Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Code to notify things that animate before a refresh, at an appropriate
* refresh rate. (Perhaps temporary, until replaced by compositor.)
*
* Chrome and each tab have their own RefreshDriver, which in turn
* hooks into one of a few global timer based on RefreshDriverTimer,
* defined below. There are two main global timers -- one for active
* animations, and one for inactive ones. These are implemented as
* subclasses of RefreshDriverTimer; see below for a description of
* their implementations. In the future, additional timer types may
* implement things like blocking on vsync.
*/
#include "nsRefreshDriver.h"
#include "mozilla/DataMutex.h"
#include "nsThreadUtils.h"
#ifdef XP_WIN
# include <windows.h>
// mmsystem isn't part of WIN32_LEAN_AND_MEAN, so we have
// to manually include it
# include <mmsystem.h>
# include "WinUtils.h"
#endif
#include "mozilla/AnimationEventDispatcher.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/InputTaskManager.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/FontTableURIProtocolHandler.h"
#include "nsITimer.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "nsIXULRuntime.h"
#include "jsapi.h"
#include "nsContentUtils.h"
#include "mozilla/PendingAnimationTracker.h"
#include "mozilla/PendingFullscreenEvent.h"
#include "mozilla/dom/PerformanceMainThread.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_idle_period.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_page_load.h"
#include "nsViewManager.h"
#include "GeckoProfiler.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/CallbackDebuggerNotification.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/Performance.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/VsyncMainChild.h"
#include "mozilla/dom/WindowBinding.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/TaskController.h"
#include "Layers.h"
#include "imgIContainer.h"
#include "mozilla/dom/ScriptSettings.h"
#include "nsDocShell.h"
#include "nsISimpleEnumerator.h"
#include "nsJSEnvironment.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "VsyncSource.h"
#include "mozilla/VsyncDispatcher.h"
#include "mozilla/Unused.h"
#include "mozilla/TimelineConsumers.h"
#include "nsAnimationManager.h"
#include "nsDisplayList.h"
#include "nsDOMNavigationTiming.h"
#include "nsTransitionManager.h"
#if defined(MOZ_WIDGET_ANDROID)
# include "VRManagerChild.h"
#endif // defined(MOZ_WIDGET_ANDROID)
#include "nsXULPopupManager.h"
#include <numeric>
using namespace mozilla;
using namespace mozilla::widget;
using namespace mozilla::ipc;
using namespace mozilla::dom;
using namespace mozilla::layout;
static mozilla::LazyLogModule sRefreshDriverLog("nsRefreshDriver");
#define LOG(...) \
MOZ_LOG(sRefreshDriverLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
// after 10 minutes, stop firing off inactive timers
#define DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS 600
// The number of seconds spent skipping frames because we are waiting for the
// compositor before logging.
#if defined(MOZ_ASAN)
# define REFRESH_WAIT_WARNING 5
#elif defined(DEBUG) && !defined(MOZ_VALGRIND)
# define REFRESH_WAIT_WARNING 5
#elif defined(DEBUG) && defined(MOZ_VALGRIND)
# define REFRESH_WAIT_WARNING (RUNNING_ON_VALGRIND ? 20 : 5)
#elif defined(MOZ_VALGRIND)
# define REFRESH_WAIT_WARNING (RUNNING_ON_VALGRIND ? 10 : 1)
#else
# define REFRESH_WAIT_WARNING 1
#endif
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(nsRefreshDriver::TickReasons);
namespace {
// The number outstanding nsRefreshDrivers (that have been created but not
// disconnected). When this reaches zero we will call
// nsRefreshDriver::Shutdown.
static uint32_t sRefreshDriverCount = 0;
// RAII-helper for recording elapsed duration for refresh tick phases.
class AutoRecordPhase {
public:
explicit AutoRecordPhase(double* aResultMs)
: mTotalMs(aResultMs), mStartTime(TimeStamp::Now()) {
MOZ_ASSERT(mTotalMs);
}
~AutoRecordPhase() {
*mTotalMs = (TimeStamp::Now() - mStartTime).ToMilliseconds();
}
private:
double* mTotalMs;
mozilla::TimeStamp mStartTime;
};
} // namespace
namespace mozilla {
static TimeStamp sMostRecentHighRateVsync;
/*
* The base class for all global refresh driver timers. It takes care
* of managing the list of refresh drivers attached to them and
* provides interfaces for querying/setting the rate and actually
* running a timer 'Tick'. Subclasses must implement StartTimer(),
* StopTimer(), and ScheduleNextTick() -- the first two just
* start/stop whatever timer mechanism is in use, and ScheduleNextTick
* is called at the start of the Tick() implementation to set a time
* for the next tick.
*/
class RefreshDriverTimer {
public:
RefreshDriverTimer() = default;
NS_INLINE_DECL_REFCOUNTING(RefreshDriverTimer)
virtual void AddRefreshDriver(nsRefreshDriver* aDriver) {
LOG("[%p] AddRefreshDriver %p", this, aDriver);
bool startTimer =
mContentRefreshDrivers.IsEmpty() && mRootRefreshDrivers.IsEmpty();
if (IsRootRefreshDriver(aDriver)) {
NS_ASSERTION(!mRootRefreshDrivers.Contains(aDriver),
"Adding a duplicate root refresh driver!");
mRootRefreshDrivers.AppendElement(aDriver);
} else {
NS_ASSERTION(!mContentRefreshDrivers.Contains(aDriver),
"Adding a duplicate content refresh driver!");
mContentRefreshDrivers.AppendElement(aDriver);
}
if (startTimer) {
StartTimer();
}
}
void RemoveRefreshDriver(nsRefreshDriver* aDriver) {
LOG("[%p] RemoveRefreshDriver %p", this, aDriver);
if (IsRootRefreshDriver(aDriver)) {
NS_ASSERTION(mRootRefreshDrivers.Contains(aDriver),
"RemoveRefreshDriver for a refresh driver that's not in the "
"root refresh list!");
mRootRefreshDrivers.RemoveElement(aDriver);
} else {
nsPresContext* pc = aDriver->GetPresContext();
nsPresContext* rootContext = pc ? pc->GetRootPresContext() : nullptr;
// During PresContext shutdown, we can't accurately detect
// if a root refresh driver exists or not. Therefore, we have to
// search and find out which list this driver exists in.
if (!rootContext) {
if (mRootRefreshDrivers.Contains(aDriver)) {
mRootRefreshDrivers.RemoveElement(aDriver);
} else {
NS_ASSERTION(mContentRefreshDrivers.Contains(aDriver),
"RemoveRefreshDriver without a display root for a "
"driver that is not in the content refresh list");
mContentRefreshDrivers.RemoveElement(aDriver);
}
} else {
NS_ASSERTION(mContentRefreshDrivers.Contains(aDriver),
"RemoveRefreshDriver for a driver that is not in the "
"content refresh list");
mContentRefreshDrivers.RemoveElement(aDriver);
}
}
bool stopTimer =
mContentRefreshDrivers.IsEmpty() && mRootRefreshDrivers.IsEmpty();
if (stopTimer) {
StopTimer();
}
}
TimeStamp MostRecentRefresh() const { return mLastFireTime; }
VsyncId MostRecentRefreshVsyncId() const { return mLastFireId; }
virtual TimeDuration GetTimerRate() = 0;
TimeStamp GetIdleDeadlineHint(TimeStamp aDefault) {
MOZ_ASSERT(NS_IsMainThread());
TimeStamp mostRecentRefresh = MostRecentRefresh();
TimeDuration refreshPeriod = GetTimerRate();
TimeStamp idleEnd = mostRecentRefresh + refreshPeriod;
bool inHighRateMode = nsRefreshDriver::IsInHighRateMode();
// If we haven't painted for some time, then guess that we won't paint
// again for a while, so the refresh driver is not a good way to predict
// idle time.
if (!inHighRateMode &&
(idleEnd +
refreshPeriod *
StaticPrefs::layout_idle_period_required_quiescent_frames() <
TimeStamp::Now())) {
return aDefault;
}
// End the predicted idle time a little early, the amount controlled by a
// pref, to prevent overrunning the idle time and delaying a frame.
