gecko-dev/dom/animation/DocumentTimeline.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DocumentTimeline.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/dom/DocumentTimelineBinding.h"
#include "AnimationUtils.h"
#include "nsContentUtils.h"
#include "nsDOMMutationObserver.h"
#include "nsDOMNavigationTiming.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsRefreshDriver.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_CLASS(DocumentTimeline)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DocumentTimeline,
AnimationTimeline)
tmp->UnregisterFromRefreshDriver();
if (tmp->isInList()) {
tmp->remove();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DocumentTimeline,
AnimationTimeline)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(DocumentTimeline,
AnimationTimeline)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DocumentTimeline)
NS_INTERFACE_MAP_END_INHERITING(AnimationTimeline)
NS_IMPL_ADDREF_INHERITED(DocumentTimeline, AnimationTimeline)
NS_IMPL_RELEASE_INHERITED(DocumentTimeline, AnimationTimeline)
JSObject* DocumentTimeline::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return DocumentTimeline_Binding::Wrap(aCx, this, aGivenProto);
}
/* static */
already_AddRefed<DocumentTimeline> DocumentTimeline::Constructor(
const GlobalObject& aGlobal, const DocumentTimelineOptions& aOptions,
ErrorResult& aRv) {
Document* doc = AnimationUtils::GetCurrentRealmDocument(aGlobal.Context());
if (!doc) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
TimeDuration originTime =
TimeDuration::FromMilliseconds(aOptions.mOriginTime);
if (originTime == TimeDuration::Forever() ||
originTime == -TimeDuration::Forever()) {
aRv.ThrowTypeError<dom::MSG_TIME_VALUE_OUT_OF_RANGE>(
NS_LITERAL_STRING("Origin time"));
return nullptr;
}
RefPtr<DocumentTimeline> timeline = new DocumentTimeline(doc, originTime);
return timeline.forget();
}
Nullable<TimeDuration> DocumentTimeline::GetCurrentTimeAsDuration() const {
return ToTimelineTime(GetCurrentTimeStamp());
}
TimeStamp DocumentTimeline::GetCurrentTimeStamp() const {
nsRefreshDriver* refreshDriver = GetRefreshDriver();
TimeStamp refreshTime =
refreshDriver ? refreshDriver->MostRecentRefresh() : TimeStamp();
// Always return the same object to benefit from return-value optimization.
TimeStamp result =
!refreshTime.IsNull() ? refreshTime : mLastRefreshDriverTime;
nsDOMNavigationTiming* timing = mDocument->GetNavigationTiming();
// If we don't have a refresh driver and we've never had one use the
// timeline's zero time.
// In addition, it's possible that our refresh driver's timestamp is behind
// from the navigation start time because the refresh driver timestamp is
// sent through an IPC call whereas the navigation time is set by calling
// TimeStamp::Now() directly. In such cases we also use the timeline's zero
// time.
if (timing &&
(result.IsNull() || result < timing->GetNavigationStartTimeStamp())) {
result = timing->GetNavigationStartTimeStamp();
// Also, let this time represent the current refresh time. This way
// we'll save it as the last refresh time and skip looking up
// navigation start time each time.
refreshTime = result;
}
if (!refreshTime.IsNull()) {
mLastRefreshDriverTime = refreshTime;
}
return result;
}
Nullable<TimeDuration> DocumentTimeline::ToTimelineTime(
const TimeStamp& aTimeStamp) const {
Nullable<TimeDuration> result; // Initializes to null
if (aTimeStamp.IsNull()) {
return result;
}
nsDOMNavigationTiming* timing = mDocument->GetNavigationTiming();
if (MOZ_UNLIKELY(!timing)) {
return result;
}
result.SetValue(aTimeStamp - timing->GetNavigationStartTimeStamp() -
mOriginTime);
return result;
}
void DocumentTimeline::NotifyAnimationUpdated(Animation& aAnimation) {
AnimationTimeline::NotifyAnimationUpdated(aAnimation);
if (!mIsObservingRefreshDriver) {
nsRefreshDriver* refreshDriver = GetRefreshDriver();
if (refreshDriver) {
MOZ_ASSERT(isInList(),
"We should not register with the refresh driver if we are not"
" in the document's list of timelines");
ObserveRefreshDriver(refreshDriver);
}
}
}
void DocumentTimeline::MostRecentRefreshTimeUpdated() {
MOZ_ASSERT(mIsObservingRefreshDriver);
MOZ_ASSERT(GetRefreshDriver(),
"Should be able to reach refresh driver from within WillRefresh");
bool needsTicks = false;
nsTArray<Animation*> animationsToRemove(mAnimations.Count());
nsAutoAnimationMutationBatch mb(mDocument);
for (Animation* animation = mAnimationOrder.getFirst(); animation;
animation =
static_cast<LinkedListElement<Animation>*>(animation)->getNext()) {
// Skip any animations that are longer need associated with this timeline.
if (animation->GetTimeline() != this) {
// If animation has some other timeline, it better not be also in the
// animation list of this timeline object!
