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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 "cc/output/begin_frame_args.h" | 5 #include "cc/output/begin_frame_args.h" |
6 #include "ui/gfx/frame_time.h" | 6 #include "ui/gfx/frame_time.h" |
7 | 7 |
8 namespace cc { | 8 namespace cc { |
9 | 9 |
10 BeginFrameArgs::BeginFrameArgs() | 10 BeginFrameArgs::BeginFrameArgs() |
(...skipping 17 matching lines...) Expand all Loading... |
28 } | 28 } |
29 | 29 |
30 BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor() { | 30 BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor() { |
31 // For WebView/SynchronousCompositor, we always want to draw immediately, | 31 // For WebView/SynchronousCompositor, we always want to draw immediately, |
32 // so we set the deadline to 0 and guess that the interval is 16 milliseconds. | 32 // so we set the deadline to 0 and guess that the interval is 16 milliseconds. |
33 return BeginFrameArgs(gfx::FrameTime::Now(), | 33 return BeginFrameArgs(gfx::FrameTime::Now(), |
34 base::TimeTicks(), | 34 base::TimeTicks(), |
35 DefaultInterval()); | 35 DefaultInterval()); |
36 } | 36 } |
37 | 37 |
38 BeginFrameArgs BeginFrameArgs::CreateForTesting() { | |
39 base::TimeTicks now = gfx::FrameTime::Now(); | |
40 return BeginFrameArgs(now, | |
41 now + (DefaultInterval() / 2), | |
42 DefaultInterval()); | |
43 } | |
44 | |
45 BeginFrameArgs BeginFrameArgs::CreateExpiredForTesting() { | |
46 base::TimeTicks now = gfx::FrameTime::Now(); | |
47 return BeginFrameArgs(now, | |
48 now - DefaultInterval(), | |
49 DefaultInterval()); | |
50 } | |
51 | |
52 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in | 38 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in |
53 // cases where a good estimated draw time is not known. Using 1/3 of the vsync | 39 // cases where a good estimated draw time is not known. Using 1/3 of the vsync |
54 // as the default adjustment gives the Browser the last 1/3 of a frame to | 40 // as the default adjustment gives the Browser the last 1/3 of a frame to |
55 // produce output, the Renderer Impl thread the middle 1/3 of a frame to produce | 41 // produce output, the Renderer Impl thread the middle 1/3 of a frame to produce |
56 // ouput, and the Renderer Main thread the first 1/3 of a frame to produce | 42 // ouput, and the Renderer Main thread the first 1/3 of a frame to produce |
57 // output. | 43 // output. |
58 base::TimeDelta BeginFrameArgs::DefaultDeadlineAdjustment() { | 44 base::TimeDelta BeginFrameArgs::DefaultDeadlineAdjustment() { |
59 return base::TimeDelta::FromMicroseconds(-16666 / 3); | 45 return base::TimeDelta::FromMicroseconds(-16666 / 3); |
60 } | 46 } |
61 | 47 |
62 base::TimeDelta BeginFrameArgs::DefaultInterval() { | 48 base::TimeDelta BeginFrameArgs::DefaultInterval() { |
63 return base::TimeDelta::FromMicroseconds(16666); | 49 return base::TimeDelta::FromMicroseconds(16666); |
64 } | 50 } |
65 | 51 |
66 base::TimeDelta BeginFrameArgs::DefaultRetroactiveBeginFramePeriod() { | 52 base::TimeDelta BeginFrameArgs::DefaultRetroactiveBeginFramePeriod() { |
67 return base::TimeDelta::FromMicroseconds(4444); | 53 return base::TimeDelta::FromMicroseconds(4444); |
68 } | 54 } |
69 | 55 |
70 } // namespace cc | 56 } // namespace cc |
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