/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ /* 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. */ #ifdef XP_WIN #include // mmsystem isn't part of WIN32_LEAN_AND_MEAN, so we have // to manually include it #include #include "WinUtils.h" #endif #include "mozilla/ArrayUtils.h" #include "mozilla/AutoRestore.h" #include "mozilla/IntegerRange.h" #include "nsHostObjectProtocolHandler.h" #include "nsRefreshDriver.h" #include "nsITimer.h" #include "nsLayoutUtils.h" #include "nsPresContext.h" #include "nsComponentManagerUtils.h" #include "mozilla/Logging.h" #include "nsAutoPtr.h" #include "nsIDocument.h" #include "jsapi.h" #include "nsContentUtils.h" #include "mozilla/PendingAnimationTracker.h" #include "mozilla/Preferences.h" #include "nsViewManager.h" #include "GeckoProfiler.h" #include "nsNPAPIPluginInstance.h" #include "nsPerformance.h" #include "mozilla/dom/WindowBinding.h" #include "RestyleManager.h" #include "Layers.h" #include "imgIContainer.h" #include "mozilla/dom/ScriptSettings.h" #include "nsDocShell.h" #include "nsISimpleEnumerator.h" #include "nsJSEnvironment.h" #include "mozilla/Telemetry.h" #include "gfxPrefs.h" #include "BackgroundChild.h" #include "mozilla/ipc/PBackgroundChild.h" #include "nsIIPCBackgroundChildCreateCallback.h" #include "mozilla/layout/VsyncChild.h" #include "VsyncSource.h" #include "mozilla/VsyncDispatcher.h" #include "nsThreadUtils.h" #include "mozilla/unused.h" #include "mozilla/TimelineConsumers.h" #include "nsAnimationManager.h" #ifdef MOZ_NUWA_PROCESS #include "ipc/Nuwa.h" #endif using namespace mozilla; using namespace mozilla::widget; using namespace mozilla::ipc; using namespace mozilla::layout; static mozilla::LazyLogModule sRefreshDriverLog("nsRefreshDriver"); #define LOG(...) MOZ_LOG(sRefreshDriverLog, mozilla::LogLevel::Debug, (__VA_ARGS__)) #define DEFAULT_THROTTLED_FRAME_RATE 1 #define DEFAULT_RECOMPUTE_VISIBILITY_INTERVAL_MS 1000 // after 10 minutes, stop firing off inactive timers #define DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS 600 namespace { // `true` if we are currently in jank-critical mode. // // In jank-critical mode, any iteration of the event loop that takes // more than 16ms to compute will cause an ongoing animation to miss // frames. // // For simplicity, the current implementation assumes that we are in // jank-critical mode if and only if at least one vsync driver has // at least one observer. static uint64_t sActiveVsyncTimers = 0; } namespace mozilla { /* * 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() : mLastFireEpoch(0) { } 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 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(); } } virtual 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* rootContext = aDriver->PresContext()->GetRootPresContext(); // 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; } int64_t MostRecentRefreshEpochTime() const { return mLastFireEpoch; } void SwapRefreshDrivers(RefreshDriverTimer* aNewTimer) { MOZ_ASSERT(NS_IsMainThread()); for (nsRefreshDriver* driver : mContentRefreshDrivers) { aNewTimer->AddRefreshDriver(driver); driver->mActiveTimer = aNewTimer; } mContentRefreshDrivers.Clear(); for (nsRefreshDriver* driver : mRootRefreshDrivers) { aNewTimer->AddRefreshDriver(driver); driver->mActiveTimer = aNewTimer; } mRootRefreshDrivers.Clear(); aNewTimer->mLastFireEpoch = mLastFireEpoch; aNewTimer->mLastFireTime = mLastFireTime; } protected: virtual void StartTimer() = 0; virtual void StopTimer() = 0; virtual void ScheduleNextTick(TimeStamp aNowTime) = 0; bool IsRootRefreshDriver(nsRefreshDriver* aDriver) { nsPresContext* rootContext = aDriver->PresContext()->GetRootPresContext(); if (!rootContext) { return false; } return aDriver == rootContext->RefreshDriver(); } /* * Actually runs a tick, poking all the attached RefreshDrivers. * Grabs the "now" time via JS_Now and TimeStamp::Now(). */ void Tick() { int64_t jsnow = JS_Now(); TimeStamp now = TimeStamp::Now(); Tick(jsnow, now); } void TickRefreshDrivers(int64_t aJsNow, TimeStamp aNow, nsTArray>& aDrivers) { if (aDrivers.IsEmpty()) { return; } nsTArray > drivers(aDrivers); for (nsRefreshDriver* driver : drivers) { // don't poke this driver if it's in test mode if (driver->IsTestControllingRefreshesEnabled()) { continue; } TickDriver(driver, aJsNow, aNow); } } /* * Tick the refresh drivers based on the given timestamp. */ void Tick(int64_t jsnow, TimeStamp now) { ScheduleNextTick(now); mLastFireEpoch = jsnow; mLastFireTime = now; LOG("[%p] ticking drivers...", this); // RD is short for RefreshDriver profiler_tracing("Paint", "RD", TRACING_INTERVAL_START); TickRefreshDrivers(jsnow, now, mContentRefreshDrivers); TickRefreshDrivers(jsnow, now, mRootRefreshDrivers); profiler_tracing("Paint", "RD", TRACING_INTERVAL_END); LOG("[%p] done.", this); } static void TickDriver(nsRefreshDriver* driver, int64_t jsnow, TimeStamp now) { LOG(">> TickDriver: %p (jsnow: %lld)", driver, jsnow); driver->Tick(jsnow, now); } int64_t mLastFireEpoch; TimeStamp mLastFireTime; TimeStamp mTargetTime; nsTArray > mContentRefreshDrivers; nsTArray > mRootRefreshDrivers; // useful callback for nsITimer-based derived classes, here // bacause of c++ protected shenanigans static void TimerTick(nsITimer* aTimer, void* aClosure) { RefreshDriverTimer *timer = static_cast(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 = do_CreateInstance(NS_TIMER_CONTRACTID); } virtual ~SimpleTimerBasedRefreshDriverTimer() { StopTimer(); } // will take effect at next timer tick virtual void SetRate(double