Color transformations

MrMeeseeks.Test/Extensions/ColorExtensionsTests.cs

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+using System.Collections.Generic;
+using System.Drawing;
+using MrMeeseeks.Extensions;
+using Xunit;
+
+namespace MrMeeseeks.Test.Extensions
+{
+    public class ColorExtensionsTests
+    {
+        public static IEnumerable<object[]> ToLongData => 
+            new [] {
+                new [] {
+                    (object) Color.Red, 16711680
+                },
+                new [] {
+                    (object) Color.Blue, 255
+                },
+                new [] {
+                    (object) Color.Green, 32768
+                },
+                new [] {
+                    (object) Color.Purple, 8388736
+                },
+            };
+
+        [Theory]
+        [MemberData(nameof(ToLongData))]
+        public void ToLong_GivenColor_ExpectedLong(Color color, long expected)
+        {
+            // Arrange
+
+            // Act
+            var result = color.ToLong();
+
+            // Assert
+            Assert.Equal(expected, result);
+        }
+    }
+}

MrMeeseeks/Extensions/ColorExtensions.cs

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+using System.Drawing;
+
+namespace MrMeeseeks.Extensions
+{
+    public static class ColorExtensions
+    {
+        public static long ToLong(this Color color)
+        {
+            long ret = color.A << 24 + color.R << 16 + color.G << 8 + color.B << 0;
+            ret <<= 8;
+            ret += color.R;
+            ret <<= 8;
+            ret += color.G;
+            ret <<= 8;
+            ret += color.B;
+            return ret;
+        }
+    }
+}

MrMeeseeks/Extensions/LongExtensions.cs

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+using System.Drawing;
+
+namespace MrMeeseeks.Extensions
+{
+    public static class LongExtensions
+    {
+        public static Color ToColor(this long number) =>
+            Color.FromArgb(
+                (byte) (number >> 24 & 0xff),
+                (byte) (number >> 16 & 0xff),
+                (byte) (number >> 8 & 0xff),
+                (byte) (number & 0xff));
+    }
+}