From 29c6d32ecafe61075e399827afbcd491209fe963 Mon Sep 17 00:00:00 2001
From: Unknown <peter.wendorff@gmx.de>
Date: Thu, 26 Apr 2018 19:39:01 +0200
Subject: [PATCH] improve performance on distance calculation

---
 .../Brushes/GradientBrushes/EllipticGradientBrush.cs       | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp.Drawing/Processing/Drawing/Brushes/GradientBrushes/EllipticGradientBrush.cs b/src/ImageSharp.Drawing/Processing/Drawing/Brushes/GradientBrushes/EllipticGradientBrush.cs
index 9be54358cb..8986853e27 100644
--- a/src/ImageSharp.Drawing/Processing/Drawing/Brushes/GradientBrushes/EllipticGradientBrush.cs
+++ b/src/ImageSharp.Drawing/Processing/Drawing/Brushes/GradientBrushes/EllipticGradientBrush.cs
@@ -154,7 +154,12 @@ namespace SixLabors.ImageSharp.Processing.Drawing.Brushes.GradientBrushes
                 PointF p1,
                 PointF p2)
             {
-                return (float)Math.Sqrt(Math.Pow(p1.X - p2.X, 2) + Math.Pow(p1.Y - p2.Y, 2));
+                float dX = p1.X - p2.X;
+                float dXsquared = dX * dX;
+
+                float dY = p1.Y - p2.Y;
+                float dYsquared = dY * dY;
+                return (float)Math.Sqrt(dXsquared + dYsquared);
             }
         }
     }