasksCount = TaskController::Get()->RunOutOfMTTasksCount();
+ mLastTickEnd = tickEnd;
+ }
+
+ void StartTimer() override {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ mLastFireTime = TimeStamp::Now();
+ mLastFireId = VsyncId();
+
+ if (mVsyncDispatcher) {
+ mVsyncDispatcher->AddVsyncObserver(mVsyncObserver);
+ } else if (mVsyncChild) {
+ mVsyncChild->AddChildRefreshTimer(mVsyncObserver);
+ OnTimerStart();
+ }
+ mIsTicking = true;
+ }
+
+ void StopTimer() override {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (mVsyncDispatcher) {
+ mVsyncDispatcher->RemoveVsyncObserver(mVsyncObserver);
+ } else if (mVsyncChild) {
+ mVsyncChild->RemoveChildRefreshTimer(mVsyncObserver);
+ }
+ mIsTicking = false;
+ }
+
+ public:
+ bool IsTicking() const override { return mIsTicking; }
+
+ protected:
+ void ScheduleNextTick(TimeStamp aNowTime) override {
+ // Do nothing since we just wait for the next vsync from
+ // RefreshDriverVsyncObserver.
+ }
+
+ void RunRefreshDrivers(VsyncId aId, TimeStamp aTimeStamp) {
+ Tick(aId, aTimeStamp);
+ for (auto& driver : mContentRefreshDrivers) {
+ driver->FinishedVsyncTick();
+ }
+ for (auto& driver : mRootRefreshDrivers) {
+ driver->FinishedVsyncTick();
+ }
+ }
+
+ // Always non-null. Has a weak pointer to us and notifies us of vsync.
+ RefPtr<RefreshDriverVsyncObserver> mVsyncObserver;
+
+ // Used in the parent process. We register mVsyncObserver with it for the
+ // duration during which we want to receive vsync notifications. We also
+ // use it to query the current vsync rate.
+ RefPtr<VsyncDispatcher> mVsyncDispatcher;
+ // Used it the content process. We register mVsyncObserver with it for the
+ // duration during which we want to receive vsync notifications. The
+ // mVsyncChild will be always available before VsyncChild::ActorDestroy().
+ // After ActorDestroy(), StartTimer() and StopTimer() calls will be non-op.
+ RefPtr<VsyncMainChild> mVsyncChild;
+
+ TimeDuration mVsyncRate;
+ bool mIsTicking = false;
+
+ TimeStamp mRecentVsync;
+ VsyncId mRecentVsyncId;
+ // The local start time when RefreshDrivers' Tick was called last time.
+ TimeStamp mLastTickStart;
+ // The local end time of the last RefreshDrivers' tick.
+ TimeStamp mLastTickEnd;
+ // The number of idle tasks the main thread has processed. It is updated
+ // right after RefreshDrivers' tick.
+ uint64_t mLastIdleTaskCount;
+ // If there were no idle tasks, we need to check if the main event queue
+ // was totally empty at times.
+ uint64_t mLastRunOutOfMTTasksCount;
+ // Note, mLastProcessedTick stores the vsync timestamp, which may be coming
+ // from a different process.
+ TimeStamp mLastProcessedTick;
+ // mSuspendVsyncPriorityTicksUntil is used to block too high refresh rate in
+ // case the main thread has also other non-idle tasks to process.
+ // The timestamp is effectively mLastProcessedTick + some duration.
+ TimeStamp mSuspendVsyncPriorityTicksUntil;
+ bool mProcessedVsync;
+}; // VsyncRefreshDriverTimer
+
+/**
+ * Since the content process takes some time to setup
+ * the vsync IPC connection, this timer is used
+ * during the intial startup process.
+ * During initial startup, the refresh drivers
+ * are ticked off this timer, and are swapped out once content
+ * vsync IPC connection is established.
+ */
+class StartupRefreshDriverTimer : public SimpleTimerBasedRefreshDriverTimer {
+ public:
+ explicit StartupRefreshDriverTimer(double aRate)
+ : SimpleTimerBasedRefreshDriverTimer(aRate) {}
+
+ protected:
+ void ScheduleNextTick(TimeStamp aNowTime) override {
+ // Since this is only used for startup, it isn't super critical
+ // that we tick at consistent intervals.
+ TimeStamp newTarget = aNowTime + mRateDuration;
+ uint32_t delay =
+ static_cast<uint32_t>((newTarget - aNowTime).ToMilliseconds());
+ mTimer->InitWithNamedFuncCallback(
+ TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT,
+ "StartupRefreshDriverTimer::ScheduleNextTick");
+ mTargetTime = newTarget;
+ }
+
+ public:
+ bool IsTicking() const override { return true; }
+};
+
+/*
+ * A RefreshDriverTimer for inactive documents. When a new refresh driver is
+ * added, the rate is reset to the base (normally 1s/1fps). Every time
+ * it ticks, a single refresh driver is poked. Once they have all been poked,
+ * the duration between ticks doubles, up to mDisableAfterMilliseconds. At that
+ * point, the timer is quiet and doesn't tick (until something is added to it
+ * again).
+ *
+ * When a timer is removed, there is a possibility of another timer
+ * being skipped for one cycle. We could avoid this by adjusting
+ * mNextDriverIndex in RemoveRefreshDriver, but there's little need to
+ * add that complexity. All we want is for inactive drivers to tick
+ * at some point, but we don't care too much about how often.
+ */
+class InactiveRefreshDriverTimer final
+ : public SimpleTimerBasedRefreshDriverTimer {
+ public:
+ explicit InactiveRefreshDriverTimer(double aRate)
+ : SimpleTimerBasedRefreshDriverTimer(aRate),
+ mNextTickDuration(aRate),
+ mDisableAfterMilliseconds(-1.0),
+ mNextDriverIndex(0) {}
+
+ InactiveRefreshDriverTimer(double aRate, double aDisableAfterMilliseconds)
+ : SimpleTimerBasedRefreshDriverTimer(aRate),
+ mNextTickDuration(aRate),
+ mDisableAfterMilliseconds(aDisableAfterMilliseconds),
+ mNextDriverIndex(0) {}
+
+ void AddRefreshDriver(nsRefreshDriver* aDriver) override {
+ RefreshDriverTimer::AddRefreshDriver(aDriver);
+
+ LOG("[%p] inactive timer got new refresh driver %p, resetting rate", this,
+ aDriver);
+
+ // reset the timer, and start with the newly added one next time.
+ mNextTickDuration = mRateMilliseconds;
+
+ // we don't really have to start with the newly added one, but we may as
+ // well not tick the old ones at the fastest rate any more than we need to.
+ mNextDriverIndex = GetRefreshDriverCount() - 1;
+
+ StopTimer();
+ StartTimer();
+ }
+
+ TimeDuration GetTimerRate() override {
+ return TimeDuration::FromMilliseconds(mNextTickDuration);
+ }
+
+ protected:
+ uint32_t GetRefreshDriverCount() {
+ return mContentRefreshDrivers.Length() + mRootRefreshDrivers.Length();
+ }
+
+ void StartTimer() override {
+ mLastFireTime = TimeStamp::Now();
+ mLastFireId = VsyncId();
+
+ mTargetTime = mLastFireTime + mRateDuration;
+
+ uint32_t delay = static_cast<uint32_t>(mRateMilliseconds);
+ mTimer->InitWithNamedFuncCallback(TimerTickOne, this, delay,
+ nsITimer::TYPE_ONE_SHOT,
+ "InactiveRefreshDriverTimer::StartTimer");
+ mIsTicking = true;
+ }
+
+ void StopTimer() override {
+ mTimer->Cancel();
+ mIsTicking = false;
+ }
+
+ void ScheduleNextTick(TimeStamp aNowTime) override {
+ if (mDisableAfterMilliseconds > 0.0 &&
+ mNextTickDuration > mDisableAfterMilliseconds) {
+ // We hit the time after which we should disable
+ // inactive window refreshes; don't schedule anything
+ // until we get kicked by an AddRefreshDriver call.
+ return;
+ }
+
+ // double the next tick time if we've already gone through all of them once
+ if (mNextDriverIndex >= GetRefreshDriverCount()) {
+ mNextTickDuration *= 2.0;
+ mNextDriverIndex = 0;
+ }
+
+ // this doesn't need to be precise; do a simple schedule
+ uint32_t delay = static_cast<uint32_t>(mNextTickDuration);
+ mTimer->InitWithNamedFuncCallback(
+ TimerTickOne, this, delay, nsITimer::TYPE_ONE_SHOT,
+ "InactiveRefreshDriverTimer::ScheduleNextTick");
+
+ LOG("[%p] inactive timer next tick in %f ms [index %d/%d]", this,
+ mNextTickDuration, mNextDriverIndex, GetRefreshDriverCount());
+ }
+
+ public:
+ bool IsTicking() const override { return mIsTicking; }
+
+ protected:
+ /* Runs just one driver's tick. */
+ void TickOne() {
+ TimeStamp now = TimeStamp::Now();
+
+ ScheduleNextTick(now);
+
+ mLastFireTime = now;
+ mLastFireId = VsyncId();
+
+ nsTArray<RefPtr<nsRefreshDriver>> drivers(mContentRefreshDrivers.Clone());
+ drivers.AppendElements(mRootRefreshDrivers);
+ size_t index = mNextDriverIndex;
+
+ if (index < drivers.Length() &&
+ !drivers[index]->IsTestControllingRefreshesEnabled()) {
+ TickDriver(drivers[index], VsyncId(), now);
+ }
+
+ mNextDriverIndex++;
+ }
+
+ static void TimerTickOne(nsITimer* aTimer, void* aClosure) {
+ RefPtr<InactiveRefreshDriverTimer> timer =
+ static_cast<InactiveRefreshDriverTimer*>(aClosure);
+ timer->TickOne();
+ }
+
+ double mNextTickDuration;
+ double mDisableAfterMilliseconds;
+ uint32_t mNextDriverIndex;
+ bool mIsTicking = false;
+};
+
+} // namespace mozilla
+
+static StaticRefPtr<RefreshDriverTimer> sRegularRateTimer;
+static StaticAutoPtr<nsTArray<RefreshDriverTimer*>> sRegularRateTimerList;
+static StaticRefPtr<InactiveRefreshDriverTimer> sThrottledRateTimer;
+
+void nsRefreshDriver::CreateVsyncRefreshTimer() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (gfxPlatform::IsInLayoutAsapMode()) {
+ return;
+ }
+
+ if (!mOwnTimer) {
+ // If available, we fetch the widget-specific vsync source.
+ nsPresContext* pc = GetPresContext();
+ nsCOMPtr<nsIWidget> widget = pc->GetRootWidget();
+ if (widget) {
+ if (RefPtr<VsyncDispatcher> vsyncDispatcher =
+ widget->GetVsyncDispatcher()) {
+ mOwnTimer = VsyncRefreshDriverTimer::
+ CreateForParentProcessWithLocalVsyncDispatcher(
+ std::move(vsyncDispatcher));
+ sRegularRateTimerList->AppendElement(mOwnTimer.get());
+ return;
+ }
+ if (BrowserChild* browserChild = widget->GetOwningBrowserChild()) {
+ if (RefPtr<VsyncMainChild> vsyncChildViaPBrowser =
+ browserChild->GetVsyncChild()) {
+ mOwnTimer = VsyncRefreshDriverTimer::CreateForContentProcess(
+ std::move(vsyncChildViaPBrowser));
+ sRegularRateTimerList->AppendElement(mOwnTimer.get());
+ return;
+ }
+ }
+ }
+ }
+ if (!sRegularRateTimer) {
+ if (XRE_IsParentProcess()) {
+ // Make sure all vsync systems are ready.
+ gfxPlatform::GetPlatform();
+ // In parent process, we can create the VsyncRefreshDriverTimer directly.
