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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.
#ifndef CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
#define CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "chromeos/accelerometer/accelerometer_reader.h"
#include "chromeos/accelerometer/accelerometer_types.h"
#include "content/common/content_export.h"
#include "content/common/device_sensors/device_orientation_hardware_buffer.h"
namespace content {
// Observes Chrome OS accelerometer sensors, and provides updated device
// orientation information.
class CONTENT_EXPORT SensorManagerChromeOS
: public chromeos::AccelerometerReader::Observer {
public:
SensorManagerChromeOS();
~SensorManagerChromeOS() override;
// Begins monitoring of orientation events, the shared memory of |buffer| will
// be updated upon subsequent events.
bool StartFetchingDeviceOrientationData(
DeviceOrientationHardwareBuffer* buffer);
// Stops monitoring orientation events. Returns true if there is an active
// |orientation_buffer_| and fetching stops. Otherwise returns false.
bool StopFetchingDeviceOrientationData();
// chromeos::AccelerometerReader::Observer:
void OnAccelerometerUpdated(
const chromeos::AccelerometerUpdate& update) override;
protected:
// Begins/ends the observation of accelerometer events.
virtual void StartObservingAccelerometer();
virtual void StopObservingAccelerometer();
private:
// Shared memory to update.
DeviceOrientationHardwareBuffer* orientation_buffer_;
// Synchronize orientation_buffer_ across threads.
base::Lock orientation_buffer_lock_;
DISALLOW_COPY_AND_ASSIGN(SensorManagerChromeOS);
};
} // namespace content
#endif // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
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