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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 <algorithm> |
| 8 |
| 9 namespace cc { |
| 10 |
| 11 DisplayBeginFrameSource::DisplayBeginFrameSource( |
| 12 std::unique_ptr<BeginFrameSource> wrapped_source) |
| 13 : wrapped_source_(std::move(wrapped_source)), |
| 14 observing_begin_frames_(false), |
| 15 frame_active_(false), |
| 16 latest_confirmed_frame_(BeginFrameArgs::kInvalidFrameNumber), |
| 17 client_(nullptr), |
| 18 client_needs_begin_frames_(false) {} |
| 19 |
| 20 DisplayBeginFrameSource::~DisplayBeginFrameSource() { |
| 21 if (wrapped_source_ && observing_begin_frames_) |
| 22 wrapped_source_->RemoveObserver(this); |
| 23 } |
| 24 |
| 25 void DisplayBeginFrameSource::SetClient(DisplayBeginFrameSourceClient* client) { |
| 26 client_ = client; |
| 27 ObserverStatusChanged(); |
| 28 } |
| 29 |
| 30 void DisplayBeginFrameSource::SetClientNeedsBeginFrames( |
| 31 bool needs_begin_frames) { |
| 32 DCHECK(client_); |
| 33 |
| 34 if (client_needs_begin_frames_ == needs_begin_frames) |
| 35 return; |
| 36 client_needs_begin_frames_ = needs_begin_frames; |
| 37 |
| 38 if (client_needs_begin_frames_ && observing_begin_frames_) { |
| 39 // We were already observing, but the client may have missed the last |
| 40 // BeginFrame. |
| 41 BeginFrameArgs missed_args = |
| 42 GetMissedArgs(client_->LastUsedBeginFrameArgs()); |
| 43 if (missed_args.IsValid()) |
| 44 client_->OnBeginFrame(missed_args); |
| 45 } |
| 46 |
| 47 UpdateObservingBeginFrames(); |
| 48 } |
| 49 |
| 50 void DisplayBeginFrameSource::FinishClientFrame(bool had_damage, |
| 51 bool has_pending_updates) { |
| 52 DCHECK(frame_active_); |
| 53 frame_active_ = false; |
| 54 |
| 55 // Only update the |latest_confirmed_frame_| if there are no further pending |
| 56 // updates (i.e. the Display didn't have to draw or drew successfully). |
| 57 if (!has_pending_updates) |
| 58 latest_confirmed_frame_ = ack_tracker_.LatestConfirmedFrame(); |
| 59 |
| 60 BeginFrameAck ack(current_begin_frame_args_.source_id, |
| 61 current_begin_frame_args_.sequence_number, |
| 62 latest_confirmed_frame_, 0, had_damage); |
| 63 if (wrapped_source_) |
| 64 wrapped_source_->DidFinishFrame(this, ack); |
| 65 } |
| 66 |
| 67 bool DisplayBeginFrameSource::HasObservers() const { |
| 68 return !observers_.empty(); |
| 69 } |
| 70 |
| 71 bool DisplayBeginFrameSource::AllObserversFinishedFrame() const { |
| 72 return ack_tracker_.AllObserversFinishedFrame(); |
| 73 } |
| 74 |
| 75 void DisplayBeginFrameSource::SwapWrappedSource( |
| 76 std::unique_ptr<BeginFrameSource>* begin_frame_source) { |
| 77 if (wrapped_source_ && observing_begin_frames_) |
| 78 wrapped_source_->RemoveObserver(this); |
| 79 |
| 80 wrapped_source_.swap(*begin_frame_source); |
| 81 |
| 82 if (wrapped_source_ && observing_begin_frames_) |
| 83 wrapped_source_->AddObserver(this); |
| 84 } |
| 85 |
| 86 uint64_t DisplayBeginFrameSource::CurrentSourceId() { |
| 87 return current_begin_frame_args_.source_id; |
| 88 } |
| 89 |
| 90 uint64_t DisplayBeginFrameSource::CurrentFrameNumber() { |
| 91 return current_begin_frame_args_.sequence_number; |
| 92 } |
| 93 |
| 94 uint64_t DisplayBeginFrameSource::LatestConfirmedFrame() { |
| 95 return ack_tracker_.LatestConfirmedFrame(); |
| 96 } |
| 97 |
| 98 void DisplayBeginFrameSource::DidFinishFrame(BeginFrameObserver* obs, |
| 99 const BeginFrameAck& ack) { |
| 100 ack_tracker_.OnObserverFinishedFrame(obs, ack); |
| 101 ObserverStatusChanged(); |
| 102 } |
| 103 |
| 104 void DisplayBeginFrameSource::AddObserver(BeginFrameObserver* obs) { |
| 105 observers_.insert(obs); |
| 106 ack_tracker_.OnObserverAdded(obs); |
| 107 |
