From 82b04158866bae42d13950db310542e1171fb36e Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Sun, 16 Jun 2019 20:42:07 +0200
Subject: [PATCH] Clip small linewidths in agg

---
 src/_backend_agg.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/_backend_agg.h b/src/_backend_agg.h
index 55af1950773f..b8536258fa6b 100644
--- a/src/_backend_agg.h
+++ b/src/_backend_agg.h
@@ -406,6 +406,11 @@ RendererAgg::_draw_path(path_t &path, bool has_clippath, const facepair_t &face,
         double linewidth = points_to_pixels(gc.linewidth);
         if (!gc.isaa) {
             linewidth = (linewidth < 0.5) ? 0.5 : mpl_round(linewidth);
+        } else {
+            // Too small linewidths are forced to zero because they require a
+            // lot of computation and do not make sense even with antialiasing.
+            // Compare github #14498.
+            linewidth = (linewidth < 0.001) ? 0 : mpl_round(linewidth);
         }
         if (gc.dashes.size() == 0) {
             stroke_t stroke(path);