stop using linq in InternalPath

src/ImageSharp/Drawing/Paths/InternalPath.cs

@@ -32,7 +32,7 @@ namespace ImageSharp.Drawing.Paths
         /// </summary>
         /// <param name="segments">The segments.</param>
         /// <param name="isClosedPath">if set to <c>true</c> [is closed path].</param>
-        internal InternalPath(IEnumerable<ILineSegment> segments, bool isClosedPath)
+        internal InternalPath(ILineSegment[] segments, bool isClosedPath)
         {
             Guard.NotNull(segments, nameof(segments));
 
@@ -158,9 +158,15 @@ namespace ImageSharp.Drawing.Paths
             return oddNodes;
         }
 
-        private Vector2[] Simplify(IEnumerable<ILineSegment> segments)
+        private Vector2[] Simplify(ILineSegment[] segments)
         {
-            return segments.SelectMany(x => x.AsSimpleLinearPath()).ToArray();
+            List<Vector2> points = new List<Vector2>();
+            foreach(var seg in segments)
+            {
+                points.AddRange(seg.AsSimpleLinearPath());
+            }
+
+            return points.ToArray();
         }
 
         private float CalculateLength()

src/ImageSharp/Drawing/Shapes/Polygon.cs

@@ -24,15 +24,6 @@ namespace ImageSharp.Drawing.Shapes
         /// </summary>
         /// <param name="segments">The segments.</param>
         public Polygon(params ILineSegment[] segments)
-            : this((IEnumerable<ILineSegment>)segments)
-        {
-        }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Polygon"/> class.
-        /// </summary>
-        /// <param name="segments">The segments.</param>
-        public Polygon(IEnumerable<ILineSegment> segments)
         {
             this.innerPath = new InternalPath(segments, true);
             this.pathCollection = new[] { this };