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// Copyright 2022 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/ambient/ui/ambient_animation_player.h"
#include <optional>
#include <string>
#include <utility>
#include "ash/ambient/ui/ambient_animation_progress_tracker.h"
#include "ash/public/cpp/ambient/ambient_ui_model.h"
#include "ash/utility/lottie_util.h"
#include "base/check.h"
#include "base/logging.h"
#include "base/no_destructor.h"
#include "base/strings/strcat.h"
#include "base/time/time.h"
#include "cc/paint/skottie_marker.h"
#include "cc/paint/skottie_wrapper.h"
#include "ui/views/controls/animated_image_view.h"
namespace ash {
namespace {
std::optional<base::TimeDelta> FindCycleRestartTimestamp(
const cc::SkottieWrapper& skottie) {
static const base::NoDestructor<std::string> kRestartMarkerName(
base::StrCat({kLottieCustomizableIdPrefix, "_Marker_CycleRestart"}));
DCHECK(skottie.is_valid());
std::optional<base::TimeDelta> restart_timestamp;
for (const cc::SkottieMarker& marker : skottie.GetAllMarkers()) {
if (marker.name != *kRestartMarkerName) {
continue;
} else if (restart_timestamp.has_value()) {
LOG(DFATAL) << "Multiple markers with name " << *kRestartMarkerName
<< " found in animation file. Defaulting to first one.";
} else {
// |marker.begin_time| is a normalized timestamp in range [0, 1), where 1
// is the animation's cycle duration.
restart_timestamp.emplace(base::Seconds(skottie.duration()) *
marker.begin_time);
DVLOG(1) << "Found restart marker at timestamp " << *restart_timestamp;
}
}
return restart_timestamp;
}
} // namespace
AmbientAnimationPlayer::AmbientAnimationPlayer(
views::AnimatedImageView* animated_image_view,
AmbientAnimationProgressTracker* progress_tracker)
: animated_image_view_(animated_image_view),
progress_tracker_(progress_tracker) {
DCHECK(animated_image_view_);
lottie::Animation* animation = animated_image_view_->animated_image();
DCHECK(animation);
DCHECK(progress_tracker_);
lottie::Animation::PlaybackConfig playback_config;
// If there are existing animations in this ambient mode session, start
// playing from the existing animations' timestamps. This gives rough
// synchronization across animations. The animations' timestamps should not
// diverge over time because AnimatedImageView makes time steps that
// ultimately reflect real time (i.e. it does not step by a fixed amount each
// frame). Thus, there may be transient periods where the animations diverge
// due to random system instability, but they should all converge again
// eventually.
if (progress_tracker_->HasActiveAnimations()) {
AmbientAnimationProgressTracker::ImmutableParams immutable_params =
progress_tracker_->GetImmutableParams();
AmbientAnimationProgressTracker::Progress global_progress =
progress_tracker_->GetGlobalProgress();
playback_config = {
immutable_params.scheduled_cycles,
global_progress.current_timestamp * immutable_params.total_duration,
global_progress.num_completed_cycles, immutable_params.style};
} else {
std::optional<base::TimeDelta> cycle_restart_timestamp_found =
FindCycleRestartTimestamp(*animation->skottie());
if (cycle_restart_timestamp_found.has_value()) {
cycle_restart_timestamp_ = *cycle_restart_timestamp_found;
if (cycle_restart_timestamp_ >= animation->GetAnimationDuration()) {
LOG(DFATAL) << "Animation has invalid cycle restart timestamp "
<< cycle_restart_timestamp_ << ". Total cycle duration "
<< animation->GetAnimationDuration();
}
} else {
DVLOG(1) << "Restart marker not found in animation. Defaulting to cycle "
"restart at timestamp 0";
DCHECK(cycle_restart_timestamp_.is_zero());
}
playback_config = lottie::Animation::PlaybackConfig(
{{base::TimeDelta(), animation->GetAnimationDuration()},
{cycle_restart_timestamp_, animation->GetAnimationDuration()}},
/*initial_offset=*/base::TimeDelta(), /*initial_completed_cycles=*/0,
lottie::Animation::Style::kLoop);
}
animation->SetPlaybackSpeed(
AmbientUiModel::Get()->animation_playback_speed());
progress_tracker_->RegisterAnimation(animation);
animated_image_view_->Play(std::move(playback_config));
}
AmbientAnimationPlayer::~AmbientAnimationPlayer() {
animated_image_view_->Stop();
}
} // namespace ash
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