From 10cd23d51fbfc99d6e3e401440eebb56df3b3327 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Thu, 21 Sep 2006 15:17:59 -0700
Subject: [PATCH] Fix infinite-join test case (bug #8379)

The trick for this was to carefully ensure that the pen always has
at least 4 vertices. There was a previous attempt at this in the
code already but the test case had a combination of matrix and radius
that resulted in a value that was just able to sneak past the previous
check.
---
 src/cairo-pen.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/cairo-pen.c b/src/cairo-pen.c
index 3d42314c9..0e24f2d70 100644
--- a/src/cairo-pen.c
+++ b/src/cairo-pen.c
@@ -270,7 +270,12 @@ _cairo_pen_vertices_needed (double	    tolerance,
 	/* number of vertices must be even */
 	if (num_vertices % 2)
 	    num_vertices++;
+
+	/* And we must always have at least 4 vertices. */
+	if (num_vertices < 4)
+	    num_vertices = 4;
     }
+
     return num_vertices;
 }