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1 // Copyright 2017 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 #ifndef CC_SURFACES_PRIMARY_BEGIN_FRAME_SOURCE_H_ | |
6 #define CC_SURFACES_PRIMARY_BEGIN_FRAME_SOURCE_H_ | |
7 | |
8 #include "cc/scheduler/begin_frame_source.h" | |
9 | |
10 namespace cc { | |
11 | |
12 // PrimaryBeginFrameSource echos the first BeginFrameSource in the system. | |
13 // If the first source goes away then it will echo the new first | |
14 // BeginFrameSource. | |
15 class PrimaryBeginFrameSource : public BeginFrameSource, | |
16 public BeginFrameObserver, | |
17 public ExternalBeginFrameSourceClient { | |
18 public: | |
19 PrimaryBeginFrameSource(); | |
20 ~PrimaryBeginFrameSource() override; | |
21 | |
22 void OnBeginFrameSourceAdded(BeginFrameSource* begin_frame_source); | |
23 void OnBeginFrameSourceRemoved(BeginFrameSource* begin_frame_source); | |
24 | |
25 // BeginFrameObserver implementation. | |
26 void OnBeginFrame(const BeginFrameArgs& args) override; | |
27 const BeginFrameArgs& LastUsedBeginFrameArgs() const override; | |
28 void OnBeginFrameSourcePausedChanged(bool paused) override; | |
29 | |
30 // BeginFrameSource implementation. | |
31 void DidFinishFrame(BeginFrameObserver* obs, | |
32 const BeginFrameAck& ack) override; | |
33 void AddObserver(BeginFrameObserver* obs) override; | |
34 void RemoveObserver(BeginFrameObserver* obs) override; | |
35 bool IsThrottled() const override; | |
36 | |
37 // ExternalBeginFrameSourceClient implementation. | |
38 void OnNeedsBeginFrames(bool needs_begin_frames) override; | |
39 | |
40 private: | |
41 ExternalBeginFrameSource begin_frame_source_; | |
42 BeginFrameSource* current_begin_frame_source_ = nullptr; | |
43 | |
44 // The last begin frame args generated by the begin frame source. | |
45 BeginFrameArgs last_begin_frame_args_; | |
46 | |
47 bool needs_begin_frames_ = false; | |
48 | |
49 base::flat_set<BeginFrameSource*> sources_; | |
50 | |
51 DISALLOW_COPY_AND_ASSIGN(PrimaryBeginFrameSource); | |
52 }; | |
53 | |
54 } // namespace cc | |
55 | |
56 #endif // CC_SURFACES_PRIMARY_BEGIN_FRAME_SOURCE_H_ | |
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