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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/device_sensors/sensor_manager_chromeos.h"
#include <math.h>
#include "chromeos/accelerometer/accelerometer_reader.h"
#include "chromeos/accelerometer/accelerometer_types.h"
#include "content/browser/device_sensors/inertial_sensor_consts.h"
#include "ui/gfx/geometry/vector3d_f.h"
namespace {
// Conversion ratio from radians to degrees.
const double kRad2deg = 180.0 / M_PI;
}
namespace content {
SensorManagerChromeOS::SensorManagerChromeOS()
: motion_buffer_(nullptr), orientation_buffer_(nullptr) {
}
SensorManagerChromeOS::~SensorManagerChromeOS() {
}
void SensorManagerChromeOS::StartFetchingDeviceMotionData(
DeviceMotionHardwareBuffer* buffer) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!motion_buffer_);
motion_buffer_ = buffer;
motion_buffer_->seqlock.WriteBegin();
// The interval between updates is the longer of the rate set on the buffer,
// and the rate at which AccelerometerReader polls the sensor.
motion_buffer_->data.interval =
std::max(kInertialSensorIntervalMicroseconds / 1000,
chromeos::AccelerometerReader::kDelayBetweenReadsMs);
motion_buffer_->seqlock.WriteEnd();
if (!orientation_buffer_)
StartObservingAccelerometer();
}
bool SensorManagerChromeOS::StopFetchingDeviceMotionData() {
DCHECK(thread_checker_.CalledOnValidThread());
if (!motion_buffer_)
return false;
// Make sure to indicate that the sensor data is no longer available.
motion_buffer_->seqlock.WriteBegin();
motion_buffer_->data.allAvailableSensorsAreActive = false;
motion_buffer_->seqlock.WriteEnd();
motion_buffer_ = nullptr;
if (!orientation_buffer_)
StopObservingAccelerometer();
return true;
}
void SensorManagerChromeOS::StartFetchingDeviceOrientationData(
DeviceOrientationHardwareBuffer* buffer) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!orientation_buffer_);
orientation_buffer_ = buffer;
// No compass information, so we cannot provide absolute orientation.
orientation_buffer_->seqlock.WriteBegin();
orientation_buffer_->data.absolute = false;
orientation_buffer_->data.hasAbsolute = true;
orientation_buffer_->seqlock.WriteEnd();
if (!motion_buffer_)
StartObservingAccelerometer();
}
bool SensorManagerChromeOS::StopFetchingDeviceOrientationData() {
DCHECK(thread_checker_.CalledOnValidThread());
if (!orientation_buffer_)
return false;
// Make sure to indicate that the sensor data is no longer available.
orientation_buffer_->seqlock.WriteBegin();
orientation_buffer_->data.allAvailableSensorsAreActive = false;
orientation_buffer_->seqlock.WriteEnd();
orientation_buffer_ = nullptr;
if (!motion_buffer_)
StopObservingAccelerometer();
return true;
}
void SensorManagerChromeOS::OnAccelerometerUpdated(
scoped_refptr<const chromeos::AccelerometerUpdate> update) {
DCHECK(thread_checker_.CalledOnValidThread());
chromeos::AccelerometerSource source;
if (update->has(chromeos::ACCELEROMETER_SOURCE_SCREEN))
source = chromeos::ACCELEROMETER_SOURCE_SCREEN;
else if (update->has(chromeos::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD))
source = chromeos::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD;
else
return;
double x = update->get(source).x;
double y = update->get(source).y;
double z = update->get(source).z;
GenerateMotionEvent(x, y, z);
GenerateOrientationEvent(x, y, z);
}
void SensorManagerChromeOS::StartObservingAccelerometer() {
chromeos::AccelerometerReader::GetInstance()->AddObserver(this);
}
void SensorManagerChromeOS::StopObservingAccelerometer() {
chromeos::AccelerometerReader::GetInstance()->RemoveObserver(this);
}
void SensorManagerChromeOS::GenerateMotionEvent(double x, double y, double z) {
if (!motion_buffer_)
return;
motion_buffer_->seqlock.WriteBegin();
motion_buffer_->data.accelerationIncludingGravityX = x;
motion_buffer_->data.hasAccelerationIncludingGravityX = true;
motion_buffer_->data.accelerationIncludingGravityY = y;
motion_buffer_->data.hasAccelerationIncludingGravityY = true;
motion_buffer_->data.accelerationIncludingGravityZ = z;
motion_buffer_->data.hasAccelerationIncludingGravityZ = true;
motion_buffer_->data.allAvailableSensorsAreActive = true;
motion_buffer_->seqlock.WriteEnd();
}
void SensorManagerChromeOS::GenerateOrientationEvent(double x,
double y,
double z) {
if (!orientation_buffer_)
return;
// Create a unit vector for trigonometry
// TODO(jonross): Stop reversing signs for vector components once
// accelerometer values have been fixed. crbug.com/431391
// Ternaries are to remove -0.0f which gives incorrect trigonometrical
// results.
gfx::Vector3dF data(x, y ? -y : 0.0f, z ? -z : 0.0f);
data.Scale(1.0f / data.Length());
// Transform accelerometer to W3C angles, using the Z-X-Y Eulerangles matrix.
// x = sin(gamma)
// y = -cos(gamma) * sin(beta)
// z = cos(beta) * cos(gamma)
// With only accelerometer alpha cannot be provided.
double beta = kRad2deg * atan2(data.y(), data.z());
double gamma = kRad2deg * asin(data.x());
// Convert beta and gamma to fit the intervals in the specification. Beta is
// [-180, 180) and gamma is [-90, 90).
if (beta >= 180.0f)
beta = -180.0f;
if (gamma >= 90.0f)
gamma = -90.0f;
orientation_buffer_->seqlock.WriteBegin();
orientation_buffer_->data.beta = beta;
orientation_buffer_->data.hasBeta = true;
orientation_buffer_->data.gamma = gamma;
orientation_buffer_->data.hasGamma = true;
orientation_buffer_->data.allAvailableSensorsAreActive = true;
orientation_buffer_->seqlock.WriteEnd();
}
} // namespace content
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