// But do that only if we aren't in high rate mode.
idleEnd =
idleEnd -
TimeDuration::FromMilliseconds(
inHighRateMode ? 0 : StaticPrefs::layout_idle_period_time_limit());
return idleEnd < aDefault ? idleEnd : aDefault;
}
Maybe<TimeStamp> GetNextTickHint() {
MOZ_ASSERT(NS_IsMainThread());
TimeStamp nextTick = MostRecentRefresh() + GetTimerRate();
return nextTick < TimeStamp::Now() ? Nothing() : Some(nextTick);
}
// Returns null if the RefreshDriverTimer is attached to several
// RefreshDrivers. That may happen for example when there are
// several windows open.
nsPresContext* GetPresContextForOnlyRefreshDriver() {
if (mRootRefreshDrivers.Length() == 1 && mContentRefreshDrivers.IsEmpty()) {
return mRootRefreshDrivers[0]->GetPresContext();
}
if (mContentRefreshDrivers.Length() == 1 && mRootRefreshDrivers.IsEmpty()) {
return mContentRefreshDrivers[0]->GetPresContext();
}
return nullptr;
}
bool IsAnyToplevelContentPageLoading() {
for (nsTArray<RefPtr<nsRefreshDriver>>* drivers :
{&mRootRefreshDrivers, &mContentRefreshDrivers}) {
for (RefPtr<nsRefreshDriver>& driver : *drivers) {
if (nsPresContext* pc = driver->GetPresContext()) {
if (pc->Document()->IsTopLevelContentDocument() &&
pc->Document()->GetReadyStateEnum() <
Document::READYSTATE_COMPLETE) {
return true;
}
}
}
}
return false;
}
protected:
virtual ~RefreshDriverTimer() {
MOZ_ASSERT(
mContentRefreshDrivers.Length() == 0,
"Should have removed all content refresh drivers from here by now!");
MOZ_ASSERT(
mRootRefreshDrivers.Length() == 0,
"Should have removed all root refresh drivers from here by now!");
}
virtual void StartTimer() = 0;
virtual void StopTimer() = 0;
virtual void ScheduleNextTick(TimeStamp aNowTime) = 0;
public:
virtual bool IsTicking() const = 0;
protected:
bool IsRootRefreshDriver(nsRefreshDriver* aDriver) {
nsPresContext* pc = aDriver->GetPresContext();
nsPresContext* rootContext = pc ? pc->GetRootPresContext() : nullptr;
if (!rootContext) {
return false;
}
return aDriver == rootContext->RefreshDriver();
}
/*
* Actually runs a tick, poking all the attached RefreshDrivers.
* Grabs the "now" time via TimeStamp::Now().
*/
void Tick() {
TimeStamp now = TimeStamp::Now();
Tick(VsyncId(), now);
}
void TickRefreshDrivers(VsyncId aId, TimeStamp aNow,
nsTArray<RefPtr<nsRefreshDriver>>& aDrivers) {
if (aDrivers.IsEmpty()) {
return;
}
for (nsRefreshDriver* driver : aDrivers.Clone()) {
// don't poke this driver if it's in test mode
if (driver->IsTestControllingRefreshesEnabled()) {
continue;
}
TickDriver(driver, aId, aNow);
}
}
/*
* Tick the refresh drivers based on the given timestamp.
*/
void Tick(VsyncId aId, TimeStamp now) {
ScheduleNextTick(now);
mLastFireTime = now;
mLastFireId = aId;
LOG("[%p] ticking drivers...", this);
TickRefreshDrivers(aId, now, mContentRefreshDrivers);
TickRefreshDrivers(aId, now, mRootRefreshDrivers);
LOG("[%p] done.", this);
}
static void TickDriver(nsRefreshDriver* driver, VsyncId aId, TimeStamp now) {
driver->Tick(aId, now);
}
TimeStamp mLastFireTime;
VsyncId mLastFireId;
TimeStamp mTargetTime;
nsTArray<RefPtr<nsRefreshDriver>> mContentRefreshDrivers;
nsTArray<RefPtr<nsRefreshDriver>> mRootRefreshDrivers;
// useful callback for nsITimer-based derived classes, here
// because of c++ protected shenanigans
static void TimerTick(nsITimer* aTimer, void* aClosure) {
RefPtr<RefreshDriverTimer> timer =
static_cast<RefreshDriverTimer*>(aClosure);
timer->Tick();
}
};
/*
* A RefreshDriverTimer that uses a nsITimer as the underlying timer. Note that
* this is a ONE_SHOT timer, not a repeating one! Subclasses are expected to
* implement ScheduleNextTick and intelligently calculate the next time to tick,
* and to reset mTimer. Using a repeating nsITimer gets us into a lot of pain
* with its attempt at intelligent slack removal and such, so we don't do it.
*/
class SimpleTimerBasedRefreshDriverTimer : public RefreshDriverTimer {
public:
/*
* aRate -- the delay, in milliseconds, requested between timer firings
*/
explicit SimpleTimerBasedRefreshDriverTimer(double aRate) {
SetRate(aRate);
mTimer = NS_NewTimer();
}
virtual ~SimpleTimerBasedRefreshDriverTimer() override { StopTimer(); }
// will take effect at next timer tick
virtual void SetRate(double aNewRate) {
mRateMilliseconds = aNewRate;
mRateDuration = TimeDuration::FromMilliseconds(mRateMilliseconds);
}
double GetRate() const { return mRateMilliseconds; }
TimeDuration GetTimerRate() override { return mRateDuration; }
protected:
void StartTimer() override {
// pretend we just fired, and we schedule the next tick normally
mLastFireTime = TimeStamp::Now();
mLastFireId = VsyncId();
mTargetTime = mLastFireTime + mRateDuration;
uint32_t delay = static_cast<uint32_t>(mRateMilliseconds);
mTimer->InitWithNamedFuncCallback(
TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT,
"SimpleTimerBasedRefreshDriverTimer::StartTimer");
}
void StopTimer() override { mTimer->Cancel(); }
double mRateMilliseconds;
TimeDuration mRateDuration;
RefPtr<nsITimer> mTimer;
};
/*
* A refresh driver that listens to vsync events and ticks the refresh driver
* on vsync intervals. We throttle the refresh driver if we get too many
* vsync events and wait to catch up again.
*/
class VsyncRefreshDriverTimer : public RefreshDriverTimer {
public:
// This is used in the parent process for all platforms except Linux Wayland.
static RefPtr<VsyncRefreshDriverTimer>
CreateForParentProcessWithGlobalVsync() {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(NS_IsMainThread());
RefPtr<VsyncDispatcher> vsyncDispatcher =
gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher();
RefPtr<VsyncRefreshDriverTimer> timer =
new VsyncRefreshDriverTimer(std::move(vsyncDispatcher), nullptr);
return timer.forget();
}
// This is used in the parent process for Linux Wayland only, where we have a
// per-widget VsyncSource which is independent from the gfxPlatform's global
// VsyncSource.
static RefPtr<VsyncRefreshDriverTimer>
CreateForParentProcessWithLocalVsyncDispatcher(
RefPtr<VsyncDispatcher>&& aVsyncDispatcher) {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(NS_IsMainThread());
RefPtr<VsyncRefreshDriverTimer> timer =
new VsyncRefreshDriverTimer(std::move(aVsyncDispatcher), nullptr);
return timer.forget();
}
// This is used in the content process.
static RefPtr<VsyncRefreshDriverTimer> CreateForContentProcess(
RefPtr<VsyncMainChild>&& aVsyncChild) {
MOZ_RELEASE_ASSERT(XRE_IsContentProcess());
MOZ_RELEASE_ASSERT(NS_IsMainThread());
RefPtr<VsyncRefreshDriverTimer> timer =
new VsyncRefreshDriverTimer(nullptr, std::move(aVsyncChild));
return timer.forget();
}
TimeDuration GetTimerRate() override {
if (mVsyncDispatcher) {
mVsyncRate = mVsyncDispatcher->GetVsyncRate();
} else if (mVsyncChild) {
mVsyncRate = mVsyncChild->GetVsyncRate();
}
// If hardware queries fail / are unsupported, we have to just guess.
return mVsyncRate != TimeDuration::Forever()
? mVsyncRate
: TimeDuration::FromMilliseconds(1000.0 / 60.0);
}
private:
// RefreshDriverVsyncObserver redirects vsync notifications to the main thread
// and calls VsyncRefreshDriverTimer::NotifyVsyncOnMainThread on it. It also
// acts as a weak reference to the refresh driver timer, dropping its
// reference when RefreshDriverVsyncObserver::Shutdown is called from the
// timer's destructor.
