wintab32: Better handling of XInput initialisation errors.

dlls/winex11.drv/wintab.c

@@ -484,7 +484,7 @@ static void disable_system_cursors(void)
 /***********************************************************************
  *             X11DRV_LoadTabletInfo (X11DRV.@)
  */
-void CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
+BOOL CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
 {
     const WCHAR SZ_CONTEXT_NAME[] = {'W','i','n','e',' ','T','a','b','l','e','t',' ','C','o','n','t','e','x','t',0};
     const WCHAR SZ_DEVICE_NAME[] = {'W','i','n','e',' ','T','a','b','l','e','t',' ','D','e','v','i','c','e',0};
@@ -507,7 +507,7 @@ void CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
     if (!X11DRV_XInput_Init())
     {
         ERR("Unable to initialize the XInput library.\n");
-        return;
+        return FALSE;
     }
 
     hwndTabletDefault = hwnddefault;
@@ -555,9 +555,9 @@ void CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
     devices = pXListInputDevices(data->display, &num_devices);
     if (!devices)
     {
-        WARN("XInput Extensions reported as not avalable\n");
+        WARN("XInput Extensions reported as not available\n");
         wine_tsx11_unlock();
-        return;
+        return FALSE;
     }
     TRACE("XListInputDevices reports %d devices\n", num_devices);
     for (loop=0; loop < num_devices; loop++)
@@ -778,6 +778,7 @@ void CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
     }
 
     wine_tsx11_unlock();
+    return TRUE;
 }
 
 static int figure_deg(int x, int y)
@@ -971,7 +972,7 @@ int CDECL X11DRV_AttachEventQueueToTablet(HWND hOwner)
     XEventClass     event_list[7];
     Window          win = X11DRV_get_whole_window( hOwner );
 
-    if (!win) return 0;
+    if (!win || !xinput_handle) return 0;
 
     TRACE("Creating context for window %p (%lx)  %i cursors\n", hOwner, win, gNumCursors);
 
@@ -1080,6 +1081,8 @@ UINT CDECL X11DRV_WTInfoW(UINT wCategory, UINT nIndex, LPVOID lpOutput)
     LPWTI_CURSORS_INFO  tgtcursor;
     TRACE("(%u, %u, %p)\n", wCategory, nIndex, lpOutput);
 
+    if (!xinput_handle) return 0;
+
     switch(wCategory)
     {
         case 0:
@@ -1512,8 +1515,9 @@ int CDECL X11DRV_GetCurrentPacket(LPWTPACKET packet)
 /***********************************************************************
  *		LoadTabletInfo (X11DRV.@)
  */
-void CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
+BOOL CDECL X11DRV_LoadTabletInfo(HWND hwnddefault)
 {
+    return FALSE;
 }
 
 /***********************************************************************

dlls/wintab32/context.c

@@ -42,7 +42,6 @@ WINE_DEFAULT_DEBUG_CHANNEL(wintab32);
  * http://www.csl.sony.co.jp/projects/ar/restricted/wintabl.html
  */
 
-static BOOL gLoaded;
 static LPOPENCONTEXT gOpenContexts;
 static HCTX gTopContext = (HCTX)0xc00;
 
@@ -151,12 +150,26 @@ static LPOPENCONTEXT TABLET_FindOpenContext(HCTX hCtx)
     return NULL;
 }
 
-static void LoadTablet(void)
+static inline BOOL LoadTablet(void)
 {
-    TRACE("Initializing the tablet to hwnd %p\n",hwndDefault);
-    gLoaded= TRUE;
-    if (pLoadTabletInfo)
-        pLoadTabletInfo(hwndDefault);
+    static enum {TI_START = 0, TI_OK, TI_FAIL} loaded = TI_START;
+
+    if (loaded == TI_START)
+    {
+        TRACE("Initializing the tablet to hwnd %p\n",hwndDefault);
+
+        if (pLoadTabletInfo && pLoadTabletInfo(hwndDefault))
+        {
+            loaded = TI_OK;
+        }
+        else
+        {
+            loaded = TI_FAIL;
+            ERR("LoadTabletInfo(%p) failed\n", hwndDefault);
+        }
+    }
+
+    return loaded == TI_OK;
 }
 
 int TABLET_PostTabletMessage(LPOPENCONTEXT newcontext, UINT msg, WPARAM wParam,
@@ -366,9 +379,9 @@ static UINT WTInfoT(UINT wCategory, UINT nIndex, LPVOID lpOutput, BOOL bUnicode)
 {
     UINT result;
 
+    if (!LoadTablet()) return 0;
+
     TRACE("(%d, %d, %p, %d)\n", wCategory, nIndex, lpOutput, bUnicode);
-    if (gLoaded == FALSE)
-         LoadTablet();
 
     /*
      *  Handle system extents here, as we can use user32.dll code to set them.
@@ -450,6 +463,8 @@ HCTX WINAPI WTOpenW(HWND hWnd, LPLOGCONTEXTW lpLogCtx, BOOL fEnable)
 {
     LPOPENCONTEXT newcontext;
 
+    if (!LoadTablet()) return 0;
+
     TRACE("hWnd=%p, lpLogCtx=%p, fEnable=%u\n", hWnd, lpLogCtx, fEnable);
     DUMPCONTEXT(*lpLogCtx);