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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 "modules/sensor/SensorReadingUpdater.h" | |
| 6 | |
| 7 #include "core/dom/Document.h" | |
| 8 #include "device/generic_sensor/public/interfaces/sensor.mojom-blink.h" | |
| 9 #include "modules/sensor/SensorProxy.h" | |
| 10 #include "platform/wtf/CurrentTime.h" | |
| 11 | |
| 12 using device::mojom::blink::ReportingMode; | |
| 13 | |
| 14 namespace blink { | |
| 15 | |
| 16 SensorReadingUpdater::SensorReadingUpdater(SensorProxy* sensor_proxy) | |
| 17 : sensor_proxy_(sensor_proxy), | |
| 18 document_(sensor_proxy_->GetDocument()), | |
| 19 has_pending_animation_frame_task_(false) {} | |
| 20 | |
| 21 void SensorReadingUpdater::EnqueueAnimationFrameTask() { | |
| 22 if (!document_ || document_->IsDetached()) { | |
| 23 // If the document has detached the scheduled callbacks | |
| 24 // will never be called. | |
| 25 has_pending_animation_frame_task_ = false; | |
| 26 document_ = sensor_proxy_->GetDocument(); | |
| 27 if (!document_ || document_->IsDetached()) | |
| 28 return; | |
| 29 } | |
| 30 | |
| 31 if (has_pending_animation_frame_task_) | |
| 32 return; | |
| 33 | |
| 34 auto callback = WTF::Bind(&SensorReadingUpdater::OnAnimationFrame, | |
| 35 WrapWeakPersistent(this)); | |
| 36 document_->EnqueueAnimationFrameTask(std::move(callback)); | |
| 37 has_pending_animation_frame_task_ = true; | |
| 38 } | |
| 39 | |
| 40 void SensorReadingUpdater::Start() { | |
| 41 EnqueueAnimationFrameTask(); | |
| 42 } | |
| 43 | |
| 44 void SensorReadingUpdater::OnAnimationFrame() { | |
| 45 has_pending_animation_frame_task_ = false; | |
| 46 OnAnimationFrameInternal(); | |
| 47 } | |
| 48 | |
| 49 DEFINE_TRACE(SensorReadingUpdater) { | |
| 50 visitor->Trace(document_); | |
| 51 visitor->Trace(sensor_proxy_); | |
| 52 } | |
| 53 | |
| 54 class SensorReadingUpdaterContinuous : public SensorReadingUpdater { | |
| 55 public: | |
| 56 explicit SensorReadingUpdaterContinuous(SensorProxy* sensor_proxy) | |
| 57 : SensorReadingUpdater(sensor_proxy) {} | |
| 58 | |
| 59 DEFINE_INLINE_VIRTUAL_TRACE() { SensorReadingUpdater::Trace(visitor); } | |
| 60 | |
| 61 protected: | |
| 62 void OnAnimationFrameInternal() override { | |
| 63 if (!sensor_proxy_->IsActive()) | |
| 64 return; | |
| 65 | |
| 66 sensor_proxy_->UpdateSensorReading(); | |
| 67 sensor_proxy_->NotifySensorChanged(WTF::MonotonicallyIncreasingTime()); | |
| 68 EnqueueAnimationFrameTask(); | |
| 69 } | |
| 70 }; | |
| 71 | |
| 72 // New data is fetched from shared buffer only once after 'start()' | |
| 73 // call. Further, notification is send until every client is updated | |
| 74 // (i.e. until longest notification period elapses) rAF stops after that. | |
| 75 class SensorReadingUpdaterOnChange : public SensorReadingUpdater { | |
| 76 public: | |
| 77 explicit SensorReadingUpdaterOnChange(SensorProxy* sensor_proxy) | |
| 78 : SensorReadingUpdater(sensor_proxy), | |
| 79 new_data_arrived_time_(0.0), | |
| 80 new_data_arrived_(false) {} | |
| 81 | |
| 82 DEFINE_INLINE_VIRTUAL_TRACE() { SensorReadingUpdater::Trace(visitor); } | |
| 83 | |
| 84 void Start() override { | |
| 85 new_data_arrived_ = true; | |
| 86 SensorReadingUpdater::Start(); | |
| 87 } | |
| 88 | |
| 89 protected: | |
| 90 void OnAnimationFrameInternal() override { | |
| 91 if (!sensor_proxy_->IsActive()) | |
| 92 return; | |
| 93 | |
| 94 double timestamp = WTF::MonotonicallyIncreasingTime(); | |
| 95 | |
| 96 if (new_data_arrived_) { | |
| 97 new_data_arrived_ = false; | |
| 98 sensor_proxy_->UpdateSensorReading(); | |
| 99 new_data_arrived_time_ = timestamp; | |
| 100 } | |
| 101 sensor_proxy_->NotifySensorChanged(timestamp); | |
| 102 | |
| 103 DCHECK_GT(sensor_proxy_->FrequenciesUsed().front(), 0.0); | |
| 104 double longest_notification_period = | |
| 105 1 / sensor_proxy_->FrequenciesUsed().front(); | |
| 106 | |
| 107 if (timestamp - new_data_arrived_time_ <= longest_notification_period) | |
| 108 EnqueueAnimationFrameTask(); | |
| 109 } | |
| 110 | |
| 111 private: | |
| 112 double new_data_arrived_time_; | |
| 113 bool new_data_arrived_; | |
| 114 }; | |
| 115 | |
| 116 // static | |
| 117 SensorReadingUpdater* SensorReadingUpdater::Create(SensorProxy* proxy, | |
| 118 ReportingMode mode) { | |
| 119 if (mode == ReportingMode::CONTINUOUS) | |
| 120 return new SensorReadingUpdaterContinuous(proxy); | |
| 121 return new SensorReadingUpdaterOnChange(proxy); | |
| 122 } | |
| 123 | |
| 124 } // namespace blink | |
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Chromium Code Reviews
Issue 2870073002:
[Sensors] Decouple sensor readings update from rAF (Closed)
