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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 COMPONENTS_SCHEDULER_RENDERER_IDLE_TIME_ESTIMATOR_H_
#define COMPONENTS_SCHEDULER_RENDERER_IDLE_TIME_ESTIMATOR_H_
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/time/tick_clock.h"
#include "cc/base/rolling_time_delta_history.h"
#include "components/scheduler/base/task_queue.h"
#include "components/scheduler/scheduler_export.h"
namespace scheduler {
// Estimates how much idle time there is available. Ignores nested tasks.
class SCHEDULER_EXPORT IdleTimeEstimator
: public base::MessageLoop::TaskObserver {
public:
IdleTimeEstimator(const scoped_refptr<TaskQueue>& compositor_task_runner,
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) override;
void DidProcessTask(const base::PendingTask& pending_task) override;
private:
scoped_refptr<TaskQueue> compositor_task_runner_;
cc::RollingTimeDeltaHistory per_frame_compositor_task_runtime_;
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
#endif // COMPONENTS_SCHEDULER_RENDERER_IDLE_TIME_ESTIMATOR_H_
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