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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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 "content/browser/renderer_host/begin_frame_observer_proxy.h" | 5 #include "content/browser/renderer_host/begin_frame_observer_proxy.h" |
6 | 6 |
7 namespace content { | 7 namespace content { |
8 | 8 |
9 BeginFrameObserverProxy::BeginFrameObserverProxy( | 9 BeginFrameObserverProxy::BeginFrameObserverProxy( |
10 BeginFrameObserverProxyClient* client) | 10 BeginFrameObserverProxyClient* client) |
11 : needs_begin_frames_(false), | 11 : needs_begin_frames_(false), |
| 12 needs_one_begin_frame_(false), |
| 13 observing_begin_frames_(false), |
12 client_(client), | 14 client_(client), |
13 compositor_(nullptr) { | 15 compositor_(nullptr) {} |
14 } | |
15 | 16 |
16 BeginFrameObserverProxy::~BeginFrameObserverProxy() { | 17 BeginFrameObserverProxy::~BeginFrameObserverProxy() { |
17 DCHECK(!compositor_); | 18 DCHECK(!compositor_); |
18 } | 19 } |
19 | 20 |
20 void BeginFrameObserverProxy::SetNeedsBeginFrames(bool needs_begin_frames) { | 21 void BeginFrameObserverProxy::SetNeedsBeginFrames(bool needs_begin_frames) { |
21 if (needs_begin_frames_ == needs_begin_frames) | 22 if (needs_begin_frames_ == needs_begin_frames) |
22 return; | 23 return; |
23 | 24 |
24 needs_begin_frames_ = needs_begin_frames; | 25 needs_begin_frames_ = needs_begin_frames; |
| 26 UpdateBeginFrameObservation(); |
| 27 } |
25 | 28 |
26 // In some cases, BeginFrame message is requested before |client_|'s window is | 29 void BeginFrameObserverProxy::SetNeedsOneBeginFrame() { |
27 // added in the root window hierarchy. | 30 if (needs_one_begin_frame_) |
28 if (!compositor_) | |
29 return; | 31 return; |
30 | 32 |
31 if (needs_begin_frames) | 33 needs_one_begin_frame_ = true; |
32 StartObservingBeginFrames(); | 34 UpdateBeginFrameObservation(); |
33 else | |
34 StopObservingBeginFrames(); | |
35 } | 35 } |
36 | 36 |
37 void BeginFrameObserverProxy::SetCompositor(ui::Compositor* compositor) { | 37 void BeginFrameObserverProxy::SetCompositor(ui::Compositor* compositor) { |
38 DCHECK(!compositor_); | 38 DCHECK(!compositor_); |
39 DCHECK(compositor); | 39 DCHECK(compositor); |
40 | 40 |
41 compositor_ = compositor; | 41 compositor_ = compositor; |
42 compositor_->AddObserver(this); | 42 compositor_->AddObserver(this); |
43 if (needs_begin_frames_) | 43 UpdateBeginFrameObservation(); |
44 StartObservingBeginFrames(); | |
45 } | 44 } |
46 | 45 |
47 void BeginFrameObserverProxy::ResetCompositor() { | 46 void BeginFrameObserverProxy::ResetCompositor() { |
48 if (!compositor_) | 47 if (!compositor_) |
49 return; | 48 return; |
50 compositor_->RemoveObserver(this); | 49 compositor_->RemoveObserver(this); |
51 | 50 StopObservingBeginFrames(); |
52 if (needs_begin_frames_) | |
53 StopObservingBeginFrames(); | |
54 compositor_ = nullptr; | 51 compositor_ = nullptr; |
55 } | 52 } |
56 | 53 |
57 void BeginFrameObserverProxy::OnSendBeginFrame(const cc::BeginFrameArgs& args) { | 54 void BeginFrameObserverProxy::OnSendBeginFrame(const cc::BeginFrameArgs& args) { |
58 if (last_sent_begin_frame_args_.frame_time != args.frame_time) | 55 DCHECK(needs_one_begin_frame_ || needs_begin_frames_); |
| 56 if (last_sent_begin_frame_args_.frame_time != args.frame_time) { |
| 57 // Don't immediately unsubscribe in case BeginFrame dispatch triggers |
| 58 // another request. |
| 59 needs_one_begin_frame_ = false; |
59 client_->SendBeginFrame(args); | 60 client_->SendBeginFrame(args); |
| 61 UpdateBeginFrameObservation(); |
| 62 } |
60 last_sent_begin_frame_args_ = args; | 63 last_sent_begin_frame_args_ = args; |
61 } | 64 } |
62 | 65 |
63 void BeginFrameObserverProxy::OnCompositingShuttingDown( | 66 void BeginFrameObserverProxy::OnCompositingShuttingDown( |
64 ui::Compositor* compositor) { | 67 ui::Compositor* compositor) { |
65 ResetCompositor(); | 68 ResetCompositor(); |
66 } | 69 } |
67 | 70 |
| 71 void BeginFrameObserverProxy::UpdateBeginFrameObservation() { |
| 72 // In some cases, BeginFrame message is requested before |client_|'s window is |
| 73 // added in the root window hierarchy. |
| 74 if (!compositor_) { |
| 75 DCHECK(!observing_begin_frames_); |
| 76 return; |
| 77 } |
| 78 |
| 79 if (needs_begin_frames_ || needs_one_begin_frame_) |
| 80 StartObservingBeginFrames(); |
| 81 else |
| 82 StopObservingBeginFrames(); |
| 83 } |
| 84 |
68 void BeginFrameObserverProxy::StartObservingBeginFrames() { | 85 void BeginFrameObserverProxy::StartObservingBeginFrames() { |
69 DCHECK(compositor_); | 86 DCHECK(compositor_); |
70 compositor_->AddBeginFrameObserver(this); | 87 if (!observing_begin_frames_) { |
| 88 observing_begin_frames_ = true; |
| 89 compositor_->AddBeginFrameObserver(this); |
| 90 } |
71 } | 91 } |
72 | 92 |
73 void BeginFrameObserverProxy::StopObservingBeginFrames() { | 93 void BeginFrameObserverProxy::StopObservingBeginFrames() { |
74 DCHECK(compositor_); | 94 DCHECK(compositor_); |
75 compositor_->RemoveBeginFrameObserver(this); | 95 if (observing_begin_frames_) { |
| 96 observing_begin_frames_ = false; |
| 97 compositor_->RemoveBeginFrameObserver(this); |
| 98 } |
76 } | 99 } |
77 | 100 |
78 } // namespace content | 101 } // namespace content |
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