From 78a9e9e0b883fdca9c0fe49d8819000452ad49f1 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Tue, 30 May 2017 15:55:11 +1000
Subject: [PATCH] Alpha

---
 .../Processing/Effects/AlphaTest.cs           | 53 +++++++++++++++++
 .../Processors/Filters/AlphaTest.cs           | 57 -------------------
 2 files changed, 53 insertions(+), 57 deletions(-)
 create mode 100644 tests/ImageSharp.Tests/Processing/Effects/AlphaTest.cs
 delete mode 100644 tests/ImageSharp.Tests/Processors/Filters/AlphaTest.cs

diff --git a/tests/ImageSharp.Tests/Processing/Effects/AlphaTest.cs b/tests/ImageSharp.Tests/Processing/Effects/AlphaTest.cs
new file mode 100644
index 0000000000..a25e48ac38
--- /dev/null
+++ b/tests/ImageSharp.Tests/Processing/Effects/AlphaTest.cs
@@ -0,0 +1,53 @@
+// <copyright file="AlphaTest.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Tests.Processing.Effects
+{
+    using ImageSharp.PixelFormats;
+
+    using Xunit;
+
+    public class AlphaTest : FileTestBase
+    {
+        public static readonly TheoryData<float> AlphaValues
+        = new TheoryData<float>
+        {
+            20/100F,
+            80/100F
+        };
+
+        [Theory]
+        [WithFileCollection(nameof(DefaultFiles), nameof(AlphaValues), StandardPixelType)]
+        public void ImageShouldApplyAlphaFilter<TPixel>(TestImageProvider<TPixel> provider, float value)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Alpha(value)
+                    .DebugSave(provider, value, Extensions.Png);
+            }
+        }
+
+        [Theory]
+        [WithFileCollection(nameof(DefaultFiles), nameof(AlphaValues), StandardPixelType)]
+        public void ImageShouldApplyAlphaFilterInBox<TPixel>(TestImageProvider<TPixel> provider, float value)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            using (Image<TPixel> source = provider.GetImage())
+            using (var image = new Image<TPixel>(source))
+            {
+                var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
+
+                image.Alpha(value, bounds)
+                    .DebugSave(provider, value, Extensions.Png);
+
+                // Draw identical shapes over the bounded and compare to ensure changes are constrained.
+                image.Fill(NamedColors<TPixel>.HotPink, bounds);
+                source.Fill(NamedColors<TPixel>.HotPink, bounds);
+                ImageComparer.CheckSimilarity(image, source);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/ImageSharp.Tests/Processors/Filters/AlphaTest.cs b/tests/ImageSharp.Tests/Processors/Filters/AlphaTest.cs
deleted file mode 100644
index 401ac916bd..0000000000
--- a/tests/ImageSharp.Tests/Processors/Filters/AlphaTest.cs
+++ /dev/null
@@ -1,57 +0,0 @@
-// <copyright file="AlphaTest.cs" company="James Jackson-South">
-// Copyright (c) James Jackson-South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageSharp.Tests
-{
-    using System.IO;
-
-    using ImageSharp.PixelFormats;
-
-    using Xunit;
-
-    public class AlphaTest : FileTestBase
-    {
-        public static readonly TheoryData<float> AlphaValues
-        = new TheoryData<float>
-        {
-            20/100f ,
-            80/100f
-        };
-
-        [Theory]
-        [MemberData(nameof(AlphaValues))]
-        public void ImageShouldApplyAlphaFilter(float value)
-        {
-            string path = this.CreateOutputDirectory("Alpha");
-
-            foreach (TestFile file in Files)
-            {
-                string filename = file.GetFileName(value);
-                using (Image<Rgba32> image = file.CreateImage())
-                using (FileStream output = File.OpenWrite($"{path}/{filename}"))
-                {
-                    image.Alpha(value).Save(output);
-                }
-            }
-        }
-
-        [Theory]
-        [MemberData(nameof(AlphaValues))]
-        public void ImageShouldApplyAlphaFilterInBox(float value)
-        {
-            string path = this.CreateOutputDirectory("Alpha");
-
-            foreach (TestFile file in Files)
-            {
-                string filename = file.GetFileName(value + "-InBox");
-                using (Image<Rgba32> image = file.CreateImage())
-                using (FileStream output = File.OpenWrite($"{path}/{filename}"))
-                {
-                    image.Alpha(value, new Rectangle(10, 10, image.Width / 2, image.Height / 2)).Save(output);
-                }
-            }
-        }
-    }
-}
\ No newline at end of file