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// Copyright (c) 2012 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 CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_IMPL_ANDROID_H_
#define CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_IMPL_ANDROID_H_
#include "base/android/scoped_java_ref.h"
#include "base/memory/scoped_ptr.h"
#include "base/synchronization/lock.h"
#include "content/browser/device_orientation/device_data.h"
#include "content/common/content_export.h"
#include "content/common/device_orientation/device_motion_hardware_buffer.h"
#include "content/common/device_orientation/device_orientation_hardware_buffer.h"
template<typename T> struct DefaultSingletonTraits;
namespace content {
// Android implementation of Device Orientation API.
//
// Android's SensorManager has a push API, so when Got*() methods are called
// by the system the browser process puts the received data into a shared
// memory buffer, which is read by the renderer processes.
//
// TODO(timvolodine): rename this class to SensorManagerAndroid.
class CONTENT_EXPORT DataFetcherImplAndroid {
public:
// Must be called at startup, before GetInstance().
static bool Register(JNIEnv* env);
// Needs to be thread-safe, because accessed from different threads.
static DataFetcherImplAndroid* GetInstance();
// Called from Java via JNI.
void GotOrientation(JNIEnv*, jobject,
double alpha, double beta, double gamma);
void GotAcceleration(JNIEnv*, jobject,
double x, double y, double z);
void GotAccelerationIncludingGravity(JNIEnv*, jobject,
double x, double y, double z);
void GotRotationRate(JNIEnv*, jobject,
double alpha, double beta, double gamma);
virtual bool Start(DeviceData::Type event_type);
virtual void Stop(DeviceData::Type event_type);
// Shared memory related methods.
bool StartFetchingDeviceMotionData(DeviceMotionHardwareBuffer* buffer);
void StopFetchingDeviceMotionData();
bool StartFetchingDeviceOrientationData(
DeviceOrientationHardwareBuffer* buffer);
void StopFetchingDeviceOrientationData();
protected:
DataFetcherImplAndroid();
virtual ~DataFetcherImplAndroid();
virtual int GetNumberActiveDeviceMotionSensors();
private:
friend struct DefaultSingletonTraits<DataFetcherImplAndroid>;
void CheckMotionBufferReadyToRead();
void SetMotionBufferReadyStatus(bool ready);
void ClearInternalMotionBuffers();
void SetOrientationBufferReadyStatus(bool ready);
enum {
RECEIVED_MOTION_DATA_ACCELERATION = 0,
RECEIVED_MOTION_DATA_ACCELERATION_INCL_GRAVITY = 1,
RECEIVED_MOTION_DATA_ROTATION_RATE = 2,
RECEIVED_MOTION_DATA_MAX = 3,
};
// The Java provider of orientation info.
base::android::ScopedJavaGlobalRef<jobject> device_orientation_;
int number_active_device_motion_sensors_;
int received_motion_data_[RECEIVED_MOTION_DATA_MAX];
DeviceMotionHardwareBuffer* device_motion_buffer_;
DeviceOrientationHardwareBuffer* device_orientation_buffer_;
bool is_motion_buffer_ready_;
bool is_orientation_buffer_ready_;
base::Lock motion_buffer_lock_;
base::Lock orientation_buffer_lock_;
DISALLOW_COPY_AND_ASSIGN(DataFetcherImplAndroid);
};
} // namespace content
#endif // CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_IMPL_ANDROID_H_
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