From 68424083165e62e341e4e464c02664b8b66b75d2 Mon Sep 17 00:00:00 2001
From: Xavier Cho <mysticfallband@gmail.com>
Date: Thu, 12 Sep 2019 12:55:28 +0900
Subject: [PATCH] Ignore invalid gradient positions rather than throwing an
 error

There can be such cases where it fails to find intersection points for
a given position, especially when the polygon is small.

Such an input would result in an error previously, but now it renders
correctly.
---
 src/ImageSharp.Drawing/Processing/PathGradientBrush.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ImageSharp.Drawing/Processing/PathGradientBrush.cs b/src/ImageSharp.Drawing/Processing/PathGradientBrush.cs
index 553ed181c..636551b64 100644
--- a/src/ImageSharp.Drawing/Processing/PathGradientBrush.cs
+++ b/src/ImageSharp.Drawing/Processing/PathGradientBrush.cs
@@ -237,6 +237,11 @@ namespace SixLabors.ImageSharp.Processing
 
                     (Edge edge, Intersection? info) = this.FindIntersection(point, end);
 
+                    if (!info.HasValue)
+                    {
+                        return Color.Transparent.ToPixel<TPixel>();
+                    }
+
                     PointF intersection = info.Value.Point;
 
                     Vector4 edgeColor = edge.ColorAt(intersection);