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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_IDLE_TIME_ESTIMATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_IDLE_TIME_ESTIMATOR_H_
#include "base/macros.h"
#include "base/task/task_observer.h"
#include "base/time/tick_clock.h"
#include "cc/base/rolling_time_delta_history.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/scheduler/main_thread/main_thread_task_queue.h"
namespace blink {
namespace scheduler {
// Estimates how much idle time there is available. Ignores nested tasks.
class PLATFORM_EXPORT IdleTimeEstimator : public base::TaskObserver {
public:
IdleTimeEstimator(
const base::TickClock* time_source,
int sample_count,
double estimation_percentile);
~IdleTimeEstimator() override;
// Expected Idle time is defined as: |compositor_frame_interval| minus
// expected compositor task duration.
base::TimeDelta GetExpectedIdleDuration(
base::TimeDelta compositor_frame_interval) const;
void DidCommitFrameToCompositor();
void Clear();
// TaskObserver implementation:
void WillProcessTask(const base::PendingTask& pending_task,
bool was_blocked_or_low_priority) override;
void DidProcessTask(const base::PendingTask& pending_task) override;
void AddCompositorTaskQueue(
scoped_refptr<MainThreadTaskQueue> compositor_task_queue);
void RemoveCompositorTaskQueue(
scoped_refptr<MainThreadTaskQueue> compositor_task_queue);
private:
cc::RollingTimeDeltaHistory per_frame_compositor_task_runtime_;
const base::TickClock* time_source_; // NOT OWNED
double estimation_percentile_;
base::TimeTicks task_start_time_;
base::TimeTicks prev_commit_time_;
base::TimeDelta cumulative_compositor_runtime_;
int nesting_level_;
bool did_commit_;
DISALLOW_COPY_AND_ASSIGN(IdleTimeEstimator);
};
} // namespace scheduler
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_IDLE_TIME_ESTIMATOR_H_
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