MOZ_ASSERT(!animation->GetTimeline());
animationsToRemove.AppendElement(animation);
continue;
}
needsTicks |= animation->NeedsTicks();
// Even if |animation| doesn't need future ticks, we should still
// Tick it this time around since it might just need a one-off tick in
// order to dispatch events.
animation->Tick();
if (!animation->NeedsTicks()) {
animationsToRemove.AppendElement(animation);
}
}
for (Animation* animation : animationsToRemove) {
RemoveAnimation(animation);
}
if (!needsTicks) {
// We already assert that GetRefreshDriver() is non-null at the beginning
// of this function but we check it again here to be sure that ticking
// animations does not have any side effects that cause us to lose the
// connection with the refresh driver, such as triggering the destruction
// of mDocument's PresShell.
MOZ_ASSERT(GetRefreshDriver(),
"Refresh driver should still be valid at end of WillRefresh");
UnregisterFromRefreshDriver();
}
}
void DocumentTimeline::WillRefresh(mozilla::TimeStamp aTime) {
// https://drafts.csswg.org/web-animations-1/#update-animations-and-send-events,
// step2.
// Note that this should be done before nsAutoAnimationMutationBatch which is
// inside MostRecentRefreshTimeUpdated(). If PerformMicroTaskCheckpoint was
// called before nsAutoAnimationMutationBatch is destroyed, some mutation
// records might not be delivered in this checkpoint.
nsAutoMicroTask mt;
MostRecentRefreshTimeUpdated();
}
void DocumentTimeline::NotifyTimerAdjusted(TimeStamp aTime) {
MostRecentRefreshTimeUpdated();
}
void DocumentTimeline::ObserveRefreshDriver(nsRefreshDriver* aDriver) {
MOZ_ASSERT(!mIsObservingRefreshDriver);
// Set the mIsObservingRefreshDriver flag before calling AddRefreshObserver
// since it might end up calling NotifyTimerAdjusted which calls
// MostRecentRefreshTimeUpdated which has an assertion for
// mIsObserveingRefreshDriver check.
mIsObservingRefreshDriver = true;
aDriver->AddRefreshObserver(this, FlushType::Style);
aDriver->AddTimerAdjustmentObserver(this);
}
void DocumentTimeline::NotifyRefreshDriverCreated(nsRefreshDriver* aDriver) {
MOZ_ASSERT(!mIsObservingRefreshDriver,
"Timeline should not be observing the refresh driver before"
" it is created");
if (!mAnimationOrder.isEmpty()) {
MOZ_ASSERT(isInList(),
"We should not register with the refresh driver if we are not"
" in the document's list of timelines");
ObserveRefreshDriver(aDriver);
// Although we have started observing the refresh driver, it's possible we
// could perform a paint before the first refresh driver tick happens. To
// ensure we're in a consistent state in that case we run the first tick
// manually.
MostRecentRefreshTimeUpdated();
}
}
void DocumentTimeline::DisconnectRefreshDriver(nsRefreshDriver* aDriver) {
MOZ_ASSERT(mIsObservingRefreshDriver);
aDriver->RemoveRefreshObserver(this, FlushType::Style);
aDriver->RemoveTimerAdjustmentObserver(this);
mIsObservingRefreshDriver = false;
}
void DocumentTimeline::NotifyRefreshDriverDestroying(nsRefreshDriver* aDriver) {
if (!mIsObservingRefreshDriver) {
return;
}
DisconnectRefreshDriver(aDriver);
}
void DocumentTimeline::RemoveAnimation(Animation* aAnimation) {
AnimationTimeline::RemoveAnimation(aAnimation);
if (mIsObservingRefreshDriver && mAnimations.IsEmpty()) {
UnregisterFromRefreshDriver();
}
}
TimeStamp DocumentTimeline::ToTimeStamp(
const TimeDuration& aTimeDuration) const {
TimeStamp result;
nsDOMNavigationTiming* timing = mDocument->GetNavigationTiming();
if (MOZ_UNLIKELY(!timing)) {
return result;
}
result =
timing->GetNavigationStartTimeStamp() + (aTimeDuration + mOriginTime);
return result;
}
nsRefreshDriver* DocumentTimeline::GetRefreshDriver() const {
nsPresContext* presContext = mDocument->GetPresContext();
if (MOZ_UNLIKELY(!presContext)) {
return nullptr;
}
return presContext->RefreshDriver();
}
void DocumentTimeline::UnregisterFromRefreshDriver() {
if (!mIsObservingRefreshDriver) {
return;
}
nsRefreshDriver* refreshDriver = GetRefreshDriver();
if (!refreshDriver) {
return;
}
DisconnectRefreshDriver(refreshDriver);
}
} // namespace dom
} // namespace mozilla