From 98e219da4b8d18be05cd9346ed96c6a86962e801 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
Date: Sat, 7 Jun 2014 12:21:03 +0200
Subject: [PATCH] shadow-factory: Make sure to never use a negative spread

The smallest possible spread corresponds to an unblurred shadow, which
neither grows nor shrinks - thus the spread should be zero not negative
as returned by our current calculation.

https://bugzilla.gnome.org/show_bug.cgi?id=731353
---
 src/compositor/meta-shadow-factory.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/compositor/meta-shadow-factory.c b/src/compositor/meta-shadow-factory.c
index 6f02ef58b..a5bce4895 100644
--- a/src/compositor/meta-shadow-factory.c
+++ b/src/compositor/meta-shadow-factory.c
@@ -496,7 +496,12 @@ get_box_filter_size (int radius)
 static int
 get_shadow_spread (int radius)
 {
-  int d = get_box_filter_size (radius);
+  int d;
+
+  if (radius == 0)
+    return 0;
+
+  d = get_box_filter_size (radius);
 
   if (d % 2 == 1)
     return 3 * (d / 2);