+ sRegularRateTimer =
+ VsyncRefreshDriverTimer::CreateForParentProcessWithGlobalVsync();
+ } else {
+ PBackgroundChild* actorChild =
+ BackgroundChild::GetOrCreateForCurrentThread();
+ if (NS_WARN_IF(!actorChild)) {
+ return;
+ }
+
+ auto vsyncChildViaPBackground = MakeRefPtr<dom::VsyncMainChild>();
+ dom::PVsyncChild* actor =
+ actorChild->SendPVsyncConstructor(vsyncChildViaPBackground);
+ if (NS_WARN_IF(!actor)) {
+ return;
+ }
+
+ RefPtr<RefreshDriverTimer> vsyncRefreshDriverTimer =
+ VsyncRefreshDriverTimer::CreateForContentProcess(
+ std::move(vsyncChildViaPBackground));
+
+ sRegularRateTimer = std::move(vsyncRefreshDriverTimer);
+ }
+ }
+}
+
+static uint32_t GetFirstFrameDelay(imgIRequest* req) {
+ nsCOMPtr<imgIContainer> container;
+ if (NS_FAILED(req->GetImage(getter_AddRefs(container))) || !container) {
+ return 0;
+ }
+
+ // If this image isn't animated, there isn't a first frame delay.
+ int32_t delay = container->GetFirstFrameDelay();
+ if (delay < 0) return 0;
+
+ return static_cast<uint32_t>(delay);
+}
+
+/* static */
+void nsRefreshDriver::Shutdown() {
+ MOZ_ASSERT(NS_IsMainThread());
+ // clean up our timers
+ sRegularRateTimer = nullptr;
+ sRegularRateTimerList = nullptr;
+ sThrottledRateTimer = nullptr;
+}
+
+/* static */
+int32_t nsRefreshDriver::DefaultInterval() {
+ return NSToIntRound(1000.0 / gfxPlatform::GetDefaultFrameRate());
+}
+
+/* static */
+bool nsRefreshDriver::IsInHighRateMode() {
+ // We're in high rate mode if we've gotten a fast rate during the last
+ // DefaultInterval().
+ bool inHighRateMode =
+ !gfxPlatform::IsInLayoutAsapMode() &&
+ StaticPrefs::layout_expose_high_rate_mode_from_refreshdriver() &&
+ !sMostRecentHighRateVsync.IsNull() &&
+ (sMostRecentHighRateVsync +
+ TimeDuration::FromMilliseconds(DefaultInterval())) > TimeStamp::Now();
+ if (!inHighRateMode) {
+ // Clear the timestamp so that the next call is faster.
+ sMostRecentHighRateVsync = TimeStamp();
+ }
+ return inHighRateMode;
+}
+
+// Compute the interval to use for the refresh driver timer, in milliseconds.
+// outIsDefault indicates that rate was not explicitly set by the user
+// so we might choose other, more appropriate rates (e.g. vsync, etc)
+// layout.frame_rate=0 indicates "ASAP mode".
+// In ASAP mode rendering is iterated as fast as possible (typically for stress
+// testing). A target rate of 10k is used internally instead of special-handling
+// 0. Backends which block on swap/present/etc should try to not block when
+// layout.frame_rate=0 - to comply with "ASAP" as much as possible.
+double nsRefreshDriver::GetRegularTimerInterval() const {
+ int32_t rate = Preferences::GetInt("layout.frame_rate", -1);
+ if (rate < 0) {
+ rate = gfxPlatform::GetDefaultFrameRate();
+ } else if (rate == 0) {
+ rate = 10000;
+ }
+
+ return 1000.0 / rate;
+}
+
+/* static */
+double nsRefreshDriver::GetThrottledTimerInterval() {
+ uint32_t rate = StaticPrefs::layout_throttled_frame_rate();
+ return 1000.0 / rate;
+}
+
+/* static */
+TimeDuration nsRefreshDriver::GetMinRecomputeVisibilityInterval() {
+ return TimeDuration::FromMilliseconds(
+ StaticPrefs::layout_visibility_min_recompute_interval_ms());
+}
+
+bool nsRefreshDriver::ComputeShouldBeThrottled() const {
+ if (mIsActive) {
+ // If we're active we should definitely be unthrottled.
+ return false;
+ }
+ if (!mIsInActiveTab) {
+ // If we're not in the active tab we should definitely be throttled.
+ return true;
+ }
+ if (mIsGrantingActivityGracePeriod) {
+ // If we're granting the activity grace period, then we should be
+ // unthrottled.
+ return false;
+ }
+ // Otherwise we should be throttled.
+ return true;
+}
+
+RefreshDriverTimer* nsRefreshDriver::ChooseTimer() {
+ if (mThrottled) {
+ if (!sThrottledRateTimer) {
+ sThrottledRateTimer = new InactiveRefreshDriverTimer(
+ GetThrottledTimerInterval(),
+ DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS * 1000.0);
+ }
+ return sThrottledRateTimer;
+ }
+
+ if (!mOwnTimer) {
+ CreateVsyncRefreshTimer();
+ }
+
+ if (mOwnTimer) {
+ return mOwnTimer.get();
+ }
+
+ if (!sRegularRateTimer) {
+ double rate = GetRegularTimerInterval();
+ sRegularRateTimer = new StartupRefreshDriverTimer(rate);
+ }
+
+ return sRegularRateTimer;
+}
+
+static nsDocShell* GetDocShell(nsPresContext* aPresContext) {
+ if (!aPresContext) {
+ return nullptr;
+ }
+ return static_cast<nsDocShell*>(aPresContext->GetDocShell());
+}
+
+nsRefreshDriver::nsRefreshDriver(nsPresContext* aPresContext)
+ : mActiveTimer(nullptr),
+ mOwnTimer(nullptr),
+ mPresContext(aPresContext),
+ mRootRefresh(nullptr),
+ mNextTransactionId{0},
+ mFreezeCount(0),
+ mThrottledFrameRequestInterval(
+ TimeDuration::FromMilliseconds(GetThrottledTimerInterval())),
+ mMinRecomputeVisibilityInterval(GetMinRecomputeVisibilityInterval()),
+ mThrottled(false),
+ mIsActive(true),
+ mIsInActiveTab(true),
+ mIsGrantingActivityGracePeriod(false),
+ mHasGrantedActivityGracePeriod(false),
+ mNeedToRecomputeVisibility(false),
+ mTestControllingRefreshes(false),
+ mViewManagerFlushIsPending(false),
+ mHasScheduleFlush(false),
+ mInRefresh(false),
+ mWaitingForTransaction(false),
+ mSkippedPaints(false),
+ mResizeSuppressed(false),
+ mNotifyDOMContentFlushed(false),
+ mNeedToUpdateIntersectionObservations(false),
+ mNeedToUpdateContentRelevancy(false),
+ mInNormalTick(false),
+ mAttemptedExtraTickSinceLastVsync(false),
+ mHasExceededAfterLoadTickPeriod(false),
+ mHasStartedTimerAtLeastOnce(false) {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(mPresContext,
+ "Need a pres context to tell us to call Disconnect() later "
+ "and decrement sRefreshDriverCount.");
+ mMostRecentRefresh = TimeStamp::Now();
+ mNextThrottledFrameRequestTick = mMostRecentRefresh;
+ mNextRecomputeVisibilityTick = mMostRecentRefresh;
+
+ if (!sRegularRateTimerList) {
+ sRegularRateTimerList = new nsTArray<RefreshDriverTimer*>();
+ }
+ ++sRefreshDriverCount;
+}
+
+nsRefreshDriver::~nsRefreshDriver() {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(ObserverCount() == mEarlyRunners.Length(),
+ "observers, except pending selection scrolls, "
+ "should have been unregistered");
+ MOZ_ASSERT(!mActiveTimer, "timer should be gone");
+ MOZ_ASSERT(!mPresContext,
+ "Should have called Disconnect() and decremented "
+ "sRefreshDriverCount!");
+
+ if (mRootRefresh) {
+ mRootRefresh->RemoveRefreshObserver(this, FlushType::Style);
+ mRootRefresh = nullptr;
+ }
+ if (mOwnTimer && sRegularRateTimerList) {
+ sRegularRateTimerList->RemoveElement(mOwnTimer.get());
+ }
+}
+
+// Method for testing. See nsIDOMWindowUtils.advanceTimeAndRefresh
+// for description.
+void nsRefreshDriver::AdvanceTimeAndRefresh(int64_t aMilliseconds) {
+ // ensure that we're removed from our driver
+ StopTimer();
+
+ if (!mTestControllingRefreshes) {
+ mMostRecentRefresh = TimeStamp::Now();
+
+ mTestControllingRefreshes = true;
+ if (mWaitingForTransaction) {
+ // Disable any refresh driver throttling when entering test mode
+ mWaitingForTransaction = false;
+ mSkippedPaints = false;
+ }
+ }
+
+ mMostRecentRefresh += TimeDuration::FromMilliseconds((double)aMilliseconds);
+
+ mozilla::dom::AutoNoJSAPI nojsapi;
+ DoTick();
+}
+
+void nsRefreshDriver::RestoreNormalRefresh() {
+ mTestControllingRefreshes = false;
+ EnsureTimerStarted(eAllowTimeToGoBackwards);
+ mPendingTransactions.Clear();
+}
+
+TimeStamp nsRefreshDriver::MostRecentRefresh(bool aEnsureTimerStarted) const {
+ // In case of stylo traversal, we have already activated the refresh driver in
+ // RestyleManager::ProcessPendingRestyles().
+ if (aEnsureTimerStarted && !ServoStyleSet::IsInServoTraversal()) {
+ const_cast<nsRefreshDriver*>(this)->EnsureTimerStarted();
+ }
+
+ return mMostRecentRefresh;
+}
+
+void nsRefreshDriver::AddRefreshObserver(nsARefreshObserver* aObserver,
+ FlushType aFlushType,
+ const char* aObserverDescription) {
+ ObserverArray& array = ArrayFor(aFlushType);
+ array.AppendElement(
+ ObserverData{aObserver, aObserverDescription, TimeStamp::Now(),
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)),
+ profiler_capture_backtrace(), aFlushType});
+ EnsureTimerStarted();
+}
+
+bool nsRefreshDriver::RemoveRefreshObserver(nsARefreshObserver* aObserver,
+ FlushType aFlushType) {
+ ObserverArray& array = ArrayFor(aFlushType);
+ auto index = array.IndexOf(aObserver);
+ if (index == ObserverArray::array_type::NoIndex) {
+ return false;
+ }
+
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ auto& data = array.ElementAt(index);
+ nsPrintfCString str("%s [%s]", data.mDescription,
+ kFlushTypeNames[aFlushType]);
+ PROFILER_MARKER_TEXT(
+ "RefreshObserver", GRAPHICS,
+ MarkerOptions(MarkerStack::TakeBacktrace(std::move(data.mCause)),
+ MarkerTiming::IntervalUntilNowFrom(data.mRegisterTime),
+ std::move(data.mInnerWindowId)),
+ str);
+ }
+
+ array.RemoveElementAt(index);
+ return true;
+}
+
+void nsRefreshDriver::AddTimerAdjustmentObserver(
+ nsATimerAdjustmentObserver* aObserver) {
+ MOZ_ASSERT(!mTimerAdjustmentObservers.Contains(aObserver));
+ mTimerAdjustmentObservers.AppendElement(aObserver);
+}
+
+void nsRefreshDriver::RemoveTimerAdjustmentObserver(
+ nsATimerAdjustmentObserver* aObserver) {
+ MOZ_ASSERT(mTimerAdjustmentObservers.Contains(aObserver));
+ mTimerAdjustmentObservers.RemoveElement(aObserver);
+}
+
+void nsRefreshDriver::PostVisualViewportResizeEvent(
+ VVPResizeEvent* aResizeEvent) {
+ mVisualViewportResizeEvents.AppendElement(aResizeEvent);
+ EnsureTimerStarted();
+}
+
+void nsRefreshDriver::DispatchVisualViewportResizeEvents() {
+ // We're taking a hint from scroll events and only dispatch the current set
+ // of queued resize events. If additional events are posted in response to
+ // the current events being dispatched, we'll dispatch them on the next tick.
+ VisualViewportResizeEventArray events =
+ std::move(mVisualViewportResizeEvents);
+ for (auto& event : events) {
+ event->Run();
+ }
+}
+
+void nsRefreshDriver::PostScrollEvent(mozilla::Runnable* aScrollEvent,
+ bool aDelayed) {
+ if (aDelayed) {
+ mDelayedScrollEvents.AppendElement(aScrollEvent);
+ } else {
+ mScrollEvents.AppendElement(aScrollEvent);
+ EnsureTimerStarted();
+ }
+}
+
+void nsRefreshDriver::DispatchScrollEvents() {
+ // Scroll events are one-shot, so after running them we can drop them.
