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// Copyright 2011 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 CC_SCHEDULER_TIME_SOURCE_H_
#define CC_SCHEDULER_TIME_SOURCE_H_
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "cc/base/cc_export.h"
namespace cc {
class CC_EXPORT TimeSourceClient {
public:
virtual void OnTimerTick() = 0;
protected:
virtual ~TimeSourceClient() {}
};
// An generic interface for getting a reliably-ticking timesource of
// a specified rate.
//
// Be sure to call SetActive(false) before releasing your reference to the
// timer, or it will keep on ticking!
class CC_EXPORT TimeSource : public base::RefCounted<TimeSource> {
public:
virtual void SetClient(TimeSourceClient* client) = 0;
// If transitioning from not active to active, SetActive will return the
// timestamp of the most recenly missed tick that did not have OnTimerTick
// called.
virtual base::TimeTicks SetActive(bool active) = 0;
virtual bool Active() const = 0;
virtual void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval) = 0;
virtual base::TimeTicks LastTickTime() const = 0;
virtual base::TimeTicks NextTickTime() const = 0;
protected:
virtual ~TimeSource() {}
private:
friend class base::RefCounted<TimeSource>;
};
} // namespace cc
#endif // CC_SCHEDULER_TIME_SOURCE_H_
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