aNewRate) { mRateMilliseconds = aNewRate; mRateDuration = TimeDuration::FromMilliseconds(mRateMilliseconds); } double GetRate() const { return mRateMilliseconds; } protected: virtual void StartTimer() { // pretend we just fired, and we schedule the next tick normally mLastFireEpoch = JS_Now(); mLastFireTime = TimeStamp::Now(); mTargetTime = mLastFireTime + mRateDuration; uint32_t delay = static_cast(mRateMilliseconds); mTimer->InitWithFuncCallback(TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT); } virtual void StopTimer() { mTimer->Cancel(); } double mRateMilliseconds; TimeDuration mRateDuration; RefPtr 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: VsyncRefreshDriverTimer() : mVsyncChild(nullptr) { MOZ_ASSERT(XRE_IsParentProcess()); MOZ_ASSERT(NS_IsMainThread()); mVsyncObserver = new RefreshDriverVsyncObserver(this); RefPtr vsyncSource = gfxPlatform::GetPlatform()->GetHardwareVsync(); MOZ_ALWAYS_TRUE(mVsyncDispatcher = vsyncSource->GetRefreshTimerVsyncDispatcher()); mVsyncDispatcher->SetParentRefreshTimer(mVsyncObserver); } explicit VsyncRefreshDriverTimer(VsyncChild* aVsyncChild) : mVsyncChild(aVsyncChild) { MOZ_ASSERT(!XRE_IsParentProcess()); MOZ_ASSERT(NS_IsMainThread()); MOZ_ASSERT(mVsyncChild); mVsyncObserver = new RefreshDriverVsyncObserver(this); mVsyncChild->SetVsyncObserver(mVsyncObserver); } private: // Since VsyncObservers are refCounted, but the RefreshDriverTimer are // explicitly shutdown. We create an inner class that has the VsyncObserver // and is shutdown when the RefreshDriverTimer is deleted. The alternative is // to (a) make all RefreshDriverTimer RefCounted or (b) use different // VsyncObserver types. class RefreshDriverVsyncObserver final : public VsyncObserver { public: explicit RefreshDriverVsyncObserver(VsyncRefreshDriverTimer* aVsyncRefreshDriverTimer) : mVsyncRefreshDriverTimer(aVsyncRefreshDriverTimer) , mRefreshTickLock("RefreshTickLock") , mRecentVsync(TimeStamp::Now()) , mLastChildTick(TimeStamp::Now()) , mVsyncRate(TimeDuration::Forever()) , mProcessedVsync(true) { MOZ_ASSERT(NS_IsMainThread()); } virtual bool NotifyVsync(TimeStamp aVsyncTimestamp) override { // IMPORTANT: All paths through this method MUST hold a strong ref on // |this| for the duration of the TickRefreshDriver callback. if (!NS_IsMainThread()) { MOZ_ASSERT(XRE_IsParentProcess()); // 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 MonitorAutoLock lock(mRefreshTickLock); mRecentVsync = aVsyncTimestamp; if (!mProcessedVsync) { return true; } mProcessedVsync = false; } nsCOMPtr vsyncEvent = NS_NewRunnableMethodWithArg(this, &RefreshDriverVsyncObserver::TickRefreshDriver, aVsyncTimestamp); NS_DispatchToMainThread(vsyncEvent); } else { RefPtr kungFuDeathGrip(this); TickRefreshDriver(aVsyncTimestamp); } return true; } void Shutdown() { MOZ_ASSERT(NS_IsMainThread()); mVsyncRefreshDriverTimer = nullptr; } void OnTimerStart() { if (!XRE_IsParentProcess()) { mLastChildTick = TimeStamp::Now(); } } private: virtual ~RefreshDriverVsyncObserver() {} 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() - mLastChildTick) - 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 from the parent process. Might be a few vsyncs // until the parent responds. mVsyncRate = mVsyncRefreshDriverTimer->mVsyncChild->GetVsyncRate(); } #endif } void TickRefreshDriver(TimeStamp aVsyncTimestamp) { MOZ_ASSERT(NS_IsMainThread()); RecordTelemetryProbes(aVsyncTimestamp); if (XRE_IsParentProcess()) { MonitorAutoLock lock(mRefreshTickLock); aVsyncTimestamp = mRecentVsync; mProcessedVsync = true; } else { mLastChildTick = TimeStamp::Now(); } MOZ_ASSERT(aVsyncTimestamp <= TimeStamp::Now()); // We might have a problem that we call ~VsyncRefreshDriverTimer() before // the scheduled TickRefreshDriver() runs. Check mVsyncRefreshDriverTimer // before use. if (mVsyncRefreshDriverTimer) { mVsyncRefreshDriverTimer->RunRefreshDrivers(aVsyncTimestamp); } } // VsyncRefreshDriverTimer holds this RefreshDriverVsyncObserver and it will // be always available before Shutdown(). We can just use the raw pointer // here. VsyncRefreshDriverTimer* mVsyncRefreshDriverTimer; Monitor mRefreshTickLock; TimeStamp mRecentVsync; TimeStamp mLastChildTick; TimeDuration mVsyncRate; bool mProcessedVsync; }; // RefreshDriverVsyncObserver virtual ~VsyncRefreshDriverTimer() { if (XRE_IsParentProcess()) { mVsyncDispatcher->SetParentRefreshTimer(nullptr); mVsyncDispatcher = nullptr; } else { // Since the PVsyncChild actors live through the life of the process, just // send the unobserveVsync message to disable vsync event. We don't need // to handle the cleanup stuff of this actor. PVsyncChild::ActorDestroy() // will be called and clean up this actor. Unused << mVsyncChild->SendUnobserve(); mVsyncChild->SetVsyncObserver(nullptr); mVsyncChild = nullptr; } // Detach current vsync timer from this VsyncObserver. The observer will no // longer tick this timer. mVsyncObserver->Shutdown(); mVsyncObserver = nullptr; } virtual void StartTimer() override { // Protect updates to `sActiveVsyncTimers`. MOZ_ASSERT(NS_IsMainThread()); mLastFireEpoch = JS_Now(); mLastFireTime = TimeStamp::Now(); if (XRE_IsParentProcess()) { mVsyncDispatcher->SetParentRefreshTimer(mVsyncObserver); } else { Unused << mVsyncChild->SendObserve(); mVsyncObserver->OnTimerStart(); } ++sActiveVsyncTimers; } virtual void StopTimer() override { // Protect updates to `sActiveVsyncTimers`. MOZ_ASSERT(NS_IsMainThread()); if (XRE_IsParentProcess()) { mVsyncDispatcher->SetParentRefreshTimer(nullptr); } else { Unused << mVsyncChild->SendUnobserve(); } MOZ_ASSERT(sActiveVsyncTimers > 0); --sActiveVsyncTimers; } virtual void ScheduleNextTick(TimeStamp aNowTime) override { // Do nothing since we just wait for the next vsync from // RefreshDriverVsyncObserver. } void RunRefreshDrivers(TimeStamp aTimeStamp) { int64_t jsnow = JS_Now(); TimeDuration diff = TimeStamp::Now() - aTimeStamp; int64_t vsyncJsNow = jsnow - diff.ToMicroseconds(); Tick(vsyncJsNow, aTimeStamp); } RefPtr mVsyncObserver; // Used for parent process. RefPtr mVsyncDispatcher; // Used for child process. // The mVsyncChild will be always available before VsncChild::ActorDestroy(). // After ActorDestroy(), StartTimer() and StopTimer() calls will be non-op. RefPtr mVsyncChild; }; // 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: virtual void ScheduleNextTick(TimeStamp aNowTime) { // 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((newTarget - aNowTime).ToMilliseconds()); mTimer->InitWithFuncCallback(TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT); mTargetTime = newTarget; } }; /* * 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) { } virtual void AddRefreshDriver(nsRefreshDriver* aDriver) { 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(); } protected: uint32_t GetRefreshDriverCount() { return mContentRefreshDrivers.Length() + mRootRefreshDrivers.Length(); } virtual void StartTimer() { mLastFireEpoch = JS_Now(); mLastFireTime = TimeStamp::Now(); mTargetTime = mLastFireTime + mRateDuration; uint32_t delay = static_cast(mRateMilliseconds); mTimer->InitWithFuncCallback(TimerTickOne, this, delay, nsITimer::TYPE_ONE_SHOT); } virtual void StopTimer() { mTimer->Cancel(); } virtual void ScheduleNextTick(TimeStamp aNowTime) { 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(mNextTickDuration); mTimer->InitWithFuncCallback(TimerTickOne, this, delay, nsITimer::TYPE_ONE_SHOT); LOG("[%p] inactive timer next tick in %f ms [index %d/%d]", this, mNextTickDuration, mNextDriverIndex, GetRefreshDriverCount()); } /* Runs just one driver's tick. */ void TickOne() { int64_t jsnow = JS_Now(); TimeStamp now = TimeStamp::Now(); ScheduleNextTick(now); mLastFireEpoch = jsnow; mLastFireTime = now; nsTArray > drivers(mContentRefreshDrivers); drivers.AppendElements(mRootRefreshDrivers); if (mNextDriverIndex < drivers.Length() && !drivers[mNextDriverIndex]->IsTestControllingRefreshesEnabled()) { TickDriver(drivers[mNextDriverIndex], jsnow, now); } mNextDriverIndex++; } static void TimerTickOne(nsITimer* aTimer, void* aClosure) { InactiveRefreshDriverTimer *timer = static_cast(aClosure); timer->TickOne(); } double mNextTickDuration; double mDisableAfterMilliseconds; uint32_t mNextDriverIndex; }; // The PBackground protocol connection callback. It will be called when // PBackground is ready. Then we create the PVsync sub-protocol for our // vsync-base RefreshTimer. class VsyncChildCreateCallback final : public nsIIPCBackgroundChildCreateCallback { NS_DECL_ISUPPORTS public: VsyncChildCreateCallback() { MOZ_ASSERT(NS_IsMainThread()); } static void CreateVsyncActor(PBackgroundChild* aPBackgroundChild) { MOZ_ASSERT(NS_IsMainThread()); MOZ_ASSERT(aPBackgroundChild); layout::PVsyncChild* actor = aPBackgroundChild->SendPVsyncConstructor(); layout::VsyncChild* child = static_cast(actor); nsRefreshDriver::PVsyncActorCreated(child); } private: virtual ~VsyncChildCreateCallback() {} virtual void ActorCreated(PBackgroundChild* aPBackgroundChild) override { MOZ_ASSERT(NS_IsMainThread()); MOZ_ASSERT(aPBackgroundChild); CreateVsyncActor(aPBackgroundChild); } virtual void ActorFailed() override { MOZ_ASSERT(NS_IsMainThread()); MOZ_CRASH("Failed To Create VsyncChild Actor"); } }; // VsyncChildCreateCallback NS_IMPL_ISUPPORTS(VsyncChildCreateCallback, nsIIPCBackgroundChildCreateCallback) } // namespace mozilla static RefreshDriverTimer* sRegularRateTimer; static InactiveRefreshDriverTimer* sThrottledRateTimer; #ifdef XP_WIN static int32_t sHighPrecisionTimerRequests = 0; // a bare pointer to avoid introducing a static constructor static nsITimer *sDisableHighPrecisionTimersTimer = nullptr; #endif static void CreateContentVsyncRefreshTimer(void*) { MOZ_ASSERT(NS_IsMainThread()); MOZ_ASSERT(!XRE_IsParentProcess()); // Create the PVsync actor child for vsync-base refresh timer. // PBackgroundChild is created asynchronously. If PBackgroundChild is still // unavailable, setup VsyncChildCreateCallback callback to handle the async // connect. We will still use software timer before PVsync ready, and change // to use hw timer when the connection is done. Please check // VsyncChildCreateCallback::CreateVsyncActor() and // nsRefreshDriver::PVsyncActorCreated(). PBackgroundChild* backgroundChild = BackgroundChild::GetForCurrentThread(); if (backgroundChild) { // If we already have PBackgroundChild, create the // child VsyncRefreshDriverTimer here. VsyncChildCreateCallback::CreateVsyncActor(backgroundChild); return; } // Setup VsyncChildCreateCallback callback RefPtr callback = new VsyncChildCreateCallback(); if (NS_WARN_IF(!BackgroundChild::GetOrCreateForCurrentThread(callback))) { MOZ_CRASH("PVsync actor create failed!"); } } static void CreateVsyncRefreshTimer() { MOZ_ASSERT(NS_IsMainThread()); // Sometimes, gfxPrefs is not initialized here. Make sure the gfxPrefs is // ready. gfxPrefs::GetSingleton(); if (gfxPlatform::IsInLayoutAsapMode()) { return; } if (XRE_IsParentProcess()) { // Make sure all vsync systems are ready. gfxPlatform::GetPlatform(); // In parent process, we don't need to use ipc. We can create the // VsyncRefreshDriverTimer directly. sRegularRateTimer = new