+ // However, dispatching a scroll event can potentially cause more scroll
+ // events to be posted, so we move the initial set into a temporary array
+ // first. (Newly posted scroll events will be dispatched on the next tick.)
+ ScrollEventArray events = std::move(mScrollEvents);
+ for (auto& event : events) {
+ event->Run();
+ }
+}
+
+void nsRefreshDriver::PostVisualViewportScrollEvent(
+ VVPScrollEvent* aScrollEvent) {
+ mVisualViewportScrollEvents.AppendElement(aScrollEvent);
+ EnsureTimerStarted();
+}
+
+void nsRefreshDriver::DispatchVisualViewportScrollEvents() {
+ // Scroll events are one-shot, so after running them we can drop them.
+ // However, dispatching a scroll event can potentially cause more scroll
+ // events to be posted, so we move the initial set into a temporary array
+ // first. (Newly posted scroll events will be dispatched on the next tick.)
+ VisualViewportScrollEventArray events =
+ std::move(mVisualViewportScrollEvents);
+ for (auto& event : events) {
+ event->Run();
+ }
+}
+
+void nsRefreshDriver::AddPostRefreshObserver(
+ nsAPostRefreshObserver* aObserver) {
+ MOZ_ASSERT(!mPostRefreshObservers.Contains(aObserver));
+ mPostRefreshObservers.AppendElement(aObserver);
+}
+
+void nsRefreshDriver::RemovePostRefreshObserver(
+ nsAPostRefreshObserver* aObserver) {
+ bool removed = mPostRefreshObservers.RemoveElement(aObserver);
+ MOZ_DIAGNOSTIC_ASSERT(removed);
+ Unused << removed;
+}
+
+void nsRefreshDriver::AddImageRequest(imgIRequest* aRequest) {
+ uint32_t delay = GetFirstFrameDelay(aRequest);
+ if (delay == 0) {
+ mRequests.Insert(aRequest);
+ } else {
+ auto* const start = mStartTable.GetOrInsertNew(delay);
+ start->mEntries.Insert(aRequest);
+ }
+
+ EnsureTimerStarted();
+
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ nsCOMPtr<nsIURI> uri = aRequest->GetURI();
+
+ PROFILER_MARKER_TEXT("Image Animation", GRAPHICS,
+ MarkerOptions(MarkerTiming::IntervalStart(),
+ MarkerInnerWindowIdFromDocShell(
+ GetDocShell(mPresContext))),
+ nsContentUtils::TruncatedURLForDisplay(uri));
+ }
+}
+
+void nsRefreshDriver::RemoveImageRequest(imgIRequest* aRequest) {
+ // Try to remove from both places, just in case.
+ bool removed = mRequests.EnsureRemoved(aRequest);
+ uint32_t delay = GetFirstFrameDelay(aRequest);
+ if (delay != 0) {
+ ImageStartData* start = mStartTable.Get(delay);
+ if (start) {
+ removed = removed | start->mEntries.EnsureRemoved(aRequest);
+ }
+ }
+
+ if (removed && profiler_thread_is_being_profiled_for_markers()) {
+ nsCOMPtr<nsIURI> uri = aRequest->GetURI();
+
+ PROFILER_MARKER_TEXT("Image Animation", GRAPHICS,
+ MarkerOptions(MarkerTiming::IntervalEnd(),
+ MarkerInnerWindowIdFromDocShell(
+ GetDocShell(mPresContext))),
+ nsContentUtils::TruncatedURLForDisplay(uri));
+ }
+}
+
+void nsRefreshDriver::NotifyDOMContentLoaded() {
+ // If the refresh driver is going to tick, we mark the timestamp after
+ // everything is flushed in the next tick. If it isn't, mark ourselves as
+ // flushed now.
+ if (!HasObservers()) {
+ if (nsPresContext* pc = GetPresContext()) {
+ pc->NotifyDOMContentFlushed();
+ }
+ // else, we don't have a nsPresContext, so our doc is probably being
+ // destroyed and this notification doesn't need sending anyway.
+ } else {
+ mNotifyDOMContentFlushed = true;
+ }
+}
+
+void nsRefreshDriver::RegisterCompositionPayload(
+ const mozilla::layers::CompositionPayload& aPayload) {
+ mCompositionPayloads.AppendElement(aPayload);
+}
+
+void nsRefreshDriver::AddForceNotifyContentfulPaintPresContext(
+ nsPresContext* aPresContext) {
+ mForceNotifyContentfulPaintPresContexts.AppendElement(aPresContext);
+}
+
+void nsRefreshDriver::FlushForceNotifyContentfulPaintPresContext() {
+ while (!mForceNotifyContentfulPaintPresContexts.IsEmpty()) {
+ WeakPtr<nsPresContext> presContext =
+ mForceNotifyContentfulPaintPresContexts.PopLastElement();
+ if (presContext) {
+ presContext->NotifyContentfulPaint();
+ }
+ }
+}
+
+void nsRefreshDriver::RunDelayedEventsSoon() {
+ // Place entries for delayed events into their corresponding normal list,
+ // and schedule a refresh. When these delayed events run, if their document
+ // still has events suppressed then they will be readded to the delayed
+ // events list.
+
+ mScrollEvents.AppendElements(mDelayedScrollEvents);
+ mDelayedScrollEvents.Clear();
+
+ mResizeEventFlushObservers.AppendElements(mDelayedResizeEventFlushObservers);
+ mDelayedResizeEventFlushObservers.Clear();
+
+ EnsureTimerStarted();
+}
+
+bool nsRefreshDriver::CanDoCatchUpTick() {
+ if (mTestControllingRefreshes || !mActiveTimer) {
+ return false;
+ }
+
+ // If we've already ticked for the current timer refresh (or more recently
+ // than that), then we don't need to do any catching up.
+ if (mMostRecentRefresh >= mActiveTimer->MostRecentRefresh()) {
+ return false;
+ }
+
+ if (mTickVsyncTime.IsNull()) {
+ // Don't try to run a catch-up tick before there has been at least one
+ // normal tick. The catch-up tick could negatively affect page load
+ // performance.
+ return false;
+ }
+
+ if (mPresContext && mPresContext->Document()->GetReadyStateEnum() <
+ Document::READYSTATE_COMPLETE) {
+ // Don't try to run a catch-up tick before the page has finished loading.
+ // The catch-up tick could negatively affect page load performance.
+ return false;
+ }
+
+ return true;
+}
+
+bool nsRefreshDriver::CanDoExtraTick() {
+ // Only allow one extra tick per normal vsync tick.
+ if (mAttemptedExtraTickSinceLastVsync) {
+ return false;
+ }
+
+ // If we don't have a timer, or we didn't tick on the timer's
+ // refresh then we can't do an 'extra' tick (but we may still
+ // do a catch up tick).
+ if (!mActiveTimer ||
+ mActiveTimer->MostRecentRefresh() != mMostRecentRefresh) {
+ return false;
+ }
+
+ // Grab the current timestamp before checking the tick hint to be sure
+ // sure that it's equal or smaller than the value used within checking
+ // the tick hint.
+ TimeStamp now = TimeStamp::Now();
+ Maybe<TimeStamp> nextTick = mActiveTimer->GetNextTickHint();
+ int32_t minimumRequiredTime = StaticPrefs::layout_extra_tick_minimum_ms();
+ // If there's less than 4 milliseconds until the next tick, it's probably
+ // not worth trying to catch up.
+ if (minimumRequiredTime < 0 || !nextTick ||
+ (*nextTick - now) < TimeDuration::FromMilliseconds(minimumRequiredTime)) {
+ return false;
+ }
+
+ return true;
+}
+
+void nsRefreshDriver::EnsureTimerStarted(EnsureTimerStartedFlags aFlags) {
+ // FIXME: Bug 1346065: We should also assert the case where we have no
+ // stylo-threads.
+ MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal() || NS_IsMainThread(),
+ "EnsureTimerStarted should be called only when we are not "
+ "in servo traversal or on the main-thread");
+
+ if (mTestControllingRefreshes) return;
+
+ if (!mRefreshTimerStartedCause) {
+ mRefreshTimerStartedCause = profiler_capture_backtrace();
+ }
+
+ // will it already fire, and no other changes needed?
+ if (mActiveTimer && !(aFlags & eForceAdjustTimer)) {
+ // If we're being called from within a user input handler, and we think
+ // there's time to rush an extra tick immediately, then schedule a runnable
+ // to run the extra tick.
+ if (mUserInputProcessingCount && CanDoExtraTick()) {
+ RefPtr<nsRefreshDriver> self = this;
+ NS_DispatchToCurrentThreadQueue(
+ NS_NewRunnableFunction(
+ "RefreshDriver::EnsureTimerStarted::extra",
+ [self]() -> void {
+ // Re-check if we can still do an extra tick, in case anything
+ // changed while the runnable was pending.
+ if (self->CanDoExtraTick()) {
+ PROFILER_MARKER_UNTYPED("ExtraRefreshDriverTick", GRAPHICS);
+ LOG("[%p] Doing extra tick for user input", self.get());
+ self->mAttemptedExtraTickSinceLastVsync = true;
+ self->Tick(self->mActiveTimer->MostRecentRefreshVsyncId(),
+ self->mActiveTimer->MostRecentRefresh(),
+ IsExtraTick::Yes);
+ }
+ }),
+ EventQueuePriority::Vsync);
+ }
+ return;
+ }
+
+ if (IsFrozen() || !mPresContext) {
+ // If we don't want to start it now, or we've been disconnected.
+ StopTimer();
+ return;
+ }
+
+ if (mPresContext->Document()->IsBeingUsedAsImage()) {
+ // Image documents receive ticks from clients' refresh drivers.
+ // XXXdholbert Exclude SVG-in-opentype fonts from this optimization, until
+ // they receive refresh-driver ticks from their client docs (bug 1107252).
+ if (!mPresContext->Document()->IsSVGGlyphsDocument()) {
+ MOZ_ASSERT(!mActiveTimer,
+ "image doc refresh driver should never have its own timer");
+ return;
+ }
+ }
+
+ // We got here because we're either adjusting the time *or* we're
+ // starting it for the first time. Add to the right timer,
+ // prehaps removing it from a previously-set one.
+ RefreshDriverTimer* newTimer = ChooseTimer();
+ if (newTimer != mActiveTimer) {
+ if (mActiveTimer) mActiveTimer->RemoveRefreshDriver(this);
+ mActiveTimer = newTimer;
+ mActiveTimer->AddRefreshDriver(this);
+
+ if (!mHasStartedTimerAtLeastOnce) {
+ mHasStartedTimerAtLeastOnce = true;
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ nsCString text = "initial timer start "_ns;
+ if (mPresContext->Document()->GetDocumentURI()) {
+ text.Append(nsContentUtils::TruncatedURLForDisplay(
+ mPresContext->Document()->GetDocumentURI()));
+ }
+
+ PROFILER_MARKER_TEXT("nsRefreshDriver", LAYOUT,
+ MarkerOptions(MarkerInnerWindowIdFromDocShell(
+ GetDocShell(mPresContext))),
+ text);
+ }
+ }
+
+ // If the timer has ticked since we last ticked, consider doing a 'catch-up'
+ // tick immediately.
+ if (CanDoCatchUpTick()) {
+ RefPtr<nsRefreshDriver> self = this;
+ NS_DispatchToCurrentThreadQueue(
+ NS_NewRunnableFunction(
+ "RefreshDriver::EnsureTimerStarted::catch-up",
+ [self]() -> void {
+ // Re-check if we can still do a catch-up, in case anything
+ // changed while the runnable was pending.
+ if (self->CanDoCatchUpTick()) {
+ LOG("[%p] Doing catch up tick", self.get());
+ self->Tick(self->mActiveTimer->MostRecentRefreshVsyncId(),
+ self->mActiveTimer->MostRecentRefresh());
+ }
+ }),
+ EventQueuePriority::Vsync);
+ }
+ }
+
+ // When switching from an inactive timer to an active timer, the root
+ // refresh driver is skipped due to being set to the content refresh
+ // driver's timestamp. In case of EnsureTimerStarted is called from
+ // ScheduleViewManagerFlush, we should avoid this behavior to flush
+ // a paint in the same tick on the root refresh driver.
+ if (aFlags & eNeverAdjustTimer) {
+ return;
+ }
+
+ // Since the different timers are sampled at different rates, when switching
+ // timers, the most recent refresh of the new timer may be *before* the
+ // most recent refresh of the old timer.
