1 // Copyright 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CC_SCHEDULER_TIME_SOURCE_H_ 6 #define CC_SCHEDULER_TIME_SOURCE_H_ 7 8 #include "base/memory/ref_counted.h" 9 #include "base/time/time.h" 10 #include "cc/base/cc_export.h" 11 12 namespace cc { 13 14 class TimeSourceClient { 15 public: 16 virtual void OnTimerTick() = 0; 17 18 protected: 19 virtual ~TimeSourceClient() {} 20 }; 21 22 // An generic interface for getting a reliably-ticking timesource of 23 // a specified rate. 24 // 25 // Be sure to call SetActive(false) before releasing your reference to the 26 // timer, or it will keep on ticking! 27 class CC_EXPORT TimeSource : public base::RefCounted<TimeSource> { 28 public: 29 virtual void SetClient(TimeSourceClient* client) = 0; 30 virtual void SetActive(bool active) = 0; 31 virtual bool Active() const = 0; 32 virtual void SetTimebaseAndInterval(base::TimeTicks timebase, 33 base::TimeDelta interval) = 0; 34 virtual base::TimeTicks LastTickTime() = 0; 35 virtual base::TimeTicks NextTickTime() = 0; 36 37 protected: 38 virtual ~TimeSource() {} 39 40 private: 41 friend class base::RefCounted<TimeSource>; 42 }; 43 44 } // namespace cc 45 46 #endif // CC_SCHEDULER_TIME_SOURCE_H_ 47
