Add COMPOSITE change to fbCopyWindow (not needed yet)

Xnest was half-using midispcur and doing a bad job of it. Replace all of
    that code with mipointer which does a lot of the work.
Support DDXen which don't provide GetWindowPixmap, or which return NULL for
    the root pixmap.

fb/fbwindow.c

@@ -1,4 +1,4 @@
-/* $XdotOrg$ */
+/* $XdotOrg: xc/programs/Xserver/fb/fbwindow.c,v 1.2 2004/04/23 19:05:14 eich Exp $ */
 /*
  * Id: fbwindow.c,v 1.1 1999/11/02 03:54:45 keithp Exp $
  *
@@ -123,6 +123,9 @@ fbCopyWindow(WindowPtr	    pWin,
     RegionRec	rgnDst;
     int		dx, dy;
     WindowPtr	pwinRoot;
+#ifdef COMPOSITE
+    PixmapPtr	pPixmap = fbGetWindowPixmap (pWin);
+#endif
 
     pwinRoot = WindowTable[pWin->drawable.pScreen->myNum];
 
@@ -134,6 +137,12 @@ fbCopyWindow(WindowPtr	    pWin,
     
     REGION_INTERSECT(pWin->drawable.pScreen, &rgnDst, &pWin->borderClip, prgnSrc);
 
+#ifdef COMPOSITE
+    if (pPixmap->screen_x || pPixmap->screen_y)
+	REGION_TRANSLATE (pWin->drawable.pScreen, &rgnDst, 
+			  -pPixmap->screen_x, -pPixmap->screen_y);
+#endif
+
     fbCopyRegion ((DrawablePtr)pwinRoot, (DrawablePtr)pwinRoot,
 		  0,
 		  &rgnDst, dx, dy, fbCopyWindowProc, 0, 0);