+ // If we are restoring the refresh driver from test control, the time is
+ // expected to go backwards (see bug 1043078), otherwise we just keep the most
+ // recent tick of this driver (which may be older than the most recent tick of
+ // the timer).
+ if (!(aFlags & eAllowTimeToGoBackwards)) {
+ return;
+ }
+
+ if (mMostRecentRefresh != mActiveTimer->MostRecentRefresh()) {
+ mMostRecentRefresh = mActiveTimer->MostRecentRefresh();
+
+ for (nsATimerAdjustmentObserver* obs :
+ mTimerAdjustmentObservers.EndLimitedRange()) {
+ obs->NotifyTimerAdjusted(mMostRecentRefresh);
+ }
+ }
+}
+
+void nsRefreshDriver::StopTimer() {
+ if (!mActiveTimer) return;
+
+ mActiveTimer->RemoveRefreshDriver(this);
+ mActiveTimer = nullptr;
+ mRefreshTimerStartedCause = nullptr;
+}
+
+uint32_t nsRefreshDriver::ObserverCount() const {
+ uint32_t sum = 0;
+ for (const ObserverArray& array : mObservers) {
+ sum += array.Length();
+ }
+
+ // Even while throttled, we need to process layout and style changes. Style
+ // changes can trigger transitions which fire events when they complete, and
+ // layout changes can affect media queries on child documents, triggering
+ // style changes, etc.
+ sum += mAnimationEventFlushObservers.Length();
+ sum += mResizeEventFlushObservers.Length();
+ sum += mStyleFlushObservers.Length();
+ sum += mLayoutFlushObservers.Length();
+ sum += mPendingFullscreenEvents.Length();
+ sum += mFrameRequestCallbackDocs.Length();
+ sum += mThrottledFrameRequestCallbackDocs.Length();
+ sum += mViewManagerFlushIsPending;
+ sum += mEarlyRunners.Length();
+ sum += mTimerAdjustmentObservers.Length();
+ sum += mAutoFocusFlushDocuments.Length();
+ return sum;
+}
+
+bool nsRefreshDriver::HasObservers() const {
+ for (const ObserverArray& array : mObservers) {
+ if (!array.IsEmpty()) {
+ return true;
+ }
+ }
+
+ // We should NOT count mTimerAdjustmentObservers here since this method is
+ // used to determine whether or not to stop the timer or re-start it and timer
+ // adjustment observers should not influence timer starting or stopping.
+ return (mViewManagerFlushIsPending && !mThrottled) ||
+ !mStyleFlushObservers.IsEmpty() || !mLayoutFlushObservers.IsEmpty() ||
+ !mAnimationEventFlushObservers.IsEmpty() ||
+ !mResizeEventFlushObservers.IsEmpty() ||
+ !mPendingFullscreenEvents.IsEmpty() ||
+ !mFrameRequestCallbackDocs.IsEmpty() ||
+ !mThrottledFrameRequestCallbackDocs.IsEmpty() ||
+ !mAutoFocusFlushDocuments.IsEmpty() || !mEarlyRunners.IsEmpty();
+}
+
+void nsRefreshDriver::AppendObserverDescriptionsToString(
+ nsACString& aStr) const {
+ for (const ObserverArray& array : mObservers) {
+ for (const auto& observer : array.EndLimitedRange()) {
+ aStr.AppendPrintf("%s [%s], ", observer.mDescription,
+ kFlushTypeNames[observer.mFlushType]);
+ }
+ }
+ if (mViewManagerFlushIsPending && !mThrottled) {
+ aStr.AppendLiteral("View manager flush pending, ");
+ }
+ if (!mAnimationEventFlushObservers.IsEmpty()) {
+ aStr.AppendPrintf("%zux Animation event flush observer, ",
+ mAnimationEventFlushObservers.Length());
+ }
+ if (!mResizeEventFlushObservers.IsEmpty()) {
+ aStr.AppendPrintf("%zux Resize event flush observer, ",
+ mResizeEventFlushObservers.Length());
+ }
+ if (!mStyleFlushObservers.IsEmpty()) {
+ aStr.AppendPrintf("%zux Style flush observer, ",
+ mStyleFlushObservers.Length());
+ }
+ if (!mLayoutFlushObservers.IsEmpty()) {
+ aStr.AppendPrintf("%zux Layout flush observer, ",
+ mLayoutFlushObservers.Length());
+ }
+ if (!mPendingFullscreenEvents.IsEmpty()) {
+ aStr.AppendPrintf("%zux Pending fullscreen event, ",
+ mPendingFullscreenEvents.Length());
+ }
+ if (!mFrameRequestCallbackDocs.IsEmpty()) {
+ aStr.AppendPrintf("%zux Frame request callback doc, ",
+ mFrameRequestCallbackDocs.Length());
+ }
+ if (!mThrottledFrameRequestCallbackDocs.IsEmpty()) {
+ aStr.AppendPrintf("%zux Throttled frame request callback doc, ",
+ mThrottledFrameRequestCallbackDocs.Length());
+ }
+ if (!mAutoFocusFlushDocuments.IsEmpty()) {
+ aStr.AppendPrintf("%zux AutoFocus flush doc, ",
+ mAutoFocusFlushDocuments.Length());
+ }
+ if (!mEarlyRunners.IsEmpty()) {
+ aStr.AppendPrintf("%zux Early runner, ", mEarlyRunners.Length());
+ }
+ // Remove last ", "
+ aStr.Truncate(aStr.Length() - 2);
+}
+
+bool nsRefreshDriver::HasImageRequests() const {
+ for (const auto& data : mStartTable.Values()) {
+ if (!data->mEntries.IsEmpty()) {
+ return true;
+ }
+ }
+
+ return !mRequests.IsEmpty();
+}
+
+auto nsRefreshDriver::GetReasonsToTick() const -> TickReasons {
+ TickReasons reasons = TickReasons::eNone;
+ if (HasObservers()) {
+ reasons |= TickReasons::eHasObservers;
+ }
+ if (HasImageRequests() && !mThrottled) {
+ reasons |= TickReasons::eHasImageRequests;
+ }
+ if (mNeedToUpdateIntersectionObservations) {
+ reasons |= TickReasons::eNeedsToUpdateIntersectionObservations;
+ }
+ if (mNeedToUpdateContentRelevancy) {
+ reasons |= TickReasons::eNeedsToUpdateContentRelevancy;
+ }
+ if (!mVisualViewportResizeEvents.IsEmpty()) {
+ reasons |= TickReasons::eHasVisualViewportResizeEvents;
+ }
+ if (!mScrollEvents.IsEmpty()) {
+ reasons |= TickReasons::eHasScrollEvents;
+ }
+ if (!mVisualViewportScrollEvents.IsEmpty()) {
+ reasons |= TickReasons::eHasVisualViewportScrollEvents;
+ }
+ if (mPresContext && mPresContext->IsRoot() &&
+ mPresContext->NeedsMoreTicksForUserInput()) {
+ reasons |= TickReasons::eRootNeedsMoreTicksForUserInput;
+ }
+ return reasons;
+}
+
+void nsRefreshDriver::AppendTickReasonsToString(TickReasons aReasons,
+ nsACString& aStr) const {
+ if (aReasons == TickReasons::eNone) {
+ aStr.AppendLiteral(" <none>");
+ return;
+ }
+
+ if (aReasons & TickReasons::eHasObservers) {
+ aStr.AppendLiteral(" HasObservers (");
+ AppendObserverDescriptionsToString(aStr);
+ aStr.AppendLiteral(")");
+ }
+ if (aReasons & TickReasons::eHasImageRequests) {
+ aStr.AppendLiteral(" HasImageAnimations");
+ }
+ if (aReasons & TickReasons::eNeedsToUpdateIntersectionObservations) {
+ aStr.AppendLiteral(" NeedsToUpdateIntersectionObservations");
+ }
+ if (aReasons & TickReasons::eNeedsToUpdateContentRelevancy) {
+ aStr.AppendLiteral(" NeedsToUpdateContentRelevancy");
+ }
+ if (aReasons & TickReasons::eHasVisualViewportResizeEvents) {
+ aStr.AppendLiteral(" HasVisualViewportResizeEvents");
+ }
+ if (aReasons & TickReasons::eHasScrollEvents) {
+ aStr.AppendLiteral(" HasScrollEvents");
+ }
+ if (aReasons & TickReasons::eHasVisualViewportScrollEvents) {
+ aStr.AppendLiteral(" HasVisualViewportScrollEvents");
+ }
+ if (aReasons & TickReasons::eRootNeedsMoreTicksForUserInput) {
+ aStr.AppendLiteral(" RootNeedsMoreTicksForUserInput");
+ }
+}
+
+bool nsRefreshDriver::
+ ShouldKeepTimerRunningWhileWaitingForFirstContentfulPaint() {
+ // On top level content pages keep the timer running initially so that we
+ // paint the page soon enough.
+ if (mThrottled || mTestControllingRefreshes || !XRE_IsContentProcess() ||
+ !mPresContext->Document()->IsTopLevelContentDocument() ||
+ mPresContext->Document()->IsInitialDocument() ||
+ gfxPlatform::IsInLayoutAsapMode() ||
+ mPresContext->HadFirstContentfulPaint() ||
+ mPresContext->Document()->GetReadyStateEnum() ==
+ Document::READYSTATE_COMPLETE) {
+ return false;
+ }
+ if (mBeforeFirstContentfulPaintTimerRunningLimit.IsNull()) {
+ // Don't let the timer to run forever, so limit to 4s for now.
+ mBeforeFirstContentfulPaintTimerRunningLimit =
+ TimeStamp::Now() + TimeDuration::FromSeconds(4.0f);
+ }
+
+ return TimeStamp::Now() <= mBeforeFirstContentfulPaintTimerRunningLimit;
+}
+
+bool nsRefreshDriver::ShouldKeepTimerRunningAfterPageLoad() {
+ if (mHasExceededAfterLoadTickPeriod ||
+ !StaticPrefs::layout_keep_ticking_after_load_ms() || mThrottled ||
+ mTestControllingRefreshes || !XRE_IsContentProcess() ||
+ !mPresContext->Document()->IsTopLevelContentDocument() ||
+ TaskController::Get()->PendingMainthreadTaskCountIncludingSuspended() ==
+ 0 ||
+ gfxPlatform::IsInLayoutAsapMode()) {
+ // Make the next check faster.
+ mHasExceededAfterLoadTickPeriod = true;
+ return false;
+ }
+
+ nsPIDOMWindowInner* innerWindow = mPresContext->Document()->GetInnerWindow();
+ if (!innerWindow) {
+ return false;
+ }
+ auto* perf =
+ static_cast<PerformanceMainThread*>(innerWindow->GetPerformance());
+ if (!perf) {
+ return false;
+ }
+ nsDOMNavigationTiming* timing = perf->GetDOMTiming();
+ if (!timing) {
+ return false;
+ }
+ TimeStamp loadend = timing->LoadEventEnd();
+ if (!loadend) {
+ return false;
+ }
+ // Keep ticking after the page load for some time.
