From http://www.jwz.org/xscreensaver/xscreensaver-5.30.tar.gz

[xscreensaver] / hacks / xlockmore.c

diff --git a/hacks/xlockmore.c b/hacks/xlockmore.c
index c90be11f87f3f7c39fbc0eff9ccd8fe384756598..d5b71f9bb4f956b595cd1daf50b3a6d324117bd4 100644 (file)
--- a/hacks/xlockmore.c
+++ b/hacks/xlockmore.c
@@ -294,12 +294,26 @@ xlockmore_init (Display *dpy, Window window,
   
 #ifdef HAVE_COCOA
   
+# if 0
   /* In Cocoa-based xscreensaver, all hacks run in the same address space,
      so each one needs to get its own screen number.  Believe what jwxyz
      says about screen counts and numbers.
    */
   mi->num_screens = ScreenCount (dpy);
   mi->screen_number = XScreenNumberOfScreen (mi->xgwa.screen);
+# else
+  /* No, that doesn't work.
+     The xlockmore docs/HACKERS.GUIDE says that xlock modes are supposed to
+     support repeated calls to init_*() for the same screen in the same
+     session, but in practice, a number of them blow up if you do that.
+     So instead we're stuck with a world where on OSX/iOS, we have to
+     increment the screen number every time the hack is run. Arrgh.
+   */
+  mi->num_screens = 40;
+  mi->screen_number = xlmft->screen_count;
+  if (mi->screen_number >= mi->num_screens) abort();
+  xlmft->screen_count++;
+# endif
   root_p = True;
 
 #else /* !HAVE_COCOA -- real Xlib */