From e6d8aab97490c89bc6bf10f6dcb3a78fb2135f48 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Tue, 31 Mar 2020 19:38:43 -0700
Subject: [PATCH] Don't draw backwards miters.

---
 content/src/stroke.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/content/src/stroke.rs b/content/src/stroke.rs
index 9f6d8ad2..fe1ac17e 100644
--- a/content/src/stroke.rs
+++ b/content/src/stroke.rs
@@ -383,11 +383,15 @@ impl Contour {
             LineJoin::Bevel => {}
             LineJoin::Miter(miter_limit) => {
                 if let Some(prev_tangent_t) = prev_tangent.intersection_t(next_tangent) {
+                    if prev_tangent_t < -EPSILON {
+                        return;
+                    }
                     let miter_endpoint = prev_tangent.sample(prev_tangent_t);
                     let threshold = miter_limit * distance;
-                    if (miter_endpoint - join_point).square_length() <= threshold * threshold {
-                        self.push_endpoint(miter_endpoint);
+                    if (miter_endpoint - join_point).square_length() > threshold * threshold {
+                        return;
                     }
+                    self.push_endpoint(miter_endpoint);
                 }
             }
             LineJoin::Round => {