+ const bool retval =
+ (loadend + TimeDuration::FromMilliseconds(
+ StaticPrefs::layout_keep_ticking_after_load_ms())) >
+ TimeStamp::Now();
+ if (!retval) {
+ mHasExceededAfterLoadTickPeriod = true;
+ }
+ return retval;
+}
+
+nsRefreshDriver::ObserverArray& nsRefreshDriver::ArrayFor(
+ FlushType aFlushType) {
+ switch (aFlushType) {
+ case FlushType::Event:
+ return mObservers[0];
+ case FlushType::Style:
+ case FlushType::Frames:
+ return mObservers[1];
+ case FlushType::Layout:
+ return mObservers[2];
+ case FlushType::Display:
+ return mObservers[3];
+ default:
+ MOZ_CRASH("We don't track refresh observers for this flush type");
+ }
+}
+
+/*
+ * nsITimerCallback implementation
+ */
+
+void nsRefreshDriver::DoTick() {
+ MOZ_ASSERT(!IsFrozen(), "Why are we notified while frozen?");
+ MOZ_ASSERT(mPresContext, "Why are we notified after disconnection?");
+ MOZ_ASSERT(!nsContentUtils::GetCurrentJSContext(),
+ "Shouldn't have a JSContext on the stack");
+
+ if (mTestControllingRefreshes) {
+ Tick(VsyncId(), mMostRecentRefresh);
+ } else {
+ Tick(VsyncId(), TimeStamp::Now());
+ }
+}
+
+struct DocumentFrameCallbacks {
+ explicit DocumentFrameCallbacks(Document* aDocument) : mDocument(aDocument) {}
+
+ RefPtr<Document> mDocument;
+ nsTArray<FrameRequest> mCallbacks;
+};
+
+static bool HasPendingAnimations(PresShell* aPresShell) {
+ Document* doc = aPresShell->GetDocument();
+ if (!doc) {
+ return false;
+ }
+
+ PendingAnimationTracker* tracker = doc->GetPendingAnimationTracker();
+ return tracker && tracker->HasPendingAnimations();
+}
+
+/**
+ * Return a list of all the child docShells in a given root docShell that are
+ * visible and are recording markers for the profilingTimeline
+ */
+static void GetProfileTimelineSubDocShells(nsDocShell* aRootDocShell,
+ nsTArray<nsDocShell*>& aShells) {
+ if (!aRootDocShell) {
+ return;
+ }
+
+ if (TimelineConsumers::IsEmpty()) {
+ return;
+ }
+
+ RefPtr<BrowsingContext> bc = aRootDocShell->GetBrowsingContext();
+ if (!bc) {
+ return;
+ }
+
+ bc->PostOrderWalk([&](BrowsingContext* aContext) {
+ if (!aContext->IsActive()) {
+ return;
+ }
+
+ nsDocShell* shell = nsDocShell::Cast(aContext->GetDocShell());
+ if (!shell || !shell->GetRecordProfileTimelineMarkers()) {
+ // This process isn't painting OOP iframes so we ignore
+ // docshells that are OOP.
+ return;
+ }
+
+ aShells.AppendElement(shell);
+ });
+}
+
+static void TakeFrameRequestCallbacksFrom(
+ Document* aDocument, nsTArray<DocumentFrameCallbacks>& aTarget) {
+ aTarget.AppendElement(aDocument);
+ aDocument->TakeFrameRequestCallbacks(aTarget.LastElement().mCallbacks);
+}
+
+void nsRefreshDriver::ScheduleAutoFocusFlush(Document* aDocument) {
+ MOZ_ASSERT(!mAutoFocusFlushDocuments.Contains(aDocument));
+ mAutoFocusFlushDocuments.AppendElement(aDocument);
+ EnsureTimerStarted();
+}
+
+void nsRefreshDriver::FlushAutoFocusDocuments() {
+ nsTArray<RefPtr<Document>> docs(std::move(mAutoFocusFlushDocuments));
+
+ for (const auto& doc : docs) {
+ MOZ_KnownLive(doc)->FlushAutoFocusCandidates();
+ }
+}
+
+void nsRefreshDriver::MaybeIncreaseMeasuredTicksSinceLoading() {
+ if (mPresContext && mPresContext->IsRoot()) {
+ mPresContext->MaybeIncreaseMeasuredTicksSinceLoading();
+ }
+}
+
+void nsRefreshDriver::CancelFlushAutoFocus(Document* aDocument) {
+ mAutoFocusFlushDocuments.RemoveElement(aDocument);
+}
+
+// https://fullscreen.spec.whatwg.org/#run-the-fullscreen-steps
+void nsRefreshDriver::RunFullscreenSteps() {
+ // Swap out the current pending events
+ nsTArray<UniquePtr<PendingFullscreenEvent>> pendings(
+ std::move(mPendingFullscreenEvents));
+ for (UniquePtr<PendingFullscreenEvent>& event : pendings) {
+ event->Dispatch();
+ }
+}
+
+void nsRefreshDriver::UpdateIntersectionObservations(TimeStamp aNowTime) {
+ AUTO_PROFILER_LABEL_RELEVANT_FOR_JS("Compute intersections", LAYOUT);
+
+ AutoTArray<RefPtr<Document>, 32> documents;
+
+ if (mPresContext->Document()->HasIntersectionObservers()) {
+ documents.AppendElement(mPresContext->Document());
+ }
+
+ mPresContext->Document()->CollectDescendantDocuments(
+ documents, [](const Document* document) -> bool {
+ return document->HasIntersectionObservers();
+ });
+
+ for (const auto& doc : documents) {
+ doc->UpdateIntersectionObservations(aNowTime);
+ doc->ScheduleIntersectionObserverNotification();
+ }
+
+ mNeedToUpdateIntersectionObservations = false;
+}
+
+void nsRefreshDriver::UpdateRelevancyOfContentVisibilityAutoFrames() {
+ if (!mNeedToUpdateContentRelevancy) {
+ return;
+ }
+
+ if (RefPtr<PresShell> topLevelPresShell = mPresContext->GetPresShell()) {
+ topLevelPresShell->UpdateRelevancyOfContentVisibilityAutoFrames();
+ }
+
+ mPresContext->Document()->EnumerateSubDocuments([](Document& aSubDoc) {
+ if (PresShell* presShell = aSubDoc.GetPresShell()) {
+ presShell->UpdateRelevancyOfContentVisibilityAutoFrames();
+ }
+ return CallState::Continue;
+ });
+
+ mNeedToUpdateContentRelevancy = false;
+}
+
+void nsRefreshDriver::DispatchAnimationEvents() {
+ if (!mPresContext) {
+ return;
+ }
+
+ // Hold all AnimationEventDispatcher in mAnimationEventFlushObservers as
+ // a RefPtr<> array since each AnimationEventDispatcher might be destroyed
+ // during processing the previous dispatcher.
+ AutoTArray<RefPtr<AnimationEventDispatcher>, 16> dispatchers;
+ dispatchers.AppendElements(mAnimationEventFlushObservers);
+ mAnimationEventFlushObservers.Clear();
+
+ for (auto& dispatcher : dispatchers) {
+ dispatcher->DispatchEvents();
+ }
+}
+
+void nsRefreshDriver::RunFrameRequestCallbacks(TimeStamp aNowTime) {
+ // Grab all of our frame request callbacks up front.
+ nsTArray<DocumentFrameCallbacks> frameRequestCallbacks(
+ mFrameRequestCallbackDocs.Length() +
+ mThrottledFrameRequestCallbackDocs.Length());
+
+ // First, grab throttled frame request callbacks.
+ {
+ nsTArray<Document*> docsToRemove;
+
+ // We always tick throttled frame requests if the entire refresh driver is
+ // throttled, because in that situation throttled frame requests tick at the
+ // same frequency as non-throttled frame requests.
+ bool tickThrottledFrameRequests = mThrottled;
+
+ if (!tickThrottledFrameRequests &&
+ aNowTime >= mNextThrottledFrameRequestTick) {
+ mNextThrottledFrameRequestTick =
+ aNowTime + mThrottledFrameRequestInterval;
+ tickThrottledFrameRequests = true;
+ }
+
+ for (Document* doc : mThrottledFrameRequestCallbackDocs) {
+ if (tickThrottledFrameRequests) {
+ // We're ticking throttled documents, so grab this document's requests.
+ // We don't bother appending to docsToRemove because we're going to
+ // clear mThrottledFrameRequestCallbackDocs anyway.
+ TakeFrameRequestCallbacksFrom(doc, frameRequestCallbacks);
+ } else if (!doc->ShouldThrottleFrameRequests()) {
+ // This document is no longer throttled, so grab its requests even
+ // though we're not ticking throttled frame requests right now. If
+ // this is the first unthrottled document with frame requests, we'll
+ // enter high precision mode the next time the callback is scheduled.
+ TakeFrameRequestCallbacksFrom(doc, frameRequestCallbacks);
+ docsToRemove.AppendElement(doc);
+ }
+ }
+
+ // Remove all the documents we're ticking from
+ // mThrottledFrameRequestCallbackDocs so they can be readded as needed.
+ if (tickThrottledFrameRequests) {
+ mThrottledFrameRequestCallbackDocs.Clear();
+ } else {
+ // XXX(seth): We're using this approach to avoid concurrent modification
+ // of mThrottledFrameRequestCallbackDocs. docsToRemove usually has either
+ // zero elements or a very small number, so this should be OK in practice.
+ for (Document* doc : docsToRemove) {
+ mThrottledFrameRequestCallbackDocs.RemoveElement(doc);
+ }
+ }
+ }
+
+ // Now grab unthrottled frame request callbacks.
+ for (Document* doc : mFrameRequestCallbackDocs) {
+ TakeFrameRequestCallbacksFrom(doc, frameRequestCallbacks);
+ }
+
+ // Reset mFrameRequestCallbackDocs so they can be readded as needed.
+ mFrameRequestCallbackDocs.Clear();
+
+ if (!frameRequestCallbacks.IsEmpty()) {
+ AUTO_PROFILER_TRACING_MARKER_DOCSHELL("Paint",
+ "requestAnimationFrame callbacks",
+ GRAPHICS, GetDocShell(mPresContext));
+ for (const DocumentFrameCallbacks& docCallbacks : frameRequestCallbacks) {
+ TimeStamp startTime = TimeStamp::Now();
+
+ // XXXbz Bug 863140: GetInnerWindow can return the outer
+ // window in some cases.
+ nsPIDOMWindowInner* innerWindow =
+ docCallbacks.mDocument->GetInnerWindow();
+ DOMHighResTimeStamp timeStamp = 0;
+ if (innerWindow) {
+ if (Performance* perf = innerWindow->GetPerformance()) {
+ timeStamp = perf->TimeStampToDOMHighResForRendering(aNowTime);
+ }
+ // else window is partially torn down already
+ }
+ for (auto& callback : docCallbacks.mCallbacks) {
+ if (docCallbacks.mDocument->IsCanceledFrameRequestCallback(
+ callback.mHandle)) {
+ continue;
+ }
+
+ nsCOMPtr<nsIGlobalObject> global(innerWindow ? innerWindow->AsGlobal()
+ : nullptr);
+ CallbackDebuggerNotificationGuard guard(
+ global, DebuggerNotificationType::RequestAnimationFrameCallback);
+
+ // MOZ_KnownLive is OK, because the stack array frameRequestCallbacks
+ // keeps callback alive and the mCallback strong reference can't be
+ // mutated by the call.
+ LogFrameRequestCallback::Run run(callback.mCallback);
+ MOZ_KnownLive(callback.mCallback)->Call(timeStamp);
+ }
+
+ if (docCallbacks.mDocument->GetReadyStateEnum() ==
+ Document::READYSTATE_COMPLETE) {
+ Telemetry::AccumulateTimeDelta(
+ Telemetry::PERF_REQUEST_ANIMATION_CALLBACK_NON_PAGELOAD_MS,
+ startTime, TimeStamp::Now());
+ } else {
+ Telemetry::AccumulateTimeDelta(
+ Telemetry::PERF_REQUEST_ANIMATION_CALLBACK_PAGELOAD_MS, startTime,
+ TimeStamp::Now());
+ }
+ }
+ }
+}
+
+static StaticAutoPtr<AutoTArray<RefPtr<Task>, 8>> sPendingIdleTasks;
+
+void nsRefreshDriver::DispatchIdleTaskAfterTickUnlessExists(Task* aTask) {
+ if (!sPendingIdleTasks) {
+ sPendingIdleTasks = new AutoTArray<RefPtr<Task>, 8>();
+ } else {
+ if (sPendingIdleTasks->Contains(aTask)) {
+ return;
+ }
+ }
+
+ sPendingIdleTasks->AppendElement(aTask);
+}
+
+void nsRefreshDriver::CancelIdleTask(Task* aTask) {
+ if (!sPendingIdleTasks) {
+ return;
+ }
+
+ sPendingIdleTasks->RemoveElement(aTask);
+
+ if (sPendingIdleTasks->IsEmpty()) {
+ sPendingIdleTasks = nullptr;
+ }
+}
+
+static CallState ReduceAnimations(Document& aDocument) {
+ if (nsPresContext* pc = aDocument.GetPresContext()) {
+ if (pc->EffectCompositor()->NeedsReducing()) {
+ pc->EffectCompositor()->ReduceAnimations();
+ }
+ }
+ aDocument.EnumerateSubDocuments(ReduceAnimations);
+ return CallState::Continue;
+}
+
+bool nsRefreshDriver::ShouldStopActivityGracePeriod() const {
+ MOZ_ASSERT(mIsGrantingActivityGracePeriod);
+ return TimeStamp::Now() - mActivityGracePeriodStart >=
+ TimeDuration::FromMilliseconds(
+ StaticPrefs::layout_oopif_activity_grace_period_ms());
+}
+
+bool nsRefreshDriver::TickObserverArray(uint32_t aIdx, TimeStamp aNowTime) {
+ for (RefPtr<nsARefreshObserver> obs : mObservers[aIdx].EndLimitedRange()) {
+ obs->WillRefresh(aNowTime);
+
+ if (!mPresContext || !mPresContext->GetPresShell()) {
+ return false;
+ }
+ }
+
+ // Any animation timelines updated above may cause animations to queue
+ // Promise resolution microtasks. We shouldn't run these, however, until we
+ // have fully updated the animation state.
