From 4540b426521d024a7e87a1e84d23c66ae7ca6eff Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Thu, 28 Jul 2016 13:45:19 +1000
Subject: [PATCH] BlackWhite

Former-commit-id: 08361487c9988e874329dee40c21725ae6cc3a90
Former-commit-id: da89003e33f7ab41ee727e787c39d898af0b1e8d
Former-commit-id: 7e90879b76b3a162d664e2c5bb0cd782e6dd6e77
---
 src/ImageProcessorCore/Filters/BlackWhite.cs  | 58 +++++++++++++++++++
 .../Processors/Filters/BlackWhiteTest.cs      | 38 ++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 src/ImageProcessorCore/Filters/BlackWhite.cs
 create mode 100644 tests/ImageProcessorCore.Tests/Processors/Filters/BlackWhiteTest.cs

diff --git a/src/ImageProcessorCore/Filters/BlackWhite.cs b/src/ImageProcessorCore/Filters/BlackWhite.cs
new file mode 100644
index 000000000..8799cfe64
--- /dev/null
+++ b/src/ImageProcessorCore/Filters/BlackWhite.cs
@@ -0,0 +1,58 @@
+// <copyright file="BlackWhite.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{T,TP}"/> type.
+    /// </summary>
+    public static partial class ImageExtensions
+    {
+        /// <summary>
+        /// Applies black and white toning to the image.
+        /// </summary>
+        /// <typeparam name="T">The pixel format.</typeparam>
+        /// <typeparam name="TP">The packed format. <example>long, float.</example></typeparam>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="progressHandler">A delegate which is called as progress is made processing the image.</param>
+        /// <returns>The <see cref="Image{T,TP}"/>.</returns>
+        public static Image<T, TP> BlackWhite<T, TP>(this Image<T, TP> source, ProgressEventHandler progressHandler = null)
+            where T : IPackedVector<TP>
+            where TP : struct
+        {
+            return BlackWhite(source, source.Bounds, progressHandler);
+        }
+
+        /// <summary>
+        /// Applies black and white toning to the image.
+        /// </summary>
+        /// <typeparam name="T">The pixel format.</typeparam>
+        /// <typeparam name="TP">The packed format. <example>long, float.</example></typeparam>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="rectangle">
+        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to alter.
+        /// </param>
+        /// <param name="progressHandler">A delegate which is called as progress is made processing the image.</param>
+        /// <returns>The <see cref="Image{T,TP}"/>.</returns>
+        public static Image<T, TP> BlackWhite<T, TP>(this Image<T, TP> source, Rectangle rectangle, ProgressEventHandler progressHandler = null)
+            where T : IPackedVector<TP>
+            where TP : struct
+        {
+            BlackWhiteProcessor<T, TP> processor = new BlackWhiteProcessor<T, TP>();
+            processor.OnProgress += progressHandler;
+
+            try
+            {
+                return source.Process(rectangle, processor);
+            }
+            finally
+            {
+                processor.OnProgress -= progressHandler;
+            }
+        }
+    }
+}
diff --git a/tests/ImageProcessorCore.Tests/Processors/Filters/BlackWhiteTest.cs b/tests/ImageProcessorCore.Tests/Processors/Filters/BlackWhiteTest.cs
new file mode 100644
index 000000000..c40224ef7
--- /dev/null
+++ b/tests/ImageProcessorCore.Tests/Processors/Filters/BlackWhiteTest.cs
@@ -0,0 +1,38 @@
+// <copyright file="BlackWhiteTest.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageProcessorCore.Tests
+{
+    using System.IO;
+
+    using Xunit;
+
+    public class BlackWhiteTest : FileTestBase
+    {
+        [Fact]
+        public void ImageShouldApplyBlackWhiteFilter()
+        {
+            const string path = "TestOutput/BlackWhite";
+            if (!Directory.Exists(path))
+            {
+                Directory.CreateDirectory(path);
+            }
+
+            foreach (string file in Files)
+            {
+                using (FileStream stream = File.OpenRead(file))
+                {
+                    string filename = Path.GetFileName(file);
+                    Image image = new Image(stream);
+                    using (FileStream output = File.OpenWrite($"{path}/{filename}"))
+                    {
+                        image.BlackWhite()
+                             .Save(output);
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file