//
// RefreshDriverVsyncObserver::NotifyVsync is called from different places
// depending on the process type.
//
// Parent process:
// NotifyVsync is called by RefreshDriverVsyncDispatcher, on a background
// thread. RefreshDriverVsyncDispatcher keeps strong references to its
// VsyncObservers, both in its array of observers and while calling
// NotifyVsync. So it might drop its last reference to the observer on a
// background thread. This means that the VsyncRefreshDriverTimer itself can't
// be the observer (because its destructor would potentially be run on a
// background thread), and it's why we use this separate class.
//
// Child process:
// NotifyVsync is called by VsyncMainChild, on the main thread.
// VsyncMainChild keeps raw pointers to its observers.
class RefreshDriverVsyncObserver final : public VsyncObserver {
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(
VsyncRefreshDriverTimer::RefreshDriverVsyncObserver, override)
public:
explicit RefreshDriverVsyncObserver(
VsyncRefreshDriverTimer* aVsyncRefreshDriverTimer)
: mVsyncRefreshDriverTimer(aVsyncRefreshDriverTimer),
mLastPendingVsyncNotification(
"RefreshDriverVsyncObserver::mLastPendingVsyncNotification") {
MOZ_ASSERT(NS_IsMainThread());
}
void NotifyVsync(const VsyncEvent& aVsync) override {
// Compress vsync notifications such that only 1 may run at a time
// This is so that we don't flood the refresh driver with vsync messages
// if the main thread is blocked for long periods of time
{ // scope lock
auto pendingVsync = mLastPendingVsyncNotification.Lock();
bool hadPendingVsync = pendingVsync->isSome();
*pendingVsync = Some(aVsync);
if (hadPendingVsync) {
return;
}
}
if (XRE_IsContentProcess()) {
// In the content process, NotifyVsync is called by VsyncMainChild on
// the main thread. No need to use a runnable, just call
// NotifyVsyncTimerOnMainThread() directly.
NotifyVsyncTimerOnMainThread();
return;
}
// In the parent process, NotifyVsync is called on the vsync thread, which
// on most platforms is different from the main thread, so we need to
// dispatch a runnable for running NotifyVsyncTimerOnMainThread on the
// main thread.
// TODO: On Linux Wayland, the vsync thread is currently the main thread,
// and yet we still dispatch the runnable. Do we need to?
bool useVsyncPriority = mozilla::BrowserTabsRemoteAutostart();
nsCOMPtr<nsIRunnable> vsyncEvent = new PrioritizableRunnable(
NS_NewRunnableFunction(
"RefreshDriverVsyncObserver::NotifyVsyncTimerOnMainThread",
[self = RefPtr{this}]() {
self->NotifyVsyncTimerOnMainThread();
}),
useVsyncPriority ? nsIRunnablePriority::PRIORITY_VSYNC
: nsIRunnablePriority::PRIORITY_NORMAL);
NS_DispatchToMainThread(vsyncEvent);
}
void NotifyVsyncTimerOnMainThread() {
MOZ_ASSERT(NS_IsMainThread());
if (!mVsyncRefreshDriverTimer) {
// Ignore calls after Shutdown.
return;
}
VsyncEvent vsyncEvent;
{
// Get the last of the queued-up vsync notifications.
auto pendingVsync = mLastPendingVsyncNotification.Lock();
MOZ_RELEASE_ASSERT(
pendingVsync->isSome(),
"We should always have a pending vsync notification here.");
vsyncEvent = pendingVsync->extract();
}
// Call VsyncRefreshDriverTimer::NotifyVsyncOnMainThread, and keep a
// strong reference to it while calling the method.
RefPtr<VsyncRefreshDriverTimer> timer = mVsyncRefreshDriverTimer;
timer->NotifyVsyncOnMainThread(vsyncEvent);
}
void Shutdown() {
MOZ_ASSERT(NS_IsMainThread());
mVsyncRefreshDriverTimer = nullptr;
}
private:
~RefreshDriverVsyncObserver() = default;
// VsyncRefreshDriverTimer holds this RefreshDriverVsyncObserver and it will
// be always available before Shutdown(). We can just use the raw pointer
// here.
// Only accessed on the main thread.
VsyncRefreshDriverTimer* mVsyncRefreshDriverTimer;
// Non-empty between a call to NotifyVsync and a call to
// NotifyVsyncOnMainThread. When multiple vsync notifications have been
// received between those two calls, this contains the last of the pending
// notifications. This is used both in the parent process and in the child
// process, but it only does something useful in the parent process. In the
// child process, both calls happen on the main thread right after one
// another, so there's only one notification to keep track of; vsync
// notification coalescing for child processes happens at the IPC level
// instead.
DataMutex<Maybe<VsyncEvent>> mLastPendingVsyncNotification;
}; // RefreshDriverVsyncObserver
VsyncRefreshDriverTimer(RefPtr<VsyncDispatcher>&& aVsyncDispatcher,
RefPtr<VsyncMainChild>&& aVsyncChild)
: mVsyncDispatcher(aVsyncDispatcher),
mVsyncChild(aVsyncChild),
mVsyncRate(TimeDuration::Forever()),
mRecentVsync(TimeStamp::Now()),
mLastTickStart(TimeStamp::Now()),
mLastIdleTaskCount(0),
mLastRunOutOfMTTasksCount(0),
mProcessedVsync(true) {
mVsyncObserver = new RefreshDriverVsyncObserver(this);
}
~VsyncRefreshDriverTimer() override {
if (mVsyncDispatcher) {
mVsyncDispatcher->RemoveVsyncObserver(mVsyncObserver);
mVsyncDispatcher = nullptr;
} else if (mVsyncChild) {
mVsyncChild->RemoveChildRefreshTimer(mVsyncObserver);
mVsyncChild = nullptr;
}
// Detach current vsync timer from this VsyncObserver. The observer will no
// longer tick this timer.
mVsyncObserver->Shutdown();
mVsyncObserver = nullptr;
}
bool ShouldGiveNonVsyncTasksMoreTime() {
TaskController* taskController = TaskController::Get();
IdleTaskManager* idleTaskManager = taskController->GetIdleTaskManager();
// Note, pendingTaskCount includes also all the pending idle tasks.
uint64_t pendingTaskCount =
taskController->PendingMainthreadTaskCountIncludingSuspended();
uint64_t pendingIdleTaskCount = idleTaskManager->PendingTaskCount();
MOZ_ASSERT(pendingTaskCount >= pendingIdleTaskCount);
uint64_t idleTaskCount = idleTaskManager->ProcessedTaskCount();
// If we haven't processed new idle tasks and we have pending
// non-idle tasks, give those non-idle tasks more time,
// but only if the main thread wasn't totally empty at some point.
