There is no longer anything in FlushTransitions that modifies the set of
transitions. I believe this changed as of bug 960465, specifically changeset
https://hg.mozilla.org/mozilla-central/rev/b2ee72589c18, so that this code is
no longer needed.
By removing this we can further align FlushAnimations and FlushTransitions.
If the timer is not launched when the content is empty, the first caret
will always has Appearance::NormalNotShown, which is not consistent with
the behavior when the caret is shown when the content is not empty.
After this patch, Gaia will always receive an update event after 3
seconds timeout. Hence fixed a bug that the shortcut text dialog does
not hide after 3 seconds timeout.
This isn't actually needed for the only caller (which ensures that
frames with will-change: opacity create a stacking context), since
nsIFrame::BuildDisplayListForChild checks HasOpacity, which checks for
NS_STYLE_WILL_CHANGE_OPACITY. However, it's good to have the bit set
for consistency in case we use it elsewhere.
This is motivated by three separate but related problems:
1. Our concept of recursion depth is broken for things that run from AfterProcessNextEvent observers (e.g. Promises). We decrement the recursionDepth counter before firing observers, so a Promise callback running at the lowest event loop depth has a recursion depth of 0 (whereas a regular nsIRunnable would be 1). This is a problem because it's impossible to distinguish a Promise running after a sync XHR's onreadystatechange handler from a top-level event (since the former runs with depth 2 - 1 = 1, and the latter runs with just 1).
2. The nsIThreadObserver mechanism that is used by a lot of code to run "after" the current event is a poor fit for anything that runs script. First, the order the observers fire in is the order they were added, not anything fixed by spec. Additionally, running script can cause the event loop to spin, which is a big source of pain here (bholley has some nasty bug caused by this).
3. We run Promises from different points in the code for workers and main thread. The latter runs from XPConnect's nsIThreadObserver callbacks, while the former runs from a hardcoded call to run Promises in the worker event loop. What workers do is particularly problematic because it means we can't get the right recursion depth no matter what we do to nsThread.
The solve this, this patch does the following:
1. Consolidate some handling of microtasks and all handling of stable state from appshell and WorkerPrivate into CycleCollectedJSRuntime.
2. Make the recursionDepth counter only available to CycleCollectedJSRuntime (and its consumers) and remove it from the nsIThreadInternal and nsIThreadObserver APIs.
3. Adjust the recursionDepth counter so that microtasks run with the recursionDepth of the task they are associated with.
4. Introduce the concept of metastable state to replace appshell's RunBeforeNextEvent. Metastable state is reached after every microtask or task is completed. This provides the semantics that bent and I want for IndexedDB, where transactions autocommit at the end of a microtask and do not "spill" from one microtask into a subsequent microtask. This differs from appshell's RunBeforeNextEvent in two ways:
a) It fires between microtasks, which was the motivation for starting this.
b) It no longer ensures that we're at the same event loop depth in the native event queue. bent decided we don't care about this.
5. Reorder stable state to happen after microtasks such as Promises, per HTML. Right now we call the regular thread observers, including appshell, before the main thread observer (XPConnect), so stable state tasks happen before microtasks.
With APZ enabled, these tests activate scrollframes (by scrolling them) in the
test pages but not the reference pages. This causes differences in layerization
which causes reftests to fail by a few pixel differences in the scrollbars. By
making the scrollboxes will-change:scroll-position both the test and reference
pages have activated scrollframes, and so the layerization is the same in both.
This patch updates the logic in nsTransitionManager::FlushTransitions that deals
with detecting newly-started (i.e. when the delay phase has just finished) or
newly-finished animations. The existing logic had the following behavior:
* Calling SetIsFinishedTransition for newly-finished transitions.
This is no longer needed since by this point all consumers of
IsFinishedTransition have been updated to use alternative means for testing
if an animation is relevant.
* Setting transitionStartedOrEnded to true so that we would post an animation
restyle.
We can achieve this same effect by simplying updating the canThrottleTick
flag using the result of calling Animation::CanThrottle on each animation.
Animation::CanThrottle will return false for a newly-started or
newly-finished animation (it returns false for a newly-started animation
since the animation's mIsRunningOnCompositor flag won't yet be true at that
point.)
* Updating the animation generation for newly-started and newly-finished
animations in order to trigger a layer update.
At least that appears to be the intention of this code. However, it currently
has no effect since the animation generation on the pres context is not
incremented in any context I could find where a newly started/finished
animation might be detected.
