From 906dc08d3e415835422daf1dcdf03a2b6edda1c3 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 22 Jul 2011 11:42:22 +0200
Subject: Fix crash when no root pixmap is set

---
 lib/Phi/X11.hs | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/Phi/X11.hs b/lib/Phi/X11.hs
index f0cf62c..23c6c62 100644
--- a/lib/Phi/X11.hs
+++ b/lib/Phi/X11.hs
@@ -252,6 +252,7 @@ updateRootImage disp = do
       rootwin = defaultRootWindow disp
   pixmap <- liftM (fromIntegral . fromMaybe 0 . listToMaybe . join . catMaybes) $ forM [atom_XROOTPMAP_ID atoms, atom_XROOTMAP_ID atoms] $
             \atom -> liftIO $ getWindowProperty32 disp atom rootwin
+  
   (_, _, _, rootWidth, rootHeight, _, _) <- liftIO $ getGeometry disp rootwin
   
   -- update surface size
@@ -264,13 +265,15 @@ updateRootImage disp = do
     modify $ \state -> state { phiRootImage = newBg }
   
   bg <- gets phiRootImage
-  rootSurface <- liftIO $ Util.createXlibSurface disp pixmap visual (fromIntegral rootWidth) (fromIntegral rootHeight)
-  
-  renderWith bg $ withPatternForSurface rootSurface $ \pattern -> do
-    setSource pattern
-    paint
   
-  surfaceFinish rootSurface
+  when (pixmap /= 0) $ do
+    rootSurface <- liftIO $ Util.createXlibSurface disp pixmap visual (fromIntegral rootWidth) (fromIntegral rootHeight)
+    
+    renderWith bg $ withPatternForSurface rootSurface $ \pattern -> do
+      setSource pattern
+      paint
+    
+    surfaceFinish rootSurface
 
 
 createPanel :: Display -> Window -> [Widget.WidgetState] -> Rectangle -> PhiX PanelState
-- 
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