// In the parent process RunOutOfMTTasksCount() is less meaningful
// because some of the tasks run through AppShell.
return mLastIdleTaskCount == idleTaskCount &&
pendingTaskCount > pendingIdleTaskCount &&
(taskController->RunOutOfMTTasksCount() ==
mLastRunOutOfMTTasksCount ||
XRE_IsParentProcess());
}
void NotifyVsyncOnMainThread(const VsyncEvent& aVsyncEvent) {
MOZ_ASSERT(NS_IsMainThread());
// This clears the input handling start time.
InputTaskManager::Get()->SetInputHandlingStartTime(TimeStamp());
mRecentVsync = aVsyncEvent.mTime;
mRecentVsyncId = aVsyncEvent.mId;
if (!mSuspendVsyncPriorityTicksUntil.IsNull() &&
mSuspendVsyncPriorityTicksUntil > aVsyncEvent.mTime) {
if (ShouldGiveNonVsyncTasksMoreTime()) {
// Wait for the next tick.
return;
}
// Clear the value since we aren't blocking anymore because there aren't
// any non-idle tasks to process.
mSuspendVsyncPriorityTicksUntil = TimeStamp();
}
if (StaticPrefs::layout_lower_priority_refresh_driver_during_load() &&
ShouldGiveNonVsyncTasksMoreTime()) {
nsPresContext* pctx = GetPresContextForOnlyRefreshDriver();
if (pctx && pctx->HadContentfulPaint() && pctx->Document() &&
pctx->Document()->GetReadyStateEnum() <
Document::READYSTATE_COMPLETE) {
nsPIDOMWindowInner* win = pctx->Document()->GetInnerWindow();
uint32_t frameRateMultiplier = pctx->GetNextFrameRateMultiplier();
if (!frameRateMultiplier) {
pctx->DidUseFrameRateMultiplier();
}
if (win && frameRateMultiplier) {
dom::Performance* perf = win->GetPerformance();
// Limit slower refresh rate to 5 seconds between the
// first contentful paint and page load.
if (perf &&
perf->Now() < StaticPrefs::page_load_deprioritization_period()) {
if (mProcessedVsync) {
mProcessedVsync = false;
TimeDuration rate = GetTimerRate();
uint32_t slowRate = static_cast<uint32_t>(rate.ToMilliseconds() *
frameRateMultiplier);
pctx->DidUseFrameRateMultiplier();
nsCOMPtr<nsIRunnable> vsyncEvent = NewRunnableMethod<>(
"VsyncRefreshDriverTimer::IdlePriorityNotify", this,
&VsyncRefreshDriverTimer::IdlePriorityNotify);
NS_DispatchToCurrentThreadQueue(vsyncEvent.forget(), slowRate,
EventQueuePriority::Idle);
}
return;
}
}
}
}
TickRefreshDriver(aVsyncEvent.mId, aVsyncEvent.mTime);
}
void RecordTelemetryProbes(TimeStamp aVsyncTimestamp) {
MOZ_ASSERT(NS_IsMainThread());
#ifndef ANDROID /* bug 1142079 */
if (XRE_IsParentProcess()) {
TimeDuration vsyncLatency = TimeStamp::Now() - aVsyncTimestamp;
uint32_t sample = (uint32_t)vsyncLatency.ToMilliseconds();
Telemetry::Accumulate(Telemetry::FX_REFRESH_DRIVER_CHROME_FRAME_DELAY_MS,
sample);
Telemetry::Accumulate(
Telemetry::FX_REFRESH_DRIVER_SYNC_SCROLL_FRAME_DELAY_MS, sample);
} else if (mVsyncRate != TimeDuration::Forever()) {
TimeDuration contentDelay =
(TimeStamp::Now() - mLastTickStart) - mVsyncRate;
if (contentDelay.ToMilliseconds() < 0) {
// Vsyncs are noisy and some can come at a rate quicker than
// the reported hardware rate. In those cases, consider that we have 0
// delay.
contentDelay = TimeDuration::FromMilliseconds(0);
}
uint32_t sample = (uint32_t)contentDelay.ToMilliseconds();
Telemetry::Accumulate(Telemetry::FX_REFRESH_DRIVER_CONTENT_FRAME_DELAY_MS,
sample);
Telemetry::Accumulate(
Telemetry::FX_REFRESH_DRIVER_SYNC_SCROLL_FRAME_DELAY_MS, sample);
} else {
// Request the vsync rate which VsyncChild stored the last time it got a
// vsync notification.
mVsyncRate = mVsyncChild->GetVsyncRate();
}
#endif
}
void OnTimerStart() {
mLastTickStart = TimeStamp::Now();
mLastTickEnd = TimeStamp();
mLastIdleTaskCount = 0;
}
void IdlePriorityNotify() {
if (mLastProcessedTick.IsNull() || mRecentVsync > mLastProcessedTick) {
// mSuspendVsyncPriorityTicksUntil is for high priority vsync
// notifications only.
mSuspendVsyncPriorityTicksUntil = TimeStamp();
TickRefreshDriver(mRecentVsyncId, mRecentVsync);
}
mProcessedVsync = true;
}
void TickRefreshDriver(VsyncId aId, TimeStamp aVsyncTimestamp) {
MOZ_ASSERT(NS_IsMainThread());
RecordTelemetryProbes(aVsyncTimestamp);
TimeStamp tickStart = TimeStamp::Now();
TimeDuration rate = GetTimerRate();
if (TimeDuration::FromMilliseconds(nsRefreshDriver::DefaultInterval() / 2) >
rate) {
sMostRecentHighRateVsync = tickStart;
}
// On 32-bit Windows we sometimes get times where TimeStamp::Now() is not
// monotonic because the underlying system apis produce non-monontonic
// results. (bug 1306896)
#if !defined(_WIN32)
MOZ_ASSERT(aVsyncTimestamp <= tickStart);
#endif
bool shouldGiveNonVSyncTasksMoreTime = ShouldGiveNonVsyncTasksMoreTime();
// Set these variables before calling RunRefreshDrivers so that they are
// visible to any nested ticks.
mLastTickStart = tickStart;
mLastProcessedTick = aVsyncTimestamp;
RunRefreshDrivers(aId, aVsyncTimestamp);
TimeStamp tickEnd = TimeStamp::Now();
// Re-read mLastTickStart in case there was a nested tick inside this
// tick.
TimeStamp mostRecentTickStart = mLastTickStart;
// Let also non-RefreshDriver code to run at least for awhile if we have
// a mVsyncRefreshDriverTimer.
// Always give a tiny bit, 1% of the vsync interval, time outside the
// tick
// In case there are both normal tasks and RefreshDrivers are doing
// work, mSuspendVsyncPriorityTicksUntil will be set to a timestamp in the
// future where the period between the previous tick start
// (aVsyncTimestamp) and the next tick needs to be at least the amount of
// work normal tasks and RefreshDrivers did together (minus short grace
// period).
TimeDuration gracePeriod = rate / int64_t(100);
if (shouldGiveNonVSyncTasksMoreTime) {
if (!mLastTickEnd.IsNull() && XRE_IsContentProcess() &&
// For RefreshDriver scheduling during page load there is currently
// idle priority based setup.
// XXX Consider to remove the page load specific code paths.
!IsAnyToplevelContentPageLoading()) {
// In case normal tasks are doing lots of work, we still want to paint
// every now and then, so only at maximum 4 * rate of work is counted
// here.
// If we're giving extra time for tasks outside a tick, try to
// ensure the next vsync after that period is handled, so subtract
// a grace period.