For this third case, this patch adds tests to ensure that transitions are
correctly added and removed from the compositor when they start and finish.
This is because most of the existing tests in test_animations_omta.html cover
only CSS animations.
As noted in the comments in the test, if a tick lands at the exact beginning of
a transition we will typically not send it to the layer until the following tick
because the RestyleManager will filter out the seemingly redundant change (i.e.
no change to the computed style). Presumably updating the animation generation
was intended to avoid this.
This same behavior is true of CSS animations (and the same kind of comment
appears elsewhere in test_animations_omta.html). Long-term this is probably
worth fixing so that when a transition is triggered we get it to the compositor
one tick earlier which should improve responsiveness when the main thread is
busy and the interval between ticks is long. Furthermore, we should do the same
for both all type of animations, not just transitions.
Currently, however, this patch preserves the existing behavior and helps narrow
the difference between transitions and animations so we can apply this
optimization to both.
This patch generalizes the logic in
nsTransitionManager::PruneCompletedTransitions to consider all transitions that
are no longer current (i.e. not running or scheduled to run) rather than
those marked as finished.
Of particular note, this patch removes the check for finished transitions in
the case when we can't animate the current change. This case occurs when either
we have a non-transition style change that happens to coincide with the current
transition value, or a style change to something we can't interpolate to. In
either case it's not clear why we would cancel the existing transition only if
it is still in motion and not if it is finished. It seems like it should be
cancelled in either case and hence this patch removes this check.
The other change relates to detecting reversing transitions. In this case we do
need to distinguish between transitions that have finished and those that have
not. For this purpose, checking if the animation is current should be
sufficient. (Note that comparing for PlayState() == Finished would not be enough
since we want to also exclude *idle*, i.e. cancelled, animations too.)
In StyleContextChanged, when we drop a transition, we also update the animation
generation, unless the transition is finished. This is so that we will update
animations on layers accordingly. For all intents and purposes this is
equivalent to only updating the animation generation if the animation is
current.
Even in the case where the transition has *just* finished, it will either
already be considered finished and the regular animation tick (which uses the
same refresh driver time as we see in StyleContextChanged) will have triggered
an unthrottled sample to take the animation off the compositor (since
Animation::CanThrottle detects newly finished animations), or it will be not yet
finished in which case HasCurrentEffect will return true. If anything changed
timing properties in the time between running the refresh driver tick and
calling StyleContextChanged (such as seeking the Animation) it will also trigger
a layer update.
This patch also removes an unncessary assertion in
ElementPropertyTransition::CurrentValuePortion. This functions operates
sensibly even for finished transitions (due to the way it manages the fill
mode). It is up to the call site to determine whether it should be calling this
function on a finished transition or not.
AnimationCollection::HasAnimationOfProperty uses IsFinishedTransition to filter
out transitions that should otherwise be ignored. This is used in the following
places:
1. nsLayoutUtils::HasAnimations
The is only used by nsIFrame::BuildDisplayListForStackingContext to see if
there are any opacity animations
For this case, simply returning *current* animations would be sufficient
(since finished but filling animations should have already filled in the
display opacity)
2. CommonAnimationManager::GetAnimationsForCompositor
This should really only return *current* animations--that is, animations that
are running or scheduled to run. Finished animations never run on the
compositor. Indeed, only *playing* animations run on the compositor but, as
we will see in some of the cases below, it is sometimes useful to know that
an animation *will* run on the compositor in the near future (e.g. so we can
pre-render content).
The places where GetAnimationsForCompositor is used are:
- When building layers to add animations to layers in nsDisplayList--in this
case we skip any animations that aren't playing so if
GetAnimationsForCompositor only returned current animations that would be
more than sufficient.
- In nsLayoutUtils::HasAnimationsForCompositor. This in turn is used:
- In ChooseScaleAndSetTransform to see if the transform is being animated
on the compositor. If so, it calls
nsLayoutUtils::ComputeSuitableScaleForAnimation (which also calls
GetAnimationsForCompositor) and passes the result to
GetMinAndMaxScaleForAnimationProperty which we have already adjusted in
part 4 of this patch series to only deal with *relevant* animations
Relevant animations include both current animations and in effect
animations but we don't run forwards-filling animations on the compositor
so GetAnimationsForCompositor should NOT return them. Current animations
should be enough. In fact, playing animations should be enough but we
might want to pre-render layers at a suitable size during their delay
phase so returning current animations is probably ok.
