| // Copyright 2014 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_DEBUG_LAP_TIMER_H_ |
| #define CC_DEBUG_LAP_TIMER_H_ |
| |
| #include "base/macros.h" |
| #include "base/time/time.h" |
| #include "cc/base/cc_export.h" |
| |
| namespace cc { |
| |
| // LapTimer is used to calculate average times per "Lap" in perf tests. |
| // Current() reports the time since the last call to Start(). |
| // Store() adds the time since the last call to Start() to the accumulator, and |
| // resets the start time to now. Stored() returns the accumulated time. |
| // NextLap increments the lap counter, used in counting the per lap averages. |
| // If you initialize the LapTimer with a non zero warmup_laps, it will ignore |
| // the times for that many laps at the start. |
| // If you set the time_limit then you can use HasTimeLimitExpired() to see if |
| // the current accumulated time has crossed that threshold, with an optimization |
| // that it only tests this every check_interval laps. |
| class CC_EXPORT LapTimer { |
| public: |
| LapTimer(int warmup_laps, base::TimeDelta time_limit, int check_interval); |
| // Create LapTimer with sensible default values. |
| LapTimer(); |
| // Resets the timer back to it's starting state. |
| void Reset(); |
| // Sets the start point to now. |
| void Start(); |
| // Returns true if there are no more warmup laps to do. |
| bool IsWarmedUp(); |
| // Advance the lap counter and update the accumulated time. |
| // The accumulated time is only updated every check_interval laps. |
| // If accumulating then the start point will also be updated. |
| void NextLap(); |
| // Returns true if the stored time has exceeded the time limit specified. |
| // May cause a call to Store(). |
| bool HasTimeLimitExpired(); |
| // Returns true if all lap times have been timed. Only true every n'th |
| // lap, where n = check_interval. |
| bool HasTimedAllLaps(); |
| // The average milliseconds per lap. |
| float MsPerLap(); |
| // The number of laps per second. |
| float LapsPerSecond(); |
| // The number of laps recorded. |
| int NumLaps(); |
| |
| private: |
| base::TimeDelta start_time_; |
| base::TimeDelta accumulator_; |
| int num_laps_; |
| int warmup_laps_; |
| int remaining_warmups_; |
| int remaining_no_check_laps_; |
| base::TimeDelta time_limit_; |
| int check_interval_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LapTimer); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_DEBUG_LAP_TIMER_H_ |