Implement support for USB Xbox360 controllers without a driver on Mac.

content/browser/gamepad/gamepad_platform_data_fetcher_mac.h

 // 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_PLATFORM_DATA_FETCHER_MAC_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_MAC_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_cftyperef.h"
+#include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "content/browser/gamepad/gamepad_data_fetcher.h"
 #include "content/browser/gamepad/gamepad_standard_mappings.h"
+#include "content/browser/gamepad/xbox_data_fetcher_mac.h"
 #include "content/common/gamepad_hardware_buffer.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGamepads.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDManager.h>
 
 #if defined(__OBJC__)
 @class NSArray;
 #else
 class NSArray;
 #endif
 
 namespace content {
 
-class GamepadPlatformDataFetcherMac : public GamepadDataFetcher {
+class GamepadPlatformDataFetcherMac : public GamepadDataFetcher,
+                                      public XboxDataFetcher::Delegate {
  public:
   GamepadPlatformDataFetcherMac();
   virtual ~GamepadPlatformDataFetcherMac();
   virtual void GetGamepadData(WebKit::WebGamepads* pads,
                               bool devices_changed_hint) OVERRIDE;
   virtual void PauseHint(bool paused) OVERRIDE;
 
  private:
   bool enabled_;
   base::mac::ScopedCFTypeRef<IOHIDManagerRef> hid_manager_ref_;
 
   static GamepadPlatformDataFetcherMac* InstanceFromContext(void* context);
   static void DeviceAddCallback(void* context,
                                 IOReturn result,
                                 void* sender,
                                 IOHIDDeviceRef ref);
   static void DeviceRemoveCallback(void* context,
                                    IOReturn result,
                                    void* sender,
                                    IOHIDDeviceRef ref);
   static void ValueChangedCallback(void* context,
                                    IOReturn result,
                                    void* sender,
                                    IOHIDValueRef ref);
 
+  size_t GetEmptySlot();
+  size_t GetSlotForDevice(IOHIDDeviceRef device);
+  size_t GetSlotForXboxDevice(XboxController* device);
+
   void DeviceAdd(IOHIDDeviceRef device);
   void AddButtonsAndAxes(NSArray* elements, size_t slot);
   void DeviceRemove(IOHIDDeviceRef device);
   void ValueChanged(IOHIDValueRef value);
 
+  virtual void XboxDeviceAdd(XboxController* device) OVERRIDE;
+  virtual void XboxDeviceRemove(XboxController* device) OVERRIDE;
+  virtual void XboxValueChanged(XboxController* device,
+                                const XboxController::Data& data) OVERRIDE;
+
   void RegisterForNotifications();
   void UnregisterFromNotifications();
 
+  scoped_ptr<XboxDataFetcher> xbox_fetcher_;
+
   WebKit::WebGamepads data_;
 
   // Side-band data that's not passed to the consumer, but we need to maintain
   // to update data_.
   struct AssociatedData {
-    IOHIDDeviceRef device_ref;
-    IOHIDElementRef button_elements[WebKit::WebGamepad::buttonsLengthCap];
-    IOHIDElementRef axis_elements[WebKit::WebGamepad::buttonsLengthCap];
-    CFIndex axis_minimums[WebKit::WebGamepad::axesLengthCap];
-    CFIndex axis_maximums[WebKit::WebGamepad::axesLengthCap];
-    // Function to map from device data to standard layout, if available. May
-    // be null if no mapping is available.
-    GamepadStandardMappingFunction mapper;
+    bool is_xbox;
+    union {
+      struct {
+        IOHIDDeviceRef device_ref;
+        IOHIDElementRef button_elements[WebKit::WebGamepad::buttonsLengthCap];
+        IOHIDElementRef axis_elements[WebKit::WebGamepad::buttonsLengthCap];
+        CFIndex axis_minimums[WebKit::WebGamepad::axesLengthCap];
+        CFIndex axis_maximums[WebKit::WebGamepad::axesLengthCap];
+        // Function to map from device data to standard layout, if available.
+        // May be null if no mapping is available.
+        GamepadStandardMappingFunction mapper;
+      } hid;
+      struct {
+        XboxController* device;
+        UInt32 location_id;
+      } xbox;
+    };
   };
   AssociatedData associated_[WebKit::WebGamepads::itemsLengthCap];
 
   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_MAC_H_