- In nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay to add a fuzz
factor to the overflow rect for frames undergoing a transform animation
on the compositor. In this case too current animations should be
sufficient.
- In nsDisplayOpacity::NeedsActiveLayer to say "yes" if we are animating
opacity on the compositor. Presumably in this case it would be good to
say "yes" if the animation is in the delay phase too (as it currently
does). After the animation is finished, we should drop the layer, i.e.
current animations should be sufficient.
- In nsDisplayTransform::ShouldPrerenderTransformedContent. As with
nsDisplayOpacity::NeedsActiveLayer, we only need to pre-render
transformed content for animations that are current.
- In nsDisplayTransform::GetLayerState. As with
nsDisplayOpacity::NeedsActiveLayer, we only need to return active here
for current animations.
- In nsIFrame::IsTransformed. Here we test the display style to see if
there is a transform and also check if transform is being animated on the
compositor. As a result, we really only need HasAnimationsForCompositor
to return true for animations that are playing--otherwise the display
style will tell us if we're transformed or not. Returning true for all
current compositor animations (which is a superset of playing), however,
should not cause problems (we already return true for even more than
that).
- In nsIFrame::HasOpacityInternal which is much the same as
nsIFrame::IsTransformed and hence current should be fine.
3. AnimationCollection::CanThrottleAnimation
Here, HasAnimationOfProperty is used when looking for animations that would
disqualify us from throttling the animation by having an out-of-date layer
generation or being a transform animation that affects scroll and so requires
that we do the occasional main thread sample to update scrollbars.
It would seem like current animations are enough here too. One interesting
case is where we *had* a compositor animation but it has finished or been
cancelled. In that case, the animation won't be current and we should not
throttle the animation since we need to take it off its layer.
It turns out checking for current animations is still ok in this case too.
The reasoning is as follows:
- If the animation is newly-finished, we'll pick that up in
Animation::CanThrottle and return false then.
- If the animation is newly-idle then there are two cases:
If the cancelled animation was the only compositor animation then
AnimationCollection::CanPerformOnCompositorThread will notice that there
are no playing compositor animations and return false and
AnimationCollection::CanThrottleAnimation will never be called.
If there are other compositor animations running, then
AnimationCollection::CanThrottleAnimation will still return false because
whatever cancelled the animation will update the animation generation and
we'll notice the mismatch between the layer animation generation and the
animation generation on the collection.
Based on the above analysis it appears that making
AnimationCollection::HasAnimationOfProperty return only current animations (and
simulatneously renaming it to HasCurrentAnimationOfProperty) is safe. Indeed, in
effect, we already do this for transitions but not for animations. This patch
generalizes this behavior to all animations.
This patch also updates test_animations_omta.html since it was incorrectly
testing that a finished opacity animation was still running on the compositor.
Finished animations should not run on the compositor and the changes in this
patch cause that to happen. The reason we don't just update this test to check
for RunningOn.MainThread is that for opacity animations, unlike transform
animations, we can't detect if an opacity on a layer was set by animation or
not. As a result, for opacity animations we typically test the opacity on
either the main thread or compositor in order to allow for the case where an
animation-set opacity is still lingering on the compositor.
GetMinAndMaxScaleForAnimationProperty in nsLayoutUtils uses IsFinishedTransition
to ignore finished transitions since they should not have any effect on current
or future scale values. We can generalize this, however, and say we are only
interested in animations that are *either*:
a) running or scheduled to run in the future, i.e. "current", OR
b) applying a value, including a finished animation with a forwards fill,
i.e. "in effect"
Elsewhere, animations that fulfil *either* of this conditions are referred to as
"relevant animations" so we can simply test for relevance in this function.
This patch causes transition events to be dispatched as a separate step after
sampling the transitions. Eventually this will allow us to sample transitions
from their timeline (independently of where they came from and in potentially
any order) by separating the concepts of sampling and event dispatch.
This patch moves the logic for queueing events out of the logic for flushing
transitions making it a separate step. It still doesn't delay the dispatch of
those events into a separate step, however. That is done in a subsequent patch.
This patch also makes sure to clear any queued events when the nsPresShell that
owns the transition manager is destroyed. We don't expect CSSTransition::Tick to
be called anywhere except nsTransitionManger::FlushTransitions so there
shouldn't be any orphaned events but for completeness it seems best to add this
now. (Later, when we tick transitions from their timeline we will need this.)