+ //
+ // As per the "update animations and send events" procedure[1], we should
+ // remove replaced animations and then run these microtasks before
+ // dispatching the corresponding animation events.
+ //
+ // [1]
+ // https://drafts.csswg.org/web-animations-1/#update-animations-and-send-events
+ if (aIdx == 1) {
+ // This is the FlushType::Style case.
+ {
+ nsAutoMicroTask mt;
+ ReduceAnimations(*mPresContext->Document());
+ }
+
+ // Check if running the microtask checkpoint caused the pres context to
+ // be destroyed.
+ if (!mPresContext || !mPresContext->GetPresShell()) {
+ return false;
+ }
+
+ FlushAutoFocusDocuments();
+ DispatchScrollEvents();
+ DispatchVisualViewportScrollEvents();
+ DispatchAnimationEvents();
+ RunFullscreenSteps();
+ RunFrameRequestCallbacks(aNowTime);
+ MaybeIncreaseMeasuredTicksSinceLoading();
+
+ if (mPresContext && mPresContext->GetPresShell()) {
+ AutoTArray<PresShell*, 16> observers;
+ observers.AppendElements(mStyleFlushObservers);
+ for (uint32_t j = observers.Length();
+ j && mPresContext && mPresContext->GetPresShell(); --j) {
+ // Make sure to not process observers which might have been removed
+ // during previous iterations.
+ PresShell* rawPresShell = observers[j - 1];
+ if (!mStyleFlushObservers.RemoveElement(rawPresShell)) {
+ continue;
+ }
+
+ LogPresShellObserver::Run run(rawPresShell, this);
+
+ RefPtr<PresShell> presShell = rawPresShell;
+ presShell->mObservingStyleFlushes = false;
+ presShell->FlushPendingNotifications(
+ ChangesToFlush(FlushType::Style, false));
+ // Inform the FontFaceSet that we ticked, so that it can resolve its
+ // ready promise if it needs to (though it might still be waiting on
+ // a layout flush).
+ presShell->NotifyFontFaceSetOnRefresh();
+ mNeedToRecomputeVisibility = true;
+
+ // Record the telemetry for events that occurred between ticks.
+ presShell->PingPerTickTelemetry(FlushType::Style);
+ }
+ }
+ } else if (aIdx == 2) {
+ // This is the FlushType::Layout case.
+ AutoTArray<PresShell*, 16> observers;
+ observers.AppendElements(mLayoutFlushObservers);
+ for (uint32_t j = observers.Length();
+ j && mPresContext && mPresContext->GetPresShell(); --j) {
+ // Make sure to not process observers which might have been removed
+ // during previous iterations.
+ PresShell* rawPresShell = observers[j - 1];
+ if (!mLayoutFlushObservers.RemoveElement(rawPresShell)) {
+ continue;
+ }
+
+ LogPresShellObserver::Run run(rawPresShell, this);
+
+ RefPtr<PresShell> presShell = rawPresShell;
+ presShell->mObservingLayoutFlushes = false;
+ presShell->mWasLastReflowInterrupted = false;
+ const auto flushType = HasPendingAnimations(presShell)
+ ? FlushType::Layout
+ : FlushType::InterruptibleLayout;
+ const ChangesToFlush ctf(flushType, false);
+ presShell->FlushPendingNotifications(ctf);
+ if (presShell->FixUpFocus()) {
+ presShell->FlushPendingNotifications(ctf);
+ }
+
+ // Inform the FontFaceSet that we ticked, so that it can resolve its
+ // ready promise if it needs to.
+ presShell->NotifyFontFaceSetOnRefresh();
+ mNeedToRecomputeVisibility = true;
+
+ // Record the telemetry for events that occurred between ticks.
+ presShell->PingPerTickTelemetry(FlushType::Layout);
+ }
+ }
+
+ // The pres context may be destroyed during we do the flushing.
+ if (!mPresContext || !mPresContext->GetPresShell()) {
+ return false;
+ }
+
+ return true;
+}
+
+void nsRefreshDriver::Tick(VsyncId aId, TimeStamp aNowTime,
+ IsExtraTick aIsExtraTick /* = No */) {
+ MOZ_ASSERT(!nsContentUtils::GetCurrentJSContext(),
+ "Shouldn't have a JSContext on the stack");
+
+ // We're either frozen or we were disconnected (likely in the middle
+ // of a tick iteration). Just do nothing here, since our
+ // prescontext went away.
+ if (IsFrozen() || !mPresContext) {
+ return;
+ }
+
+ // We can have a race condition where the vsync timestamp
+ // is before the most recent refresh due to a forced refresh.
+ // The underlying assumption is that the refresh driver tick can only
+ // go forward in time, not backwards. To prevent the refresh
+ // driver from going back in time, just skip this tick and
+ // wait until the next tick.
+ // If this is an 'extra' tick, then we expect it to be using the same
+ // vsync id and timestamp as the original tick, so also allow those.
+ if ((aNowTime <= mMostRecentRefresh) && !mTestControllingRefreshes &&
+ aIsExtraTick == IsExtraTick::No) {
+ return;
+ }
+ auto cleanupInExtraTick = MakeScopeExit([&] { mInNormalTick = false; });
+ mInNormalTick = aIsExtraTick != IsExtraTick::Yes;
+
+ bool isPresentingInVR = false;
+#if defined(MOZ_WIDGET_ANDROID)
+ isPresentingInVR = gfx::VRManagerChild::IsPresenting();
+#endif // defined(MOZ_WIDGET_ANDROID)
+
+ if (!isPresentingInVR && IsWaitingForPaint(aNowTime)) {
+ // In immersive VR mode, we do not get notifications when frames are
+ // presented, so we do not wait for the compositor in that mode.
+
+ // We're currently suspended waiting for earlier Tick's to
+ // be completed (on the Compositor). Mark that we missed the paint
+ // and keep waiting.
+ PROFILER_MARKER_UNTYPED(
+ "RefreshDriverTick waiting for paint", GRAPHICS,
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)));
+ return;
+ }
+
+ const TimeStamp previousRefresh = mMostRecentRefresh;
+ mMostRecentRefresh = aNowTime;
+
+ if (mRootRefresh) {
+ mRootRefresh->RemoveRefreshObserver(this, FlushType::Style);
+ mRootRefresh = nullptr;
+ }
+ mSkippedPaints = false;
+
+ RefPtr<PresShell> presShell = mPresContext->GetPresShell();
+ if (!presShell) {
+ StopTimer();
+ return;
+ }
+
+ TickReasons tickReasons = GetReasonsToTick();
+ if (tickReasons == TickReasons::eNone) {
+ // We no longer have any observers.
+ // Discard composition payloads because there is no paint.
+ mCompositionPayloads.Clear();
+
+ // We don't want to stop the timer when observers are initially
+ // removed, because sometimes observers can be added and removed
+ // often depending on what other things are going on and in that
+ // situation we don't want to thrash our timer. So instead we
+ // wait until we get a Notify() call when we have no observers
+ // before stopping the timer.
+ // On top level content pages keep the timer running initially so that we
+ // paint the page soon enough.
+ if (ShouldKeepTimerRunningWhileWaitingForFirstContentfulPaint()) {
+ PROFILER_MARKER(
+ "RefreshDriverTick waiting for first contentful paint", GRAPHICS,
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)), Tracing,
+ "Paint");
+ } else if (ShouldKeepTimerRunningAfterPageLoad()) {
+ PROFILER_MARKER(
+ "RefreshDriverTick after page load", GRAPHICS,
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)), Tracing,
+ "Paint");
+ } else {
+ StopTimer();
+ }
+ return;
+ }
+
+ if (StaticPrefs::layout_skip_ticks_while_page_suspended()) {
+ Document* doc = mPresContext->Document();
+ nsPIDOMWindowInner* win = doc ? doc->GetInnerWindow() : nullptr;
+ // Synchronous DOM operations mark the document being in such. Window's
+ // suspend can be used also by external code. So we check here them both
+ // in order to limit rAF skipping to only those synchronous DOM APIs which
+ // also suspend window.
+ if (win && win->IsSuspended() && doc->IsInSyncOperation()) {
+ return;
+ }
+ }
+
+ // Potentially go back to throttled after the grace period is done.
+ if (MOZ_UNLIKELY(mIsGrantingActivityGracePeriod) &&
+ ShouldStopActivityGracePeriod()) {
+ mIsGrantingActivityGracePeriod = false;
+ UpdateThrottledState();
+ }
+
+ AUTO_PROFILER_LABEL_RELEVANT_FOR_JS("RefreshDriver tick", LAYOUT);
+
+ nsAutoCString profilerStr;
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ profilerStr.AppendLiteral("Tick reasons:");
+ AppendTickReasonsToString(tickReasons, profilerStr);
+ }
+ AUTO_PROFILER_MARKER_TEXT(
+ "RefreshDriverTick", GRAPHICS,
+ MarkerOptions(
+ MarkerStack::TakeBacktrace(std::move(mRefreshTimerStartedCause)),
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext))),
+ profilerStr);
+
+ mResizeSuppressed = false;
+
+ bool oldInRefresh = mInRefresh;
+ auto restoreInRefresh = MakeScopeExit([&] { mInRefresh = oldInRefresh; });
+ mInRefresh = true;
+
+ AutoRestore<TimeStamp> restoreTickStart(mTickStart);
+ mTickStart = TimeStamp::Now();
+ mTickVsyncId = aId;
+ mTickVsyncTime = aNowTime;
+
+ gfxPlatform::GetPlatform()->SchedulePaintIfDeviceReset();
+
+ FlushForceNotifyContentfulPaintPresContext();
+
+ AutoTArray<nsCOMPtr<nsIRunnable>, 16> earlyRunners = std::move(mEarlyRunners);
+ for (auto& runner : earlyRunners) {
+ runner->Run();
+ // Early runners might destroy this pres context.
+ if (!mPresContext || !mPresContext->GetPresShell()) {
+ StopTimer();
+ return;
+ }
+ }
+
+ // Resize events should be fired before layout flushes or
+ // calling animation frame callbacks.
+ AutoTArray<RefPtr<PresShell>, 16> observers;
+ observers.AppendElements(mResizeEventFlushObservers);
+ for (RefPtr<PresShell>& presShell : Reversed(observers)) {
+ if (!mPresContext || !mPresContext->GetPresShell()) {
+ StopTimer();
+ return;
+ }
+ // Make sure to not process observers which might have been removed
+ // during previous iterations.
+ if (!mResizeEventFlushObservers.RemoveElement(presShell)) {
+ continue;
+ }
+ // MOZ_KnownLive because 'observers' is guaranteed to
+ // keep it alive.
+ //
+ // Fixing https://bugzilla.mozilla.org/show_bug.cgi?id=1620312 on its own
+ // won't help here, because 'observers' is non-const and we have the
+ // Reversed() going on too...
+ MOZ_KnownLive(presShell)->FireResizeEvent();
+ }
+ DispatchVisualViewportResizeEvents();
+
+ /*
+ * The timer holds a reference to |this| while calling |Notify|.
+ * However, implementations of |WillRefresh| are permitted to destroy
+ * the pres context, which will cause our |mPresContext| to become
+ * null. If this happens, TickObserverArray will tell us by returning
+ * false, and we must stop notifying observers.
+ */
+ // XXXdholbert This would be cleaner as a loop, but for now it's helpful to
+ // have these calls separated out, so that we can figure out which
+ // observer-category is involved from the backtrace of crash reports.
