From: mmd-osm <mmd.osm@gmail.com>
Date: Wed, 3 Apr 2019 17:12:45 +0000 (+0200)
Subject: Skip gif animation optimization in case both frames are identical
X-Git-Tag: live~2592^2~4
X-Git-Url: https://git.openstreetmap.org/rails.git/commitdiff_plain/7f138fb014e201e9e6b63ababf57d0f7c53bd86c

Skip gif animation optimization in case both frames are identical
This works around an issue in libgd2 library which would otherwise
cause segfaults due to zero sized images
---

diff --git a/lib/gpx.rb b/lib/gpx.rb
index 4580421ba..f3e0c0e26 100644
--- a/lib/gpx.rb
+++ b/lib/gpx.rb
@@ -103,7 +103,9 @@ module GPX
       res = GD2::AnimatedGif.gif_anim_begin(frames[0])
       res << GD2::AnimatedGif.gif_anim_add(frames[0], nil, delay)
       (1...nframes).each do |n|
-        res << GD2::AnimatedGif.gif_anim_add(frames[n], frames[n - 1], delay)
+        res << GD2::AnimatedGif.gif_anim_add(frames[n],
+                                             (frames[n] == frames[n - 1] ? nil : frames[n - 1]),
+                                             delay)
       end
       res << GD2::AnimatedGif.gif_anim_end