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| 1 // Copyright 2014 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_DEBUG_LAP_TIMER_H_ | |
| 6 #define CC_DEBUG_LAP_TIMER_H_ | |
| 7 | |
| 8 #include "base/time/time.h" | |
| 9 | |
| 10 namespace cc { | |
| 11 | |
| 12 // LapTimer is used to calculate average times per "Lap" in perf tests. | |
| 13 // Current() reports the time since the last call to Start(). | |
| 14 // Store() adds the time since the last call to Start() to the accumulator, and | |
| 15 // resets the start time to now. Stored() returns the accumulated time. | |
| 16 // NextLap increments the lap counter, used in counting the per lap averages. | |
| 17 // If you initialize the LapTimer with a non zero warmup_laps, it will ignore | |
| 18 // the times for that many laps at the start. | |
| 19 // If you set the time_limit then you can use HasTimeLimitExpired() to see if | |
| 20 // the current accumulated time has crossed that threshold, with an optimization | |
| 21 // that it only tests this every check_interval laps. | |
| 22 class LapTimer { | |
| 23 public: | |
| 24 LapTimer(int warmup_laps, base::TimeDelta time_limit, int check_interval); | |
| 25 // Resets the timer back to it's starting state. | |
| 26 void Reset(); | |
| 27 // Sets the start point to now. | |
| 28 void Start(); | |
| 29 // Returns true if there are no more warmup laps to do. | |
| 30 bool IsWarmedUp(); | |
| 31 // Advance the lap counter and update the accumulated time. | |
| 32 // The accumulated time is only updated every check_interval laps. | |
| 33 // If accumulating then the start point will also be updated. | |
| 34 void NextLap(); | |
| 35 // Returns true if the stored time has exceeded the time limit specified. | |
| 36 // May cause a call to Store(). | |
| 37 bool HasTimeLimitExpired(); | |
| 38 // Returns true if all lap times have been timed. Only true every n'th | |
| 39 // lap, where n = check_interval. | |
| 40 bool HasTimedAllLaps(); | |
| 41 // The average milliseconds per lap. | |
| 42 float MsPerLap(); | |
| 43 // The number of laps per second. | |
| 44 float LapsPerSecond(); | |
| 45 // The number of laps recorded. | |
| 46 int NumLaps(); | |
| 47 | |
| 48 private: | |
| 49 base::TimeDelta start_time_; | |
| 50 base::TimeDelta accumulator_; | |
| 51 int num_laps_; | |
| 52 int warmup_laps_; | |
| 53 int remaining_warmups_; | |
| 54 int remaining_no_check_laps_; | |
| 55 base::TimeDelta time_limit_; | |
| 56 int check_interval_; | |
| 57 | |
| 58 DISALLOW_COPY_AND_ASSIGN(LapTimer); | |
| 59 }; | |
| 60 | |
| 61 } // namespace cc | |
| 62 | |
| 63 #endif // CC_DEBUG_LAP_TIMER_H_ | |
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