Make decoder options init only (except Configuration cos tests)

src/ImageSharp/Formats/Bmp/BmpDecoderOptions.cs

@@ -9,11 +9,11 @@ namespace SixLabors.ImageSharp.Formats.Bmp;
 public sealed class BmpDecoderOptions : ISpecializedDecoderOptions
 {
     /// <inheritdoc/>
-    public DecoderOptions GeneralOptions { get; set; } = new();
+    public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
 
     /// <summary>
-    /// Gets or sets the value indicating how to deal with skipped pixels,
+    /// Gets the value indicating how to deal with skipped pixels,
     /// which can occur during decoding run length encoded bitmaps.
     /// </summary>
-    public RleSkippedPixelHandling RleSkippedPixelHandling { get; set; }
+    public RleSkippedPixelHandling RleSkippedPixelHandling { get; init; }
 }

src/ImageSharp/Formats/DecoderOptions.cs

@@ -21,27 +21,27 @@ public sealed class DecoderOptions
     internal static DecoderOptions Default { get; } = LazyOptions.Value;
 
     /// <summary>
-    /// Gets or sets a custom Configuration instance to be used by the image processing pipeline.
+    /// Gets a custom configuration instance to be used by the image processing pipeline.
     /// </summary>
-    public Configuration Configuration { get; set; } = Configuration.Default;
+    public Configuration Configuration { get; internal set; } = Configuration.Default;
 
     /// <summary>
-    /// Gets or sets the target size to decode the image into.
+    /// Gets the target size to decode the image into.
     /// </summary>
-    public Size? TargetSize { get; set; }
+    public Size? TargetSize { get; init; }
 
     /// <summary>
-    /// Gets or sets the sampler to use when resizing during decoding.
+    /// Gets the sampler to use when resizing during decoding.
     /// </summary>
-    public IResampler Sampler { get; set; } = KnownResamplers.Box;
+    public IResampler Sampler { get; init; } = KnownResamplers.Box;
 
     /// <summary>
-    /// Gets or sets a value indicating whether to ignore encoded metadata when decoding.
+    /// Gets a value indicating whether to ignore encoded metadata when decoding.
     /// </summary>
-    public bool SkipMetadata { get; set; }
+    public bool SkipMetadata { get; init; }
 
     /// <summary>
-    /// Gets or sets the maximum number of image frames to decode, inclusive.
+    /// Gets the maximum number of image frames to decode, inclusive.
     /// </summary>
-    public uint MaxFrames { get => this.maxFrames; set => this.maxFrames = Math.Clamp(value, 1, int.MaxValue); }
+    public uint MaxFrames { get => this.maxFrames; init => this.maxFrames = Math.Clamp(value, 1, int.MaxValue); }
 }

src/ImageSharp/Formats/ISpecializedDecoderOptions.cs

@@ -9,7 +9,7 @@ namespace SixLabors.ImageSharp.Formats;
 public interface ISpecializedDecoderOptions
 {
     /// <summary>
-    /// Gets or sets the general decoder options.
+    /// Gets the general decoder options.
     /// </summary>
-    DecoderOptions GeneralOptions { get; set; }
+    DecoderOptions GeneralOptions { get; init; }
 }

src/ImageSharp/Formats/Jpeg/JpegDecoderOptions.cs

@@ -8,11 +8,11 @@ namespace SixLabors.ImageSharp.Formats.Jpeg;
 /// </summary>
 public sealed class JpegDecoderOptions : ISpecializedDecoderOptions
 {
+    /// <inheritdoc/>
+    public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
+
     /// <summary>
-    /// Gets or sets the resize mode.
+    /// Gets the resize mode.
     /// </summary>
-    public JpegDecoderResizeMode ResizeMode { get; set; }
-
-    /// <inheritdoc/>
-    public DecoderOptions GeneralOptions { get; set; } = new();
+    public JpegDecoderResizeMode ResizeMode { get; init; }
 }

tests/ImageSharp.Benchmarks/Codecs/Jpeg/DecodeJpegParseStreamOnly.cs

@@ -37,8 +37,7 @@ public class DecodeJpegParseStreamOnly
     {
         using var memoryStream = new MemoryStream(this.jpegBytes);
         using var bufferedStream = new BufferedReadStream(Configuration.Default, memoryStream);
-        var options = new JpegDecoderOptions();
-        options.GeneralOptions.SkipMetadata = true;
+        var options = new JpegDecoderOptions() { GeneralOptions = new() { SkipMetadata = true } };
 
         using var decoder = new JpegDecoderCore(options);
         var spectralConverter = new NoopSpectralConverter();

tests/ImageSharp.Tests/TestFormat.cs

@@ -230,7 +230,7 @@ public class TestFormat : IConfigurationModule, IImageFormat
 
     public class TestDecoderOptions : ISpecializedDecoderOptions
     {
-        public DecoderOptions GeneralOptions { get; set; } = new();
+        public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
     }
 
     public class TestEncoder : ImageEncoder

tests/ImageSharp.Tests/TestUtilities/Tests/TestImageProviderTests.cs

@@ -429,15 +429,15 @@ public class TestImageProviderTests
 
     private class TestDecoderOptions : ISpecializedDecoderOptions
     {
-        public DecoderOptions GeneralOptions { get; set; } = new();
+        public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
     }
 
     private class TestDecoderWithParametersOptions : ISpecializedDecoderOptions
     {
-        public string Param1 { get; set; }
+        public string Param1 { get; init; }
 
-        public int Param2 { get; set; }
+        public int Param2 { get; init; }
 
-        public DecoderOptions GeneralOptions { get; set; } = new();
+        public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
     }
 }