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1 // Copyright 2016 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 "content/browser/compositor/gpu_vsync_begin_frame_source.h" | |
6 | |
7 namespace content { | |
8 | |
9 GpuVSyncBeginFrameSource::GpuVSyncBeginFrameSource( | |
10 GpuVSyncControl* vsync_control) | |
11 : vsync_control_(vsync_control), | |
12 enabled_(false), | |
13 next_sequence_number_(cc::BeginFrameArgs::kStartingFrameNumber) { | |
14 DCHECK(vsync_control); | |
15 } | |
16 | |
17 GpuVSyncBeginFrameSource::~GpuVSyncBeginFrameSource() = default; | |
18 | |
19 void GpuVSyncBeginFrameSource::AddObserver(cc::BeginFrameObserver* obs) { | |
20 DCHECK(obs); | |
21 DCHECK(observers_.find(obs) == observers_.end()); | |
22 | |
23 obs->OnBeginFrameSourcePausedChanged(false); | |
24 | |
25 bool observers_was_empty = observers_.empty(); | |
26 observers_.insert(obs); | |
27 if (observers_was_empty) | |
28 EnableVSync(true); | |
29 | |
30 // Send a MISSED begin frame if necessary. | |
31 if (previous_begin_frame_args_.IsValid()) { | |
32 cc::BeginFrameArgs last_args = obs->LastUsedBeginFrameArgs(); | |
33 if (!last_args.IsValid() || | |
34 (previous_begin_frame_args_.frame_time > last_args.frame_time)) { | |
35 DCHECK((previous_begin_frame_args_.source_id != last_args.source_id) || | |
36 (previous_begin_frame_args_.sequence_number > | |
37 last_args.sequence_number)); | |
38 | |
39 previous_begin_frame_args_.type = cc::BeginFrameArgs::MISSED; | |
40 OnBeginFrame(obs, previous_begin_frame_args_); | |
41 } | |
42 } | |
43 } | |
44 | |
45 void GpuVSyncBeginFrameSource::RemoveObserver(cc::BeginFrameObserver* obs) { | |
46 DCHECK(obs); | |
47 DCHECK(observers_.find(obs) != observers_.end()); | |
48 | |
49 observers_.erase(obs); | |
50 if (observers_.empty()) { | |
51 previous_begin_frame_args_ = cc::BeginFrameArgs(); | |
52 EnableVSync(false); | |
53 } | |
54 } | |
55 | |
56 void GpuVSyncBeginFrameSource::DidFinishFrame(cc::BeginFrameObserver* obs, | |
57 const cc::BeginFrameAck& ack) {} | |
58 | |
59 bool GpuVSyncBeginFrameSource::IsThrottled() const { | |
60 return true; | |
61 } | |
62 | |
63 void GpuVSyncBeginFrameSource::OnUpdateVSyncParameters( | |
64 base::TimeTicks timebase, | |
65 base::TimeDelta interval) { | |
66 if (!enabled_) | |
67 return; | |
68 | |
69 base::TimeTicks now = base::TimeTicks::Now(); | |
70 base::TimeTicks deadline = now.SnappedToNextTick(timebase, interval); | |
71 | |
72 TRACE_EVENT1("cc", "GpuVSyncBeginFrameSource::OnUpdateVSyncParameters", | |
73 "vsync_delay", (now - timebase).ToInternalValue()); | |
74 | |
75 next_sequence_number_++; | |
76 OnBeginFrame(cc::BeginFrameArgs::Create( | |
77 BEGINFRAME_FROM_HERE, source_id(), next_sequence_number_, timebase, | |
78 deadline, interval, cc::BeginFrameArgs::NORMAL)); | |
79 } | |
80 | |
81 void GpuVSyncBeginFrameSource::SetAuthoritativeVSyncInterval( | |
82 base::TimeDelta interval) { | |
83 NOTREACHED(); | |
84 } | |
85 | |
86 void GpuVSyncBeginFrameSource::OnBeginFrame(const cc::BeginFrameArgs& args) { | |
87 previous_begin_frame_args_ = args; | |
88 std::unordered_set<cc::BeginFrameObserver*> observers(observers_); | |
89 for (auto* obs : observers) | |
90 OnBeginFrame(obs, args); | |
91 } | |
92 | |
93 /* static */ | |
94 void GpuVSyncBeginFrameSource::OnBeginFrame(cc::BeginFrameObserver* obs, | |
95 const cc::BeginFrameArgs& args) { | |
96 cc::BeginFrameArgs last_args = obs->LastUsedBeginFrameArgs(); | |
97 | |
98 if (last_args.IsValid()) { | |
99 base::TimeDelta delta = args.frame_time - last_args.frame_time; | |
100 if (delta < args.interval / 2.0) { | |
stanisc
2017/01/12 00:52:50
TODO: this needs logic similar to DelayBasedBeginF
| |
101 TRACE_EVENT1("cc", "GpuVSyncBeginFrameSource::OnBeginFrame", "delta", | |
102 delta.ToInternalValue()); | |
103 } | |
104 } | |
105 | |
106 obs->OnBeginFrame(args); | |
107 } | |
108 | |
109 void GpuVSyncBeginFrameSource::EnableVSync(bool enabled) { | |
110 enabled_ = enabled; | |
111 vsync_control_->EnableVSync(enabled); | |
112 } | |
113 | |
114 } // namespace content | |
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