TimeDuration timeForOutsideTick = clamped(
tickStart - mLastTickEnd - gracePeriod, TimeDuration(), rate * 4);
mSuspendVsyncPriorityTicksUntil = aVsyncTimestamp + timeForOutsideTick +
(tickEnd - mostRecentTickStart);
} else {
mSuspendVsyncPriorityTicksUntil =
aVsyncTimestamp + gracePeriod + (tickEnd - mostRecentTickStart);
}
} else {
mSuspendVsyncPriorityTicksUntil = aVsyncTimestamp + gracePeriod;
}
mLastIdleTaskCount =
TaskController::Get()->GetIdleTaskManager()->ProcessedTaskCount();
mLastRunOutOfMTTasksCount = TaskController::Get()->RunOutOfMTTasksCount();
mLastTickEnd = tickEnd;
}
void StartTimer() override {
MOZ_ASSERT(NS_IsMainThread());
mLastFireTime = TimeStamp::Now();
mLastFireId = VsyncId();
if (mVsyncDispatcher) {
mVsyncDispatcher->AddVsyncObserver(mVsyncObserver);
} else if (mVsyncChild) {
mVsyncChild->AddChildRefreshTimer(mVsyncObserver);
OnTimerStart();
}
mIsTicking = true;
}
void StopTimer() override {
MOZ_ASSERT(NS_IsMainThread());
if (mVsyncDispatcher) {
mVsyncDispatcher->RemoveVsyncObserver(mVsyncObserver);
} else if (mVsyncChild) {
mVsyncChild->RemoveChildRefreshTimer(mVsyncObserver);
}
mIsTicking = false;
}
public:
bool IsTicking() const override { return mIsTicking; }
protected:
void ScheduleNextTick(TimeStamp aNowTime) override {
// Do nothing since we just wait for the next vsync from
// RefreshDriverVsyncObserver.
}
void RunRefreshDrivers(VsyncId aId, TimeStamp aTimeStamp) {
Tick(aId, aTimeStamp);
for (auto& driver : mContentRefreshDrivers) {
driver->FinishedVsyncTick();
}
for (auto& driver : mRootRefreshDrivers) {
driver->FinishedVsyncTick();
}
}
// Always non-null. Has a weak pointer to us and notifies us of vsync.
RefPtr<RefreshDriverVsyncObserver> mVsyncObserver;
// Used in the parent process. We register mVsyncObserver with it for the
// duration during which we want to receive vsync notifications. We also
// use it to query the current vsync rate.
RefPtr<VsyncDispatcher> mVsyncDispatcher;
// Used it the content process. We register mVsyncObserver with it for the
// duration during which we want to receive vsync notifications. The
// mVsyncChild will be always available before VsyncChild::ActorDestroy().
// After ActorDestroy(), StartTimer() and StopTimer() calls will be non-op.
RefPtr<VsyncMainChild> mVsyncChild;
TimeDuration mVsyncRate;
bool mIsTicking = false;
TimeStamp mRecentVsync;
VsyncId mRecentVsyncId;
// The local start time when RefreshDrivers' Tick was called last time.
TimeStamp mLastTickStart;
// The local end time of the last RefreshDrivers' tick.
TimeStamp mLastTickEnd;
// The number of idle tasks the main thread has processed. It is updated
// right after RefreshDrivers' tick.
uint64_t mLastIdleTaskCount;
// If there were no idle tasks, we need to check if the main event queue
// was totally empty at times.
uint64_t mLastRunOutOfMTTasksCount;
// Note, mLastProcessedTick stores the vsync timestamp, which may be coming
// from a different process.
TimeStamp mLastProcessedTick;
// mSuspendVsyncPriorityTicksUntil is used to block too high refresh rate in
// case the main thread has also other non-idle tasks to process.
// The timestamp is effectively mLastProcessedTick + some duration.
TimeStamp mSuspendVsyncPriorityTicksUntil;
bool mProcessedVsync;
}; // VsyncRefreshDriverTimer
/**
* Since the content process takes some time to setup
* the vsync IPC connection, this timer is used
* during the intial startup process.
* During initial startup, the refresh drivers
* are ticked off this timer, and are swapped out once content
* vsync IPC connection is established.
*/
class StartupRefreshDriverTimer : public SimpleTimerBasedRefreshDriverTimer {
public:
explicit StartupRefreshDriverTimer(double aRate)
: SimpleTimerBasedRefreshDriverTimer(aRate) {}
protected:
void ScheduleNextTick(TimeStamp aNowTime) override {
// Since this is only used for startup, it isn't super critical
// that we tick at consistent intervals.
TimeStamp newTarget = aNowTime + mRateDuration;
uint32_t delay =
static_cast<uint32_t>((newTarget - aNowTime).ToMilliseconds());
mTimer->InitWithNamedFuncCallback(
TimerTick, this, delay, nsITimer::TYPE_ONE_SHOT,
"StartupRefreshDriverTimer::ScheduleNextTick");
mTargetTime = newTarget;
}
public:
bool IsTicking() const override { return true; }
};
/*
* A RefreshDriverTimer for inactive documents. When a new refresh driver is
* added, the rate is reset to the base (normally 1s/1fps). Every time
* it ticks, a single refresh driver is poked. Once they have all been poked,
* the duration between ticks doubles, up to mDisableAfterMilliseconds. At that
* point, the timer is quiet and doesn't tick (until something is added to it
* again).
*
* When a timer is removed, there is a possibility of another timer
* being skipped for one cycle. We could avoid this by adjusting
* mNextDriverIndex in RemoveRefreshDriver, but there's little need to
* add that complexity. All we want is for inactive drivers to tick
* at some point, but we don't care too much about how often.
*/
class InactiveRefreshDriverTimer final
: public SimpleTimerBasedRefreshDriverTimer {
public:
explicit InactiveRefreshDriverTimer(double aRate)
: SimpleTimerBasedRefreshDriverTimer(aRate),
mNextTickDuration(aRate),
mDisableAfterMilliseconds(-1.0),
mNextDriverIndex(0) {}
InactiveRefreshDriverTimer(double aRate, double aDisableAfterMilliseconds)
: SimpleTimerBasedRefreshDriverTimer(aRate),
mNextTickDuration(aRate),
mDisableAfterMilliseconds(aDisableAfterMilliseconds),
mNextDriverIndex(0) {}
void AddRefreshDriver(nsRefreshDriver* aDriver) override {
RefreshDriverTimer::AddRefreshDriver(aDriver);
LOG("[%p] inactive timer got new refresh driver %p, resetting rate", this,
aDriver);
// reset the timer, and start with the newly added one next time.
mNextTickDuration = mRateMilliseconds;
// we don't really have to start with the newly added one, but we may as
// well not tick the old ones at the fastest rate any more than we need to.
mNextDriverIndex = GetRefreshDriverCount() - 1;
StopTimer();
StartTimer();
}
TimeDuration GetTimerRate() override {
return TimeDuration::FromMilliseconds(mNextTickDuration);
}
protected:
uint32_t GetRefreshDriverCount() {
return mContentRefreshDrivers.Length() + mRootRefreshDrivers.Length();
}
void StartTimer() override {
mLastFireTime = TimeStamp::Now();
mLastFireId = VsyncId();
mTargetTime = mLastFireTime + mRateDuration;
uint32_t delay = static_cast<uint32_t>(mRateMilliseconds);
mTimer->InitWithNamedFuncCallback(TimerTickOne, this, delay,
nsITimer::TYPE_ONE_SHOT,
"InactiveRefreshDriverTimer::StartTimer");
mIsTicking = true;
}
void StopTimer() override {
mTimer->Cancel();
mIsTicking = false;
}
void ScheduleNextTick(TimeStamp aNowTime) override {
if (mDisableAfterMilliseconds > 0.0 &&
mNextTickDuration > mDisableAfterMilliseconds) {
// We hit the time after which we should disable
// inactive window refreshes; don't schedule anything
// until we get kicked by an AddRefreshDriver call.
