src/content/browser/device_orientation/data_fetcher_impl_android.h

   1 // Copyright (c) 2012 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_DATA_FETCHER_IMPL_ANDROID_H_
   6 #define CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_IMPL_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/browser/device_orientation/device_data.h"
  12 #include "content/common/content_export.h"
  13 #include "content/common/device_orientation/device_motion_hardware_buffer.h"
  14 #include "content/common/device_orientation/device_orientation_hardware_buffer.h"
  15
  16 template<typename T> struct DefaultSingletonTraits;
  17
  18 namespace content {
  19
  20 // Android implementation of Device Orientation API.
  21 //
  22 // Android's SensorManager has a push API, so when Got*() methods are called
  23 // by the system the browser process puts the received data into a shared
  24 // memory buffer, which is read by the renderer processes.
  25 //
  26
  27 // TODO(timvolodine): rename this class to SensorManagerAndroid.
  28 class CONTENT_EXPORT DataFetcherImplAndroid {
  29  public:
  30   // Must be called at startup, before GetInstance().
  31   static bool Register(JNIEnv* env);
  32
  33   // Needs to be thread-safe, because accessed from different threads.
  34   static DataFetcherImplAndroid* GetInstance();
  35
  36   // Called from Java via JNI.
  37   void GotOrientation(JNIEnv*, jobject,
  38                       double alpha, double beta, double gamma);
  39   void GotAcceleration(JNIEnv*, jobject,
  40                        double x, double y, double z);
  41   void GotAccelerationIncludingGravity(JNIEnv*, jobject,
  42                                        double x, double y, double z);
  43   void GotRotationRate(JNIEnv*, jobject,
  44                        double alpha, double beta, double gamma);
  45
  46   virtual bool Start(DeviceData::Type event_type);
  47   virtual void Stop(DeviceData::Type event_type);
  48
  49   // Shared memory related methods.
  50   bool StartFetchingDeviceMotionData(DeviceMotionHardwareBuffer* buffer);
  51   void StopFetchingDeviceMotionData();
  52
  53   bool StartFetchingDeviceOrientationData(
  54       DeviceOrientationHardwareBuffer* buffer);
  55   void StopFetchingDeviceOrientationData();
  56
  57  protected:
  58   DataFetcherImplAndroid();
  59   virtual ~DataFetcherImplAndroid();
  60
  61   virtual int GetNumberActiveDeviceMotionSensors();
  62
  63  private:
  64   friend struct DefaultSingletonTraits<DataFetcherImplAndroid>;
  65
  66   void CheckMotionBufferReadyToRead();
  67   void SetMotionBufferReadyStatus(bool ready);
  68   void ClearInternalMotionBuffers();
  69
  70   void SetOrientationBufferReadyStatus(bool ready);
  71
  72   enum {
  73     RECEIVED_MOTION_DATA_ACCELERATION = 0,
  74     RECEIVED_MOTION_DATA_ACCELERATION_INCL_GRAVITY = 1,
  75     RECEIVED_MOTION_DATA_ROTATION_RATE = 2,
  76     RECEIVED_MOTION_DATA_MAX = 3,
  77   };
  78
  79   // The Java provider of orientation info.
  80   base::android::ScopedJavaGlobalRef<jobject> device_orientation_;
  81   int number_active_device_motion_sensors_;
  82   int received_motion_data_[RECEIVED_MOTION_DATA_MAX];
  83   DeviceMotionHardwareBuffer* device_motion_buffer_;
  84   DeviceOrientationHardwareBuffer* device_orientation_buffer_;
  85   bool is_motion_buffer_ready_;
  86   bool is_orientation_buffer_ready_;
  87
  88   base::Lock motion_buffer_lock_;
  89   base::Lock orientation_buffer_lock_;
  90
  91   DISALLOW_COPY_AND_ASSIGN(DataFetcherImplAndroid);
  92 };
  93
  94 }  // namespace content
  95
  96 #endif  // CHROME_BROWSER_DEVICE_ORIENTATION_DATA_FETCHER_IMPL_ANDROID_H_