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 #include "cc/debug/lap_timer.h" 6 7 #include "base/logging.h" 8 9 namespace cc { 10 11 namespace { 12 13 base::TimeTicks Now() { 14 return base::TimeTicks::IsThreadNowSupported() 15 ? base::TimeTicks::ThreadNow() 16 : base::TimeTicks::HighResNow(); 17 } 18 19 } // namespace 20 21 LapTimer::LapTimer(int warmup_laps, 22 base::TimeDelta time_limit, 23 int check_interval) 24 : warmup_laps_(warmup_laps), 25 remaining_warmups_(0), 26 remaining_no_check_laps_(0), 27 time_limit_(time_limit), 28 check_interval_(check_interval) { 29 DCHECK_GT(check_interval, 0); 30 Reset(); 31 } 32 33 void LapTimer::Reset() { 34 accumulator_ = base::TimeDelta(); 35 num_laps_ = 0; 36 remaining_warmups_ = warmup_laps_; 37 remaining_no_check_laps_ = check_interval_; 38 Start(); 39 } 40 41 void LapTimer::Start() { 42 start_time_ = Now(); 43 } 44 45 bool LapTimer::IsWarmedUp() { return remaining_warmups_ <= 0; } 46 47 void LapTimer::NextLap() { 48 if (!IsWarmedUp()) { 49 --remaining_warmups_; 50 if (IsWarmedUp()) { 51 Start(); 52 } 53 return; 54 } 55 ++num_laps_; 56 --remaining_no_check_laps_; 57 if (!remaining_no_check_laps_) { 58 base::TimeTicks now = Now(); 59 accumulator_ += now - start_time_; 60 start_time_ = now; 61 remaining_no_check_laps_ = check_interval_; 62 } 63 } 64 65 bool LapTimer::HasTimeLimitExpired() { return accumulator_ >= time_limit_; } 66 67 bool LapTimer::HasTimedAllLaps() { return !(num_laps_ % check_interval_); } 68 69 float LapTimer::MsPerLap() { 70 DCHECK(HasTimedAllLaps()); 71 return accumulator_.InMillisecondsF() / num_laps_; 72 } 73 74 float LapTimer::LapsPerSecond() { 75 DCHECK(HasTimedAllLaps()); 76 return num_laps_ / accumulator_.InSecondsF(); 77 } 78 79 int LapTimer::NumLaps() { return num_laps_; } 80 81 } // namespace cc 82