VsyncRefreshDriverTimer(); return; } #ifdef MOZ_NUWA_PROCESS // NUWA process will just use software timer. Use NuwaAddFinalConstructor() // to register a callback to create the vsync-base refresh timer after a // process is created. if (IsNuwaProcess()) { NuwaAddFinalConstructor(&CreateContentVsyncRefreshTimer, nullptr); return; } #endif // If this process is not created by NUWA, just create the vsync timer here. CreateContentVsyncRefreshTimer(nullptr); } static uint32_t GetFirstFrameDelay(imgIRequest* req) { nsCOMPtr 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(delay); } /* static */ void nsRefreshDriver::InitializeStatics() { } /* static */ void nsRefreshDriver::Shutdown() { // clean up our timers delete sRegularRateTimer; delete sThrottledRateTimer; sRegularRateTimer = nullptr; sThrottledRateTimer = nullptr; #ifdef XP_WIN if (sDisableHighPrecisionTimersTimer) { sDisableHighPrecisionTimersTimer->Cancel(); NS_RELEASE(sDisableHighPrecisionTimersTimer); timeEndPeriod(1); } else if (sHighPrecisionTimerRequests) { timeEndPeriod(1); } #endif } /* static */ int32_t nsRefreshDriver::DefaultInterval() { return NSToIntRound(1000.0 / gfxPlatform::GetDefaultFrameRate()); } // 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(bool *outIsDefault) const { int32_t rate = Preferences::GetInt("layout.frame_rate", -1); if (rate < 0) { rate = gfxPlatform::GetDefaultFrameRate(); if (outIsDefault) { *outIsDefault = true; } } else { if (outIsDefault) { *outIsDefault = false; } } if (rate == 0) { rate = 10000; } return 1000.0 / rate; } /* static */ double nsRefreshDriver::GetThrottledTimerInterval() { int32_t rate = Preferences::GetInt("layout.throttled_frame_rate", -1); if (rate <= 0) { rate = DEFAULT_THROTTLED_FRAME_RATE; } return 10000.0 / rate; } /* static */ mozilla::TimeDuration nsRefreshDriver::GetMinRecomputeVisibilityInterval() { int32_t interval = Preferences::GetInt("layout.visibility.min-recompute-interval-ms", -1); if (interval <= 0) { interval = DEFAULT_RECOMPUTE_VISIBILITY_INTERVAL_MS; } return TimeDuration::FromMilliseconds(interval); } double nsRefreshDriver::GetRefreshTimerInterval() const { return mThrottled ? GetThrottledTimerInterval() : GetRegularTimerInterval(); } RefreshDriverTimer* nsRefreshDriver::ChooseTimer() const { if (mThrottled) { if (!sThrottledRateTimer) sThrottledRateTimer = new InactiveRefreshDriverTimer(GetThrottledTimerInterval(), DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS * 1000.0); return sThrottledRateTimer; } if (!sRegularRateTimer) { bool isDefault = true; double rate = GetRegularTimerInterval(&isDefault); // Try to use vsync-base refresh timer first for sRegularRateTimer. CreateVsyncRefreshTimer(); if (!sRegularRateTimer) { sRegularRateTimer = new StartupRefreshDriverTimer(rate); } } return sRegularRateTimer; } nsRefreshDriver::nsRefreshDriver(nsPresContext* aPresContext) : mActiveTimer(nullptr), mReflowCause(nullptr), mStyleCause(nullptr), mPresContext(aPresContext), mRootRefresh(nullptr), mPendingTransaction(0), mCompletedTransaction(0), mFreezeCount(0), mThrottledFrameRequestInterval(TimeDuration::FromMilliseconds( GetThrottledTimerInterval())), mMinRecomputeVisibilityInterval(GetMinRecomputeVisibilityInterval()), mThrottled(false), mNeedToRecomputeVisibility(false), mTestControllingRefreshes(false), mViewManagerFlushIsPending(false), mRequestedHighPrecision(false), mInRefresh(false), mWaitingForTransaction(false), mSkippedPaints(false) { mMostRecentRefreshEpochTime = JS_Now(); mMostRecentRefresh = TimeStamp::Now(); mMostRecentTick = mMostRecentRefresh; mNextThrottledFrameRequestTick = mMostRecentTick; mNextRecomputeVisibilityTick = mMostRecentTick; } nsRefreshDriver::~nsRefreshDriver() { MOZ_ASSERT(ObserverCount() == 0, "observers should have unregistered"); MOZ_ASSERT(!mActiveTimer, "timer should be gone"); if (mRootRefresh) { mRootRefresh->RemoveRefreshObserver(this, Flush_Style); mRootRefresh = nullptr; } for (nsIPresShell* shell : mPresShellsToInvalidateIfHidden) { shell->InvalidatePresShellIfHidden(); } mPresShellsToInvalidateIfHidden.Clear(); profiler_free_backtrace(mStyleCause); profiler_free_backtrace(mReflowCause); } // 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) { mMostRecentRefreshEpochTime = JS_Now(); mMostRecentRefresh = TimeStamp::Now(); mTestControllingRefreshes = true; if (mWaitingForTransaction) { // Disable any refresh driver throttling when entering test mode mWaitingForTransaction = false; mSkippedPaints = false; } } mMostRecentRefreshEpochTime += aMilliseconds * 1000; mMostRecentRefresh += TimeDuration::FromMilliseconds((double) aMilliseconds); mozilla::dom::AutoNoJSAPI nojsapi; DoTick(); } void nsRefreshDriver::RestoreNormalRefresh() { mTestControllingRefreshes = false; EnsureTimerStarted(eAllowTimeToGoBackwards); mCompletedTransaction = mPendingTransaction; } TimeStamp nsRefreshDriver::MostRecentRefresh() const { const_cast(this)->EnsureTimerStarted(); return mMostRecentRefresh; } int64_t nsRefreshDriver::MostRecentRefreshEpochTime() const { const_cast(this)->EnsureTimerStarted(); return mMostRecentRefreshEpochTime; } bool nsRefreshDriver::AddRefreshObserver(nsARefreshObserver* aObserver, mozFlushType aFlushType) { ObserverArray& array = ArrayFor(aFlushType); bool success = array.AppendElement(aObserver) != nullptr; EnsureTimerStarted(); return success; } bool nsRefreshDriver::RemoveRefreshObserver(nsARefreshObserver* aObserver, mozFlushType aFlushType) { ObserverArray& array = ArrayFor(aFlushType); return array.RemoveElement(aObserver); } void