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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/metrics/histogram_macros.h" | |
9 | |
10 namespace { | |
11 | |
12 bool SetMotionBuffer(content::DeviceMotionHardwareBuffer* buffer, | |
13 bool enabled) { | |
14 if (!buffer) | |
15 return false; | |
16 buffer->seqlock.WriteBegin(); | |
17 buffer->data.allAvailableSensorsAreActive = enabled; | |
18 buffer->seqlock.WriteEnd(); | |
19 return true; | |
20 } | |
21 | |
22 bool SetOrientationBuffer( | |
23 content::DeviceOrientationHardwareBuffer* buffer, bool enabled) { | |
24 if (!buffer) | |
25 return false; | |
26 buffer->seqlock.WriteBegin(); | |
27 buffer->data.allAvailableSensorsAreActive = enabled; | |
28 buffer->seqlock.WriteEnd(); | |
29 return true; | |
30 } | |
31 | |
32 bool SetLightBuffer(content::DeviceLightHardwareBuffer* buffer, | |
33 double lux) { | |
34 if (!buffer) | |
35 return false; | |
36 buffer->seqlock.WriteBegin(); | |
37 buffer->data.value = lux; | |
38 buffer->seqlock.WriteEnd(); | |
39 return true; | |
40 } | |
41 | |
42 } // namespace | |
43 | |
44 namespace content { | |
45 | |
46 DataFetcherSharedMemory::DataFetcherSharedMemory() {} | |
47 | |
48 DataFetcherSharedMemory::~DataFetcherSharedMemory() { | |
49 } | |
50 | |
51 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
52 DCHECK(buffer); | |
53 | |
54 switch (consumer_type) { | |
55 case CONSUMER_TYPE_MOTION: | |
56 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
57 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionDefaultAvailable", false); | |
58 return SetMotionBuffer(motion_buffer_, true); | |
59 case CONSUMER_TYPE_ORIENTATION: | |
60 orientation_buffer_ = | |
61 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
62 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationDefaultAvailable", | |
63 false); | |
64 return SetOrientationBuffer(orientation_buffer_, true); | |
65 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
66 orientation_absolute_buffer_ = | |
67 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
68 return SetOrientationBuffer(orientation_absolute_buffer_, true); | |
69 case CONSUMER_TYPE_LIGHT: | |
70 light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer); | |
71 return SetLightBuffer(light_buffer_, | |
72 std::numeric_limits<double>::infinity()); | |
73 default: | |
74 NOTREACHED(); | |
75 } | |
76 return false; | |
77 } | |
78 | |
79 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
80 switch (consumer_type) { | |
81 case CONSUMER_TYPE_MOTION: | |
82 return SetMotionBuffer(motion_buffer_, false); | |
83 case CONSUMER_TYPE_ORIENTATION: | |
84 return SetOrientationBuffer(orientation_buffer_, false); | |
85 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
86 return SetOrientationBuffer(orientation_absolute_buffer_, false); | |
87 case CONSUMER_TYPE_LIGHT: | |
88 return SetLightBuffer(light_buffer_, -1); | |
89 default: | |
90 NOTREACHED(); | |
91 } | |
92 return false; | |
93 } | |
94 | |
95 } // namespace content | |
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