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// Copyright 2014 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 "base/macros.h"
#include "base/memory/ref_counted.h"
#include "chromeos/chromeos_export.h"
namespace gfx {
class Vector3dF;
namespace chromeos {
enum AccelerometerSource {
// Accelerometer is located in the device's screen. In the screen's natural
// orientation, positive X points to the right, consistent with the pixel
// position. Positive Y points up the screen. Positive Z is perpendicular to
// the screen, pointing outwards towards the user. The orientation is
// described at:
// Accelerometer is located in a keyboard attached to the device's screen.
// If the device is open 180 degrees the orientation is consistent with the
// screen. I.e. Positive X points to the right, positive Y points up on the
// keyboard and positive Z is perpendicular to the keyboard pointing out
// towards the user.
struct CHROMEOS_EXPORT AccelerometerReading {
// If true, this accelerometer is being updated.
bool present;
// The readings from this accelerometer measured in m/s^2.
float x;
float y;
float z;
// An accelerometer update contains the last known value for each of the
// accelerometers present on the device.
class CHROMEOS_EXPORT AccelerometerUpdate
: public base::RefCountedThreadSafe<AccelerometerUpdate> {
// Returns true if |source| has a valid value in this update.
bool has(AccelerometerSource source) const { return data_[source].present; }
// Returns the last known value for |source|.
const AccelerometerReading& get(AccelerometerSource source) const {
return data_[source];
// Returns the last known value for |source| as a vector.
gfx::Vector3dF GetVector(AccelerometerSource source) const;
void Set(AccelerometerSource source, float x, float y, float z) {
data_[source].present = true;
data_[source].x = x;
data_[source].y = y;
data_[source].z = z;
// A reading is considered stable if its deviation from gravity is small. This
// returns false if the deviation is too high, or if |source| is not present
// in the update.
bool IsReadingStable(AccelerometerSource source) const;
AccelerometerReading data_[ACCELEROMETER_SOURCE_COUNT];
friend class base::RefCountedThreadSafe<AccelerometerUpdate>;
virtual ~AccelerometerUpdate();
} // namespace chromeos