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| 1 // Copyright 2014 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 "content/browser/device_sensors/data_fetcher_shared_memory.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/metrics/histogram_macros.h" | |
| 11 #include "base/single_thread_task_runner.h" | |
| 12 #include "content/browser/device_sensors/ambient_light_mac.h" | |
| 13 #include "device/sensors/public/cpp/device_util_mac.h" | |
| 14 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | |
| 15 | |
| 16 namespace { | |
| 17 | |
| 18 const double kMeanGravity = 9.80665; | |
| 19 | |
| 20 void FetchLight(content::AmbientLightSensor* sensor, | |
| 21 content::DeviceLightHardwareBuffer* buffer) { | |
| 22 DCHECK(sensor); | |
| 23 DCHECK(buffer); | |
| 24 // Macbook pro has 2 lux values, left and right, we take the average. | |
| 25 // The raw sensor values are converted to lux using LMUvalueToLux(raw_value) | |
| 26 // similar to how it is done in Firefox. | |
| 27 uint64_t lux_value[2]; | |
| 28 if (!sensor->ReadSensorValue(lux_value)) | |
| 29 return; | |
| 30 uint64_t mean = (lux_value[0] + lux_value[1]) / 2; | |
| 31 double lux = device::LMUvalueToLux(mean); | |
| 32 buffer->seqlock.WriteBegin(); | |
| 33 buffer->data.value = lux; | |
| 34 buffer->seqlock.WriteEnd(); | |
| 35 } | |
| 36 | |
| 37 void FetchMotion(SuddenMotionSensor* sensor, | |
| 38 content::DeviceMotionHardwareBuffer* buffer) { | |
| 39 DCHECK(sensor); | |
| 40 DCHECK(buffer); | |
| 41 | |
| 42 float axis_value[3]; | |
| 43 if (!sensor->ReadSensorValues(axis_value)) | |
| 44 return; | |
| 45 | |
| 46 buffer->seqlock.WriteBegin(); | |
| 47 buffer->data.accelerationIncludingGravityX = axis_value[0] * kMeanGravity; | |
| 48 buffer->data.hasAccelerationIncludingGravityX = true; | |
| 49 buffer->data.accelerationIncludingGravityY = axis_value[1] * kMeanGravity; | |
| 50 buffer->data.hasAccelerationIncludingGravityY = true; | |
| 51 buffer->data.accelerationIncludingGravityZ = axis_value[2] * kMeanGravity; | |
| 52 buffer->data.hasAccelerationIncludingGravityZ = true; | |
| 53 buffer->data.allAvailableSensorsAreActive = true; | |
| 54 buffer->seqlock.WriteEnd(); | |
| 55 } | |
| 56 | |
| 57 void FetchOrientation(SuddenMotionSensor* sensor, | |
| 58 content::DeviceOrientationHardwareBuffer* buffer) { | |
| 59 DCHECK(sensor); | |
| 60 DCHECK(buffer); | |
| 61 | |
| 62 // Retrieve per-axis calibrated values. | |
| 63 float axis_value[3]; | |
| 64 if (!sensor->ReadSensorValues(axis_value)) | |
| 65 return; | |
| 66 | |
| 67 // Transform the accelerometer values to W3C draft angles. | |
| 68 // | |
| 69 // Accelerometer values are just dot products of the sensor axes | |
| 70 // by the gravity vector 'g' with the result for the z axis inverted. | |
| 71 // | |
| 72 // To understand this transformation calculate the 3rd row of the z-x-y | |
| 73 // Euler angles rotation matrix (because of the 'g' vector, only 3rd row | |
| 74 // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz. | |
| 75 // Then, assume alpha = 0 and you get this: | |
| 76 // | |
| 77 // x_acc = sin(gamma) | |
| 78 // y_acc = - cos(gamma) * sin(beta) | |
| 79 // z_acc = cos(beta) * cos(gamma) | |
| 80 // | |
| 81 // After that the rest is just a bit of trigonometry. | |
| 82 // | |
| 83 // Also note that alpha can't be provided but it's assumed to be always zero. | |
| 84 // This is necessary in order to provide enough information to solve | |
| 85 // the equations. | |
| 86 // | |
| 87 const double kRad2deg = 180.0 / M_PI; | |
| 88 double beta = kRad2deg * atan2(-axis_value[1], axis_value[2]); | |
