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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 "cc/surfaces/display_begin_frame_source.h" |
| 6 |
| 7 #include "base/stl_util.h" |
| 8 |
| 9 namespace cc { |
| 10 |
| 11 DisplayBeginFrameSource::DisplayBeginFrameSource( |
| 12 std::unique_ptr<BeginFrameSource> target_source) |
| 13 : target_source_(std::move(target_source)), |
| 14 observing_begin_frames_(false), |
| 15 frame_active_(false), |
| 16 client_(nullptr) {} |
| 17 |
| 18 DisplayBeginFrameSource::~DisplayBeginFrameSource() { |
| 19 if (target_source_ && observing_begin_frames_) |
| 20 target_source_->RemoveObserver(this); |
| 21 } |
| 22 |
| 23 bool DisplayBeginFrameSource::AllObserversFinishedFrame() { |
| 24 if (!frame_active_) |
| 25 return true; |
| 26 return base::STLIncludes(finished_observers_, observers_); |
| 27 } |
| 28 |
| 29 void DisplayBeginFrameSource::SwapTargetSource( |
| 30 std::unique_ptr<BeginFrameSource>* begin_frame_source) { |
| 31 if (client_) |
| 32 client_->BeginFrameSourceSwapping(begin_frame_source->get()); |
| 33 |
| 34 if (target_source_ && observing_begin_frames_) |
| 35 target_source_->RemoveObserver(this); |
| 36 |
| 37 target_source_.swap(*begin_frame_source); |
| 38 |
| 39 if (target_source_ && observing_begin_frames_) |
| 40 target_source_->AddObserver(this); |
| 41 } |
| 42 |
| 43 void DisplayBeginFrameSource::DidFinishFrame(BeginFrameObserver* obs, |
| 44 size_t remaining_frames) { |
| 45 if (!target_source_) |
| 46 return; |
| 47 |
| 48 finished_observers_.insert(obs); |
| 49 ObserverStatusChanged(); |
| 50 } |
| 51 |
| 52 void DisplayBeginFrameSource::AddObserver(BeginFrameObserver* obs) { |
| 53 if (!target_source_) |
| 54 return; |
| 55 |
| 56 observers_.insert(obs); |
| 57 |
| 58 if (!observing_begin_frames_) { |
| 59 observing_begin_frames_ = true; |
| 60 target_source_->AddObserver(this); |
| 61 } |
| 62 |
| 63 ObserverStatusChanged(); |
| 64 } |
| 65 |
| 66 void DisplayBeginFrameSource::RemoveObserver(BeginFrameObserver* obs) { |
| 67 if (!target_source_) |
| 68 return; |
| 69 |
| 70 observers_.erase(obs); |
| 71 finished_observers_.erase(obs); |
| 72 |
| 73 if (observers_.empty()) { |
| 74 DCHECK(observing_begin_frames_); |
| 75 observing_begin_frames_ = false; |
| 76 target_source_->RemoveObserver(this); |
| 77 } |
| 78 |
| 79 ObserverStatusChanged(); |
| 80 } |
| 81 |
| 82 bool DisplayBeginFrameSource::IsThrottled() const { |
| 83 if (target_source_) |
| 84 return target_source_->IsThrottled(); |
| 85 return false; |
| 86 } |
| 87 |
| 88 void DisplayBeginFrameSource::OnBeginFrame(const BeginFrameArgs& args) { |
| 89 // Reset finished observers for the next frame. |
| 90 // TODO(eseckler): Need sequence numbers here to ensure that we don't count |
| 91 // DidFinishFrame() from observers that abort the previous BeginFrame when |
| 92 // this OnBeginFrame() reaches them. |
| 93 finished_observers_.clear(); |
| 94 frame_active_ = true; |
| 95 |
| 96 last_begin_frame_args_ = args; |
| 97 |
| 98 // Observers may remove themselves during OnBeginFrame(), so use a copy. |
| 99 std::set<BeginFrameObserver*> observers = observers_; |
| 100 for (BeginFrameObserver* obs : observers) { |
| 101 obs->OnBeginFrame(args); |
| 102 // TODO(eseckler): Need sequence numbers in args to distinguish emulated |
| 103 // args with equal timestamps. |
| 104 if (obs->LastUsedBeginFrameArgs().frame_time != args.frame_time) |
| 105 finished_observers_.insert(obs); |
| 106 } |
| 107 |
| 108 ObserverStatusChanged(); |
| 109 } |
| 110 |
| 111 const BeginFrameArgs& DisplayBeginFrameSource::LastUsedBeginFrameArgs() const { |
| 112 return last_begin_frame_args_; |
| 113 } |
| 114 |
| 115 void DisplayBeginFrameSource::OnBeginFrameSourcePausedChanged(bool paused) { |
| 116 // BeginFrameSources used as target sources do not make use of this feature. |
| 117 if (paused) |
| 118 NOTIMPLEMENTED(); |
| 119 } |
| 120 |
| 121 void DisplayBeginFrameSource::ObserverStatusChanged() { |
| 122 MaybeFinishFrame(); |
| 123 if (client_) |
| 124 client_->ObserverStatusChanged(); |
| 125 } |
| 126 |
| 127 void DisplayBeginFrameSource::MaybeFinishFrame() { |
| 128 if (!frame_active_ || !AllObserversFinishedFrame()) |
| 129 return; |
| 130 |
| 131 frame_active_ = false; |
| 132 target_source_->DidFinishFrame(this, 0); |
| 133 } |
| 134 |
| 135 } // namespace cc |
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