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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/sensor_manager_chromeos.h" |
| 6 |
| 7 #include "base/bind.h" |
| 8 #include "base/callback.h" |
| 9 #include "base/memory/singleton.h" |
| 10 #include "content/public/browser/sensor_manager_delegate_chromeos.h" |
| 11 #include "ui/gfx/geometry/vector3d_f.h" |
| 12 |
| 13 namespace { |
| 14 // Conversion ratio from radians to degrees. |
| 15 const double kRad2deg = 180.0 / M_PI; |
| 16 } |
| 17 |
| 18 namespace content { |
| 19 |
| 20 SensorManagerChromeOS* SensorManagerChromeOS::GetInstance() { |
| 21 return Singleton<SensorManagerChromeOS, |
| 22 LeakySingletonTraits<SensorManagerChromeOS>>::get(); |
| 23 } |
| 24 |
| 25 void SensorManagerChromeOS::SetDelegate( |
| 26 SensorManagerDelegateChromeOS* delegate) { |
| 27 delegate_ = delegate; |
| 28 } |
| 29 |
| 30 bool SensorManagerChromeOS::StartFetchingDeviceOrientationData( |
| 31 DeviceOrientationHardwareBuffer* buffer) { |
| 32 DCHECK(buffer); |
| 33 if (!delegate_) |
| 34 return false; |
| 35 |
| 36 { |
| 37 // Lock must be released before providing the callback to prevent potential |
| 38 // deadlock. |
| 39 base::AutoLock autolock(orientation_buffer_lock_); |
| 40 orientation_buffer_ = buffer; |
| 41 |
| 42 // No compass information, so we cannot provide absolute orientation. |
| 43 orientation_buffer_->seqlock.WriteBegin(); |
| 44 orientation_buffer_->data.absolute = false; |
| 45 orientation_buffer_->data.hasAbsolute = true; |
| 46 orientation_buffer_->seqlock.WriteEnd(); |
| 47 } |
| 48 |
| 49 OrientationDataCallback callback = base::Bind( |
| 50 &SensorManagerChromeOS::OnAccelerationIncludingGravity, callback_ref_); |
| 51 delegate_->StartFetchingDeviceOrientationData(callback); |
| 52 |
| 53 return true; |
| 54 } |
| 55 |
| 56 void SensorManagerChromeOS::StopFetchingDeviceOrientationData() { |
| 57 if (!delegate_) |
| 58 return; |
| 59 delegate_->StopFetchingDeviceOrientationData(); |
| 60 base::AutoLock autolock(orientation_buffer_lock_); |
| 61 if (!orientation_buffer_) |
| 62 return; |
| 63 // Null message to signify that sensors are no longer available |
| 64 orientation_buffer_->seqlock.WriteBegin(); |
| 65 orientation_buffer_->data.allAvailableSensorsAreActive = false; |
| 66 orientation_buffer_->seqlock.WriteEnd(); |
| 67 orientation_buffer_ = nullptr; |
| 68 } |
| 69 |
| 70 SensorManagerChromeOS::~SensorManagerChromeOS() { |
| 71 } |
| 72 |
| 73 SensorManagerChromeOS::SensorManagerChromeOS() |
| 74 : orientation_buffer_(nullptr), callback_ref_(this), delegate_(nullptr) { |
| 75 } |
| 76 |
| 77 void SensorManagerChromeOS::OnAccelerationIncludingGravity(double x, |
| 78 double y, |
| 79 double z) { |
| 80 base::AutoLock autolock(orientation_buffer_lock_); |
| 81 if (!orientation_buffer_) |
| 82 return; |
| 83 // Create a unit vector for trigonometry |
| 84 // TODO(jonross): Stop reversing signs for vector components once |
| 85 // accelerometer values have been fixed. crbug.com/431391 |
| 86 // Ternaries are to remove -0.0f which gives incorrect trigonometrical |
| 87 // results. |
| 88 gfx::Vector3dF data(x, y ? -y : 0.0f, z ? -z : 0.0f); |
| 89 data.Scale(1.0f / data.Length()); |
| 90 |
| 91 // Transform accelerometer to W3C angles, using the Z-X-Y Eulerangles matrix. |
| 92 // x = sin(gamma) |
| 93 // y = -cos(gamma) * sin(beta) |
| 94 // z = cos(beta) * cos(gamma) |
| 95 // With only accelerometer alpha cannot be provided. |
| 96 double beta = kRad2deg * atan2(data.y(), data.z()); |
| 97 double gamma = kRad2deg * asin(data.x()); |
| 98 |
| 99 // Convert beta and gamma to fit the intervals in the specification. Beta is |
| 100 // [-180, 180) and gamma is [-90, 90). |
| 101 if (beta >= 180.0f) |
| 102 beta = -180.0f; |
| 103 if (gamma >= 90.0f) |
| 104 gamma = -90.0f; |
| 105 // TODO: move chromeos/accelerometer to /content/browser/device_sensors/ and |
| 106 // have it generate the beta and gamma values. crbug.com/431865 |
| 107 orientation_buffer_->seqlock.WriteBegin(); |
| 108 orientation_buffer_->data.beta = beta; |
| 109 orientation_buffer_->data.hasBeta = true; |
| 110 orientation_buffer_->data.gamma = gamma; |
| 111 orientation_buffer_->data.hasGamma = true; |
| 112 orientation_buffer_->data.allAvailableSensorsAreActive = true; |
| 113 orientation_buffer_->seqlock.WriteEnd(); |
| 114 } |
| 115 |
| 116 } // namespace content |
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