src/content/browser/gamepad/gamepad_platform_data_fetcher_win.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 CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
   6 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
   7
   8 #include "build/build_config.h"
   9
  10 #ifndef WIN32_LEAN_AND_MEAN
  11 #define WIN32_LEAN_AND_MEAN
  12 #endif
  13 #include <stdlib.h>
  14 #include <Unknwn.h>
  15 #include <WinDef.h>
  16 #include <windows.h>
  17 #include <XInput.h>
  18
  19 #include "base/basictypes.h"
  20 #include "base/compiler_specific.h"
  21 #include "base/memory/scoped_ptr.h"
  22 #include "base/memory/weak_ptr.h"
  23 #include "base/message_loop/message_loop.h"
  24 #include "base/scoped_native_library.h"
  25 #include "content/browser/gamepad/gamepad_data_fetcher.h"
  26 #include "content/browser/gamepad/gamepad_standard_mappings.h"
  27 #include "content/browser/gamepad/raw_input_data_fetcher_win.h"
  28 #include "third_party/WebKit/public/platform/WebGamepads.h"
  29
  30 namespace content {
  31
  32 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  33  public:
  34   GamepadPlatformDataFetcherWin();
  35   virtual ~GamepadPlatformDataFetcherWin();
  36   virtual void GetGamepadData(blink::WebGamepads* pads,
  37                               bool devices_changed_hint) OVERRIDE;
  38   virtual void PauseHint(bool paused) OVERRIDE;
  39
  40  private:
  41   // XInput-specific implementation for GetGamepadData.
  42   bool GetXInputGamepadData(blink::WebGamepads* pads,
  43                             bool devices_changed_hint);
  44
  45   // The three function types we use from xinput1_3.dll.
  46   typedef void (WINAPI *XInputEnableFunc)(BOOL enable);
  47   typedef DWORD (WINAPI *XInputGetCapabilitiesFunc)(
  48     DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES* pCapabilities);
  49   typedef DWORD (WINAPI *XInputGetStateFunc)(
  50       DWORD dwUserIndex, XINPUT_STATE* pState);
  51
  52   // Get functions from dynamically loaded xinput1_3.dll. We don't use
  53   // DELAYLOAD because the import library for Win8 SDK pulls xinput1_4 which
  54   // isn't redistributable. Returns true if loading was successful. We include
  55   // xinput1_3.dll with Chrome.
  56   bool GetXInputDllFunctions();
  57
  58   // Scan for connected XInput and DirectInput gamepads.
  59   void EnumerateDevices(blink::WebGamepads* pads);
  60   bool GetXInputPadConnectivity(int i, blink::WebGamepad* pad) const;
  61
  62   void GetXInputPadData(int i, blink::WebGamepad* pad);
  63   void GetRawInputPadData(int i, blink::WebGamepad* pad);
  64
  65   int FirstAvailableGamepadId() const;
  66   bool HasXInputGamepad(int index) const;
  67   bool HasRawInputGamepad(const HANDLE handle) const;
  68
  69   base::ScopedNativeLibrary xinput_dll_;
  70   bool xinput_available_;
  71
  72   // Function pointers to XInput functionality, retrieved in
  73   // |GetXinputDllFunctions|.
  74   XInputEnableFunc xinput_enable_;
  75   XInputGetCapabilitiesFunc xinput_get_capabilities_;
  76   XInputGetStateFunc xinput_get_state_;
  77
  78   enum PadConnectionStatus {
  79     DISCONNECTED,
  80     XINPUT_CONNECTED,
  81     RAWINPUT_CONNECTED
  82   };
  83
  84   struct PadState {
  85     PadConnectionStatus status;
  86     GamepadStandardMappingFunction mapper;
  87
  88     int xinput_index; // XInput-only
  89     HANDLE raw_input_handle;  // RawInput-only fields.
  90   };
  91   PadState pad_state_[blink::WebGamepads::itemsLengthCap];
  92
  93   scoped_ptr<RawInputDataFetcher> raw_input_fetcher_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
  96 };
  97
  98 }  // namespace content
  99
 100 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_