return;
}
// double the next tick time if we've already gone through all of them once
if (mNextDriverIndex >= GetRefreshDriverCount()) {
mNextTickDuration *= 2.0;
mNextDriverIndex = 0;
}
// this doesn't need to be precise; do a simple schedule
uint32_t delay = static_cast<uint32_t>(mNextTickDuration);
mTimer->InitWithNamedFuncCallback(
TimerTickOne, this, delay, nsITimer::TYPE_ONE_SHOT,
"InactiveRefreshDriverTimer::ScheduleNextTick");
LOG("[%p] inactive timer next tick in %f ms [index %d/%d]", this,
mNextTickDuration, mNextDriverIndex, GetRefreshDriverCount());
}
public:
bool IsTicking() const override { return mIsTicking; }
protected:
/* Runs just one driver's tick. */
void TickOne() {
TimeStamp now = TimeStamp::Now();
ScheduleNextTick(now);
mLastFireTime = now;
mLastFireId = VsyncId();
nsTArray<RefPtr<nsRefreshDriver>> drivers(mContentRefreshDrivers.Clone());
drivers.AppendElements(mRootRefreshDrivers);
size_t index = mNextDriverIndex;
if (index < drivers.Length() &&
!drivers[index]->IsTestControllingRefreshesEnabled()) {
TickDriver(drivers[index], VsyncId(), now);
}
mNextDriverIndex++;
}
static void TimerTickOne(nsITimer* aTimer, void* aClosure) {
RefPtr<InactiveRefreshDriverTimer> timer =
static_cast<InactiveRefreshDriverTimer*>(aClosure);
timer->TickOne();
}
double mNextTickDuration;
double mDisableAfterMilliseconds;
uint32_t mNextDriverIndex;
bool mIsTicking = false;
};
} // namespace mozilla
static StaticRefPtr<RefreshDriverTimer> sRegularRateTimer;
static StaticAutoPtr<nsTArray<RefreshDriverTimer*>> sRegularRateTimerList;
static StaticRefPtr<InactiveRefreshDriverTimer> sThrottledRateTimer;
void nsRefreshDriver::CreateVsyncRefreshTimer() {
MOZ_ASSERT(NS_IsMainThread());
if (gfxPlatform::IsInLayoutAsapMode()) {
return;
}
if (!mOwnTimer) {
// If available, we fetch the widget-specific vsync source.
nsPresContext* pc = GetPresContext();
nsCOMPtr<nsIWidget> widget = pc->GetRootWidget();
if (widget) {
if (RefPtr<VsyncDispatcher> vsyncDispatcher =
widget->GetVsyncDispatcher()) {
mOwnTimer = VsyncRefreshDriverTimer::
CreateForParentProcessWithLocalVsyncDispatcher(
std::move(vsyncDispatcher));
sRegularRateTimerList->AppendElement(mOwnTimer.get());
return;
}
if (BrowserChild* browserChild = widget->GetOwningBrowserChild()) {
if (RefPtr<VsyncMainChild> vsyncChildViaPBrowser =
browserChild->GetVsyncChild()) {
mOwnTimer = VsyncRefreshDriverTimer::CreateForContentProcess(
std::move(vsyncChildViaPBrowser));
sRegularRateTimerList->AppendElement(mOwnTimer.get());
return;
}
}
}
}
if (!sRegularRateTimer) {
if (XRE_IsParentProcess()) {
// Make sure all vsync systems are ready.
gfxPlatform::GetPlatform();
// In parent process, we can create the VsyncRefreshDriverTimer directly.
sRegularRateTimer =
VsyncRefreshDriverTimer::CreateForParentProcessWithGlobalVsync();
} else {
PBackgroundChild* actorChild =
BackgroundChild::GetOrCreateForCurrentThread();
if (NS_WARN_IF(!actorChild)) {
return;
}
auto vsyncChildViaPBackground = MakeRefPtr<dom::VsyncMainChild>();
dom::PVsyncChild* actor =
actorChild->SendPVsyncConstructor(vsyncChildViaPBackground);
if (NS_WARN_IF(!actor)) {
return;
}
RefPtr<RefreshDriverTimer> vsyncRefreshDriverTimer =
VsyncRefreshDriverTimer::CreateForContentProcess(
std::move(vsyncChildViaPBackground));
sRegularRateTimer = std::move(vsyncRefreshDriverTimer);
}
}
}
static uint32_t GetFirstFrameDelay(imgIRequest* req) {
nsCOMPtr<imgIContainer> container;
if (NS_FAILED(req->GetImage(getter_AddRefs(container))) || !container) {
return 0;
}
// If this image isn't animated, there isn't a first frame delay.
int32_t delay = container->GetFirstFrameDelay();
if (delay < 0) return 0;
return static_cast<uint32_t>(delay);
}
/* static */
void nsRefreshDriver::Shutdown() {
MOZ_ASSERT(NS_IsMainThread());
// clean up our timers
sRegularRateTimer = nullptr;
sRegularRateTimerList = nullptr;
sThrottledRateTimer = nullptr;
}
/* static */
int32_t nsRefreshDriver::DefaultInterval() {
return NSToIntRound(1000.0 / gfxPlatform::GetDefaultFrameRate());
}
/* static */
bool nsRefreshDriver::IsInHighRateMode() {
// We're in high rate mode if we've gotten a fast rate during the last
// DefaultInterval().
bool inHighRateMode =
!gfxPlatform::IsInLayoutAsapMode() &&
StaticPrefs::layout_expose_high_rate_mode_from_refreshdriver() &&
!sMostRecentHighRateVsync.IsNull() &&
(sMostRecentHighRateVsync +
TimeDuration::FromMilliseconds(DefaultInterval())) > TimeStamp::Now();
if (!inHighRateMode) {
// Clear the timestamp so that the next call is faster.
sMostRecentHighRateVsync = TimeStamp();
}
return inHighRateMode;
}
// Compute the interval to use for the refresh driver timer, in milliseconds.
// outIsDefault indicates that rate was not explicitly set by the user
// so we might choose other, more appropriate rates (e.g. vsync, etc)
// layout.frame_rate=0 indicates "ASAP mode".
// In ASAP mode rendering is iterated as fast as possible (typically for stress
// testing). A target rate of 10k is used internally instead of special-handling
// 0. Backends which block on swap/present/etc should try to not block when
// layout.frame_rate=0 - to comply with "ASAP" as much as possible.
double nsRefreshDriver::GetRegularTimerInterval() const {
int32_t rate = Preferences::GetInt("layout.frame_rate", -1);
if (rate < 0) {
rate = gfxPlatform::GetDefaultFrameRate();
} else if (rate == 0) {
rate = 10000;
}
return 1000.0 / rate;
}
/* static */
double nsRefreshDriver::GetThrottledTimerInterval() {
uint32_t rate = StaticPrefs::layout_throttled_frame_rate();
return 1000.0 / rate;
}
/* static */
TimeDuration nsRefreshDriver::GetMinRecomputeVisibilityInterval() {
return TimeDuration::FromMilliseconds(
StaticPrefs::layout_visibility_min_recompute_interval_ms());
}
bool nsRefreshDriver::ComputeShouldBeThrottled() const {
if (mIsActive) {
// If we're active we should definitely be unthrottled.
return false;
}
if (!mIsInActiveTab) {
// If we're not in the active tab we should definitely be throttled.
return true;
}
if (mIsGrantingActivityGracePeriod) {
// If we're granting the activity grace period, then we should be
// unthrottled.
return false;
}
// Otherwise we should be throttled.
