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Diffstat (limited to 'x11-libs/agg/files/2.5/0014-Avoid-potential-zero-division-resulting-in-nan-in-ag.patch')
-rw-r--r--x11-libs/agg/files/2.5/0014-Avoid-potential-zero-division-resulting-in-nan-in-ag.patch30
1 files changed, 30 insertions, 0 deletions
diff --git a/x11-libs/agg/files/2.5/0014-Avoid-potential-zero-division-resulting-in-nan-in-ag.patch b/x11-libs/agg/files/2.5/0014-Avoid-potential-zero-division-resulting-in-nan-in-ag.patch
new file mode 100644
index 000000000..547b0d218
--- /dev/null
+++ b/x11-libs/agg/files/2.5/0014-Avoid-potential-zero-division-resulting-in-nan-in-ag.patch
@@ -0,0 +1,30 @@
+From 6433a64f4cd41e88499386b0b7c7ae05d30683b8 Mon Sep 17 00:00:00 2001
+From: Tom Hughes <tom@compton.nu>
+Date: Sat, 22 Jun 2013 12:33:32 +0100
+Subject: [PATCH 14/15] Avoid potential zero division resulting in nan in
+ agg::gamma_linear
+
+---
+ include/agg_gamma_functions.h | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/include/agg_gamma_functions.h b/include/agg_gamma_functions.h
+index fa38a45..beb0c04 100644
+--- a/include/agg_gamma_functions.h
++++ b/include/agg_gamma_functions.h
+@@ -94,7 +94,11 @@ namespace agg
+ {
+ if(x < m_start) return 0.0;
+ if(x > m_end) return 1.0;
+- return (x - m_start) / (m_end - m_start);
++ double delta = m_end - m_start;
++ // avoid nan from potential zero division
++ // https://github.com/mapnik/mapnik/issues/761
++ if (delta <= 0.0) return 0.0;
++ return (x - m_start) / delta;
+ }
+
+ private:
+--
+1.8.1.4
+