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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ | 5 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ |
6 #define CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ | 6 #define CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "base/macros.h" | 10 #include "base/macros.h" |
11 #include "base/time/time.h" | 11 #include "base/time/time.h" |
12 | 12 |
13 namespace vr_shell { | 13 namespace vr_shell { |
14 | 14 |
| 15 class SampleQueue { |
| 16 public: |
| 17 explicit SampleQueue(size_t window_size); |
| 18 ~SampleQueue(); |
| 19 |
| 20 int64_t GetSum() const { return sum_; } |
| 21 |
| 22 void AddSample(int64_t value); |
| 23 |
| 24 size_t GetCount() const { return samples_.size(); } |
| 25 |
| 26 // Get sliding window size for tests. |
| 27 size_t GetWindowSize() const { return window_size_; } |
| 28 |
| 29 private: |
| 30 int64_t sum_ = 0; |
| 31 size_t current_index_ = 0; |
| 32 size_t window_size_; |
| 33 std::vector<int64_t> samples_; |
| 34 }; |
| 35 |
15 // Computes fps based on submitted frame times. | 36 // Computes fps based on submitted frame times. |
16 class FPSMeter { | 37 class FPSMeter { |
17 public: | 38 public: |
18 FPSMeter(); | 39 FPSMeter(); |
| 40 explicit FPSMeter(size_t window_size); |
19 ~FPSMeter(); | 41 ~FPSMeter(); |
20 | 42 |
21 void AddFrame(const base::TimeTicks& time_stamp); | 43 void AddFrame(const base::TimeTicks& time_stamp); |
22 | 44 |
23 bool CanComputeFPS() const; | 45 bool CanComputeFPS() const; |
24 | 46 |
25 double GetFPS() const; | 47 double GetFPS() const; |
26 | 48 |
27 // Get sliding window size for tests. | 49 // Get sliding window size for tests. |
28 size_t GetNumFrameTimes(); | 50 size_t GetNumFrameTimes(); |
29 | 51 |
30 private: | 52 private: |
31 size_t current_index_; | 53 SampleQueue frame_times_; |
32 int64_t total_time_us_; | |
33 base::TimeTicks last_time_stamp_; | 54 base::TimeTicks last_time_stamp_; |
34 std::vector<base::TimeDelta> frame_times_; | |
35 DISALLOW_COPY_AND_ASSIGN(FPSMeter); | 55 DISALLOW_COPY_AND_ASSIGN(FPSMeter); |
36 }; | 56 }; |
37 | 57 |
| 58 class SlidingAverage { |
| 59 public: |
| 60 explicit SlidingAverage(size_t window_size); |
| 61 ~SlidingAverage(); |
| 62 |
| 63 void AddSample(int64_t value); |
| 64 int64_t GetAverageOrDefault(int64_t default_value) const; |
| 65 int64_t GetAverage() const { return GetAverageOrDefault(0); } |
| 66 |
| 67 private: |
| 68 SampleQueue values_; |
| 69 }; |
| 70 |
38 } // namespace vr_shell | 71 } // namespace vr_shell |
39 | 72 |
40 #endif // CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ | 73 #endif // CHROME_BROWSER_ANDROID_VR_SHELL_FPS_METER_H_ |
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