| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright 2013 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 "data_fetcher_shared_memory.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/metrics/histogram.h" | |
| 9 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | |
| 10 | |
| 11 namespace { | |
| 12 | |
| 13 const double kMeanGravity = 9.80665; | |
| 14 | |
| 15 void FetchMotion(SuddenMotionSensor* sensor, | |
| 16 content::DeviceMotionHardwareBuffer* buffer) { | |
| 17 DCHECK(buffer); | |
| 18 | |
| 19 float axis_value[3]; | |
| 20 if (!sensor->ReadSensorValues(axis_value)) | |
| 21 return; | |
| 22 | |
| 23 buffer->seqlock.WriteBegin(); | |
| 24 buffer->data.accelerationIncludingGravityX = axis_value[0] * kMeanGravity; | |
| 25 buffer->data.hasAccelerationIncludingGravityX = true; | |
| 26 buffer->data.accelerationIncludingGravityY = axis_value[1] * kMeanGravity; | |
| 27 buffer->data.hasAccelerationIncludingGravityY = true; | |
| 28 buffer->data.accelerationIncludingGravityZ = axis_value[2] * kMeanGravity; | |
| 29 buffer->data.hasAccelerationIncludingGravityZ = true; | |
| 30 buffer->data.allAvailableSensorsAreActive = true; | |
| 31 buffer->seqlock.WriteEnd(); | |
| 32 } | |
| 33 | |
| 34 void FetchOrientation(SuddenMotionSensor* sensor, | |
| 35 content::DeviceOrientationHardwareBuffer* buffer) { | |
| 36 DCHECK(buffer); | |
| 37 | |
| 38 // Retrieve per-axis calibrated values. | |
| 39 float axis_value[3]; | |
| 40 if (!sensor->ReadSensorValues(axis_value)) | |
| 41 return; | |
| 42 | |
| 43 // Transform the accelerometer values to W3C draft angles. | |
| 44 // | |
| 45 // Accelerometer values are just dot products of the sensor axes | |
| 46 // by the gravity vector 'g' with the result for the z axis inverted. | |
| 47 // | |
| 48 // To understand this transformation calculate the 3rd row of the z-x-y | |
| 49 // Euler angles rotation matrix (because of the 'g' vector, only 3rd row | |
| 50 // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz. | |
| 51 // Then, assume alpha = 0 and you get this: | |
| 52 // | |
| 53 // x_acc = sin(gamma) | |
| 54 // y_acc = - cos(gamma) * sin(beta) | |
| 55 // z_acc = cos(beta) * cos(gamma) | |
| 56 // | |
| 57 // After that the rest is just a bit of trigonometry. | |
| 58 // | |
| 59 // Also note that alpha can't be provided but it's assumed to be always zero. | |
| 60 // This is necessary in order to provide enough information to solve | |
| 61 // the equations. | |
| 62 // | |
| 63 const double kRad2deg = 180.0 / M_PI; | |
| 64 double beta = kRad2deg * atan2(-axis_value[1], axis_value[2]); | |
| 65 double gamma = kRad2deg * asin(axis_value[0]); | |
| 66 | |
| 67 // Make sure that the interval boundaries comply with the specification. At | |
| 68 // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has | |
| 69 // the upper bound open on both. | |
| 70 if (beta == 180.0) | |
| 71 beta = -180; // -180 == 180 (upside-down) | |
| 72 if (gamma == 90.0) | |
| 73 gamma = nextafter(90, 0); | |
| 74 | |
| 75 // At this point, DCHECKing is paranoia. Never hurts. | |
| 76 DCHECK_GE(beta, -180.0); | |
| 77 DCHECK_LT(beta, 180.0); | |
| 78 DCHECK_GE(gamma, -90.0); | |
| 79 DCHECK_LT(gamma, 90.0); | |
| 80 | |
| 81 buffer->seqlock.WriteBegin(); | |
| 82 buffer->data.beta = beta; | |
| 83 buffer->data.hasBeta = true; | |
| 84 buffer->data.gamma = gamma; | |
| 85 buffer->data.hasGamma = true; | |
| 86 buffer->data.allAvailableSensorsAreActive = true; | |
| 87 buffer->seqlock.WriteEnd(); | |
| 88 } | |
| 89 | |
| 90 } // namespace | |
| 91 | |
| 92 namespace content { | |
| 93 | |
| 94 DataFetcherSharedMemory::DataFetcherSharedMemory() { | |
| 95 } | |
| 96 | |
| 97 DataFetcherSharedMemory::~DataFetcherSharedMemory() { | |
| 98 } | |
