From 942510f5a4b19ffea58cf5d81e642a9097a73250 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Fri, 18 May 2018 20:58:32 +1000
Subject: [PATCH 1/2] No need for SpanHelper now.

---
 .../Formats/Png/Filters/NoneFilter.cs         |  5 +-
 src/ImageSharp/Memory/SpanHelper.cs           | 48 -------------------
 2 files changed, 2 insertions(+), 51 deletions(-)
 delete mode 100644 src/ImageSharp/Memory/SpanHelper.cs

diff --git a/src/ImageSharp/Formats/Png/Filters/NoneFilter.cs b/src/ImageSharp/Formats/Png/Filters/NoneFilter.cs
index 14af8ca6a..97e16ef23 100644
--- a/src/ImageSharp/Formats/Png/Filters/NoneFilter.cs
+++ b/src/ImageSharp/Formats/Png/Filters/NoneFilter.cs
@@ -3,7 +3,6 @@
 
 using System;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.Memory;
 
 namespace SixLabors.ImageSharp.Formats.Png.Filters
 {
@@ -25,7 +24,7 @@ namespace SixLabors.ImageSharp.Formats.Png.Filters
             // Insert a byte before the data.
             result[0] = 0;
             result = result.Slice(1);
-            SpanHelper.Copy(scanline, result);
+            scanline.Slice(0, Math.Min(scanline.Length, result.Length)).CopyTo(result);
         }
     }
-}
+}
\ No newline at end of file
diff --git a/src/ImageSharp/Memory/SpanHelper.cs b/src/ImageSharp/Memory/SpanHelper.cs
deleted file mode 100644
index 592e2a885..000000000
--- a/src/ImageSharp/Memory/SpanHelper.cs
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the Apache License, Version 2.0.
-
-using System;
-using System.Runtime.CompilerServices;
-
-namespace SixLabors.ImageSharp.Memory
-{
-    /// <summary>
-    /// Utility methods for <see cref="Span{T}"/>
-    /// </summary>
-    internal static class SpanHelper
-    {
-        /// <summary>
-        /// Copy all elements of 'source' into 'destination'.
-        /// </summary>
-        /// <typeparam name="T">The element type.</typeparam>
-        /// <param name="source">The <see cref="Span{T}"/> to copy elements from.</param>
-        /// <param name="destination">The destination <see cref="Span{T}"/>.</param>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Copy<T>(ReadOnlySpan<T> source, Span<T> destination)
-            where T : struct
-        {
-            source.Slice(0, Math.Min(source.Length, destination.Length)).CopyTo(destination);
-        }
-
-        /// <summary>
-        /// Gets the size of `count` elements in bytes.
-        /// </summary>
-        /// <typeparam name="T">The element type.</typeparam>
-        /// <param name="count">The count of the elements</param>
-        /// <returns>The size in bytes as int</returns>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static int SizeOf<T>(int count)
-            where T : struct => Unsafe.SizeOf<T>() * count;
-
-        /// <summary>
-        /// Gets the size of `count` elements in bytes as UInt32
-        /// </summary>
-        /// <typeparam name="T">The element type.</typeparam>
-        /// <param name="count">The count of the elements</param>
-        /// <returns>The size in bytes as UInt32</returns>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static uint USizeOf<T>(int count)
-            where T : struct
-            => (uint)SizeOf<T>(count);
-    }
-}
\ No newline at end of file

From 27b1f59bdb0c7d928a085fc321f43546645f6499 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Tue, 22 May 2018 00:50:54 +1000
Subject: [PATCH 2/2] Try preview environment

---
 appveyor.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/appveyor.yml b/appveyor.yml
index f784ef287..9b1ce2b95 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,5 +1,5 @@
 version: 1.0.0.{build}
-image: Visual Studio 2017
+image: Visual Studio 2017 Preview
 
 # prevent the double build when a branch has an active PR
 skip_branch_with_pr: true