device/generic_sensor/public/cpp/sensor_reading.h - Issue 2865263002: Move //device/generic_sensor to be part of the internal implementation of the Device Service.

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Issue 2865263002: Move //device/generic_sensor to be part of the internal implementation of the Device Service. (Closed)

Patch Set: code rebase Created 3 years, 7 months ago

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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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