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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 #ifndef DEVICE_GENERIC_SENSOR_PUBLIC_CPP_SENSOR_READING_H_ |
| 6 #define DEVICE_GENERIC_SENSOR_PUBLIC_CPP_SENSOR_READING_H_ |
| 7 |
| 8 #include "device/base/synchronization/one_writer_seqlock.h" |
| 9 #include "device/generic_sensor/public/cpp/generic_sensor_public_export.h" |
| 10 #include "device/generic_sensor/public/interfaces/sensor.mojom.h" |
| 11 |
| 12 namespace device { |
| 13 |
| 14 // This class is guarantied to have a fixed size of 64 bits on every platform. |
| 15 // It is introduce to simplify sensors shared buffer memory calculation. |
| 16 template <typename Data> |
| 17 class SensorReadingField { |
| 18 public: |
| 19 static_assert(sizeof(Data) <= sizeof(int64_t), |
| 20 "The field size must be <= 64 bits."); |
| 21 SensorReadingField() = default; |
| 22 SensorReadingField(Data value) { storage_.value = value; } |
| 23 SensorReadingField& operator=(Data value) { |
| 24 storage_.value = value; |
| 25 return *this; |
| 26 } |
| 27 Data& value() { return storage_.value; } |
| 28 const Data& value() const { return storage_.value; } |
| 29 |
| 30 operator Data() const { return storage_.value; } |
| 31 |
| 32 private: |
| 33 union Storage { |
| 34 int64_t unused; |
| 35 Data value; |
| 36 Storage() { new (&value) Data(); } |
| 37 ~Storage() { value.~Data(); } |
| 38 }; |
| 39 Storage storage_; |
| 40 }; |
| 41 |
| 42 // This structure represents sensor reading data: timestamp and 4 values. |
| 43 struct DEVICE_GENERIC_SENSOR_PUBLIC_EXPORT SensorReading { |
| 44 SensorReading(); |
| 45 ~SensorReading(); |
| 46 SensorReading(const SensorReading& other); |
| 47 SensorReadingField<double> timestamp; |
| 48 constexpr static int kValuesCount = 4; |
| 49 // AMBIENT_LIGHT: |
| 50 // values[0]: ambient light level in SI lux units. |
| 51 // |
| 52 // PROXIMITY: |
| 53 // values[0]: proximity sensor distance measured in centimeters. |
| 54 // |
| 55 // ACCELEROMETER: |
| 56 // values[0]: acceleration minus Gx on the x-axis. |
| 57 // values[1]: acceleration minus Gy on the y-axis. |
| 58 // values[2]: acceleration minus Gz on the z-axis. |
| 59 // |
| 60 // LINEAR_ACCELERATION: |
| 61 // values[0]: acceleration on the x-axis. |
| 62 // values[1]: acceleration on the y-axis. |
| 63 // values[2]: acceleration on the z-axis. |
| 64 // |
| 65 // GYROSCOPE: |
| 66 // values[0]: angular speed around the x-axis. |
| 67 // values[1]: angular speed around the y-axis. |
| 68 // values[2]: angular speed around the z-axis. |
| 69 // |
| 70 // MAGNETOMETER: |
| 71 // values[0]: ambient magnetic field in the x-axis in micro-Tesla (uT). |
| 72 // values[1]: ambient magnetic field in the y-axis in micro-Tesla (uT). |
| 73 // values[2]: ambient magnetic field in the z-axis in micro-Tesla (uT). |
| 74 // |
| 75 // PRESSURE: |
| 76 // values[0]: atmospheric pressure in hPa (millibar). |
| 77 // |
| 78 // ABSOLUTE_ORIENTATION: |
| 79 // values[0]: x value of a quaternion representing the orientation of the |
| 80 // device in 3D space. |
| 81 // values[1]: y value of a quaternion representing the orientation of the |
| 82 // device in 3D space. |
| 83 // values[2]: z value of a quaternion representing the orientation of the |
| 84 // device in 3D space. |
| 85 // values[3]: w value of a quaternion representing the orientation of the |
| 86 // device in 3D space. |
| 87 // |
| 88 // RELATIVE_ORIENTATION: |
| 89 // (Identical to ABSOLUTE_ORIENTATION except that it doesn't use the |
| 90 // geomagnetic field.) |
| 91 // values[0]: x value of a quaternion representing the orientation of the |
| 92 // device in 3D space. |
| 93 // values[1]: y value of a quaternion representing the orientation of the |
| 94 // device in 3D space. |
| 95 // values[2]: z value of a quaternion representing the orientation of the |
| 96 // device in 3D space. |
| 97 // values[3]: w value of a quaternion representing the orientation of the |
| 98 // device in 3D space. |
| 99 SensorReadingField<double> values[kValuesCount]; |
| 100 }; |
| 101 |
| 102 // This structure represents sensor reading buffer: sensor reading and seqlock |
| 103 // for synchronization. |
| 104 struct DEVICE_GENERIC_SENSOR_PUBLIC_EXPORT SensorReadingSharedBuffer { |
| 105 SensorReadingSharedBuffer(); |
| 106 ~SensorReadingSharedBuffer(); |
| 107 SensorReadingField<OneWriterSeqLock> seqlock; |
| 108 SensorReading reading; |
| 109 |
| 110 // Gets the shared reading buffer offset for the given sensor type. |
| 111 static uint64_t GetOffset(mojom::SensorType type); |
| 112 }; |
| 113 |
| 114 } // namespace device |
| 115 |
| 116 #endif // DEVICE_GENERIC_SENSOR_PUBLIC_CPP_SENSOR_READING_H_ |
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