nsRefreshDriver::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver) { mPostRefreshObservers.AppendElement(aObserver); } void nsRefreshDriver::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver) { mPostRefreshObservers.RemoveElement(aObserver); } bool nsRefreshDriver::AddImageRequest(imgIRequest* aRequest) { uint32_t delay = GetFirstFrameDelay(aRequest); if (delay == 0) { if (!mRequests.PutEntry(aRequest)) { return false; } } else { ImageStartData* start = mStartTable.Get(delay); if (!start) { start = new ImageStartData(); mStartTable.Put(delay, start); } start->mEntries.PutEntry(aRequest); } EnsureTimerStarted(); return true; } void nsRefreshDriver::RemoveImageRequest(imgIRequest* aRequest) { // Try to remove from both places, just in case, because we can't tell // whether RemoveEntry() succeeds. mRequests.RemoveEntry(aRequest); uint32_t delay = GetFirstFrameDelay(aRequest); if (delay != 0) { ImageStartData* start = mStartTable.Get(delay); if (start) { start->mEntries.RemoveEntry(aRequest); } } } void nsRefreshDriver::EnsureTimerStarted(EnsureTimerStartedFlags aFlags) { if (mTestControllingRefreshes) return; // will it already fire, and no other changes needed? if (mActiveTimer && !(aFlags & eAdjustingTimer)) 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). nsIURI* uri = mPresContext->Document()->GetDocumentURI(); if (!uri || !IsFontTableURI(uri)) { 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); } // 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. However, the refresh driver time // should not go backwards so we clamp the most recent refresh time. // // The one exception to this is when we are restoring the refresh driver // from test control in which case the time is expected to go backwards // (see bug 1043078). mMostRecentRefresh = aFlags & eAllowTimeToGoBackwards ? mActiveTimer->MostRecentRefresh() : std::max(mActiveTimer->MostRecentRefresh(), mMostRecentRefresh); mMostRecentRefreshEpochTime = aFlags & eAllowTimeToGoBackwards ? mActiveTimer->MostRecentRefreshEpochTime() : std::max(mActiveTimer->MostRecentRefreshEpochTime(), mMostRecentRefreshEpochTime); } void nsRefreshDriver::StopTimer() { if (!mActiveTimer) return; mActiveTimer->RemoveRefreshDriver(this); mActiveTimer = nullptr; if (mRequestedHighPrecision) { SetHighPrecisionTimersEnabled(false); } } #ifdef XP_WIN static void DisableHighPrecisionTimersCallback(nsITimer *aTimer, void *aClosure) { timeEndPeriod(1); NS_RELEASE(sDisableHighPrecisionTimersTimer); } #endif void nsRefreshDriver::ConfigureHighPrecision() { bool haveUnthrottledFrameRequestCallbacks = mFrameRequestCallbackDocs.Length() > 0; // if the only change that's needed is that we need high precision, // then just set that if (!mThrottled && !mRequestedHighPrecision && haveUnthrottledFrameRequestCallbacks) { SetHighPrecisionTimersEnabled(true); } else if (mRequestedHighPrecision && !haveUnthrottledFrameRequestCallbacks) { SetHighPrecisionTimersEnabled(false); } } void nsRefreshDriver::SetHighPrecisionTimersEnabled(bool aEnable) { LOG("[%p] SetHighPrecisionTimersEnabled (%s)", this, aEnable ? "true" : "false"); if (aEnable) { NS_ASSERTION(!mRequestedHighPrecision, "SetHighPrecisionTimersEnabled(true) called when already requested!"); #ifdef XP_WIN if (++sHighPrecisionTimerRequests == 1) { // If we had a timer scheduled to disable it, that means that it's already // enabled; just cancel the timer. Otherwise, really enable it. if (sDisableHighPrecisionTimersTimer) { sDisableHighPrecisionTimersTimer->Cancel(); NS_RELEASE(sDisableHighPrecisionTimersTimer); } else { timeBeginPeriod(1); } } #endif mRequestedHighPrecision = true; } else { NS_ASSERTION(mRequestedHighPrecision, "SetHighPrecisionTimersEnabled(false) called when not requested!"); #ifdef XP_WIN if (--sHighPrecisionTimerRequests == 0) { // Don't jerk us around between high precision and low precision // timers; instead, only allow leaving high precision timers // after 90 seconds. This is arbitrary, but hopefully good // enough. NS_ASSERTION(!sDisableHighPrecisionTimersTimer, "We shouldn't have an outstanding disable-high-precision timer !"); nsCOMPtr timer = do_CreateInstance(NS_TIMER_CONTRACTID); if (timer) { timer.forget(&sDisableHighPrecisionTimersTimer); sDisableHighPrecisionTimersTimer->InitWithFuncCallback(DisableHighPrecisionTimersCallback, nullptr, 90 * 1000, nsITimer::TYPE_ONE_SHOT); } else { // might happen if we're shutting down XPCOM; just drop the time period down // immediately timeEndPeriod(1); } } #endif mRequestedHighPrecision = false; } } uint32_t nsRefreshDriver::ObserverCount() const { uint32_t sum = 0; for (uint32_t i = 0; i < ArrayLength(mObservers); ++i) { sum += mObservers[i].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 += mStyleFlushObservers.Length(); sum += mLayoutFlushObservers.Length(); sum += mPendingEvents.Length(); sum += mFrameRequestCallbackDocs.Length(); sum += mThrottledFrameRequestCallbackDocs.Length(); sum += mViewManagerFlushIsPending; return sum; } uint32_t nsRefreshDriver::ImageRequestCount() const { uint32_t count = 0; for (auto iter = mStartTable.ConstIter(); !iter.Done(); iter.Next()) { count += iter.UserData()->mEntries.Count(); } return count + mRequests.Count(); } nsRefreshDriver::ObserverArray& nsRefreshDriver::ArrayFor(mozFlushType aFlushType) { switch (aFlushType) { case Flush_Style: return mObservers[0]; case Flush_Layout: return mObservers[1]; case Flush_Display: return mObservers[2]; default: MOZ_ASSERT(false, "bad flush type"); return *static_cast(nullptr); } } /* * nsITimerCallback implementation */ void