+ bool keepGoing = true;
+ MOZ_ASSERT(ArrayLength(mObservers) == 4,
+ "if this changes, then we need to add or remove calls to "
+ "TickObserverArray below");
+ keepGoing = keepGoing && TickObserverArray(0, aNowTime);
+ keepGoing = keepGoing && TickObserverArray(1, aNowTime);
+ keepGoing = keepGoing && TickObserverArray(2, aNowTime);
+ keepGoing = keepGoing && TickObserverArray(3, aNowTime);
+ if (!keepGoing) {
+ StopTimer();
+ return;
+ }
+
+ // Recompute approximate frame visibility if it's necessary and enough time
+ // has passed since the last time we did it.
+ if (mNeedToRecomputeVisibility && !mThrottled &&
+ aNowTime >= mNextRecomputeVisibilityTick &&
+ !presShell->IsPaintingSuppressed()) {
+ mNextRecomputeVisibilityTick = aNowTime + mMinRecomputeVisibilityInterval;
+ mNeedToRecomputeVisibility = false;
+
+ presShell->ScheduleApproximateFrameVisibilityUpdateNow();
+ }
+
+ // Update any popups that may need to be moved or hidden due to their
+ // anchor changing.
+ if (nsXULPopupManager* pm = nsXULPopupManager::GetInstance()) {
+ pm->UpdatePopupPositions(this);
+ }
+
+ // Update the relevancy of the content of any `content-visibility: auto`
+ // elements. The specification says: "Specifically, such changes will
+ // take effect between steps 13 and 14 of Update the Rendering step of
+ // the Processing Model (between “run the animation frame callbacks” and
+ // “run the update intersection observations steps”)."
+ // https://drafts.csswg.org/css-contain/#cv-notes
+ UpdateRelevancyOfContentVisibilityAutoFrames();
+
+ UpdateIntersectionObservations(aNowTime);
+
+ UpdateAnimatedImages(previousRefresh, aNowTime);
+
+ bool dispatchTasksAfterTick = false;
+ if (mViewManagerFlushIsPending && !mThrottled) {
+ nsCString transactionId;
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ transactionId.AppendLiteral("Transaction ID: ");
+ transactionId.AppendInt((uint64_t)mNextTransactionId);
+ }
+ AUTO_PROFILER_MARKER_TEXT(
+ "ViewManagerFlush", GRAPHICS,
+ MarkerOptions(
+ MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)),
+ MarkerStack::TakeBacktrace(std::move(mViewManagerFlushCause))),
+ transactionId);
+
+ // Forward our composition payloads to the layer manager.
+ if (!mCompositionPayloads.IsEmpty()) {
+ nsCOMPtr<nsIWidget> widget = mPresContext->GetRootWidget();
+ WindowRenderer* renderer = widget ? widget->GetWindowRenderer() : nullptr;
+ if (renderer && renderer->AsWebRender()) {
+ renderer->AsWebRender()->RegisterPayloads(mCompositionPayloads);
+ }
+ mCompositionPayloads.Clear();
+ }
+
+ nsTArray<nsDocShell*> profilingDocShells;
+ GetProfileTimelineSubDocShells(GetDocShell(mPresContext),
+ profilingDocShells);
+ for (nsDocShell* docShell : profilingDocShells) {
+ // For the sake of the profile timeline's simplicity, this is flagged as
+ // paint even if it includes creating display lists
+ MOZ_ASSERT(TimelineConsumers::HasConsumer(docShell));
+ TimelineConsumers::AddMarkerForDocShell(docShell, "Paint",
+ MarkerTracingType::START);
+ }
+
+#ifdef MOZ_DUMP_PAINTING
+ if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
+ printf_stderr("Starting ProcessPendingUpdates\n");
+ }
+#endif
+
+ mViewManagerFlushIsPending = false;
+ RefPtr<nsViewManager> vm = mPresContext->GetPresShell()->GetViewManager();
+ const bool skipPaint = isPresentingInVR;
+ // Skip the paint in immersive VR mode because whatever we paint here will
+ // not end up on the screen. The screen is displaying WebGL content from a
+ // single canvas in that mode.
+ if (!skipPaint) {
+ PaintTelemetry::AutoRecordPaint record;
+ vm->ProcessPendingUpdates();
+ }
+
+#ifdef MOZ_DUMP_PAINTING
+ if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
+ printf_stderr("Ending ProcessPendingUpdates\n");
+ }
+#endif
+
+ for (nsDocShell* docShell : profilingDocShells) {
+ MOZ_ASSERT(TimelineConsumers::HasConsumer(docShell));
+ TimelineConsumers::AddMarkerForDocShell(docShell, "Paint",
+ MarkerTracingType::END);
+ }
+
+ dispatchTasksAfterTick = true;
+ mHasScheduleFlush = false;
+ } else {
+ // No paint happened, discard composition payloads.
+ mCompositionPayloads.Clear();
+ }
+
+#ifndef ANDROID /* bug 1142079 */
+ double totalMs = (TimeStamp::Now() - mTickStart).ToMilliseconds();
+ mozilla::Telemetry::Accumulate(mozilla::Telemetry::REFRESH_DRIVER_TICK,
+ static_cast<uint32_t>(totalMs));
+#endif
+
+ if (mNotifyDOMContentFlushed) {
+ mNotifyDOMContentFlushed = false;
+ mPresContext->NotifyDOMContentFlushed();
+ }
+
+ for (nsAPostRefreshObserver* observer :
+ mPostRefreshObservers.ForwardRange()) {
+ observer->DidRefresh();
+ }
+
+ NS_ASSERTION(mInRefresh, "Still in refresh");
+
+ if (mPresContext->IsRoot() && XRE_IsContentProcess() &&
+ StaticPrefs::gfx_content_always_paint()) {
+ ScheduleViewManagerFlush();
+ }
+
+ if (dispatchTasksAfterTick && sPendingIdleTasks) {
+ UniquePtr<AutoTArray<RefPtr<Task>, 8>> tasks(sPendingIdleTasks.forget());
+ for (RefPtr<Task>& taskWithDelay : *tasks) {
+ TaskController::Get()->AddTask(taskWithDelay.forget());
+ }
+ }
+}
+
+void nsRefreshDriver::UpdateAnimatedImages(TimeStamp aPreviousRefresh,
+ TimeStamp aNowTime) {
+ if (mThrottled) {
+ // Don't do this when throttled, as the compositor might be paused and we
+ // don't want to queue a lot of paints, see bug 1828587.
+ return;
+ }
+ // Perform notification to imgIRequests subscribed to listen for refresh
+ // events.
+ for (const auto& entry : mStartTable) {
+ const uint32_t& delay = entry.GetKey();
+ ImageStartData* data = entry.GetWeak();
+
+ if (data->mEntries.IsEmpty()) {
+ continue;
+ }
+
+ if (data->mStartTime) {
+ TimeStamp& start = *data->mStartTime;
+
+ if (aPreviousRefresh >= start && aNowTime >= start) {
+ TimeDuration prev = aPreviousRefresh - start;
+ TimeDuration curr = aNowTime - start;
+ uint32_t prevMultiple = uint32_t(prev.ToMilliseconds()) / delay;
+
+ // We want to trigger images' refresh if we've just crossed over a
+ // multiple of the first image's start time. If so, set the animation
+ // start time to the nearest multiple of the delay and move all the
+ // images in this table to the main requests table.
+ if (prevMultiple != uint32_t(curr.ToMilliseconds()) / delay) {
+ mozilla::TimeStamp desired =
+ start + TimeDuration::FromMilliseconds(prevMultiple * delay);
+ BeginRefreshingImages(data->mEntries, desired);
+ }
+ } else {
+ // Sometimes the start time can be in the future if we spin a nested
+ // event loop and re-entrantly tick. In that case, setting the
+ // animation start time to the start time seems like the least bad
+ // thing we can do.
+ mozilla::TimeStamp desired = start;
+ BeginRefreshingImages(data->mEntries, desired);
+ }
+ } else {
+ // This is the very first time we've drawn images with this time delay.
+ // Set the animation start time to "now" and move all the images in this
+ // table to the main requests table.
+ mozilla::TimeStamp desired = aNowTime;
+ BeginRefreshingImages(data->mEntries, desired);
+ data->mStartTime.emplace(aNowTime);
+ }
+ }
+
+ if (!mRequests.IsEmpty()) {
+ // RequestRefresh may run scripts, so it's not safe to directly call it
+ // while using a hashtable enumerator to enumerate mRequests in case
+ // script modifies the hashtable. Instead, we build a (local) array of
+ // images to refresh, and then we refresh each image in that array.
+ nsTArray<nsCOMPtr<imgIContainer>> imagesToRefresh(mRequests.Count());
+
+ for (const auto& req : mRequests) {
+ nsCOMPtr<imgIContainer> image;
+ if (NS_SUCCEEDED(req->GetImage(getter_AddRefs(image)))) {
+ imagesToRefresh.AppendElement(image.forget());
+ }
+ }
+
+ for (const auto& image : imagesToRefresh) {
+ image->RequestRefresh(aNowTime);
+ }
+ }
+}
+
+void nsRefreshDriver::BeginRefreshingImages(RequestTable& aEntries,
+ mozilla::TimeStamp aDesired) {
+ for (const auto& req : aEntries) {
+ mRequests.Insert(req);
+
+ nsCOMPtr<imgIContainer> image;
+ if (NS_SUCCEEDED(req->GetImage(getter_AddRefs(image)))) {
+ image->SetAnimationStartTime(aDesired);
+ }
+ }
+ aEntries.Clear();
+}
+
+void nsRefreshDriver::Freeze() {
+ StopTimer();
+ mFreezeCount++;
+}
+
+void nsRefreshDriver::Thaw() {
+ NS_ASSERTION(mFreezeCount > 0, "Thaw() called on an unfrozen refresh driver");
+
+ if (mFreezeCount > 0) {
+ mFreezeCount--;
+ }
+
+ if (mFreezeCount == 0) {
+ if (HasObservers() || HasImageRequests()) {
+ // FIXME: This isn't quite right, since our EnsureTimerStarted call
+ // updates our mMostRecentRefresh, but the DoRefresh call won't run
+ // and notify our observers until we get back to the event loop.
+ // Thus MostRecentRefresh() will lie between now and the DoRefresh.
+ RefPtr<nsRunnableMethod<nsRefreshDriver>> event = NewRunnableMethod(
+ "nsRefreshDriver::DoRefresh", this, &nsRefreshDriver::DoRefresh);
+ nsPresContext* pc = GetPresContext();
+ if (pc) {
+ pc->Document()->Dispatch(TaskCategory::Other, event.forget());
+ EnsureTimerStarted();
+ } else {
+ NS_ERROR("Thawing while document is being destroyed");
+ }
+ }
+ }
+}
+
+void nsRefreshDriver::FinishedWaitingForTransaction() {
+ if (mSkippedPaints && !IsInRefresh() &&
+ (HasObservers() || HasImageRequests()) && CanDoCatchUpTick()) {
+ NS_DispatchToCurrentThreadQueue(
+ NS_NewRunnableFunction(
+ "nsRefreshDriver::FinishedWaitingForTransaction",
+ [self = RefPtr{this}]() {
+ if (self->CanDoCatchUpTick()) {
+ self->Tick(self->mActiveTimer->MostRecentRefreshVsyncId(),
+ self->mActiveTimer->MostRecentRefresh());
+ }
+ }),
+ EventQueuePriority::Vsync);
+ }
+ mWaitingForTransaction = false;
+ mSkippedPaints = false;
+}
+
+mozilla::layers::TransactionId nsRefreshDriver::GetTransactionId(
+ bool aThrottle) {
+ mNextTransactionId = mNextTransactionId.Next();
+ LOG("[%p] Allocating transaction id %" PRIu64, this, mNextTransactionId.mId);
+
+ // If this a paint from within a normal tick, and the caller hasn't explicitly
+ // asked for it to skip being throttled, then record this transaction as
+ // pending and maybe disable painting until some transactions are processed.