This patch introduces a separate flag to CSSTransition for tracking if a
transition is newly-finished so we can correctly dispatch the transitionend
event. Although, this may seem to be redundant with the "IsFinishedTransition"
we also track, that state will soon be removed in bug 1181392 and hence this
flag will be needed then.
Note that Animation already has flags mIsPreviousStateFinished and
mFinishedAtLastComposeStyle which would appear to be similar however,
- mIsPreviousStateFinished will be removed in bug 1178665 and is updated more
often than we queue events so it is not useful here.
- mFinishedAtLastComposeStyle is used to determine if we can throttle a style
update and is also updated more frequently than we queue events and hence
can't be used here.
Once we guarantee one call to Tick() per frame we may be able to simplify this
by tracking "state on last tick" but for now we need this additional flag on
CSSTransition. CSSAnimation has a similar flag for this
(mPreviousPhaseOrIteration) which we may be able to unify at the same point.
This simply uses the DelayedEventDispatcher in place of the previous array of
TransitionEventInfo objects. Doing the actual delayed dispatch is performed in
a separate patch.
Prior to this patch, CSSAnimation defined a method for converting an
nsCSSPseudoElements::Type to a nsString (but only for the set of
pseudo-elements that can have animations). We would like to re-use this
when setting up transition events so this patch moves it to
AnimationCollection. Re-using this method more widely means we can make
a few further simplifications to the code.
This patch extracts a utility class for queueing up a series of EventInfo
objects (of templated type) and then dispatching them. This covers the event
queuing behavior in nsAnimationManager so that we can reuse it in
nsTransitionManager.
The long-term plan is to drop the mozilla::css namespace altogether. Before we
go to much further with refactoring code in AnimationCommon, we should drop
usage of the mozilla::css namespace. Specifically, this patch moves the
CommonAnimationManager and AnimValuesStyleRule classes to the mozilla namespace.
This patch prepares the way for script-generated events by making
event dispatch a separate process that happens after sampling animations.
This will allow us to sample animations from their associated timeline
(removing the need for a further manager to tracker script-generated
animations).
Furthermore, once we sample animations from timelines the order in which they
are sampled is likely to be more or less random so by making event dispatch at
separate step, we have an opportunity to sort the events and dispatch in
a consistent and sensible order. It also ensures that event callbacks will
not be run until all animations (including transitions) have been updated
ensuring they see a consistent view of timing properties.
This patch only affects event handling for CSS animations. Transitions will
be dealt with in a subsequent patch.
There was a bug introduced in to animation_utils.js in
https://hg.mozilla.org/mozilla-central/rev/496e867cd2cd (bug 1070745). This
patch fixes this bug so we can be sure testing events correctly before messing
with them.
The goal of ComputeCollapsedBStartMargin is to collapse all of the
margins that collapse with a block's top margin. It does this by
scanning forward through the child list until it finds something that
blocks collapsing; it descends into children through recursion. When we
find a non-empty block or line, we stop collapsing and report to the
parent that the child is non-empty so that it stops collapsing as well.
This patch changes our behavior when we have clearance to do the same
thing that we do for non-empty lines or blocks (which makes both
occurrences of |goto done| be preceded by the same code). Without the
patch we would fail to report being non-empty to the parent (and instead
report emptiness based on the IsEmpty() method). This meant that,
without the patch, if a block has a child with clearance but also has
IsEmpty() true, we would stop scanning margins in that block after the
clearance, but start searching again for margins in the block's parent,
starting with the block's bottom margin. This patch sets *aBlockIsEmpty
to true in that case so that we do not pick up again in the block's
parent (or, potentially, grandparent, etc.).
This was introduced in bug 209694 (gecko-dev 13a65028) but became unused
through bug 292295 (gecko-dev 4593df2a57) and bug 300030 (gecko-dev
31f18988).
After this change, we have ShallowSizeOf{In,Ex}cludingThis(), which don't do
anything to measure children. (They can be combined with iteration to measure
children.)
After this change, we have ShallowSizeOf{In,Ex}cludingThis(), which don't do
anything to measure children. (They can be combined with iteration to measure
children.)
And we still have the existing single-arg SizeOf{In,Ex}cluding() functions,
which work if the entry type itself defines SizeOfExcludingThis().
This is because patch 4 now uses AddAndRemoveTransform hints for changes
that are other than adding and removing a transform. There's still a
little bit of transform-related stuff there too (which I did make
conditional in patch 2).
As expected, without the patch in patch 4, the filter and perspective
tests fail, but the added transform test passes. All the tests pass
locally with patch 4.