nsRefreshDriver::DoTick() { NS_PRECONDITION(!IsFrozen(), "Why are we notified while frozen?"); NS_PRECONDITION(mPresContext, "Why are we notified after disconnection?"); NS_PRECONDITION(!nsContentUtils::GetCurrentJSContext(), "Shouldn't have a JSContext on the stack"); if (mTestControllingRefreshes) { Tick(mMostRecentRefreshEpochTime, mMostRecentRefresh); } else { Tick(JS_Now(), TimeStamp::Now()); } } struct DocumentFrameCallbacks { explicit DocumentFrameCallbacks(nsIDocument* aDocument) : mDocument(aDocument) {} nsCOMPtr mDocument; nsIDocument::FrameRequestCallbackList mCallbacks; }; static nsDocShell* GetDocShell(nsPresContext* aPresContext) { return static_cast(aPresContext->GetDocShell()); } static bool HasPendingAnimations(nsIPresShell* aShell) { nsIDocument* doc = aShell->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& aShells) { if (!aRootDocShell) { return; } RefPtr timelines = TimelineConsumers::Get(); if (!timelines || timelines->IsEmpty()) { return; } nsCOMPtr enumerator; nsresult rv = aRootDocShell->GetDocShellEnumerator( nsIDocShellTreeItem::typeAll, nsIDocShell::ENUMERATE_BACKWARDS, getter_AddRefs(enumerator)); if (NS_FAILED(rv)) { return; } nsCOMPtr curItem; bool hasMore = false; while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore) { nsCOMPtr curSupports; enumerator->GetNext(getter_AddRefs(curSupports)); curItem = do_QueryInterface(curSupports); if (!curItem || !curItem->GetRecordProfileTimelineMarkers()) { continue; } nsDocShell* shell = static_cast(curItem.get()); bool isVisible = false; shell->GetVisibility(&isVisible); if (!isVisible) { continue; } aShells.AppendElement(shell); }; } static void TakeFrameRequestCallbacksFrom(nsIDocument* aDocument, nsTArray& aTarget) { aTarget.AppendElement(aDocument); aDocument->TakeFrameRequestCallbacks(aTarget.LastElement().mCallbacks); } void nsRefreshDriver::DispatchPendingEvents() { // Swap out the current pending events nsTArray pendingEvents(Move(mPendingEvents)); for (PendingEvent& event : pendingEvents) { bool dummy; event.mTarget->DispatchEvent(event.mEvent, &dummy); } } static bool CollectDocuments(nsIDocument* aDocument, void* aDocArray) { static_cast*>(aDocArray)->AppendObject(aDocument); aDocument->EnumerateSubDocuments(CollectDocuments, aDocArray); return true; } void nsRefreshDriver::DispatchAnimationEvents() { if (!mPresContext) { return; } nsCOMArray documents; CollectDocuments(mPresContext->Document(), &documents); for (int32_t i = 0; i < documents.Count(); ++i) { nsIDocument* doc = documents[i]; nsIPresShell* shell = doc->GetShell(); if (!shell) { continue; } RefPtr context = shell->GetPresContext(); if (!context || context->RefreshDriver() != this) { continue; } context->TransitionManager()->SortEvents(); context->AnimationManager()->SortEvents(); // Dispatch transition events first since transitions conceptually sit // below animations in terms of compositing order. context->TransitionManager()->DispatchEvents(); // Check that the presshell has not been destroyed if (context->GetPresShell()) { context->AnimationManager()->DispatchEvents(); } } } void nsRefreshDriver::RunFrameRequestCallbacks(TimeStamp aNowTime) { // Grab all of our frame request callbacks up front. nsTArray frameRequestCallbacks(mFrameRequestCallbackDocs.Length() + mThrottledFrameRequestCallbackDocs.Length()); // First, grab throttled frame request callbacks. { nsTArray 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 (nsIDocument* 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 (nsIDocument* doc : docsToRemove) { mThrottledFrameRequestCallbackDocs.RemoveElement(doc); } } } // Now grab unthrottled frame request callbacks. for (nsIDocument* doc : mFrameRequestCallbackDocs) { TakeFrameRequestCallbacksFrom(doc, frameRequestCallbacks); } // Reset mFrameRequestCallbackDocs so they can be readded as needed. mFrameRequestCallbackDocs.Clear(); if (!frameRequestCallbacks.IsEmpty()) { profiler_tracing("Paint", "Scripts", TRACING_INTERVAL_START); for (const DocumentFrameCallbacks& docCallbacks : frameRequestCallbacks) { // XXXbz Bug 863140: GetInnerWindow can return the outer // window in some cases. nsPIDOMWindow* innerWindow = docCallbacks.mDocument->GetInnerWindow(); DOMHighResTimeStamp timeStamp = 0; if (innerWindow && innerWindow->IsInnerWindow()) { nsPerformance* perf = innerWindow->GetPerformance(); if (perf) { timeStamp = perf->GetDOMTiming()->TimeStampToDOMHighRes(aNowTime); } // else window is partially torn down already } for (auto& callback : docCallbacks.mCallbacks) { callback->Call(timeStamp); } } profiler_tracing("Paint", "Scripts", TRACING_INTERVAL_END); } } void nsRefreshDriver::Tick(int64_t aNowEpoch, TimeStamp aNowTime) { NS_PRECONDITION(!nsContentUtils::GetCurrentJSContext(), "Shouldn't have a JSContext on the stack"); if (nsNPAPIPluginInstance::InPluginCallUnsafeForReentry()) { NS_ERROR("Refresh driver should not run during plugin call!"); // Try to survive this by just ignoring the refresh tick. return; } PROFILER_LABEL("nsRefreshDriver", "Tick", js::ProfileEntry::Category::GRAPHICS); // 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 ((aNowTime <= mMostRecentRefresh) && !mTestControllingRefreshes) { return; } TimeStamp previousRefresh = mMostRecentRefresh; mMostRecentRefresh = aNowTime; mMostRecentRefreshEpochTime = aNowEpoch; if (IsWaitingForPaint(aNowTime)) { // We're currently suspended waiting for earlier Tick's to // be completed (on the Compositor). Mark that we missed the paint // and keep waiting. return; } mMostRecentTick = aNowTime; if (mRootRefresh) { mRootRefresh->RemoveRefreshObserver(this, Flush_Style); mRootRefresh = nullptr; } mSkippedPaints = false; nsCOMPtr presShell = mPresContext->GetPresShell(); if (!presShell || (ObserverCount() == 0 && ImageRequestCount() == 0)) { // Things are being destroyed, or we no longer have any observers. // 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. StopTimer(); return; } AutoRestore restoreInRefresh(mInRefresh); mInRefresh = true; AutoRestore restoreTickStart(mTickStart); mTickStart = TimeStamp::Now(); /* * 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, we must stop notifying observers. */ for (uint32_t i = 0; i < ArrayLength(mObservers); ++i) { ObserverArray::EndLimitedIterator etor(mObservers[i]); while (etor.HasMore()) { RefPtr obs = etor.GetNext(); obs->WillRefresh(aNowTime); if (!mPresContext || !mPresContext->GetPresShell()) { StopTimer(); return; } } if (i == 0) { // This is the Flush_Style case. DispatchAnimationEvents(); DispatchPendingEvents(); RunFrameRequestCallbacks(aNowTime); if (mPresContext && mPresContext->GetPresShell()) { bool tracingStyleFlush = false; nsAutoTArray 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. nsIPresShell* shell = observers[j - 1]; if (!mStyleFlushObservers.Contains(shell)) continue; if (!tracingStyleFlush) { tracingStyleFlush = true; profiler_tracing("Paint", "Styles", mStyleCause, TRACING_INTERVAL_START); mStyleCause = nullptr; } NS_ADDREF(shell); mStyleFlushObservers.RemoveElement(shell); shell->GetPresContext()->RestyleManager()->mObservingRefreshDriver = false; shell->FlushPendingNotifications(ChangesToFlush(Flush_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). nsPresContext* presContext = shell->GetPresContext(); if (presContext) { presContext->NotifyFontFaceSetOnRefresh(); } NS_RELEASE(shell); mNeedToRecomputeVisibility = true; } if (tracingStyleFlush) { profiler_tracing("Paint", "Styles", TRACING_INTERVAL_END); } if (!nsLayoutUtils::AreAsyncAnimationsEnabled()) { mPresContext->TickLastStyleUpdateForAllAnimations(); } } } else if (i == 1) { // This is the Flush_Layout case. bool tracingLayoutFlush = false; nsAutoTArray 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. nsIPresShell* shell = observers[j - 1]; if (!mLayoutFlushObservers.Contains(shell)) continue; if (!tracingLayoutFlush) { tracingLayoutFlush = true; profiler_tracing("Paint", "Reflow", mReflowCause, TRACING_INTERVAL_START); mReflowCause = nullptr; } NS_ADDREF(shell); mLayoutFlushObservers.RemoveElement(shell); shell->mReflowScheduled = false; shell->mSuppressInterruptibleReflows = false; mozFlushType flushType = HasPendingAnimations(shell) ? Flush_Layout : Flush_InterruptibleLayout; shell->FlushPendingNotifications(ChangesToFlush(flushType, false)); // Inform the FontFaceSet that we ticked, so that it can resolve its // ready promise if it needs to. nsPresContext* presContext = shell->GetPresContext(); if (presContext) { presContext->NotifyFontFaceSetOnRefresh(); } NS_RELEASE(shell); mNeedToRecomputeVisibility = true; } if (tracingLayoutFlush) { profiler_tracing("Paint", "Reflow", TRACING_INTERVAL_END); } } // The pres context may be destroyed during we do the flushing. if (!mPresContext || !mPresContext->GetPresShell()) { StopTimer(); return; } } // Recompute image 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->ScheduleImageVisibilityUpdate(); } /* * Perform notification to imgIRequests subscribed to listen * for refresh events. */ for (auto iter = mStartTable.Iter(); !iter.Done(); iter.Next()) { const uint32_t& delay = iter.Key(); ImageStartData* data = iter.UserData(); if (data->mStartTime) { TimeStamp& start = *data->mStartTime; TimeDuration prev = previousRefresh - 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 { // 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.Count()) { // 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. nsCOMArray imagesToRefresh(mRequests.Count()); for (auto iter = mRequests.Iter(); !iter.Done(); iter.Next()) { nsISupportsHashKey* entry = iter.Get(); auto req = static_cast(entry->GetKey()); MOZ_ASSERT(req, "Unable to retrieve the image request"); nsCOMPtr image; if (NS_SUCCEEDED(req->GetImage(getter_AddRefs(image)))) { imagesToRefresh.AppendElement(image); } } for (uint32_t i = 0; i < imagesToRefresh.Length(); i++) { imagesToRefresh[i]->RequestRefresh(aNowTime); } } for (nsIPresShell* shell : mPresShellsToInvalidateIfHidden) { shell->InvalidatePresShellIfHidden(); } mPresShellsToInvalidateIfHidden.Clear(); if (mViewManagerFlushIsPending) { RefPtr timelines = TimelineConsumers::Get(); nsTArray 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(timelines); MOZ_ASSERT(timelines->HasConsumer(docShell)); timelines->AddMarkerForDocShell(docShell, "Paint", MarkerTracingType::START); } #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Starting ProcessPendingUpdates\n"); } #endif mViewManagerFlushIsPending = false; RefPtr vm = mPresContext->GetPresShell()->GetViewManager(); vm->ProcessPendingUpdates(); #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Ending ProcessPendingUpdates\n"); } #endif for (nsDocShell* docShell : profilingDocShells) { MOZ_ASSERT(timelines); MOZ_ASSERT(timelines->HasConsumer(docShell)); timelines->AddMarkerForDocShell(docShell, "Paint", MarkerTracingType::END); } if (nsContentUtils::XPConnect()) { nsContentUtils::XPConnect()->NotifyDidPaint(); nsJSContext::NotifyDidPaint(); } } #ifndef ANDROID /* bug 1142079 */ mozilla::Telemetry::AccumulateTimeDelta(mozilla::Telemetry::REFRESH_DRIVER_TICK, mTickStart); #endif nsTObserverArray::ForwardIterator