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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 "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 "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | |
| 13 | |
| 14 namespace device { | |
| 15 | |
| 16 const double kMeanGravity = 9.80665; | |
| 17 | |
| 18 void FetchMotion(SuddenMotionSensor* sensor, | |
| 19 DeviceMotionHardwareBuffer* buffer) { | |
| 20 DCHECK(sensor); | |
| 21 DCHECK(buffer); | |
| 22 | |
| 23 float axis_value[3]; | |
| 24 if (!sensor->ReadSensorValues(axis_value)) | |
| 25 return; | |
| 26 | |
| 27 buffer->seqlock.WriteBegin(); | |
| 28 buffer->data.acceleration_including_gravity_x = axis_value[0] * kMeanGravity; | |
| 29 buffer->data.has_acceleration_including_gravity_x = true; | |
| 30 buffer->data.acceleration_including_gravity_y = axis_value[1] * kMeanGravity; | |
| 31 buffer->data.has_acceleration_including_gravity_y = true; | |
| 32 buffer->data.acceleration_including_gravity_z = axis_value[2] * kMeanGravity; | |
| 33 buffer->data.has_acceleration_including_gravity_z = true; | |
| 34 buffer->data.all_available_sensors_are_active = true; | |
| 35 buffer->seqlock.WriteEnd(); | |
| 36 } | |
| 37 | |
| 38 void FetchOrientation(SuddenMotionSensor* sensor, | |
| 39 DeviceOrientationHardwareBuffer* buffer) { | |
| 40 DCHECK(sensor); | |
| 41 DCHECK(buffer); | |
| 42 | |
| 43 // Retrieve per-axis calibrated values. | |
| 44 float axis_value[3]; | |
| 45 if (!sensor->ReadSensorValues(axis_value)) | |
| 46 return; | |
| 47 | |
| 48 // Transform the accelerometer values to W3C draft angles. | |
| 49 // | |
| 50 // Accelerometer values are just dot products of the sensor axes | |
| 51 // by the gravity vector 'g' with the result for the z axis inverted. | |
| 52 // | |
| 53 // To understand this transformation calculate the 3rd row of the z-x-y | |
| 54 // Euler angles rotation matrix (because of the 'g' vector, only 3rd row | |
| 55 // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz. | |
| 56 // Then, assume alpha = 0 and you get this: | |
| 57 // | |
| 58 // x_acc = sin(gamma) | |
| 59 // y_acc = - cos(gamma) * sin(beta) | |
| 60 // z_acc = cos(beta) * cos(gamma) | |
| 61 // | |
| 62 // After that the rest is just a bit of trigonometry. | |
| 63 // | |
| 64 // Also note that alpha can't be provided but it's assumed to be always zero. | |
| 65 // This is necessary in order to provide enough information to solve | |
| 66 // the equations. | |
| 67 // | |
| 68 const double kRad2deg = 180.0 / M_PI; | |
| 69 double beta = kRad2deg * atan2(-axis_value[1], axis_value[2]); | |
| 70 double gamma = kRad2deg * asin(axis_value[0]); | |
| 71 | |
| 72 // Make sure that the interval boundaries comply with the specification. At | |
| 73 // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has | |
| 74 // the upper bound open on both. | |
| 75 if (beta == 180.0) | |
| 76 beta = -180; // -180 == 180 (upside-down) | |
| 77 if (gamma == 90.0) | |
| 78 gamma = nextafter(90, 0); | |
| 79 | |
| 80 // At this point, DCHECKing is paranoia. Never hurts. | |
| 81 DCHECK_GE(beta, -180.0); | |
| 82 DCHECK_LT(beta, 180.0); | |
| 83 DCHECK_GE(gamma, -90.0); | |
| 84 DCHECK_LT(gamma, 90.0); | |
| 85 | |
| 86 buffer->seqlock.WriteBegin(); | |
| 87 buffer->data.beta = beta; | |
| 88 buffer->data.has_beta = true; | |
| 89 buffer->data.gamma = gamma; | |
| 90 buffer->data.has_gamma = true; | |
| 91 buffer->data.all_available_sensors_are_active = true; | |
| 92 buffer->seqlock.WriteEnd(); | |
| 93 } | |
| 94 | |
| 95 DataFetcherSharedMemory::DataFetcherSharedMemory() {} | |
| 96 | |
| 97 DataFetcherSharedMemory::~DataFetcherSharedMemory() {} | |
| 98 | |
| 99 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) { | |
| 100 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 101 DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION || | |
| 102 consumer_bitmask & CONSUMER_TYPE_MOTION); | |
| 103 | |
| 104 if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION) | |
| 105 FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_); | |
| 106 if (consumer_bitmask & CONSUMER_TYPE_MOTION) | |
| 107 FetchMotion(sudden_motion_sensor_.get(), motion_buffer_); | |
| 108 } | |
| 109 | |
| 110 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const { | |
| 111 return FETCHER_TYPE_POLLING_CALLBACK; | |