return true;
}
RefreshDriverTimer* nsRefreshDriver::ChooseTimer() {
if (mThrottled) {
if (!sThrottledRateTimer) {
sThrottledRateTimer = new InactiveRefreshDriverTimer(
GetThrottledTimerInterval(),
DEFAULT_INACTIVE_TIMER_DISABLE_SECONDS * 1000.0);
}
return sThrottledRateTimer;
}
if (!mOwnTimer) {
CreateVsyncRefreshTimer();
}
if (mOwnTimer) {
return mOwnTimer.get();
}
if (!sRegularRateTimer) {
double rate = GetRegularTimerInterval();
sRegularRateTimer = new StartupRefreshDriverTimer(rate);
}
return sRegularRateTimer;
}
static nsDocShell* GetDocShell(nsPresContext* aPresContext) {
if (!aPresContext) {
return nullptr;
}
return static_cast<nsDocShell*>(aPresContext->GetDocShell());
}
nsRefreshDriver::nsRefreshDriver(nsPresContext* aPresContext)
: mActiveTimer(nullptr),
mOwnTimer(nullptr),
mPresContext(aPresContext),
mRootRefresh(nullptr),
mNextTransactionId{0},
mFreezeCount(0),
mThrottledFrameRequestInterval(
TimeDuration::FromMilliseconds(GetThrottledTimerInterval())),
mMinRecomputeVisibilityInterval(GetMinRecomputeVisibilityInterval()),
mThrottled(false),
mIsActive(true),
mIsInActiveTab(true),
mIsGrantingActivityGracePeriod(false),
mHasGrantedActivityGracePeriod(false),
mNeedToRecomputeVisibility(false),
mTestControllingRefreshes(false),
mViewManagerFlushIsPending(false),
mHasScheduleFlush(false),
mInRefresh(false),
mWaitingForTransaction(false),
mSkippedPaints(false),
mResizeSuppressed(false),
mNotifyDOMContentFlushed(false),
mNeedToUpdateIntersectionObservations(false),
mInNormalTick(false),
mAttemptedExtraTickSinceLastVsync(false),
mHasExceededAfterLoadTickPeriod(false),
mHasStartedTimerAtLeastOnce(false) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mPresContext,
"Need a pres context to tell us to call Disconnect() later "
"and decrement sRefreshDriverCount.");
mMostRecentRefresh = TimeStamp::Now();
mNextThrottledFrameRequestTick = mMostRecentRefresh;
mNextRecomputeVisibilityTick = mMostRecentRefresh;
if (!sRegularRateTimerList) {
sRegularRateTimerList = new nsTArray<RefreshDriverTimer*>();
}
++sRefreshDriverCount;
}
nsRefreshDriver::~nsRefreshDriver() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(ObserverCount() == mEarlyRunners.Length(),
"observers, except pending selection scrolls, "
"should have been unregistered");
MOZ_ASSERT(!mActiveTimer, "timer should be gone");
MOZ_ASSERT(!mPresContext,
"Should have called Disconnect() and decremented "
"sRefreshDriverCount!");
if (mRootRefresh) {
mRootRefresh->RemoveRefreshObserver(this, FlushType::Style);
mRootRefresh = nullptr;
}
if (mOwnTimer && sRegularRateTimerList) {
sRegularRateTimerList->RemoveElement(mOwnTimer.get());
}
}
// Method for testing. See nsIDOMWindowUtils.advanceTimeAndRefresh
// for description.
void nsRefreshDriver::AdvanceTimeAndRefresh(int64_t aMilliseconds) {
// ensure that we're removed from our driver
StopTimer();
if (!mTestControllingRefreshes) {
mMostRecentRefresh = TimeStamp::Now();
mTestControllingRefreshes = true;
if (mWaitingForTransaction) {
// Disable any refresh driver throttling when entering test mode
mWaitingForTransaction = false;
mSkippedPaints = false;
}
}
mMostRecentRefresh += TimeDuration::FromMilliseconds((double)aMilliseconds);
mozilla::dom::AutoNoJSAPI nojsapi;
DoTick();
}
void nsRefreshDriver::RestoreNormalRefresh() {
mTestControllingRefreshes = false;
EnsureTimerStarted(eAllowTimeToGoBackwards);
mPendingTransactions.Clear();
}
TimeStamp nsRefreshDriver::MostRecentRefresh(bool aEnsureTimerStarted) const {
// In case of stylo traversal, we have already activated the refresh driver in
// RestyleManager::ProcessPendingRestyles().
if (aEnsureTimerStarted && !ServoStyleSet::IsInServoTraversal()) {
const_cast<nsRefreshDriver*>(this)->EnsureTimerStarted();
}
return mMostRecentRefresh;
}
void nsRefreshDriver::AddRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType,
const char* aObserverDescription) {
ObserverArray& array = ArrayFor(aFlushType);
array.AppendElement(
ObserverData{aObserver, aObserverDescription, TimeStamp::Now(),
MarkerInnerWindowIdFromDocShell(GetDocShell(mPresContext)),
profiler_capture_backtrace(), aFlushType});
EnsureTimerStarted();
}
bool nsRefreshDriver::RemoveRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType) {
ObserverArray& array = ArrayFor(aFlushType);
auto index = array.IndexOf(aObserver);
if (index == ObserverArray::array_type::NoIndex) {
return false;
}
if (profiler_thread_is_being_profiled_for_markers()) {
auto& data = array.ElementAt(index);
nsPrintfCString str("%s [%s]", data.mDescription,
kFlushTypeNames[aFlushType]);
PROFILER_MARKER_TEXT(
"RefreshObserver", GRAPHICS,
MarkerOptions(MarkerStack::TakeBacktrace(std::move(data.mCause)),
MarkerTiming::IntervalUntilNowFrom(data.mRegisterTime),
std::move(data.mInnerWindowId)),
str);
}
array.RemoveElementAt(index);
return true;
}
void nsRefreshDriver::AddTimerAdjustmentObserver(
nsATimerAdjustmentObserver* aObserver) {
MOZ_ASSERT(!mTimerAdjustmentObservers.Contains(aObserver));
mTimerAdjustmentObservers.AppendElement(aObserver);
}
void nsRefreshDriver::RemoveTimerAdjustmentObserver(
nsATimerAdjustmentObserver* aObserver) {
MOZ_ASSERT(mTimerAdjustmentObservers.Contains(aObserver));
mTimerAdjustmentObservers.RemoveElement(aObserver);
}
void nsRefreshDriver::PostVisualViewportResizeEvent(
VVPResizeEvent* aResizeEvent) {
mVisualViewportResizeEvents.AppendElement(aResizeEvent);
EnsureTimerStarted();
}
void nsRefreshDriver::DispatchVisualViewportResizeEvents() {
// We're taking a hint from scroll events and only dispatch the current set
// of queued resize events. If additional events are posted in response to
// the current events being dispatched, we'll dispatch them on the next tick.
VisualViewportResizeEventArray events =
std::move(mVisualViewportResizeEvents);
for (auto& event : events) {
event->Run();
}
}
void nsRefreshDriver::PostScrollEvent(mozilla::Runnable* aScrollEvent,
bool aDelayed) {
if (aDelayed) {
mDelayedScrollEvents.AppendElement(aScrollEvent);
} else {
mScrollEvents.AppendElement(aScrollEvent);
EnsureTimerStarted();
}
}
void nsRefreshDriver::DispatchScrollEvents() {
// Scroll events are one-shot, so after running them we can drop them.
// However, dispatching a scroll event can potentially cause more scroll
// events to be posted, so we move the initial set into a temporary array
// first. (Newly posted scroll events will be dispatched on the next tick.)
ScrollEventArray events = std::move(mScrollEvents);
for (auto& event : events) {
event->Run();
}
}
void nsRefreshDriver::PostVisualViewportScrollEvent(
VVPScrollEvent* aScrollEvent) {
mVisualViewportScrollEvents.AppendElement(aScrollEvent);
EnsureTimerStarted();
}
void nsRefreshDriver::DispatchVisualViewportScrollEvents() {
// Scroll events are one-shot, so after running them we can drop them.
// However, dispatching a scroll event can potentially cause more scroll
// events to be posted, so we move the initial set into a temporary array
// first. (Newly posted scroll events will be dispatched on the next tick.)
