Add explicit AOT seeding for SpectralConverter

Author: JimBobSquarePants

src/ImageSharp/Advanced/AotCompilerTools.cs

@@ -10,11 +10,13 @@
 using SixLabors.ImageSharp.Formats.Gif;
 using SixLabors.ImageSharp.Formats.Jpeg;
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
+using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder;
 using SixLabors.ImageSharp.Formats.Pbm;
 using SixLabors.ImageSharp.Formats.Png;
 using SixLabors.ImageSharp.Formats.Qoi;
 using SixLabors.ImageSharp.Formats.Tga;
 using SixLabors.ImageSharp.Formats.Tiff;
+using SixLabors.ImageSharp.Formats.Tiff.Compression.Decompressors;
 using SixLabors.ImageSharp.Formats.Webp;
 using SixLabors.ImageSharp.Memory;
 using SixLabors.ImageSharp.PixelFormats;
@@ -130,6 +132,7 @@ private static void Seed<TPixel>()
         AotCompileImageDecoderInternals<TPixel>();
         AotCompileImageEncoders<TPixel>();
         AotCompileImageDecoders<TPixel>();
+        AotCompileSpectralConverter<TPixel>();
         AotCompileImageProcessors<TPixel>();
         AotCompileGenericImageProcessors<TPixel>();
         AotCompileResamplers<TPixel>();
@@ -269,6 +272,17 @@ private static void AotCompileImageDecoders<TPixel>()
         AotCompileImageDecoder<TPixel, TiffDecoder>();
     }
 
+    [Preserve]
+    private static void AotCompileSpectralConverter<TPixel>()
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        default(SpectralConverter<TPixel>).GetPixelBuffer(default);
+        default(GrayJpegSpectralConverter<TPixel>).GetPixelBuffer(default);
+        default(RgbJpegSpectralConverter<TPixel>).GetPixelBuffer(default);
+        default(TiffJpegSpectralConverter<TPixel>).GetPixelBuffer(default);
+        default(TiffOldJpegSpectralConverter<TPixel>).GetPixelBuffer(default);
+    }
+
     /// <summary>
     /// This method pre-seeds the <see cref="IImageEncoder"/> in the AoT compiler.
     /// </summary>