Add Pad

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Former-commit-id: e5c6fd1bbbf94f02f2702a09dfd16fba18662352
Former-commit-id: bf339f877e151c783b9d462b133429e9dc28aeb3

src/ImageProcessorCore/Samplers/Pad.cs

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+// <copyright file="Pad.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>-------------------------------------------------------------------------------------------------------------------
+
+namespace ImageProcessorCore
+{
+    using Processors;
+
+    /// <summary>
+    /// Extension methods for the <see cref="Image"/> type.
+    /// </summary>
+    public static partial class ImageExtensions
+    {
+        /// <summary>
+        /// Evenly pads an image to fit the new dimensions.
+        /// </summary>
+        /// <typeparam name="T">The pixel format.</typeparam>
+        /// <typeparam name="TP">The packed format. <example>long, float.</example></typeparam>
+        /// <param name="source">The source image to pad.</param>
+        /// <param name="width">The new width.</param>
+        /// <param name="height">The new height.</param>
+        /// <param name="progressHandler">A delegate which is called as progress is made processing the image.</param>
+        /// <returns>The <see cref="Image"/>.</returns>
+        public static Image<T, TP> Pad<T, TP>(this Image<T, TP> source, int width, int height, ProgressEventHandler progressHandler = null)
+            where T : IPackedVector<TP>
+            where TP : struct
+        {
+            ResizeOptions options = new ResizeOptions
+            {
+                Size = new Size(width, height),
+                Mode = ResizeMode.BoxPad,
+                Sampler = new NearestNeighborResampler()
+            };
+
+            return Resize(source, options, progressHandler);
+        }
+    }
+}