+ if (aThrottle && mInNormalTick) {
+ mPendingTransactions.AppendElement(mNextTransactionId);
+ if (TooManyPendingTransactions() && !mWaitingForTransaction &&
+ !mTestControllingRefreshes) {
+ LOG("[%p] Hit max pending transaction limit, entering wait mode", this);
+ mWaitingForTransaction = true;
+ mSkippedPaints = false;
+ }
+ }
+
+ return mNextTransactionId;
+}
+
+mozilla::layers::TransactionId nsRefreshDriver::LastTransactionId() const {
+ return mNextTransactionId;
+}
+
+void nsRefreshDriver::RevokeTransactionId(
+ mozilla::layers::TransactionId aTransactionId) {
+ MOZ_ASSERT(aTransactionId == mNextTransactionId);
+ LOG("[%p] Revoking transaction id %" PRIu64, this, aTransactionId.mId);
+ if (AtPendingTransactionLimit() &&
+ mPendingTransactions.Contains(aTransactionId) && mWaitingForTransaction) {
+ LOG("[%p] No longer over pending transaction limit, leaving wait state",
+ this);
+ MOZ_ASSERT(!mSkippedPaints,
+ "How did we skip a paint when we're in the middle of one?");
+ FinishedWaitingForTransaction();
+ }
+
+ // Notify the pres context so that it can deliver MozAfterPaint for this
+ // id if any caller was expecting it.
+ nsPresContext* pc = GetPresContext();
+ if (pc) {
+ pc->NotifyRevokingDidPaint(aTransactionId);
+ }
+ // Remove aTransactionId from the set of outstanding transactions since we're
+ // no longer waiting on it to be completed, but don't revert
+ // mNextTransactionId since we can't use the id again.
+ mPendingTransactions.RemoveElement(aTransactionId);
+}
+
+void nsRefreshDriver::ClearPendingTransactions() {
+ LOG("[%p] ClearPendingTransactions", this);
+ mPendingTransactions.Clear();
+ mWaitingForTransaction = false;
+}
+
+void nsRefreshDriver::ResetInitialTransactionId(
+ mozilla::layers::TransactionId aTransactionId) {
+ mNextTransactionId = aTransactionId;
+}
+
+mozilla::TimeStamp nsRefreshDriver::GetTransactionStart() { return mTickStart; }
+
+VsyncId nsRefreshDriver::GetVsyncId() { return mTickVsyncId; }
+
+mozilla::TimeStamp nsRefreshDriver::GetVsyncStart() { return mTickVsyncTime; }
+
+void nsRefreshDriver::NotifyTransactionCompleted(
+ mozilla::layers::TransactionId aTransactionId) {
+ LOG("[%p] Completed transaction id %" PRIu64, this, aTransactionId.mId);
+ mPendingTransactions.RemoveElement(aTransactionId);
+ if (mWaitingForTransaction && !TooManyPendingTransactions()) {
+ LOG("[%p] No longer over pending transaction limit, leaving wait state",
+ this);
+ FinishedWaitingForTransaction();
+ }
+}
+
+void nsRefreshDriver::WillRefresh(mozilla::TimeStamp aTime) {
+ mRootRefresh->RemoveRefreshObserver(this, FlushType::Style);
+ mRootRefresh = nullptr;
+ if (mSkippedPaints) {
+ DoRefresh();
+ }
+}
+
+bool nsRefreshDriver::IsWaitingForPaint(mozilla::TimeStamp aTime) {
+ if (mTestControllingRefreshes) {
+ return false;
+ }
+
+ if (mWaitingForTransaction) {
+ LOG("[%p] Over max pending transaction limit when trying to paint, "
+ "skipping",
+ this);
+ mSkippedPaints = true;
+ return true;
+ }
+
+ // Try find the 'root' refresh driver for the current window and check
+ // if that is waiting for a paint.
+ nsPresContext* pc = GetPresContext();
+ nsPresContext* rootContext = pc ? pc->GetRootPresContext() : nullptr;
+ if (rootContext) {
+ nsRefreshDriver* rootRefresh = rootContext->RefreshDriver();
+ if (rootRefresh && rootRefresh != this) {
+ if (rootRefresh->IsWaitingForPaint(aTime)) {
+ if (mRootRefresh != rootRefresh) {
+ if (mRootRefresh) {
+ mRootRefresh->RemoveRefreshObserver(this, FlushType::Style);
+ }
+ rootRefresh->AddRefreshObserver(this, FlushType::Style,
+ "Waiting for paint");
+ mRootRefresh = rootRefresh;
+ }
+ mSkippedPaints = true;
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+void nsRefreshDriver::SetActivity(bool aIsActive, bool aIsInActiveTab) {
+ if (mIsActive == aIsActive && mIsInActiveTab == aIsInActiveTab) {
+ return;
+ }
+ mIsActive = aIsActive;
+ mIsInActiveTab = aIsInActiveTab;
+
+ // For iframes which are in the active tab but hidden, grant them a grace
+ // period of 1s of activity so that they can get set up.
+ if (!mHasGrantedActivityGracePeriod && !mIsActive && mIsInActiveTab &&
+ mPresContext && !mPresContext->IsRootContentDocumentCrossProcess()) {
+ mHasGrantedActivityGracePeriod = true;
+ mIsGrantingActivityGracePeriod =
+ StaticPrefs::layout_oopif_activity_grace_period_ms() > 0;
+ if (mIsGrantingActivityGracePeriod) {
+ mActivityGracePeriodStart = TimeStamp::Now();
+ }
+ }
+
+ UpdateThrottledState();
+}
+
+void nsRefreshDriver::UpdateThrottledState() {
+ const bool shouldThrottle = ComputeShouldBeThrottled();
+ if (mThrottled == shouldThrottle) {
+ return;
+ }
+ mThrottled = shouldThrottle;
+ if (mActiveTimer || GetReasonsToTick() != TickReasons::eNone) {
+ // We want to switch our timer type here, so just stop and restart the
+ // timer.
+ EnsureTimerStarted(eForceAdjustTimer);
+ }
+}
+
+nsPresContext* nsRefreshDriver::GetPresContext() const { return mPresContext; }
+
+void nsRefreshDriver::DoRefresh() {
+ // Don't do a refresh unless we're in a state where we should be refreshing.
+ if (!IsFrozen() && mPresContext && mActiveTimer) {
+ DoTick();
+ }
+}
+
+#ifdef DEBUG
+bool nsRefreshDriver::IsRefreshObserver(nsARefreshObserver* aObserver,
+ FlushType aFlushType) {
+ ObserverArray& array = ArrayFor(aFlushType);
+ return array.Contains(aObserver);
+}
+#endif
+
+void nsRefreshDriver::ScheduleViewManagerFlush() {
+ NS_ASSERTION(mPresContext && mPresContext->IsRoot(),
+ "Should only schedule view manager flush on root prescontexts");
+ mViewManagerFlushIsPending = true;
+ if (!mViewManagerFlushCause) {
+ mViewManagerFlushCause = profiler_capture_backtrace();
+ }
+ mHasScheduleFlush = true;
+ EnsureTimerStarted(eNeverAdjustTimer);
+}
+
+void nsRefreshDriver::ScheduleFrameRequestCallbacks(Document* aDocument) {
+ NS_ASSERTION(mFrameRequestCallbackDocs.IndexOf(aDocument) ==
+ mFrameRequestCallbackDocs.NoIndex &&
+ mThrottledFrameRequestCallbackDocs.IndexOf(aDocument) ==
+ mThrottledFrameRequestCallbackDocs.NoIndex,
+ "Don't schedule the same document multiple times");
+ if (aDocument->ShouldThrottleFrameRequests()) {
+ mThrottledFrameRequestCallbackDocs.AppendElement(aDocument);
+ } else {
+ mFrameRequestCallbackDocs.AppendElement(aDocument);
+ }
+
+ // make sure that the timer is running
+ EnsureTimerStarted();
+}
+
+void nsRefreshDriver::RevokeFrameRequestCallbacks(Document* aDocument) {
+ mFrameRequestCallbackDocs.RemoveElement(aDocument);
+ mThrottledFrameRequestCallbackDocs.RemoveElement(aDocument);
+ // No need to worry about restarting our timer in slack mode if it's already
+ // running; that will happen automatically when it fires.
+}
+
+void nsRefreshDriver::ScheduleFullscreenEvent(
+ UniquePtr<PendingFullscreenEvent> aEvent) {
+ mPendingFullscreenEvents.AppendElement(std::move(aEvent));
+ // make sure that the timer is running
+ EnsureTimerStarted();
+}
+
+void nsRefreshDriver::CancelPendingFullscreenEvents(Document* aDocument) {
+ for (auto i : Reversed(IntegerRange(mPendingFullscreenEvents.Length()))) {
+ if (mPendingFullscreenEvents[i]->Document() == aDocument) {
+ mPendingFullscreenEvents.RemoveElementAt(i);
+ }
+ }
+}
+
+void nsRefreshDriver::CancelPendingAnimationEvents(
+ AnimationEventDispatcher* aDispatcher) {
+ MOZ_ASSERT(aDispatcher);
+ aDispatcher->ClearEventQueue();
+ mAnimationEventFlushObservers.RemoveElement(aDispatcher);
+}
+
+/* static */
+TimeStamp nsRefreshDriver::GetIdleDeadlineHint(TimeStamp aDefault,
+ IdleCheck aCheckType) {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(!aDefault.IsNull());
+
+ // For computing idleness of refresh drivers we only care about
+ // sRegularRateTimerList, since we consider refresh drivers attached to
+ // sThrottledRateTimer to be inactive. This implies that tasks
+ // resulting from a tick on the sRegularRateTimer counts as being
+ // busy but tasks resulting from a tick on sThrottledRateTimer
+ // counts as being idle.
+ if (sRegularRateTimer) {
+ TimeStamp retVal = sRegularRateTimer->GetIdleDeadlineHint(aDefault);
+ if (retVal != aDefault) {
+ return retVal;
+ }
+ }
+
+ TimeStamp hint = TimeStamp();
+ if (sRegularRateTimerList) {
+ for (RefreshDriverTimer* timer : *sRegularRateTimerList) {
+ TimeStamp newHint = timer->GetIdleDeadlineHint(aDefault);
+ if (newHint < aDefault && (hint.IsNull() || newHint < hint)) {
+ hint = newHint;
+ }
+ }
+ }
+
+ if (!hint.IsNull()) {
+ return hint;
+ }
+
+ if (aCheckType == IdleCheck::AllVsyncListeners && XRE_IsParentProcess()) {
+ Maybe<TimeDuration> maybeRate =
+ mozilla::gfx::VsyncSource::GetFastestVsyncRate();
+ if (maybeRate.isSome()) {
+ TimeDuration minIdlePeriod =
+ TimeDuration::FromMilliseconds(StaticPrefs::idle_period_min());
+ TimeDuration layoutIdleLimit = TimeDuration::FromMilliseconds(
+ StaticPrefs::layout_idle_period_time_limit());
+ TimeDuration rate = *maybeRate - layoutIdleLimit;
+
+ // If the rate is very short, don't let it affect idle processing in the
+ // parent process too much.
+ rate = std::max(rate, minIdlePeriod + minIdlePeriod);
+
+ TimeStamp newHint = TimeStamp::Now() + rate;
+ if (newHint < aDefault) {
+ return newHint;
+ }
+ }
+ }
+
+ return aDefault;
+}
+
+/* static */
+Maybe<TimeStamp> nsRefreshDriver::GetNextTickHint() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (sRegularRateTimer) {
+ return sRegularRateTimer->GetNextTickHint();
+ }
+
+ Maybe<TimeStamp> hint = Nothing();
+ if (sRegularRateTimerList) {
+ for (RefreshDriverTimer* timer : *sRegularRateTimerList) {
+ if (Maybe<TimeStamp> newHint = timer->GetNextTickHint()) {
+ if (!hint || newHint.value() < hint.value()) {
+ hint = newHint;
+ }
+ }
+ }
+ }
+ return hint;
+}
+
+/* static */
+bool nsRefreshDriver::IsRegularRateTimerTicking() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (sRegularRateTimer) {
+ if (sRegularRateTimer->IsTicking()) {
+ return true;
+ }
+ }
+
+ if (sRegularRateTimerList) {
+ for (RefreshDriverTimer* timer : *sRegularRateTimerList) {
+ if (timer->IsTicking()) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+void nsRefreshDriver::Disconnect() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ StopTimer();
+
+ mEarlyRunners.Clear();
+
+ if (mPresContext) {
+ mPresContext = nullptr;
+ if (--sRefreshDriverCount == 0) {
+ Shutdown();
+ }
+ }
+}
+
+#undef LOG