nsRefreshDriver.cpp
/* -*- 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 <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/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 "mozilla/RestyleManager.h"
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.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"
#include "nsIDOMEvent.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;
// The latest value of process-wide jank levels.
//
// For each i, sJankLevels[i] counts the number of times delivery of
// vsync to the main thread has been delayed by at least 2^i ms. Use
// GetJankLevels to grab a copy of this array.
uint64_t sJankLevels[12];
}
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<RefPtr<nsRefreshDriver>>& aDrivers)
{
if (aDrivers.IsEmpty()) {
return;
}
nsTArray<RefPtr<nsRefreshDriver> > 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<RefPtr<nsRefreshDriver> > mContentRefreshDrivers;
nsTArray<RefPtr<nsRefreshDriver> > 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<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 = 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<uint32_t>(mRateMilliseconds);
mTimer->InitWithFuncCallback(TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT);
}
virtual void StopTimer()
{
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:
VsyncRefreshDriverTimer()
: mVsyncChild(nullptr)
{
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
mVsyncObserver = new RefreshDriverVsyncObserver(this);
RefPtr<mozilla::gfx::VsyncSource> 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
{
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<nsIRunnable> vsyncEvent =
NewRunnableMethod<TimeStamp>(this,
&RefreshDriverVsyncObserver::TickRefreshDriver,
aVsyncTimestamp);
NS_DispatchToMainThread(vsyncEvent);
} else {
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);
RecordJank(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);
RecordJank(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 RecordJank(uint32_t aJankMS)
{
uint32_t duration = 1 /* ms */;
for (size_t i = 0;
i < mozilla::ArrayLength(sJankLevels) && duration < aJankMS;
++i, duration *= 2) {
sJankLevels[i]++;
}
}
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<RefreshDriverVsyncObserver> mVsyncObserver;
// Used for parent process.
RefPtr<RefreshTimerVsyncDispatcher> 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<VsyncChild> 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<uint32_t>((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<uint32_t>(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<uint32_t>(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<RefPtr<nsRefreshDriver> > 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<InactiveRefreshDriverTimer*>(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<layout::VsyncChild*>(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<nsIIPCBackgroundChildCreateCallback> callback = new VsyncChildCreateCallback();
if (NS_WARN_IF(!BackgroundChild::GetOrCreateForCurrentThread(callback))) {
MOZ_CRASH("PVsync actor create failed!");
}
}
static void
CreateVsyncRefreshTimer()
{
MOZ_ASSERT(NS_IsMainThread());
PodArrayZero(sJankLevels);
// 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<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::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 1000.0 / 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),
mResizeSuppressed(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<nsRefreshDriver*>(this)->EnsureTimerStarted();
return mMostRecentRefresh;
}
int64_t
nsRefreshDriver::MostRecentRefreshEpochTime() const
{
const_cast<nsRefreshDriver*>(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 & eForceAdjustTimer))
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);
}
// 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. 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<nsITimer> 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<ObserverArray*>(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<nsIDocument> mDocument;
nsIDocument::FrameRequestCallbackList mCallbacks;
};
static nsDocShell* GetDocShell(nsPresContext* aPresContext)
{
return static_cast<nsDocShell*>(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<nsDocShell*>& aShells)
{
if (!aRootDocShell) {
return;
}
RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
if (!timelines || timelines->IsEmpty()) {
return;
}
nsCOMPtr<nsISimpleEnumerator> enumerator;
nsresult rv = aRootDocShell->GetDocShellEnumerator(
nsIDocShellTreeItem::typeAll,
nsIDocShell::ENUMERATE_BACKWARDS,
getter_AddRefs(enumerator));
