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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 "chrome/browser/geolocation/gps_location_provider_linux.h" | 5 #include "chrome/browser/geolocation/gps_location_provider_linux.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <cmath> | 8 #include <cmath> |
9 #include "base/compiler_specific.h" | 9 #include "base/compiler_specific.h" |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "base/message_loop.h" | 11 #include "base/message_loop.h" |
12 #include "chrome/browser/geolocation/libgps_wrapper_linux.h" | 12 #include "chrome/browser/geolocation/libgps_wrapper_linux.h" |
13 | 13 |
14 namespace { | 14 namespace { |
15 const int kGpsdReconnectRetryIntervalMillis = 10 * 1000; | 15 const int kGpsdReconnectRetryIntervalMillis = 10 * 1000; |
16 // As per http://gpsd.berlios.de/performance.html#id374524, poll twice per sec. | 16 // As per http://gpsd.berlios.de/performance.html#id374524, poll twice per sec. |
17 const int kPollPeriodMovingMillis = 500; | 17 const int kPollPeriodMovingMillis = 500; |
18 // Poll less frequently whilst stationary. | 18 // Poll less frequently whilst stationary. |
19 const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3; | 19 const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3; |
20 // GPS reading must differ by more than this amount to be considered movement. | 20 // GPS reading must differ by more than this amount to be considered movement. |
21 const int kMovementThresholdMeters = 20; | 21 const int kMovementThresholdMeters = 20; |
22 | 22 |
23 // This algorithm is reused from the corresponding code in the gears project. | 23 // This algorithm is reused from the corresponding code in the Gears project. |
24 // The arbitrary delta is decreased (gears used 100 meters); if we need to | 24 // The arbitrary delta is decreased (Gears used 100 meters); if we need to |
25 // decrease it any further we'll likely want to do some smarter filtering to | 25 // decrease it any further we'll likely want to do some smarter filtering to |
26 // remove GPS location jitter noise. | 26 // remove GPS location jitter noise. |
27 bool PositionsDifferSiginificantly(const Geoposition& position_1, | 27 bool PositionsDifferSiginificantly(const Geoposition& position_1, |
28 const Geoposition& position_2) { | 28 const Geoposition& position_2) { |
29 const bool pos_1_valid = position_1.IsValidFix(); | 29 const bool pos_1_valid = position_1.IsValidFix(); |
30 if (pos_1_valid != position_2.IsValidFix()) | 30 if (pos_1_valid != position_2.IsValidFix()) |
31 return true; | 31 return true; |
32 if (!pos_1_valid) { | 32 if (!pos_1_valid) { |
33 DCHECK(!position_2.IsValidFix()); | 33 DCHECK(!position_2.IsValidFix()); |
34 return false; | 34 return false; |
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117 task_factory_.RevokeAll(); | 117 task_factory_.RevokeAll(); |
118 MessageLoop::current()->PostDelayedTask( | 118 MessageLoop::current()->PostDelayedTask( |
119 FROM_HERE, | 119 FROM_HERE, |
120 task_factory_.NewRunnableMethod(&GpsLocationProviderLinux::DoGpsPollTask), | 120 task_factory_.NewRunnableMethod(&GpsLocationProviderLinux::DoGpsPollTask), |
121 interval); | 121 interval); |
122 } | 122 } |
123 | 123 |
124 LocationProviderBase* NewSystemLocationProvider() { | 124 LocationProviderBase* NewSystemLocationProvider() { |
125 return new GpsLocationProviderLinux(LibGps::New); | 125 return new GpsLocationProviderLinux(LibGps::New); |
126 } | 126 } |
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