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