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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/utility/occlusion_tracker_pauser.h"
#include "ash/shell.h"
#include "base/functional/bind.h"
#include "ui/aura/window_tree_host.h"
#include "ui/compositor/compositor.h"
namespace ash {
OcclusionTrackerPauser::OcclusionTrackerPauser() = default;
OcclusionTrackerPauser::~OcclusionTrackerPauser() {
DCHECK(!observations_.IsObservingAnySource());
}
void OcclusionTrackerPauser::PauseUntilAnimationsEnd(base::TimeDelta timeout) {
for (aura::Window* root : Shell::GetAllRootWindows()) {
// Compositors may not be animating yet - start observing all of them. In
// fact, it is the common case that none will be animating at this point. We
// assume at least one compositor will start animating very soon, and
// unpause when all compositors are not animating after that.
Pause(root->GetHost()->compositor());
}
if (!scoped_pause_) {
scoped_pause_ =
std::make_unique<aura::WindowOcclusionTracker::ScopedPause>();
}
timer_.Stop();
if (!timeout.is_zero()) {
timer_.Start(FROM_HERE, timeout,
base::BindOnce(&OcclusionTrackerPauser::Shutdown,
base::Unretained(this), /*timed_out=*/true));
}
}
void OcclusionTrackerPauser::OnFirstAnimationStarted(
ui::Compositor* compositor) {
animating_compositors_.insert(compositor);
}
void OcclusionTrackerPauser::OnFirstNonAnimatedFrameStarted(
ui::Compositor* compositor) {
OnFinish(compositor);
}
void OcclusionTrackerPauser::OnCompositingShuttingDown(
ui::Compositor* compositor) {
OnFinish(compositor);
}
void OcclusionTrackerPauser::Pause(ui::Compositor* compositor) {
if (!observations_.IsObservingSource(compositor))
observations_.AddObservation(compositor);
if (compositor->IsAnimating()) {
animating_compositors_.insert(compositor);
}
}
void OcclusionTrackerPauser::OnFinish(ui::Compositor* compositor) {
animating_compositors_.erase(compositor);
if (observations_.IsObservingSource(compositor)) {
observations_.RemoveObservation(compositor);
}
if (!animating_compositors_.empty()) {
return;
}
Shutdown(/*timed_out=*/false);
}
void OcclusionTrackerPauser::Shutdown(bool timed_out) {
DCHECK(scoped_pause_);
LOG_IF(WARNING, timed_out)
<< "Unpausing because animations didn't start and end in time";
// We are finished pausing, cancel any outstanding timer which would call
// `Shutdown` again.
timer_.Stop();
scoped_pause_.reset();
observations_.RemoveAllObservations();
animating_compositors_.clear();
}
} // namespace ash
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