iter(mPostRefreshObservers); while (iter.HasMore()) { nsAPostRefreshObserver* observer = iter.GetNext(); observer->DidRefresh(); } ConfigureHighPrecision(); NS_ASSERTION(mInRefresh, "Still in refresh"); } void nsRefreshDriver::BeginRefreshingImages(RequestTable& aEntries, mozilla::TimeStamp aDesired) { for (auto iter = aEntries.Iter(); !iter.Done(); iter.Next()) { auto req = static_cast(iter.Get()->GetKey()); MOZ_ASSERT(req, "Unable to retrieve the image request"); mRequests.PutEntry(req); nsCOMPtr 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 (ObserverCount() || ImageRequestCount()) { // 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. NS_DispatchToCurrentThread(NS_NewRunnableMethod(this, &nsRefreshDriver::DoRefresh)); EnsureTimerStarted(); } } } void nsRefreshDriver::FinishedWaitingForTransaction() { mWaitingForTransaction = false; if (mSkippedPaints && !IsInRefresh() && (ObserverCount() || ImageRequestCount())) { profiler_tracing("Paint", "RD", TRACING_INTERVAL_START); DoRefresh(); profiler_tracing("Paint", "RD", TRACING_INTERVAL_END); } mSkippedPaints = false; } uint64_t nsRefreshDriver::GetTransactionId() { ++mPendingTransaction; if (mPendingTransaction >= mCompletedTransaction + 2 && !mWaitingForTransaction && !mTestControllingRefreshes) { mWaitingForTransaction = true; mSkippedPaints = false; } return mPendingTransaction; } void nsRefreshDriver::RevokeTransactionId(uint64_t aTransactionId) { MOZ_ASSERT(aTransactionId == mPendingTransaction); if (mPendingTransaction == mCompletedTransaction + 2 && mWaitingForTransaction) { MOZ_ASSERT(!mSkippedPaints, "How did we skip a paint when we're in the middle of one?"); FinishedWaitingForTransaction(); } mPendingTransaction--; } mozilla::TimeStamp nsRefreshDriver::GetTransactionStart() { return mTickStart; } void nsRefreshDriver::NotifyTransactionCompleted(uint64_t aTransactionId) { if (aTransactionId > mCompletedTransaction) { if (mPendingTransaction > mCompletedTransaction + 1 && mWaitingForTransaction) { mCompletedTransaction = aTransactionId; FinishedWaitingForTransaction(); } else { mCompletedTransaction = aTransactionId; } } } void nsRefreshDriver::WillRefresh(mozilla::TimeStamp aTime) { mRootRefresh->RemoveRefreshObserver(this, Flush_Style); mRootRefresh = nullptr; if (mSkippedPaints) { DoRefresh(); } } bool nsRefreshDriver::IsWaitingForPaint(mozilla::TimeStamp aTime) { if (mTestControllingRefreshes) { return false; } // If we've skipped too many ticks then it's possible // that something went wrong and we're waiting on // a notification that will never arrive. if (aTime > (mMostRecentTick + TimeDuration::FromMilliseconds(200))) { mSkippedPaints = false; mWaitingForTransaction = false; if (mRootRefresh) { mRootRefresh->RemoveRefreshObserver(this, Flush_Style); } return false; } if (mWaitingForTransaction) { mSkippedPaints = true; return true; } // Try find the 'root' refresh driver for the current window and check // if that is waiting for a paint. nsPresContext *rootContext = PresContext()->GetRootPresContext(); if (rootContext) { nsRefreshDriver *rootRefresh = rootContext->RefreshDriver(); if (rootRefresh && rootRefresh != this) { if (rootRefresh->IsWaitingForPaint(aTime)) { if (mRootRefresh != rootRefresh) { if (mRootRefresh) { mRootRefresh->RemoveRefreshObserver(this, Flush_Style); } rootRefresh->AddRefreshObserver(this, Flush_Style); mRootRefresh = rootRefresh; } mSkippedPaints = true; return true; } } } return false; } void nsRefreshDriver::SetThrottled(bool aThrottled) { if (aThrottled != mThrottled) { mThrottled = aThrottled; if (mActiveTimer) { // We want to switch our timer type here, so just stop and // restart the timer. EnsureTimerStarted(eAdjustingTimer); } } } /*static*/ void nsRefreshDriver::PVsyncActorCreated(VsyncChild* aVsyncChild) { MOZ_ASSERT(NS_IsMainThread()); MOZ_ASSERT(!XRE_IsParentProcess()); VsyncRefreshDriverTimer* vsyncRefreshDriverTimer = new VsyncRefreshDriverTimer(aVsyncChild); // If we are using software timer, swap current timer to // VsyncRefreshDriverTimer. if (sRegularRateTimer) { sRegularRateTimer->SwapRefreshDrivers(vsyncRefreshDriverTimer); delete sRegularRateTimer; } sRegularRateTimer = vsyncRefreshDriverTimer; } 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, mozFlushType aFlushType) { ObserverArray& array = ArrayFor(aFlushType); return array.Contains(aObserver); } #endif void nsRefreshDriver::ScheduleViewManagerFlush() { NS_ASSERTION(mPresContext->IsRoot(), "Should only schedule view manager flush on root prescontexts"); mViewManagerFlushIsPending = true; EnsureTimerStarted(); } void nsRefreshDriver::ScheduleFrameRequestCallbacks(nsIDocument* 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 ConfigureHighPrecision(); EnsureTimerStarted(); } void nsRefreshDriver::RevokeFrameRequestCallbacks(nsIDocument* aDocument) { mFrameRequestCallbackDocs.RemoveElement(aDocument); mThrottledFrameRequestCallbackDocs.RemoveElement(aDocument); ConfigureHighPrecision(); // 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::ScheduleEventDispatch(nsINode* aTarget, nsIDOMEvent* aEvent) { mPendingEvents.AppendElement(PendingEvent{aTarget, aEvent}); // make sure that the timer is running EnsureTimerStarted(); } void nsRefreshDriver::CancelPendingEvents(nsIDocument* aDocument) { for (auto i : Reversed(MakeRange(mPendingEvents.Length()))) { if (mPendingEvents[i].mTarget->OwnerDoc() == aDocument) { mPendingEvents.RemoveElementAt(i); } } } /* static */ bool nsRefreshDriver::IsJankCritical() { MOZ_ASSERT(NS_IsMainThread()); return sActiveVsyncTimers > 0; } #undef LOG