| 112 } | |
| 113 | |
| 114 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
| 115 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 116 DCHECK(buffer); | |
| 117 | |
| 118 switch (consumer_type) { | |
| 119 case CONSUMER_TYPE_MOTION: { | |
| 120 if (!sudden_motion_sensor_) | |
| 121 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 122 bool sudden_motion_sensor_available = | |
| 123 sudden_motion_sensor_.get() != nullptr; | |
| 124 | |
| 125 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
| 126 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionMacAvailable", | |
| 127 sudden_motion_sensor_available); | |
| 128 if (!sudden_motion_sensor_available) { | |
| 129 // No motion sensor available, fire an all-null event. | |
| 130 motion_buffer_->seqlock.WriteBegin(); | |
| 131 motion_buffer_->data.all_available_sensors_are_active = true; | |
| 132 motion_buffer_->seqlock.WriteEnd(); | |
| 133 } | |
| 134 return sudden_motion_sensor_available; | |
| 135 } | |
| 136 case CONSUMER_TYPE_ORIENTATION: { | |
| 137 if (!sudden_motion_sensor_) | |
| 138 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 139 bool sudden_motion_sensor_available = | |
| 140 sudden_motion_sensor_.get() != nullptr; | |
| 141 | |
| 142 orientation_buffer_ = | |
| 143 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 144 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable", | |
| 145 sudden_motion_sensor_available); | |
| 146 if (sudden_motion_sensor_available) { | |
| 147 // On Mac we cannot provide absolute orientation. | |
| 148 orientation_buffer_->seqlock.WriteBegin(); | |
| 149 orientation_buffer_->data.absolute = false; | |
| 150 orientation_buffer_->seqlock.WriteEnd(); | |
| 151 } else { | |
| 152 // No motion sensor available, fire an all-null event. | |
| 153 orientation_buffer_->seqlock.WriteBegin(); | |
| 154 orientation_buffer_->data.all_available_sensors_are_active = true; | |
| 155 orientation_buffer_->seqlock.WriteEnd(); | |
| 156 } | |
| 157 return sudden_motion_sensor_available; | |
| 158 } | |
| 159 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: { | |
| 160 orientation_absolute_buffer_ = | |
| 161 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 162 // Absolute device orientation not available on Mac, let the | |
| 163 // implementation fire an all-null event to signal this to blink. | |
| 164 orientation_absolute_buffer_->seqlock.WriteBegin(); | |
| 165 orientation_absolute_buffer_->data.absolute = true; | |
| 166 orientation_absolute_buffer_->data.all_available_sensors_are_active = | |
| 167 true; | |
| 168 orientation_absolute_buffer_->seqlock.WriteEnd(); | |
| 169 return false; | |
| 170 } | |
| 171 default: | |
| 172 NOTREACHED(); | |
| 173 } | |
| 174 return false; | |
| 175 } | |
| 176 | |
| 177 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
| 178 DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread()); | |
| 179 | |
| 180 switch (consumer_type) { | |
| 181 case CONSUMER_TYPE_MOTION: | |
| 182 if (motion_buffer_) { | |
| 183 motion_buffer_->seqlock.WriteBegin(); | |
| 184 motion_buffer_->data.all_available_sensors_are_active = false; | |
| 185 motion_buffer_->seqlock.WriteEnd(); | |
| 186 motion_buffer_ = nullptr; | |
| 187 } | |
| 188 return true; | |
| 189 case CONSUMER_TYPE_ORIENTATION: | |
| 190 if (orientation_buffer_) { | |
| 191 orientation_buffer_->seqlock.WriteBegin(); | |
| 192 orientation_buffer_->data.all_available_sensors_are_active = false; | |
| 193 orientation_buffer_->seqlock.WriteEnd(); | |
| 194 orientation_buffer_ = nullptr; | |
| 195 } | |
| 196 return true; | |
| 197 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
| 198 if (orientation_absolute_buffer_) { | |
| 199 orientation_absolute_buffer_->seqlock.WriteBegin(); | |
| 200 orientation_absolute_buffer_->data.all_available_sensors_are_active = | |
| 201 false; | |
| 202 orientation_absolute_buffer_->seqlock.WriteEnd(); | |
| 203 orientation_absolute_buffer_ = nullptr; | |
| 204 } | |
| 205 return true; | |
| 206 default: | |
| 207 NOTREACHED(); | |
| 208 } | |
| 209 return false; | |
| 210 } | |
| 211 | |
| 212 } // namespace device | |
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Chromium Code Reviews
Issue 2885203004:
Refactor content/renderer/device_sensors to use device/generic_sensor instead of device/sensors (Closed)