| 99 | |
| 100 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) { | |
| 101 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 102 DCHECK(sudden_motion_sensor_); | |
| 103 DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION || | |
| 104 consumer_bitmask & CONSUMER_TYPE_MOTION); | |
| 105 | |
| 106 if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION) | |
| 107 FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_); | |
| 108 if (consumer_bitmask & CONSUMER_TYPE_MOTION) | |
| 109 FetchMotion(sudden_motion_sensor_.get(), motion_buffer_); | |
| 110 } | |
| 111 | |
| 112 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const { | |
| 113 return FETCHER_TYPE_POLLING_CALLBACK; | |
| 114 } | |
| 115 | |
| 116 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
| 117 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 118 DCHECK(buffer); | |
| 119 | |
| 120 if (!sudden_motion_sensor_) | |
| 121 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 122 bool sudden_motion_sensor_available = sudden_motion_sensor_.get() != NULL; | |
| 123 | |
| 124 switch (consumer_type) { | |
| 125 case CONSUMER_TYPE_MOTION: | |
| 126 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
| 127 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionMacAvailable", | |
| 128 sudden_motion_sensor_available); | |
| 129 if (!sudden_motion_sensor_available) { | |
| 130 // No motion sensor available, fire an all-null event. | |
| 131 motion_buffer_->seqlock.WriteBegin(); | |
| 132 motion_buffer_->data.allAvailableSensorsAreActive = true; | |
| 133 motion_buffer_->seqlock.WriteEnd(); | |
| 134 } | |
| 135 return sudden_motion_sensor_available; | |
| 136 case CONSUMER_TYPE_ORIENTATION: | |
| 137 orientation_buffer_ = | |
| 138 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 139 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable", | |
| 140 sudden_motion_sensor_available); | |
| 141 if (sudden_motion_sensor_available) { | |
| 142 // On Mac we cannot provide absolute orientation. | |
| 143 orientation_buffer_->seqlock.WriteBegin(); | |
| 144 orientation_buffer_->data.absolute = false; | |
| 145 orientation_buffer_->data.hasAbsolute = true; | |
| 146 orientation_buffer_->seqlock.WriteEnd(); | |
| 147 } else { | |
| 148 // No motion sensor available, fire an all-null event. | |
| 149 orientation_buffer_->seqlock.WriteBegin(); | |
| 150 orientation_buffer_->data.allAvailableSensorsAreActive = true; | |
| 151 orientation_buffer_->seqlock.WriteEnd(); | |
| 152 } | |
| 153 return sudden_motion_sensor_available; | |
| 154 default: | |
| 155 NOTREACHED(); | |
| 156 } | |
| 157 return false; | |
| 158 } | |
| 159 | |
| 160 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
| 161 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 162 | |
| 163 switch (consumer_type) { | |
| 164 case CONSUMER_TYPE_MOTION: | |
| 165 if (motion_buffer_) { | |
| 166 motion_buffer_->seqlock.WriteBegin(); | |
| 167 motion_buffer_->data.allAvailableSensorsAreActive = false; | |
| 168 motion_buffer_->seqlock.WriteEnd(); | |
| 169 motion_buffer_ = NULL; | |
| 170 } | |
| 171 return true; | |
| 172 case CONSUMER_TYPE_ORIENTATION: | |
| 173 if (orientation_buffer_) { | |
| 174 orientation_buffer_->seqlock.WriteBegin(); | |
| 175 orientation_buffer_->data.allAvailableSensorsAreActive = false; | |
| 176 orientation_buffer_->seqlock.WriteEnd(); | |
| 177 orientation_buffer_ = NULL; | |
| 178 } | |
| 179 return true; | |
| 180 default: | |
| 181 NOTREACHED(); | |
| 182 } | |
| 183 return false; | |
| 184 } | |
| 185 | |
| 186 } // namespace content | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 236833003:
Rename device_orientation to device_sensors (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master