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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" | 5 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" |
6 | 6 |
7 #include <stdint.h> | 7 #include <stdint.h> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/metrics/histogram_macros.h" | 10 #include "base/metrics/histogram_macros.h" |
11 #include "base/single_thread_task_runner.h" | 11 #include "base/single_thread_task_runner.h" |
12 #include "content/browser/device_sensors/ambient_light_mac.h" | 12 #include "content/browser/device_sensors/ambient_light_mac.h" |
| 13 #include "device/base/device_util_mac.h" |
13 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | 14 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" |
14 | 15 |
15 namespace { | 16 namespace { |
16 | 17 |
17 const double kMeanGravity = 9.80665; | 18 const double kMeanGravity = 9.80665; |
18 | 19 |
19 double LMUvalueToLux(uint64_t raw_value) { | |
20 // Conversion formula from regression. | |
21 // https://bugzilla.mozilla.org/show_bug.cgi?id=793728 | |
22 // Let x = raw_value, then | |
23 // lux = -2.978303814*(10^-27)*x^4 + 2.635687683*(10^-19)*x^3 - | |
24 // 3.459747434*(10^-12)*x^2 + 3.905829689*(10^-5)*x - 0.1932594532 | |
25 | |
26 static const long double k4 = pow(10.L, -7); | |
27 static const long double k3 = pow(10.L, -4); | |
28 static const long double k2 = pow(10.L, -2); | |
29 static const long double k1 = pow(10.L, 5); | |
30 long double scaled_value = raw_value / k1; | |
31 | |
32 long double lux_value = | |
33 (-3 * k4 * pow(scaled_value, 4)) + (2.6 * k3 * pow(scaled_value, 3)) + | |
34 (-3.4 * k2 * pow(scaled_value, 2)) + (3.9 * scaled_value) - 0.19; | |
35 | |
36 double lux = ceil(static_cast<double>(lux_value)); | |
37 return lux > 0 ? lux : 0; | |
38 } | |
39 | |
40 void FetchLight(content::AmbientLightSensor* sensor, | 20 void FetchLight(content::AmbientLightSensor* sensor, |
41 content::DeviceLightHardwareBuffer* buffer) { | 21 content::DeviceLightHardwareBuffer* buffer) { |
42 DCHECK(sensor); | 22 DCHECK(sensor); |
43 DCHECK(buffer); | 23 DCHECK(buffer); |
44 // Macbook pro has 2 lux values, left and right, we take the average. | 24 // Macbook pro has 2 lux values, left and right, we take the average. |
45 // The raw sensor values are converted to lux using LMUvalueToLux(raw_value) | 25 // The raw sensor values are converted to lux using LMUvalueToLux(raw_value) |
46 // similar to how it is done in Firefox. | 26 // similar to how it is done in Firefox. |
47 uint64_t lux_value[2]; | 27 uint64_t lux_value[2]; |
48 if (!sensor->ReadSensorValue(lux_value)) | 28 if (!sensor->ReadSensorValue(lux_value)) |
49 return; | 29 return; |
50 uint64_t mean = (lux_value[0] + lux_value[1]) / 2; | 30 uint64_t mean = (lux_value[0] + lux_value[1]) / 2; |
51 double lux = LMUvalueToLux(mean); | 31 double lux = device::LMUvalueToLux(mean); |
52 buffer->seqlock.WriteBegin(); | 32 buffer->seqlock.WriteBegin(); |
53 buffer->data.value = lux; | 33 buffer->data.value = lux; |
54 buffer->seqlock.WriteEnd(); | 34 buffer->seqlock.WriteEnd(); |
55 } | 35 } |
56 | 36 |
57 void FetchMotion(SuddenMotionSensor* sensor, | 37 void FetchMotion(SuddenMotionSensor* sensor, |
58 content::DeviceMotionHardwareBuffer* buffer) { | 38 content::DeviceMotionHardwareBuffer* buffer) { |
59 DCHECK(sensor); | 39 DCHECK(sensor); |
60 DCHECK(buffer); | 40 DCHECK(buffer); |
61 | 41 |
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271 light_buffer_ = nullptr; | 251 light_buffer_ = nullptr; |
272 } | 252 } |
273 return true; | 253 return true; |
274 default: | 254 default: |
275 NOTREACHED(); | 255 NOTREACHED(); |
276 } | 256 } |
277 return false; | 257 return false; |
278 } | 258 } |
279 | 259 |
280 } // namespace content | 260 } // namespace content |
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