From http://www.jwz.org/xscreensaver/xscreensaver-5.39.tar.gz

[xscreensaver] / hacks / compass.c

diff --git a/hacks/compass.c b/hacks/compass.c
index 9d62870f6d163be6a6107a588f43930ee97019b8..1dc1d3ea7a4ccbda961e9c9abf94dc6ca5f73bb2 100644 (file)
--- a/hacks/compass.c
+++ b/hacks/compass.c
@@ -1,4 +1,4 @@
-/* xscreensaver, Copyright (c) 1999 Jamie Zawinski <jwz@jwz.org>
+/* xscreensaver, Copyright (c) 1999-2018 Jamie Zawinski <jwz@jwz.org>
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -833,7 +833,11 @@ compass_init (Display *dpy, Window window)
       st->xgwa.height > st->xgwa.width * 5)
     st->size2 = MAX(st->xgwa.width, st->xgwa.height);
 
-  if (st->size2 > 600) st->size2 = 600;
+  {
+    int max = 600;
+    if (st->xgwa.width > 2560) max *= 2;  /* Retina displays */
+    if (st->size2 > max) st->size2 = max;
+  }
 
   st->size = (st->size2 / 2) * 0.8;