Added IconWriteDefines.

Author: dlemstra

src/Magick.NET/Formats/Icon/IconWriteDefines.cs

@@ -0,0 +1,35 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+using System.Collections.Generic;
+
+namespace ImageMagick.Formats;
+
+/// <summary>
+/// Class for defines that are used when a <see cref="MagickFormat.Jp2"/> image is written.
+/// </summary>
+public sealed class IconWriteDefines : IWriteDefines
+{
+    /// <summary>
+    /// Gets or sets a value indicating whether automatic resizing is enabled.
+    /// </summary>
+    public bool? AutoResize { get; set; }
+
+    /// <summary>
+    /// Gets the format where the defines are for.
+    /// </summary>
+    public MagickFormat Format
+        => MagickFormat.Icon;
+
+    /// <summary>
+    /// Gets the defines that should be set as a define on an image.
+    /// </summary>
+    public IEnumerable<IDefine> Defines
+    {
+        get
+        {
+            if (AutoResize.HasValue)
+                yield return new MagickDefine(Format, "auto-resize", AutoResize.Value);
+        }
+    }
+}

tests/Magick.NET.Tests/Formats/Icon/IconWriteDefinesTests/TheAutoResizeProperty.cs

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+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+using ImageMagick;
+using ImageMagick.Formats;
+using Xunit;
+
+namespace Magick.NET.Tests;
+
+public partial class IconWriteDefinesTests
+{
+    public class TheAutoResizeProperty
+    {
+        [Fact]
+        public void ShouldSetTheDefine()
+        {
+            var defines = new IconWriteDefines
+            {
+                AutoResize = true,
+            };
+
+            using var image = new MagickImage();
+            image.Settings.SetDefines(defines);
+
+            Assert.Equal("true", image.Settings.GetDefine(MagickFormat.Icon, "auto-resize"));
+        }
+
+        [Fact]
+        public void ShouldEncodeTheImageIn8bitWhenNotSet()
+        {
+            var defines = new IconWriteDefines
+            {
+                AutoResize = false,
+            };
+
+            using var image = new MagickImage();
+            image.Settings.SetDefines(defines);
+
+            Assert.Equal("false", image.Settings.GetDefine(MagickFormat.Icon, "auto-resize"));
+        }
+    }
+}

tests/Magick.NET.Tests/Formats/Icon/IconWriteDefinesTests/TheConstructor.cs

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+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+using ImageMagick;
+using ImageMagick.Formats;
+using Xunit;
+
+namespace Magick.NET.Tests;
+
+public partial class IconWriteDefinesTests
+{
+    public class TheConstructor
+    {
+        [Fact]
+        public void ShouldNotSetAnyDefines()
+        {
+            using var image = new MagickImage();
+            image.Settings.SetDefines(new IconWriteDefines());
+
+            Assert.Null(image.Settings.GetDefine(MagickFormat.Icon, "auto-resize"));
+        }
+    }
+}