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 <windows.h>
  14 #include <XInput.h>
  15
  16 #include "base/basictypes.h"
  17 #include "base/compiler_specific.h"
  18 #include "base/scoped_native_library.h"
  19 #include "content/browser/gamepad/gamepad_data_fetcher.h"
  20
  21 namespace content {
  22
  23 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  24  public:
  25   GamepadPlatformDataFetcherWin();
  26   virtual ~GamepadPlatformDataFetcherWin();
  27   virtual void GetGamepadData(WebKit::WebGamepads* pads,
  28                               bool devices_changed_hint) OVERRIDE;
  29  private:
  30   // The three function types we use from xinput1_3.dll.
  31   typedef void (WINAPI *XInputEnableFunc)(BOOL enable);
  32   typedef DWORD (WINAPI *XInputGetCapabilitiesFunc)(
  33     DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES* pCapabilities);
  34   typedef DWORD (WINAPI *XInputGetStateFunc)(
  35       DWORD dwUserIndex, XINPUT_STATE* pState);
  36
  37   // Get functions from dynamically loaded xinput1_3.dll. We don't use
  38   // DELAYLOAD because the import library for Win8 SDK pulls xinput1_4 which
  39   // isn't redistributable. Returns true if loading was successful. We include
  40   // xinput1_3.dll with Chrome.
  41   bool GetXinputDllFunctions();
  42
  43   base::ScopedNativeLibrary xinput_dll_;
  44   bool xinput_available_;
  45
  46   // Function pointers to XInput functionality, retrieved in
  47   // |GetXinputDllFunctions|.
  48   XInputEnableFunc xinput_enable_;
  49   XInputGetCapabilitiesFunc xinput_get_capabilities_;
  50   XInputGetStateFunc xinput_get_state_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
  53 };
  54
  55 }  // namespace content
  56
  57 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_