if (NS_FAILED(rv)) {
return;
}
nsCOMPtr<nsIDocShell> curItem;
bool hasMore = false;
while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore) {
nsCOMPtr<nsISupports> curSupports;
enumerator->GetNext(getter_AddRefs(curSupports));
curItem = do_QueryInterface(curSupports);
if (!curItem || !curItem->GetRecordProfileTimelineMarkers()) {
continue;
}
nsDocShell* shell = static_cast<nsDocShell*>(curItem.get());
bool isVisible = false;
shell->GetVisibility(&isVisible);
if (!isVisible) {
continue;
}
aShells.AppendElement(shell);
}
}
static void
TakeFrameRequestCallbacksFrom(nsIDocument* aDocument,
nsTArray<DocumentFrameCallbacks>& aTarget)
{
aTarget.AppendElement(aDocument);
aDocument->TakeFrameRequestCallbacks(aTarget.LastElement().mCallbacks);
}
void
nsRefreshDriver::DispatchPendingEvents()
{
// Swap out the current pending events
nsTArray<PendingEvent> pendingEvents(Move(mPendingEvents));
for (PendingEvent& event : pendingEvents) {
bool dummy;
event.mTarget->DispatchEvent(event.mEvent, &dummy);
}
}
static bool
CollectDocuments(nsIDocument* aDocument, void* aDocArray)
{
static_cast<nsCOMArray<nsIDocument>*>(aDocArray)->AppendObject(aDocument);
aDocument->EnumerateSubDocuments(CollectDocuments, aDocArray);
return true;
}
void
nsRefreshDriver::DispatchAnimationEvents()
{
if (!mPresContext) {
return;
}
nsCOMArray<nsIDocument> 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<nsPresContext> 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<DocumentFrameCallbacks>
frameRequestCallbacks(mFrameRequestCallbackDocs.Length() +
mThrottledFrameRequestCallbackDocs.Length());
// First, grab throttled frame request callbacks.
{
nsTArray<nsIDocument*> 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.
nsPIDOMWindowInner* 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<nsIPresShell> 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;
}
mResizeSuppressed = false;
AutoRestore<bool> restoreInRefresh(mInRefresh);
mInRefresh = true;
AutoRestore<TimeStamp> restoreTickStart(mTickStart);
mTickStart = TimeStamp::Now();
gfxPlatform::GetPlatform()->SchedulePaintIfDeviceReset();
// We want to process any pending APZ metrics ahead of their positions
// in the queue. This will prevent us from spending precious time
// painting a stale displayport.
if (gfxPrefs::APZPeekMessages()) {
nsLayoutUtils::UpdateDisplayPortMarginsFromPendingMessages();
}
/*
* 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<nsARefreshObserver> 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;
AutoTArray<nsIPresShell*, 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.
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);
RestyleManagerHandle restyleManager =
shell->GetPresContext()->RestyleManager();
// XXX stylo: ServoRestyleManager does not observer the refresh driver yet.
if (restyleManager->IsGecko()) {
restyleManager->AsGecko()->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);
}
}
} else if (i == 1) {
// This is the Flush_Layout case.
bool tracingLayoutFlush = false;
AutoTArray<nsIPresShell*, 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.
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 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();
}
/*
* 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<imgIContainer> imagesToRefresh(mRequests.Count());
for (auto iter = mRequests.Iter(); !iter.Done(); iter.Next()) {
nsISupportsHashKey* entry = iter.Get();
auto req = static_cast<imgIRequest*>(entry->GetKey());
MOZ_ASSERT(req, "Unable to retrieve the image request");
nsCOMPtr<imgIContainer> 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<TimelineConsumers> timelines = TimelineConsumers::Get();
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(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<nsViewManager> 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<nsAPostRefreshObserver*>::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<imgIRequest*>(iter.Get()->GetKey());
MOZ_ASSERT(req, "Unable to retrieve the image request");
mRequests.PutEntry(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 (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(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;
}
uint64_t
nsRefreshDriver::LastTransactionId() const
{
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(eForceAdjustTimer);
}
}
}
/*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(eNeverAdjustTimer);
}
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;
}
/* static */ bool
nsRefreshDriver::GetJankLevels(Vector<uint64_t>& aJank) {
aJank.clear();
return aJank.append(sJankLevels, ArrayLength(sJankLevels));
}
#undef LOG