| 89 double gamma = kRad2deg * asin(axis_value[0]); | |
| 90 | |
| 91 // Make sure that the interval boundaries comply with the specification. At | |
| 92 // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has | |
| 93 // the upper bound open on both. | |
| 94 if (beta == 180.0) | |
| 95 beta = -180; // -180 == 180 (upside-down) | |
| 96 if (gamma == 90.0) | |
| 97 gamma = nextafter(90, 0); | |
| 98 | |
| 99 // At this point, DCHECKing is paranoia. Never hurts. | |
| 100 DCHECK_GE(beta, -180.0); | |
| 101 DCHECK_LT(beta, 180.0); | |
| 102 DCHECK_GE(gamma, -90.0); | |
| 103 DCHECK_LT(gamma, 90.0); | |
| 104 | |
| 105 buffer->seqlock.WriteBegin(); | |
| 106 buffer->data.beta = beta; | |
| 107 buffer->data.hasBeta = true; | |
| 108 buffer->data.gamma = gamma; | |
| 109 buffer->data.hasGamma = true; | |
| 110 buffer->data.allAvailableSensorsAreActive = true; | |
| 111 buffer->seqlock.WriteEnd(); | |
| 112 } | |
| 113 | |
| 114 } // namespace | |
| 115 | |
| 116 namespace content { | |
| 117 | |
| 118 DataFetcherSharedMemory::DataFetcherSharedMemory() { | |
| 119 } | |
| 120 | |
| 121 DataFetcherSharedMemory::~DataFetcherSharedMemory() { | |
| 122 } | |
| 123 | |
| 124 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) { | |
| 125 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 126 DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION || | |
| 127 consumer_bitmask & CONSUMER_TYPE_MOTION || | |
| 128 consumer_bitmask & CONSUMER_TYPE_LIGHT); | |
| 129 | |
| 130 if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION) | |
| 131 FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_); | |
| 132 if (consumer_bitmask & CONSUMER_TYPE_MOTION) | |
| 133 FetchMotion(sudden_motion_sensor_.get(), motion_buffer_); | |
| 134 if (consumer_bitmask & CONSUMER_TYPE_LIGHT) | |
| 135 FetchLight(ambient_light_sensor_.get(), light_buffer_); | |
| 136 } | |
| 137 | |
| 138 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const { | |
| 139 return FETCHER_TYPE_POLLING_CALLBACK; | |
| 140 } | |
| 141 | |
| 142 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
| 143 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 144 DCHECK(buffer); | |
| 145 | |
| 146 switch (consumer_type) { | |
| 147 case CONSUMER_TYPE_MOTION: { | |
| 148 if (!sudden_motion_sensor_) | |
| 149 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 150 bool sudden_motion_sensor_available = | |
| 151 sudden_motion_sensor_.get() != nullptr; | |
| 152 | |
| 153 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
| 154 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionMacAvailable", | |
| 155 sudden_motion_sensor_available); | |
| 156 if (!sudden_motion_sensor_available) { | |
| 157 // No motion sensor available, fire an all-null event. | |
| 158 motion_buffer_->seqlock.WriteBegin(); | |
| 159 motion_buffer_->data.allAvailableSensorsAreActive = true; | |
| 160 motion_buffer_->seqlock.WriteEnd(); | |
| 161 } | |
| 162 return sudden_motion_sensor_available; | |
| 163 } | |
| 164 case CONSUMER_TYPE_ORIENTATION: { | |
| 165 if (!sudden_motion_sensor_) | |
| 166 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 167 bool sudden_motion_sensor_available = | |
| 168 sudden_motion_sensor_.get() != nullptr; | |
| 169 | |
| 170 orientation_buffer_ = | |
| 171 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 172 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable", | |
| 173 sudden_motion_sensor_available); | |
| 174 if (sudden_motion_sensor_available) { | |
| 175 // On Mac we cannot provide absolute orientation. | |
