From a1b08e5d049aeeeb440cff0915827227bb6f4c45 Mon Sep 17 00:00:00 2001
From: Vitaliy Margolen <wine-patches@kievinfo.com>
Date: Sun, 9 Jan 2011 15:43:41 -0700
Subject: [PATCH] dinput: COM cleanup - use helper function instead of direct
 typecast in Linux joystick.

---
 dlls/dinput/joystick_linux.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/dlls/dinput/joystick_linux.c b/dlls/dinput/joystick_linux.c
index 1eb71ff2a5c..fb1372208e2 100644
--- a/dlls/dinput/joystick_linux.c
+++ b/dlls/dinput/joystick_linux.c
@@ -99,6 +99,15 @@ struct JoystickImpl
         POINTL                          povs[4];
 };
 
+static inline JoystickImpl *impl_from_IDirectInputDevice8A(IDirectInputDevice8A *iface)
+{
+    return (JoystickImpl *) iface;
+}
+static inline JoystickImpl *impl_from_IDirectInputDevice8W(IDirectInputDevice8W *iface)
+{
+    return (JoystickImpl *) iface;
+}
+
 static const GUID DInput_Wine_Joystick_GUID = { /* 9e573ed9-7734-11d2-8d4a-23903fb6bdf7 */
   0x9e573ed9,
   0x7734,
@@ -495,7 +504,7 @@ const struct dinput_device joystick_linux_device = {
   */
 static HRESULT WINAPI JoystickLinuxAImpl_Acquire(LPDIRECTINPUTDEVICE8A iface)
 {
-    JoystickImpl *This = (JoystickImpl *)iface;
+    JoystickImpl *This = impl_from_IDirectInputDevice8A(iface);
     HRESULT res;
 
     TRACE("(%p)\n",This);
@@ -524,7 +533,7 @@ static HRESULT WINAPI JoystickLinuxAImpl_Acquire(LPDIRECTINPUTDEVICE8A iface)
   */
 static HRESULT WINAPI JoystickLinuxAImpl_Unacquire(LPDIRECTINPUTDEVICE8A iface)
 {
-    JoystickImpl *This = (JoystickImpl *)iface;
+    JoystickImpl *This = impl_from_IDirectInputDevice8A(iface);
     HRESULT res;
 
     TRACE("(%p)\n",This);
@@ -548,7 +557,7 @@ static void joy_polldev(LPDIRECTINPUTDEVICE8A iface)
 {
     struct pollfd plfd;
     struct js_event jse;
-    JoystickImpl *This = (JoystickImpl*) iface;
+    JoystickImpl *This = impl_from_IDirectInputDevice8A(iface);
 
     TRACE("(%p)\n", This);