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| 1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 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 CCFrameRateCounter_h | 5 #ifndef CCFrameRateCounter_h |
| 6 #define CCFrameRateCounter_h | 6 #define CCFrameRateCounter_h |
| 7 | 7 |
| 8 #if USE(ACCELERATED_COMPOSITING) | 8 #if USE(ACCELERATED_COMPOSITING) |
| 9 | 9 |
| 10 #include <wtf/Noncopyable.h> | 10 #include "base/basictypes.h" |
| 11 #include <wtf/PassOwnPtr.h> | 11 #include <wtf/PassOwnPtr.h> |
| 12 | 12 |
| 13 namespace cc { | 13 namespace cc { |
| 14 | 14 |
| 15 // This class maintains a history of timestamps, and provides functionality to | 15 // This class maintains a history of timestamps, and provides functionality to |
| 16 // intelligently compute average frames per second (and standard deviation). | 16 // intelligently compute average frames per second (and standard deviation). |
| 17 class CCFrameRateCounter { | 17 class CCFrameRateCounter { |
| 18 WTF_MAKE_NONCOPYABLE(CCFrameRateCounter); | |
| 19 public: | 18 public: |
| 20 static PassOwnPtr<CCFrameRateCounter> create() | 19 static PassOwnPtr<CCFrameRateCounter> create() |
| 21 { | 20 { |
| 22 return adoptPtr(new CCFrameRateCounter()); | 21 return adoptPtr(new CCFrameRateCounter()); |
| 23 } | 22 } |
| 24 | 23 |
| 25 void markBeginningOfFrame(double timestamp); | 24 void markBeginningOfFrame(double timestamp); |
| 26 void markEndOfFrame(); | 25 void markEndOfFrame(); |
| 27 int currentFrameNumber() const { return m_currentFrameNumber; } | 26 int currentFrameNumber() const { return m_currentFrameNumber; } |
| 28 void getAverageFPSAndStandardDeviation(double& averageFPS, double& standardD
eviation) const; | 27 void getAverageFPSAndStandardDeviation(double& averageFPS, double& standardD
eviation) const; |
| (...skipping 26 matching lines...) Expand all Loading... |
| 55 // (naively) assume that it missed a screen refresh; that is, we dropped a f
rame. | 54 // (naively) assume that it missed a screen refresh; that is, we dropped a f
rame. |
| 56 // FIXME: Determine this threshold based on monitor refresh rate, crbug.com/
138642. | 55 // FIXME: Determine this threshold based on monitor refresh rate, crbug.com/
138642. |
| 57 static const double kDroppedFrameTime; | 56 static const double kDroppedFrameTime; |
| 58 | 57 |
| 59 static const int kTimeStampHistorySize = 120; | 58 static const int kTimeStampHistorySize = 120; |
| 60 | 59 |
| 61 int m_currentFrameNumber; | 60 int m_currentFrameNumber; |
| 62 double m_timeStampHistory[kTimeStampHistorySize]; | 61 double m_timeStampHistory[kTimeStampHistorySize]; |
| 63 | 62 |
| 64 int m_droppedFrameCount; | 63 int m_droppedFrameCount; |
| 64 |
| 65 DISALLOW_COPY_AND_ASSIGN(CCFrameRateCounter); |
| 65 }; | 66 }; |
| 66 | 67 |
| 67 } // namespace cc | 68 } // namespace cc |
| 68 | 69 |
| 69 #endif // USE(ACCELERATED_COMPOSITING) | 70 #endif // USE(ACCELERATED_COMPOSITING) |
| 70 | 71 |
| 71 #endif | 72 #endif |
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