From a02daef7b29a796a736e97d39f9c389b2d4bd70a Mon Sep 17 00:00:00 2001
From: pylbrecht <palbrecht@mailbox.org>
Date: Mon, 2 Dec 2019 14:33:37 +0100
Subject: [PATCH] Make arc() wrap angles mod 2pi

---
 components/canvas/raqote_backend.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/components/canvas/raqote_backend.rs b/components/canvas/raqote_backend.rs
index ba1b5f99700..b940277a0f3 100644
--- a/components/canvas/raqote_backend.rs
+++ b/components/canvas/raqote_backend.rs
@@ -488,10 +488,17 @@ impl GenericPathBuilder for PathBuilder {
         &mut self,
         origin: Point2D<f32>,
         radius: f32,
-        start_angle: f32,
+        mut start_angle: f32,
         mut end_angle: f32,
         anticlockwise: bool,
     ) {
+        if (!anticlockwise && start_angle > end_angle + 2. * PI) ||
+            (anticlockwise && end_angle > start_angle + 2. * PI)
+        {
+            start_angle = start_angle % (2. * PI);
+            end_angle = end_angle % (2. * PI);
+        }
+
         if (anticlockwise && end_angle > 0.) || (!anticlockwise && end_angle < 0.) {
             end_angle = -end_angle;
         }