http://ftp.x.org/contrib/applications/xscreensaver-2.16.tar.gz

[xscreensaver] / driver / windows.c

diff --git a/driver/windows.c b/driver/windows.c
index 06c0bb4ecb865413585fbb1de208c719ac969927..7a938c5a53a7f394bc4c605c0aed99c0238041c6 100644 (file)
--- a/driver/windows.c
+++ b/driver/windows.c
@@ -1,5 +1,5 @@
 /* windows.c --- turning the screen black; dealing with visuals, virtual roots.
- * xscreensaver, Copyright (c) 1991-1997 Jamie Zawinski <jwz@netscape.com>
+ * xscreensaver, Copyright (c) 1991-1998 Jamie Zawinski <jwz@netscape.com>
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -822,6 +822,10 @@ raise_window (saver_info *si,
          current_maps[i] = (between_hacks_p
                             ? ssi->cmap
                             : DefaultColormapOfScreen (ssi->screen));
+         /* Ensure that the default background of the window is really black,
+            not a pixmap or something.  (This does not clear the window.) */
+         XSetWindowBackground (si->dpy, ssi->screensaver_window,
+                               ssi->black_pixel);
        }
 
       if (p->verbose_p) fprintf (stderr, "%s: fading... ", progname);
@@ -941,11 +945,17 @@ unblank_screen (saver_info *si)
        {
          saver_screen_info *ssi = &si->screens[i];
          current_windows[i] = ssi->screensaver_window;
+         /* Ensure that the default background of the window is really black,
+            not a pixmap or something.  (This does not clear the window.) */
+         XSetWindowBackground (si->dpy, ssi->screensaver_window,
+                               ssi->black_pixel);
        }
 
       if (p->verbose_p) fprintf (stderr, "%s: unfading... ", progname);
 
+      XSync (si->dpy, False);
       XGrabServer (si->dpy);
+      XSync (si->dpy, False);
       for (i = 0; i < si->nscreens; i++)
        {
          saver_screen_info *ssi = &si->screens[i];
@@ -955,6 +965,7 @@ unblank_screen (saver_info *si)
          clear_stderr (ssi);
        }
       XUngrabServer (si->dpy);
+      XSync (si->dpy, False);
 
       fade_screens (si->dpy, 0, current_windows,
                    p->fade_seconds, p->fade_ticks,
@@ -1025,6 +1036,13 @@ unblank_screen (saver_info *si)
     }
 #endif
 
+  /* Unmap the windows a second time, dammit -- just to avoid a race
+     with the screen-grabbing hacks.  (I'm not sure if this is really
+     necessary; I'm stabbing in the dark now.)
+  */
+  for (i = 0; i < si->nscreens; i++)
+    XUnmapWindow (si->dpy, si->screens[i].screensaver_window);
+
   si->screen_blanked_p = False;
 }