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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 #ifndef CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |
| 6 #define CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |
| 7 |
| 8 #include <memory> |
| 9 #include <set> |
| 10 |
| 11 #include "base/macros.h" |
| 12 #include "cc/scheduler/begin_frame_source.h" |
| 13 |
| 14 namespace cc { |
| 15 |
| 16 class DisplayBeginFrameSourceClient { |
| 17 public: |
| 18 virtual void ObserverStatusChanged() = 0; |
| 19 virtual void BeginFrameSourceSwapping(BeginFrameSource* new_source) = 0; |
| 20 }; |
| 21 |
| 22 // Wraps a target BeginFrameSource and keeps track of observers that have |
| 23 // finished a BeginFrame. Supports swapping the target source underneath it. |
| 24 class DisplayBeginFrameSource : public BeginFrameSource, |
| 25 public BeginFrameObserver { |
| 26 public: |
| 27 explicit DisplayBeginFrameSource( |
| 28 std::unique_ptr<BeginFrameSource> target_source); |
| 29 ~DisplayBeginFrameSource() override; |
| 30 |
| 31 BeginFrameSource* GetTargetSource() { return target_source_.get(); } |
| 32 void SetClient(DisplayBeginFrameSourceClient* client) { client_ = client; } |
| 33 |
| 34 bool AllObserversFinishedFrame(); |
| 35 |
| 36 void SwapTargetSource(std::unique_ptr<BeginFrameSource>* begin_frame_source); |
| 37 |
| 38 // BeginFrameSource implementation. |
| 39 void DidFinishFrame(BeginFrameObserver* obs, |
| 40 size_t remaining_frames) override; |
| 41 void AddObserver(BeginFrameObserver* obs) override; |
| 42 void RemoveObserver(BeginFrameObserver* obs) override; |
| 43 bool IsThrottled() const override; |
| 44 |
| 45 // BeginFrameObserver implementation. |
| 46 void OnBeginFrame(const BeginFrameArgs& args) override; |
| 47 const BeginFrameArgs& LastUsedBeginFrameArgs() const override; |
| 48 void OnBeginFrameSourcePausedChanged(bool paused) override; |
| 49 |
| 50 private: |
| 51 void ObserverStatusChanged(); |
| 52 void MaybeFinishFrame(); |
| 53 |
| 54 std::unique_ptr<BeginFrameSource> target_source_; |
| 55 std::set<BeginFrameObserver*> observers_; |
| 56 std::set<BeginFrameObserver*> finished_observers_; |
| 57 BeginFrameArgs last_begin_frame_args_; |
| 58 bool observing_begin_frames_; |
| 59 bool frame_active_; |
| 60 |
| 61 DisplayBeginFrameSourceClient* client_; // Not owned. |
| 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(DisplayBeginFrameSource); |
| 64 }; |
| 65 |
| 66 } // namespace cc |
| 67 |
| 68 #endif // CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |
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