| 176 orientation_buffer_->seqlock.WriteBegin(); | |
| 177 orientation_buffer_->data.absolute = false; | |
| 178 orientation_buffer_->seqlock.WriteEnd(); | |
| 179 } else { | |
| 180 // No motion sensor available, fire an all-null event. | |
| 181 orientation_buffer_->seqlock.WriteBegin(); | |
| 182 orientation_buffer_->data.allAvailableSensorsAreActive = true; | |
| 183 orientation_buffer_->seqlock.WriteEnd(); | |
| 184 } | |
| 185 return sudden_motion_sensor_available; | |
| 186 } | |
| 187 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: { | |
| 188 orientation_absolute_buffer_ = | |
| 189 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 190 // Absolute device orientation not available on Mac, let the | |
| 191 // implementation fire an all-null event to signal this to blink. | |
| 192 orientation_absolute_buffer_->seqlock.WriteBegin(); | |
| 193 orientation_absolute_buffer_->data.absolute = true; | |
| 194 orientation_absolute_buffer_->data.allAvailableSensorsAreActive = true; | |
| 195 orientation_absolute_buffer_->seqlock.WriteEnd(); | |
| 196 return false; | |
| 197 } | |
| 198 case CONSUMER_TYPE_LIGHT: { | |
| 199 if (!ambient_light_sensor_) | |
| 200 ambient_light_sensor_ = AmbientLightSensor::Create(); | |
| 201 bool ambient_light_sensor_available = | |
| 202 ambient_light_sensor_.get() != nullptr; | |
| 203 | |
| 204 light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer); | |
| 205 if (!ambient_light_sensor_available) { | |
| 206 light_buffer_->seqlock.WriteBegin(); | |
| 207 light_buffer_->data.value = std::numeric_limits<double>::infinity(); | |
| 208 light_buffer_->seqlock.WriteEnd(); | |
| 209 } | |
| 210 return ambient_light_sensor_available; | |
| 211 } | |
| 212 default: | |
| 213 NOTREACHED(); | |
| 214 } | |
| 215 return false; | |
| 216 } | |
| 217 | |
| 218 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
| 219 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 220 | |
| 221 switch (consumer_type) { | |
| 222 case CONSUMER_TYPE_MOTION: | |
| 223 if (motion_buffer_) { | |
| 224 motion_buffer_->seqlock.WriteBegin(); | |
| 225 motion_buffer_->data.allAvailableSensorsAreActive = false; | |
| 226 motion_buffer_->seqlock.WriteEnd(); | |
| 227 motion_buffer_ = nullptr; | |
| 228 } | |
| 229 return true; | |
| 230 case CONSUMER_TYPE_ORIENTATION: | |
| 231 if (orientation_buffer_) { | |
| 232 orientation_buffer_->seqlock.WriteBegin(); | |
| 233 orientation_buffer_->data.allAvailableSensorsAreActive = false; | |
| 234 orientation_buffer_->seqlock.WriteEnd(); | |
| 235 orientation_buffer_ = nullptr; | |
| 236 } | |
| 237 return true; | |
| 238 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
| 239 if (orientation_absolute_buffer_) { | |
| 240 orientation_absolute_buffer_->seqlock.WriteBegin(); | |
| 241 orientation_absolute_buffer_->data.allAvailableSensorsAreActive = false; | |
| 242 orientation_absolute_buffer_->seqlock.WriteEnd(); | |
| 243 orientation_absolute_buffer_ = nullptr; | |
| 244 } | |
| 245 return true; | |
| 246 case CONSUMER_TYPE_LIGHT: | |
| 247 if (light_buffer_) { | |
| 248 light_buffer_->seqlock.WriteBegin(); | |
| 249 light_buffer_->data.value = -1; | |
| 250 light_buffer_->seqlock.WriteEnd(); | |
| 251 light_buffer_ = nullptr; | |
| 252 } | |
| 253 return true; | |
| 254 default: | |
| 255 NOTREACHED(); | |
| 256 } | |
| 257 return false; | |
| 258 } | |
| 259 | |
| 260 } // namespace content | |
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Chromium Code Reviews
Issue 2646093002:
Move //content/browser/device_sensor/ into device/sensors (Closed)
