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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 "content/browser/geolocation/gps_location_provider_linux.h" | 5 #include "content/browser/geolocation/gps_location_provider_linux.h" |
| 6 | 6 |
| 7 #include <algorithm> | 7 #include <algorithm> |
| 8 #include <cmath> | 8 #include <cmath> |
| 9 | 9 |
| 10 #include "base/compiler_specific.h" | 10 #include "base/compiler_specific.h" |
| 11 #include "base/logging.h" | 11 #include "base/logging.h" |
| 12 #include "base/message_loop.h" | 12 #include "base/message_loop.h" |
| 13 #include "content/browser/geolocation/libgps_wrapper_linux.h" | 13 #include "content/browser/geolocation/libgps_wrapper_linux.h" |
| 14 | 14 |
| 15 namespace { | 15 namespace { |
| 16 const int kGpsdReconnectRetryIntervalMillis = 10 * 1000; | 16 const int kGpsdReconnectRetryIntervalMillis = 10 * 1000; |
| 17 // As per http://gpsd.berlios.de/performance.html#id374524, poll twice per sec. | 17 // As per http://gpsd.berlios.de/performance.html#id374524, poll twice per sec. |
| 18 const int kPollPeriodMovingMillis = 500; | 18 const int kPollPeriodMovingMillis = 500; |
| 19 // Poll less frequently whilst stationary. | 19 // Poll less frequently whilst stationary. |
| 20 const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3; | 20 const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3; |
| 21 // GPS reading must differ by more than this amount to be considered movement. | 21 // GPS reading must differ by more than this amount to be considered movement. |
| 22 const int kMovementThresholdMeters = 20; | 22 const int kMovementThresholdMeters = 20; |
| 23 | 23 |
| 24 // This algorithm is reused from the corresponding code in the gears project. | 24 // This algorithm is reused from the corresponding code in the Gears project. |
| 25 // The arbitrary delta is decreased (gears used 100 meters); if we need to | 25 // The arbitrary delta is decreased (Gears used 100 meters); if we need to |
| 26 // decrease it any further we'll likely want to do some smarter filtering to | 26 // decrease it any further we'll likely want to do some smarter filtering to |
| 27 // remove GPS location jitter noise. | 27 // remove GPS location jitter noise. |
| 28 bool PositionsDifferSiginificantly(const Geoposition& position_1, | 28 bool PositionsDifferSiginificantly(const Geoposition& position_1, |
| 29 const Geoposition& position_2) { | 29 const Geoposition& position_2) { |
| 30 const bool pos_1_valid = position_1.IsValidFix(); | 30 const bool pos_1_valid = position_1.IsValidFix(); |
| 31 if (pos_1_valid != position_2.IsValidFix()) | 31 if (pos_1_valid != position_2.IsValidFix()) |
| 32 return true; | 32 return true; |
| 33 if (!pos_1_valid) { | 33 if (!pos_1_valid) { |
| 34 DCHECK(!position_2.IsValidFix()); | 34 DCHECK(!position_2.IsValidFix()); |
| 35 return false; | 35 return false; |
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| 118 task_factory_.RevokeAll(); | 118 task_factory_.RevokeAll(); |
| 119 MessageLoop::current()->PostDelayedTask( | 119 MessageLoop::current()->PostDelayedTask( |
| 120 FROM_HERE, | 120 FROM_HERE, |
| 121 task_factory_.NewRunnableMethod(&GpsLocationProviderLinux::DoGpsPollTask), | 121 task_factory_.NewRunnableMethod(&GpsLocationProviderLinux::DoGpsPollTask), |
| 122 interval); | 122 interval); |
| 123 } | 123 } |
| 124 | 124 |
| 125 LocationProviderBase* NewSystemLocationProvider() { | 125 LocationProviderBase* NewSystemLocationProvider() { |
| 126 return new GpsLocationProviderLinux(LibGps::New); | 126 return new GpsLocationProviderLinux(LibGps::New); |
| 127 } | 127 } |
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