Implemented Gamepad support via Raw Input on Windows

content/browser/gamepad/raw_input_data_fetcher_win.h

Index: content/browser/gamepad/raw_input_data_fetcher_win.h
diff --git a/content/browser/gamepad/raw_input_data_fetcher_win.h b/content/browser/gamepad/raw_input_data_fetcher_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..3064cbd743b2e5b8298af16478c57366d6e2679d
--- /dev/null
+++ b/content/browser/gamepad/raw_input_data_fetcher_win.h
@@ -0,0 +1,140 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.

[scottmg, 2014/02/03 23:58:15]

nit; 2014

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_GAMEPAD_RAW_INPUT_DATA_FETCHER_WIN_H_
+#define CONTENT_BROWSER_GAMEPAD_RAW_INPUT_DATA_FETCHER_WIN_H_
+
+#include "build/build_config.h"
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN

[scottmg, 2014/02/03 23:58:15]

is this necessary to avoid a conflict? there's other places where we need to
*not* have it, so could induce confusion.

+#endif
+#include <stdlib.h>
+#include <Unknwn.h>
+#include <WinDef.h>
+#include <windows.h>
+
+#include <hidsdi.h>
+#include <map>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/scoped_native_library.h"
+#include "base/win/message_window.h"
+#include "content/browser/gamepad/gamepad_data_fetcher.h"
+#include "content/browser/gamepad/gamepad_standard_mappings.h"
+#include "third_party/WebKit/public/platform/WebGamepads.h"
+
+namespace content {
+
+struct RawGamepadAxis {
+  HIDP_VALUE_CAPS caps;
+  float value;
+};
+
+struct RawGamepadInfo {
+  HANDLE handle;
+  scoped_ptr<uint8[]> ppd_buffer;
+  PHIDP_PREPARSED_DATA preparsed_data;
+
+  uint32_t report_id;
+  uint32_t vendor_id;
+  uint32_t product_id;
+
+  wchar_t id[blink::WebGamepad::idLengthCap];
+
+  uint32_t button_caps_length;
+  scoped_ptr<HIDP_BUTTON_CAPS[]> button_caps;
+
+  uint32_t buttons_length;
+  bool buttons[blink::WebGamepad::buttonsLengthCap];
+
+  uint32_t axes_length;
+  RawGamepadAxis axes[blink::WebGamepad::axesLengthCap];
+};
+
+class RawInputDataFetcher
+    : public base::SupportsWeakPtr<RawInputDataFetcher>,
+      public base::MessageLoop::DestructionObserver {
+ public:
+  explicit RawInputDataFetcher();
+  ~RawInputDataFetcher();
+
+  // DestructionObserver overrides.
+  virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
+
+  bool Available() { return rawinput_available_; }
+  void StartMonitor();
+  void StopMonitor();
+
+  std::vector<RawGamepadInfo*> EnumerateDevices();
+  RawGamepadInfo* GetGamepadInfo(HANDLE handle);
+
+ private:
+  RawGamepadInfo* ParseGamepadInfo(HANDLE hDevice);
+  void UpdateGamepad(RAWINPUT* input, RawGamepadInfo* gamepad_info);
+  // Handles WM_INPUT messages.
+  LRESULT OnInput(HRAWINPUT input_handle);
+  // Handles messages received by |window_|.
+  bool HandleMessage(UINT message,
+                     WPARAM wparam,
+                     LPARAM lparam,
+                     LRESULT* result);
+  RAWINPUTDEVICE* GetRawInputDevices(DWORD flags);
+  void ClearControllers();
+
+  // Function types we use from hid.dll.
+  typedef NTSTATUS (__stdcall *HidPGetCapsFunc)(
+      PHIDP_PREPARSED_DATA PreparsedData, PHIDP_CAPS Capabilities);
+  typedef NTSTATUS (__stdcall *HidPGetButtonCapsFunc)(
+      HIDP_REPORT_TYPE ReportType, PHIDP_BUTTON_CAPS ButtonCaps,
+      PUSHORT ButtonCapsLength, PHIDP_PREPARSED_DATA PreparsedData);
+  typedef NTSTATUS (__stdcall *HidPGetValueCapsFunc)(
+      HIDP_REPORT_TYPE ReportType, PHIDP_VALUE_CAPS ValueCaps,
+      PUSHORT ValueCapsLength, PHIDP_PREPARSED_DATA PreparsedData);
+  typedef NTSTATUS (__stdcall *HidPGetUsagesFunc)(
+      HIDP_REPORT_TYPE ReportType, USAGE UsagePage, USHORT LinkCollection,
+      PUSAGE UsageList, PULONG UsageLength, PHIDP_PREPARSED_DATA PreparsedData,
+      PCHAR Report, ULONG ReportLength);
+  typedef NTSTATUS (__stdcall *HidPGetUsageValueFunc)(
+      HIDP_REPORT_TYPE ReportType, USAGE UsagePage, USHORT LinkCollection,
+      USAGE Usage, PULONG UsageValue, PHIDP_PREPARSED_DATA PreparsedData,
+      PCHAR Report, ULONG ReportLength);
+  typedef NTSTATUS (__stdcall *HidPGetScaledUsageValueFunc)(
+      HIDP_REPORT_TYPE ReportType, USAGE UsagePage, USHORT LinkCollection,
+      USAGE Usage, PLONG UsageValue, PHIDP_PREPARSED_DATA PreparsedData,
+      PCHAR Report, ULONG ReportLength);
+  typedef BOOLEAN (__stdcall *HidDGetStringFunc)(
+      HANDLE HidDeviceObject, PVOID Buffer, ULONG BufferLength);
+
+  // Get functions from dynamically loaded hid.dll. Returns true if loading was
+  // successful.
+  bool GetHidDllFunctions();
+
+  base::ScopedNativeLibrary hid_dll_;
+  scoped_ptr<base::win::MessageWindow> window_;
+  bool rawinput_available_;
+  bool filter_xinput_;
+  bool events_monitored_;
+
+  std::map<HANDLE, RawGamepadInfo*> controllers_;
+
+  // Function pointers to HID functionality, retrieved in
+  // |GetHidDllFunctions|.
+  HidPGetCapsFunc hidp_get_caps_;
+  HidPGetButtonCapsFunc hidp_get_button_caps_;
+  HidPGetValueCapsFunc hidp_get_value_caps_;
+  HidPGetUsagesFunc hidp_get_usages_;
+  HidPGetUsageValueFunc hidp_get_usage_value_;
+  HidPGetScaledUsageValueFunc hidp_get_scaled_usage_value_;
+  HidDGetStringFunc hidd_get_product_string_;
+
+  DISALLOW_COPY_AND_ASSIGN(RawInputDataFetcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GAMEPAD_RAW_INPUT_DATA_FETCHER_WIN_H_