--- rxvt-unicode/src/rxvttoolkit.h	2007/12/26 14:22:30	1.40
+++ rxvt-unicode/src/rxvttoolkit.h	2008/01/23 05:59:30	1.42
@@ -75,7 +75,7 @@
   XA_XEMBED_INFO,
 #endif
 #if !ENABLE_MINIMAL
-  // these are usually allocated by other subsystens, but we do it
+  // these are usually allocated by other subsystems, but we do it
   // here to avoid a server roundtrip.
   XA_SCREEN_RESOURCES,
   XA_XDCCC_LINEAR_RGB_CORRECTION,
@@ -331,6 +331,16 @@
   bool operator == (const rxvt_color &b) const { return Pixel (*this) == Pixel (b); }
   bool operator != (const rxvt_color &b) const { return Pixel (*this) != Pixel (b); }
 
+  bool is_opaque () const
+  {
+#if XFT
+    //TODO: only supports 24 bit truecolour
+    return c.color.alpha < 0xff00;
+#else
+    return 1;
+#endif
+  }
+
   bool alloc (rxvt_screen *screen, const rgba &color);
   void free (rxvt_screen *screen);