VisualViewportScrollEventArray events =
std::move(mVisualViewportScrollEvents);
for (auto& event : events) {
event->Run();
}
}
void nsRefreshDriver::AddPostRefreshObserver(
nsAPostRefreshObserver* aObserver) {
MOZ_DIAGNOSTIC_ASSERT(!mPostRefreshObservers.Contains(aObserver));
mPostRefreshObservers.AppendElement(aObserver);
}
void nsRefreshDriver::RemovePostRefreshObserver(
nsAPostRefreshObserver* aObserver) {
bool removed = mPostRefreshObservers.RemoveElement(aObserver);
MOZ_DIAGNOSTIC_ASSERT(removed);
Unused << removed;
}
void nsRefreshDriver::AddImageRequest(imgIRequest* aRequest) {
uint32_t delay = GetFirstFrameDelay(aRequest);
if (delay == 0) {
mRequests.Insert(aRequest);
} else {
auto* const start = mStartTable.GetOrInsertNew(delay);
start->mEntries.Insert(aRequest);
}
EnsureTimerStarted();
if (profiler_thread_is_being_profiled_for_markers()) {
nsCOMPtr<nsIURI> uri;
aRequest->GetURI(getter_AddRefs(uri));
nsAutoCString uristr;
uri->GetAsciiSpec(uristr);
PROFILER_MARKER_TEXT("Image Animation", GRAPHICS,
MarkerOptions(MarkerTiming::IntervalStart(),
MarkerInnerWindowIdFromDocShell(
GetDocShell(mPresContext))),
uristr);
}
}
void nsRefreshDriver::RemoveImageRequest(imgIRequest* aRequest) {
// Try to remove from both places, just in case.
bool removed = mRequests.EnsureRemoved(aRequest);
uint32_t delay = GetFirstFrameDelay(aRequest);
if (delay != 0) {
ImageStartData* start = mStartTable.Get(delay);
if (start) {
removed = removed | start->mEntries.EnsureRemoved(aRequest);
}
}
if (removed && profiler_thread_is_being_profiled_for_markers()) {
nsCOMPtr<nsIURI> uri;
aRequest->GetURI(getter_AddRefs(uri));
nsAutoCString uristr;
uri->GetAsciiSpec(uristr);
PROFILER_MARKER_TEXT("Image Animation", GRAPHICS,
MarkerOptions(MarkerTiming::IntervalEnd(),
MarkerInnerWindowIdFromDocShell(
GetDocShell(mPresContext))),
uristr);
}
}
void nsRefreshDriver::NotifyDOMContentLoaded() {
// If the refresh driver is going to tick, we mark the timestamp after
// everything is flushed in the next tick. If it isn't, mark ourselves as
// flushed now.
if (!HasObservers()) {
if (nsPresContext* pc = GetPresContext()) {
pc->NotifyDOMContentFlushed();
}
// else, we don't have a nsPresContext, so our doc is probably being
// destroyed and this notification doesn't need sending anyway.
} else {
mNotifyDOMContentFlushed = true;
}
}
void nsRefreshDriver::RegisterCompositionPayload(
const mozilla::layers::CompositionPayload& aPayload) {
mCompositionPayloads.AppendElement(aPayload);
}
void nsRefreshDriver::AddForceNotifyContentfulPaintPresContext(
nsPresContext* aPresContext) {
mForceNotifyContentfulPaintPresContexts.AppendElement(aPresContext);
}
void nsRefreshDriver::FlushForceNotifyContentfulPaintPresContext() {
while (!mForceNotifyContentfulPaintPresContexts.IsEmpty()) {
WeakPtr<nsPresContext> presContext =
mForceNotifyContentfulPaintPresContexts.PopLastElement();
if (presContext) {
presContext->NotifyContentfulPaint();
}
}
}
void nsRefreshDriver::RunDelayedEventsSoon() {
// Place entries for delayed events into their corresponding normal list,
// and schedule a refresh. When these delayed events run, if their document
// still has events suppressed then they will be readded to the delayed
// events list.
mScrollEvents.AppendElements(mDelayedScrollEvents);
mDelayedScrollEvents.Clear();
mResizeEventFlushObservers.AppendElements(mDelayedResizeEventFlushObservers);
mDelayedResizeEventFlushObservers.Clear();
EnsureTimerStarted();
}
bool nsRefreshDriver::CanDoCatchUpTick() {
if (mTestControllingRefreshes || !mActiveTimer) {
return false;
}
// If we've already ticked for the current timer refresh (or more recently
// than that), then we don't need to do any catching up.
if (mMostRecentRefresh >= mActiveTimer->MostRecentRefresh()) {
return false;
}
if (mTickVsyncTime.IsNull()) {
// Don't try to run a catch-up tick before there has been at least one
// normal tick. The catch-up tick could negatively affect page load
// performance.
return false;
}
if (mPresContext && mPresContext->Document()->GetReadyStateEnum() <
Document::READYSTATE_COMPLETE) {
// Don't try to run a catch-up tick before the page has finished loading.
// The catch-up tick could negatively affect page load performance.
return false;
}
return true;
}
bool nsRefreshDriver::CanDoExtraTick() {
// Only allow one extra tick per normal vsync tick.
if (mAttemptedExtraTickSinceLastVsync) {
return false;
}
// If we don't have a timer, or we didn't tick on the timer's
// refresh then we can't do an 'extra' tick (but we may still
// do a catch up tick).
if (!mActiveTimer ||
mActiveTimer->MostRecentRefresh() != mMostRecentRefresh) {
return false;
}
// Grab the current timestamp before checking the tick hint to be sure
// sure that it's equal or smaller than the value used within checking
// the tick hint.
TimeStamp now = TimeStamp::Now();
Maybe<TimeStamp> nextTick = mActiveTimer->GetNextTickHint();
int32_t minimumRequiredTime = StaticPrefs::layout_extra_tick_minimum_ms();
// If there's less than 4 milliseconds until the next tick, it's probably
// not worth trying to catch up.
if (minimumRequiredTime < 0 || !nextTick ||
(*nextTick - now) < TimeDuration::FromMilliseconds(minimumRequiredTime)) {
return false;
}
return true;
}
void nsRefreshDriver::EnsureTimerStarted(EnsureTimerStartedFlags aFlags) {
// FIXME: Bug 1346065: We should also assert the case where we have
// STYLO_THREADS=1.
MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal() || NS_IsMainThread(),
"EnsureTimerStarted should be called only when we are not "
"in servo traversal or on the main-thread");
if (mTestControllingRefreshes) return;
if (!mRefreshTimerStartedCause) {
mRefreshTimerStartedCause = profiler_capture_backtrace();
}
// will it already fire, and no other changes needed?
if (mActiveTimer && !(aFlags & eForceAdjustTimer)) {
// If we're being called from within a user input handler, and we think
// there's time to rush an extra tick immediately, then schedule a runnable
// to run the extra tick.
if (mUserInputProcessingCount && CanDoExtraTick()) {
RefPtr<nsRefreshDriver> self = this;
NS_DispatchToCurrentThreadQueue(
NS_NewRunnableFunction(
"RefreshDriver::EnsureTimerStarted::extra",
[self]() -> void {
// Re-check if we can still do an extra tick, in case anything
// changed while the runnable was pending.
if (self->CanDoExtraTick()) {
PROFILER_MARKER_UNTYPED("ExtraRefreshDriverTick", GRAPHICS);
LOG("[%p] Doing extra tick for user input", self.get());
self->mAttemptedExtraTickSinceLastVsync = true;
self->Tick(self->mActiveTimer->MostRecentRefreshVsyncId(),
self->mActiveTimer->MostRecentRefresh(),
IsExtraTick::Yes);
}
}),
EventQueuePriority::Vsync);
}
return;
}
if (IsFrozen() || !mPresContext) {
// If we don't want to start it now, or we've been disconnected.
StopTimer();
return;
}
if (mPresContext->Document()->IsBeingUsedAsImage()) {
// Image documents receive ticks from clients' refresh drivers.
// XXXdholbert Exclude SVG-in-opentype fonts from this optimization, until
// they receive refresh-driver ticks from their client docs (bug 1107252).
nsIURI* uri = mPresContext->Document()->GetDocumentURI();
if (!uri || !mozilla::dom::IsFontTableURI(uri)) {
MOZ_ASSERT(!mActiveTimer,
"image doc refresh driver should never have its own timer");
return;