--- rxvt-unicode/src/rxvttoolkit.C	2012/01/13 12:40:53	1.130
+++ rxvt-unicode/src/rxvttoolkit.C	2012/06/03 15:50:22	1.132
@@ -432,10 +432,11 @@
 #ifdef LOCAL_X_IS_UNIX
   if (id[0] == ':')
     {
-      if (!(val = rxvt_temp_buf<char> (5 + strlen (id) + 1)))
-        return false;
+      char *val = rxvt_temp_buf<char> (5 + strlen (id) + 1);
+
       strcpy (val, "unix/");
       strcat (val, id);
+
       dpy = XOpenDisplay (val);
     }
   else
@@ -467,6 +468,28 @@
   XUnloadFont (dpy, f);
 #endif
 
+  flags = 0;
+#if XRENDER
+  int major, minor;
+  if (XRenderQueryVersion (dpy, &major, &minor))
+    {
+      flags |= DISPLAY_HAS_RENDER;
+
+      if (major > 0 || (major == 0 && minor >= 11))
+        flags |= DISPLAY_HAS_RENDER_MUL;
+
+      XFilters *filters = XRenderQueryFilters (dpy, root);
+      if (filters)
+        {
+          for (int i = 0; i < filters->nfilter; i++)
+            if (!strcmp (filters->filter[i], FilterConvolution))
+              flags |= DISPLAY_HAS_RENDER_CONV;
+
+          XFree (filters);
+        }
+    }
+#endif
+
   int fd = XConnectionNumber (dpy);
 
   // try to detect whether we have a local connection.