content/browser/device_orientation/sensor_manager_android.h

   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 #ifndef CHROME_BROWSER_DEVICE_ORIENTATION_SENSOR_MANAGER_ANDROID_H_
   6 #define CHROME_BROWSER_DEVICE_ORIENTATION_SENSOR_MANAGER_ANDROID_H_
   7
   8 #include "base/android/scoped_java_ref.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/synchronization/lock.h"
  11 #include "content/common/content_export.h"
  12 #include "content/common/device_orientation/device_motion_hardware_buffer.h"
  13 #include "content/common/device_orientation/device_orientation_hardware_buffer.h"
  14
  15 template<typename T> struct DefaultSingletonTraits;
  16
  17 namespace content {
  18
  19 // Android implementation of Device Orientation API.
  20 //
  21 // Android's SensorManager has a push API, so when Got*() methods are called
  22 // by the system the browser process puts the received data into a shared
  23 // memory buffer, which is read by the renderer processes.
  24 class CONTENT_EXPORT SensorManagerAndroid {
  25  public:
  26   // Must be called at startup, before GetInstance().
  27   static bool Register(JNIEnv* env);
  28
  29   // Needs to be thread-safe, because accessed from different threads.
  30   static SensorManagerAndroid* GetInstance();
  31
  32   // Called from Java via JNI.
  33   void GotOrientation(JNIEnv*, jobject,
  34                       double alpha, double beta, double gamma);
  35   void GotAcceleration(JNIEnv*, jobject,
  36                        double x, double y, double z);
  37   void GotAccelerationIncludingGravity(JNIEnv*, jobject,
  38                                        double x, double y, double z);
  39   void GotRotationRate(JNIEnv*, jobject,
  40                        double alpha, double beta, double gamma);
  41
  42   // Shared memory related methods.
  43   bool StartFetchingDeviceMotionData(DeviceMotionHardwareBuffer* buffer);
  44   void StopFetchingDeviceMotionData();
  45
  46   bool StartFetchingDeviceOrientationData(
  47       DeviceOrientationHardwareBuffer* buffer);
  48   void StopFetchingDeviceOrientationData();
  49
  50  protected:
  51   enum EventType {
  52     // These constants should match DEVICE_ORIENTATION and DEVICE_MOTION
  53     // constants in content/public/android/java/src/org/chromium/content/
  54     // browser/DeviceMotionAndOrientation.java
  55     kTypeOrientation = 0,
  56     kTypeMotion = 1
  57   };
  58
  59   SensorManagerAndroid();
  60   virtual ~SensorManagerAndroid();
  61
  62   virtual bool Start(EventType event_type);
  63   virtual void Stop(EventType event_type);
  64   virtual int GetNumberActiveDeviceMotionSensors();
  65
  66  private:
  67   friend struct DefaultSingletonTraits<SensorManagerAndroid>;
  68
  69   enum {
  70     RECEIVED_MOTION_DATA_ACCELERATION = 0,
  71     RECEIVED_MOTION_DATA_ACCELERATION_INCL_GRAVITY = 1,
  72     RECEIVED_MOTION_DATA_ROTATION_RATE = 2,
  73     RECEIVED_MOTION_DATA_MAX = 3,
  74   };
  75
  76   void CheckMotionBufferReadyToRead();
  77   void SetMotionBufferReadyStatus(bool ready);
  78   void ClearInternalMotionBuffers();
  79
  80   void SetOrientationBufferReadyStatus(bool ready);
  81
  82   // The Java provider of orientation info.
  83   base::android::ScopedJavaGlobalRef<jobject> device_orientation_;
  84   int number_active_device_motion_sensors_;
  85   int received_motion_data_[RECEIVED_MOTION_DATA_MAX];
  86   DeviceMotionHardwareBuffer* device_motion_buffer_;
  87   DeviceOrientationHardwareBuffer* device_orientation_buffer_;
  88   bool is_motion_buffer_ready_;
  89   bool is_orientation_buffer_ready_;
  90
  91   base::Lock motion_buffer_lock_;
  92   base::Lock orientation_buffer_lock_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(SensorManagerAndroid);
  95 };
  96
  97 }  // namespace content
  98
  99 #endif  // CHROME_BROWSER_DEVICE_ORIENTATION_SENSOR_MANAGER_ANDROID_H_