Note that this now uses AddAndRemoveTransform hints for changes that are
other than adding and removing a transform. Since there's still a
little bit of transform-related stuff there too (which I did make
conditional), I figure it's probably best to leave the name as-is,
although I'd be open to renaming it as well.
As expected, without the patch, the filter and perspective tests fail,
but the added transform test passes. All the tests pass locally with
the patch.
This adds an additional retry loop in block reflow that we can only
trigger when reflowing a block formatting context (replacedBlock
non-null). It can retry in two different ways, either with a narrower
width but at the same vertical position (when
ReplacedBlockFitsInAvailSpace is still true) or at a new vertical
position (which is treated as a form of clearance).
Fortunately we don't have to worry about margins collapsing *through*
such a boundary since we're dealing with a new block formatting context.
Note that Chromium passes all of the new bfc-displace-* tests, although
it moves the block formating context down unnecessarily in
bfc-shrink-1.html (which we do neither before nor after the patch),
though agrees with the width we have after the patch (but not before the
patch).
This is a temporary preference to allow for testing-in-the-wild by a larger
audience, for nightly builds. When 1177263 is fixed this can be removed.
---
layout/style/nsCSSParser.cpp | 14 ++++++++++++++
modules/libpref/init/all.js | 6 ++++++
2 files changed, 20 insertions(+)
After this change, we have PLDHashTable::ShallowSizeOf{In,Ex}cludingThis(),
which don't do anything to measure children. (They can be combined with
iteration to measure children.)
This patch also removes the PL_DHashTableSizeOf{In,Ex}cludingThis() functions.
They're not necessary because the methods can be used instead.
Finally, the patch deliberately converts some SizeOfExcludingThis() calls to
SizeOfIncludingThis(). These are all done on heap pointers so this change is
valid.
Bug 960465 (specifically part 6, changeset 7d16f2fd8329) changed the way we
process animation-only style changes. This caused us to update SMIL animations
more often than is needed.
This patch adjusts this behavior to update the style from SMIL animations less
frequently by tracking when animated values have been composited without adding
the corresponding changes to a restyle tracker.
Bug 1176077 introduced the parameter aDirtyRegion to
DrawPaintedLayerCallback, which allows the callback to recompute the
visibility of all items to be painted in that transaction in a single
go. However, this parameter can not always be determined correctly
when using RotatedBuffer, and using an incorrect value was causing
graphical glitches.
Make the parameter optional, and on null values do not perform the
optimisation. Pass null from ClientPaintedLayer, which uses
RotatedBuffer and was causing problems, but continue to pass the
correct value from other Layer implementations. This optimisation was
most important for tiled layers using progressive paint, so this is
okay.
When the refresh driver ticks it clears the RAF callbacks (content asks for another RAF if it desires) but it wasn't checking if it should exit high precision mode at this point.
The previous code seemed like it was using the wrong model that a RAF is persistent until it is revoked. But that is not the case.
This makes it clearer that, unlike how SizeOf*() functions usually work, this
doesn't measure any children hanging off the array.
And do likewise for nsTObserverArray.
AppendScrollPartsTo finds or creates a scroll id for the current scroll frame if IsMaybeScrollingActive() is true (otherwise it uses the null scrollid). IsMaybeScrollingActive() looks at mShouldBuildScrollableLayer, which we compute after the first call to AppendScrollPartsTo in ScrollFrameHelper::BuildDisplayList.
This means that on the first paint with a displayport set (or even if we create a displayport is ScrollFrameHelper::BuildDisplayList) we wouldn't layerize the scroll thumb in nsSliderFrame::BuildDisplayListForChildren because it looks for the current scroll id set on the display list builder. On subsequent paints this would be corrected so it caused reftest failures.
This patch causes transition events to be dispatched as a separate step after
sampling the transitions. Eventually this will allow us to sample transitions
from their timeline (independently of where they came from and in potentially
any order) by separating the concepts of sampling and event dispatch.
This patch moves the logic for queueing events out of the logic for flushing
transitions making it a separate step. It still doesn't delay the dispatch of
those events into a separate step, however. That is done in a subsequent patch.
This patch also makes sure to clear any queued events when the nsPresShell that
owns the transition manager is destroyed. We don't expect CSSTransition::Tick to
be called anywhere except nsTransitionManger::FlushTransitions so there
shouldn't be any orphaned events but for completeness it seems best to add this
now. (Later, when we tick transitions from their timeline we will need this.)
