--- xorg-server-1.6.3/composite/compalloc.c	2009-07-07 13:48:57.000000000 -0400
+++ xorg-server-1.6.3-backclear/composite/compalloc.c	2009-09-09 11:55:03.000000000 -0400
@@ -483,65 +483,33 @@
     
     pPixmap->screen_x = x;
     pPixmap->screen_y = y;
-    
-    if (pParent->drawable.depth == pWin->drawable.depth)
-    {
-	GCPtr	pGC = GetScratchGC (pWin->drawable.depth, pScreen);
-	
-	/*
-	 * Copy bits from the parent into the new pixmap so that it will
-	 * have "reasonable" contents in case for background None areas.
-	 */
-	if (pGC)
-	{
-	    XID val = IncludeInferiors;
-	    
-	    ValidateGC(&pPixmap->drawable, pGC);
-	    dixChangeGC (serverClient, pGC, GCSubwindowMode, &val, NULL);
-	    (*pGC->ops->CopyArea) (&pParent->drawable,
-				   &pPixmap->drawable,
-				   pGC,
-				   x - pParent->drawable.x,
-				   y - pParent->drawable.y,
-				   w, h, 0, 0);
-	    FreeScratchGC (pGC);
-	}
-    }
-    else
+
     {
-	PictFormatPtr	pSrcFormat = compWindowFormat (pParent);
-	PictFormatPtr	pDstFormat = compWindowFormat (pWin);
+        /*
+         * Initialize new backing pixmap as fully transparent.
+         */
+        PictFormatPtr   pDstFormat = compWindowFormat (pWin);
 	XID		inferiors = IncludeInferiors;
 	int		error;
 
-	PicturePtr	pSrcPicture = CreatePicture (None,
-						     &pParent->drawable,
-						     pSrcFormat,
-						     CPSubwindowMode,
-						     &inferiors,
-						     serverClient, &error);
-						    
 	PicturePtr	pDstPicture = CreatePicture (None,
 						     &pPixmap->drawable,
 						     pDstFormat,
 						     0, 0,
 						     serverClient, &error);
 
-	if (pSrcPicture && pDstPicture)
+	if (pDstPicture)
 	{
-	    CompositePicture (PictOpSrc,
-			      pSrcPicture,
+	    CompositePicture (PictOpClear,
+			      pDstPicture,
 			      NULL,
 			      pDstPicture,
-			      x - pParent->drawable.x,
-			      y - pParent->drawable.y,
-			      0, 0, 0, 0, w, h);
+			      0, 0, 0, 0, 0, 0, w, h);
 	}
-	if (pSrcPicture)
-	    FreePicture (pSrcPicture, 0);
 	if (pDstPicture)
 	    FreePicture (pDstPicture, 0);
     }
+
     return pPixmap;
 }