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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 #include "config.h" | 5 #include "config.h" |
6 | 6 |
7 #if USE(ACCELERATED_COMPOSITING) | 7 #if USE(ACCELERATED_COMPOSITING) |
8 #include "CCFrameRateCounter.h" | 8 #include "CCFrameRateCounter.h" |
9 | 9 |
10 #include "CCProxy.h" | 10 #include "CCProxy.h" |
11 #include <public/Platform.h> | 11 #include <public/Platform.h> |
12 #include <wtf/CurrentTime.h> | 12 #include <wtf/CurrentTime.h> |
13 | 13 |
14 namespace WebCore { | 14 namespace cc { |
15 | 15 |
16 const double CCFrameRateCounter::kFrameTooFast = 1.0 / 70.0; // measured in seco
nds | 16 const double CCFrameRateCounter::kFrameTooFast = 1.0 / 70.0; // measured in seco
nds |
17 const double CCFrameRateCounter::kFrameTooSlow = 1.0 / 12.0; | 17 const double CCFrameRateCounter::kFrameTooSlow = 1.0 / 12.0; |
18 const double CCFrameRateCounter::kDroppedFrameTime = 1.0 / 50.0; | 18 const double CCFrameRateCounter::kDroppedFrameTime = 1.0 / 50.0; |
19 | 19 |
20 // safeMod works on -1, returning m-1 in that case. | 20 // safeMod works on -1, returning m-1 in that case. |
21 static inline int safeMod(int number, int modulus) | 21 static inline int safeMod(int number, int modulus) |
22 { | 22 { |
23 return (number + modulus) % modulus; | 23 return (number + modulus) % modulus; |
24 } | 24 } |
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118 standardDeviation = sqrt(fpsVarianceNumerator / averageFPSCount); | 118 standardDeviation = sqrt(fpsVarianceNumerator / averageFPSCount); |
119 } | 119 } |
120 | 120 |
121 double CCFrameRateCounter::timeStampOfRecentFrame(int n) | 121 double CCFrameRateCounter::timeStampOfRecentFrame(int n) |
122 { | 122 { |
123 ASSERT(n >= 0 && n < kTimeStampHistorySize); | 123 ASSERT(n >= 0 && n < kTimeStampHistorySize); |
124 int desiredIndex = (frameIndex(m_currentFrameNumber) + n) % kTimeStampHistor
ySize; | 124 int desiredIndex = (frameIndex(m_currentFrameNumber) + n) % kTimeStampHistor
ySize; |
125 return m_timeStampHistory[desiredIndex]; | 125 return m_timeStampHistory[desiredIndex]; |
126 } | 126 } |
127 | 127 |
128 } // namespace WebCore | 128 } // namespace cc |
129 | 129 |
130 #endif // USE(ACCELERATED_COMPOSITING) | 130 #endif // USE(ACCELERATED_COMPOSITING) |
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