This patch introduces a separate flag to CSSTransition for tracking if a
transition is newly-finished so we can correctly dispatch the transitionend
event. Although, this may seem to be redundant with the "IsFinishedTransition"
we also track, that state will soon be removed in bug 1181392 and hence this
flag will be needed then.
Note that Animation already has flags mIsPreviousStateFinished and
mFinishedAtLastComposeStyle which would appear to be similar however,
- mIsPreviousStateFinished will be removed in bug 1178665 and is updated more
often than we queue events so it is not useful here.
- mFinishedAtLastComposeStyle is used to determine if we can throttle a style
update and is also updated more frequently than we queue events and hence
can't be used here.
Once we guarantee one call to Tick() per frame we may be able to simplify this
by tracking "state on last tick" but for now we need this additional flag on
CSSTransition. CSSAnimation has a similar flag for this
(mPreviousPhaseOrIteration) which we may be able to unify at the same point.
This simply uses the DelayedEventDispatcher in place of the previous array of
TransitionEventInfo objects. Doing the actual delayed dispatch is performed in
a separate patch.
Prior to this patch, CSSAnimation defined a method for converting an
nsCSSPseudoElements::Type to a nsString (but only for the set of
pseudo-elements that can have animations). We would like to re-use this
when setting up transition events so this patch moves it to
AnimationCollection. Re-using this method more widely means we can make
a few further simplifications to the code.
This patch extracts a utility class for queueing up a series of EventInfo
objects (of templated type) and then dispatching them. This covers the event
queuing behavior in nsAnimationManager so that we can reuse it in
nsTransitionManager.
The long-term plan is to drop the mozilla::css namespace altogether. Before we
go to much further with refactoring code in AnimationCommon, we should drop
usage of the mozilla::css namespace. Specifically, this patch moves the
CommonAnimationManager and AnimValuesStyleRule classes to the mozilla namespace.
This patch prepares the way for script-generated events by making
event dispatch a separate process that happens after sampling animations.
This will allow us to sample animations from their associated timeline
(removing the need for a further manager to tracker script-generated
animations).
Furthermore, once we sample animations from timelines the order in which they
are sampled is likely to be more or less random so by making event dispatch at
separate step, we have an opportunity to sort the events and dispatch in
a consistent and sensible order. It also ensures that event callbacks will
not be run until all animations (including transitions) have been updated
ensuring they see a consistent view of timing properties.
This patch only affects event handling for CSS animations. Transitions will
be dealt with in a subsequent patch.
There was a bug introduced in to animation_utils.js in
https://hg.mozilla.org/mozilla-central/rev/496e867cd2cd (bug 1070745). This
patch fixes this bug so we can be sure testing events correctly before messing
with them.
Without this change, nsBlockFrame::ReflowBlockFrame will fail to have
mayNeedRetry true, which means that it won't set
blockHTMLRS.mDiscoveredClearance, which means that on a descendant
replaced block we will fail to fall into any of the cases that call
ClearFloats. This change will cause us to hit the first ClearFloats
call and discover the need for clearance.
I tested locally that the new reftest fails without the patch and passes
with the patch.
We were returning a nullptr from AllocPRenderFrameParent in TabParent, which causes
a killhard abort in the child. We suspect this is occurring because the TabParent
is attempting to kick off drawing in a tab that's already closed (so there is no
frame loader, which means we can't create a PRenderFrameParent). So now, we return
a PRenderFrameParent* even if constructing it was unsuccessful, and the child
destroys it once it confirms that there is an invalid layer ID associated with
the RenderFrame.
We don't currently have a mechanism for rerendering when the front/back
flips, so we should disable running such animations on the compositor
thread for now until we do.
Bug 1186204 covers reenabling.
The reftest fails without the patch (showing a blue almost-square
rectangle), and passes with the patch.
The use of reftest-no-flush (added in patch 1) is needed to achieve the
failure without the patch, because the flushWindow() function in
reftest-content.js calls getBoundingClientRect() to flush rendering,
which has the side-effect of flushing style updates that have been
suppressed on the main thread while we're running an animation off the
main thread, which in turn covers up the bug.
FrameLayerManager::RecomputeItemsVisibility() was being called on every
call to FrameLayerBuilder::DrawPaintedLayer(), each time for the region
to be painted by that paint call. This is inefficient when progressive
paint is enabled. Change it so that we compute the visibility of all the
layer's items within the total region to be painted, but only on the
first paint after the display list has been modified.