| 108 ObserverStatusChanged(); |
| 109 |
| 110 if (observing_begin_frames_) { |
| 111 // We were already observing, but the observer may have missed the last |
| 112 // BeginFrame. |
| 113 BeginFrameArgs missed_args = GetMissedArgs(obs->LastUsedBeginFrameArgs()); |
| 114 if (missed_args.IsValid()) { |
| 115 obs->OnBeginFrame(missed_args); |
| 116 ack_tracker_.OnObserverBeginFrame(obs, missed_args); |
| 117 } |
| 118 } |
| 119 |
| 120 UpdateObservingBeginFrames(); |
| 121 } |
| 122 |
| 123 void DisplayBeginFrameSource::RemoveObserver(BeginFrameObserver* obs) { |
| 124 observers_.erase(obs); |
| 125 ack_tracker_.OnObserverRemoved(obs); |
| 126 |
| 127 ObserverStatusChanged(); |
| 128 UpdateObservingBeginFrames(); |
| 129 } |
| 130 |
| 131 bool DisplayBeginFrameSource::IsThrottled() const { |
| 132 if (wrapped_source_) |
| 133 return wrapped_source_->IsThrottled(); |
| 134 return true; |
| 135 } |
| 136 |
| 137 void DisplayBeginFrameSource::OnBeginFrame(const BeginFrameArgs& args) { |
| 138 if (client_ && client_needs_begin_frames_) |
| 139 client_->OnBeginFrame(args); |
| 140 |
| 141 // Reset for the new frame. |
| 142 frame_active_ = true; |
| 143 ack_tracker_.OnBeginFrame(args); |
| 144 |
| 145 // BeginFrameObserverAckTracker will have updated the latest confirmed frame |
| 146 // if the wrapped source changes. |
| 147 if (args.source_id != current_begin_frame_args_.source_id) |
| 148 latest_confirmed_frame_ = ack_tracker_.LatestConfirmedFrame(); |
| 149 |
| 150 current_begin_frame_args_ = args; |
| 151 |
| 152 // Observers may remove themselves during OnBeginFrame(), so use a copy. |
| 153 std::set<BeginFrameObserver*> observers = observers_; |
| 154 for (BeginFrameObserver* obs : observers) { |
| 155 obs->OnBeginFrame(args); |
| 156 ack_tracker_.OnObserverBeginFrame(obs, args); |
| 157 } |
| 158 |
| 159 ObserverStatusChanged(); |
| 160 } |
| 161 |
| 162 const BeginFrameArgs& DisplayBeginFrameSource::LastUsedBeginFrameArgs() const { |
| 163 return current_begin_frame_args_; |
| 164 } |
| 165 |
| 166 void DisplayBeginFrameSource::OnBeginFrameSourcePausedChanged(bool paused) { |
| 167 // BeginFrameSources used as wrapped sources do not make use of this feature. |
| 168 DCHECK(!paused); |
| 169 } |
| 170 |
| 171 void DisplayBeginFrameSource::UpdateObservingBeginFrames() { |
| 172 bool should_observe = client_needs_begin_frames_ || !observers_.empty(); |
| 173 if (should_observe == observing_begin_frames_) |
| 174 return; |
| 175 |
| 176 observing_begin_frames_ = should_observe; |
| 177 |
| 178 if (!wrapped_source_) |
| 179 return; |
| 180 |
| 181 if (observing_begin_frames_) { |
| 182 // We need to start observing, a missed BeginFrame will be triggered by |
| 183 // the wrapped source and forwarded to the client or observer. |
| 184 wrapped_source_->AddObserver(this); |
| 185 } else { |
| 186 wrapped_source_->RemoveObserver(this); |
| 187 } |
| 188 } |
| 189 |
| 190 BeginFrameArgs DisplayBeginFrameSource::GetMissedArgs( |
| 191 const BeginFrameArgs& last_args) const { |
| 192 if (!current_begin_frame_args_.IsValid() || !wrapped_source_ || |
| 193 !frame_active_) |
| 194 return BeginFrameArgs(); |
| 195 |
| 196 if (last_args.IsValid() && |
| 197 (last_args.sequence_number >= current_begin_frame_args_.sequence_number)) |
| 198 return BeginFrameArgs(); |
| 199 |
| 200 BeginFrameArgs missed_args = current_begin_frame_args_; |
| 201 missed_args.type = BeginFrameArgs::MISSED; |
| 202 return missed_args; |
| 203 } |
| 204 |
| 205 void DisplayBeginFrameSource::ObserverStatusChanged() { |
| 206 if (client_) |
| 207 client_->BeginFrameObserverStatusChanged(); |
| 208 } |
| 209 |
| 210 } // namespace cc |
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