blob: 22c39c58495f740e4f06478f8dca6d1f16d554cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// 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 CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop_proxy.h"
#include "base/shared_memory.h"
#include "base/synchronization/lock.h"
#include "base/system_monitor/system_monitor.h"
#include "content/common/content_export.h"
namespace base {
class Thread;
}
namespace content {
class GamepadDataFetcher;
struct GamepadHardwareBuffer;
class CONTENT_EXPORT GamepadProvider :
public base::SystemMonitor::DevicesChangedObserver {
public:
explicit GamepadProvider();
virtual ~GamepadProvider();
// Set the platform-specific data fetcher. Mostly used for testing.
void SetDataFetcher(GamepadDataFetcher* fetcher);
base::SharedMemoryHandle GetRendererSharedMemoryHandle(
base::ProcessHandle renderer_process);
// Pause and resume the background polling thread. Can be called from any
// thread.
void Pause();
void Resume();
// base::SystemMonitor::DevicesChangedObserver implementation.
virtual void OnDevicesChanged(base::SystemMonitor::DeviceType type) OVERRIDE;
private:
// Method for setting up the platform-specific data fetcher. Takes ownership
// of |fetcher|.
void DoInitializePollingThread(GamepadDataFetcher* fetcher);
// Method for sending pause hints to the low-level data fetcher. Runs on
// polling_thread_.
void SendPauseHint(bool paused);
// Method for polling a GamepadDataFetcher. Runs on the polling_thread_.
void DoPoll();
void ScheduleDoPoll();
GamepadHardwareBuffer* SharedMemoryAsHardwareBuffer();
enum { kDesiredSamplingIntervalMs = 16 };
// Keeps track of when the background thread is paused. Access to is_paused_
// must be guarded by is_paused_lock_.
base::Lock is_paused_lock_;
bool is_paused_;
// Keep track of when a polling task is schedlued, so as to prevent us from
// accidentally scheduling more than one at any time, when rapidly toggling
// |is_paused_|.
bool have_scheduled_do_poll_;
// Updated based on notification from SystemMonitor when the system devices
// have been updated, and this notification is passed on to the data fetcher
// to enable it to avoid redundant (and possibly expensive) is-connected
// tests. Access to devices_changed_ must be guarded by
// devices_changed_lock_.
base::Lock devices_changed_lock_;
bool devices_changed_;
// When polling_thread_ is running, members below are only to be used
// from that thread.
scoped_ptr<GamepadDataFetcher> data_fetcher_;
base::SharedMemory gamepad_shared_memory_;
// Polling is done on this background thread.
scoped_ptr<base::Thread> polling_thread_;
static GamepadProvider* instance_;
DISALLOW_COPY_AND_ASSIGN(GamepadProvider);
};
} // namespace content
#endif // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
|
