31 lines
973 B
Diff
31 lines
973 B
Diff
From 6433a64f4cd41e88499386b0b7c7ae05d30683b8 Mon Sep 17 00:00:00 2001
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From: Tom Hughes <tom@compton.nu>
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Date: Sat, 22 Jun 2013 12:33:32 +0100
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Subject: [PATCH 14/15] Avoid potential zero division resulting in nan in
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agg::gamma_linear
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---
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include/agg_gamma_functions.h | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/include/agg_gamma_functions.h b/include/agg_gamma_functions.h
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index fa38a45..beb0c04 100644
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--- a/include/agg_gamma_functions.h
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+++ b/include/agg_gamma_functions.h
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@@ -94,7 +94,11 @@ namespace agg
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{
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if(x < m_start) return 0.0;
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if(x > m_end) return 1.0;
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- return (x - m_start) / (m_end - m_start);
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+ double delta = m_end - m_start;
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+ // avoid nan from potential zero division
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+ // https://github.com/mapnik/mapnik/issues/761
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+ if (delta <= 0.0) return 0.0;
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+ return (x - m_start) / delta;
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}
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private:
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--
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1.8.1.4
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