Expose non-nullable configuration to remove AOT limiting null check

src/ImageSharp/Advanced/AdvancedImageExtensions.cs

@@ -27,25 +27,25 @@ public static IImageEncoder DetectEncoder(this Image source, string filePath)
         Guard.NotNull(filePath, nameof(filePath));
 
         string ext = Path.GetExtension(filePath);
-        if (!source.GetConfiguration().ImageFormatsManager.TryFindFormatByFileExtension(ext, out IImageFormat? format))
+        if (!source.Configuration.ImageFormatsManager.TryFindFormatByFileExtension(ext, out IImageFormat? format))
         {
             StringBuilder sb = new();
             sb = sb.AppendLine(CultureInfo.InvariantCulture, $"No encoder was found for extension '{ext}'. Registered encoders include:");
-            foreach (IImageFormat fmt in source.GetConfiguration().ImageFormats)
+            foreach (IImageFormat fmt in source.Configuration.ImageFormats)
             {
                 sb = sb.AppendFormat(CultureInfo.InvariantCulture, " - {0} : {1}{2}", fmt.Name, string.Join(", ", fmt.FileExtensions), Environment.NewLine);
             }
 
             throw new UnknownImageFormatException(sb.ToString());
         }
 
-        IImageEncoder? encoder = source.GetConfiguration().ImageFormatsManager.GetEncoder(format);
+        IImageEncoder? encoder = source.Configuration.ImageFormatsManager.GetEncoder(format);
 
         if (encoder is null)
         {
             StringBuilder sb = new();
             sb = sb.AppendLine(CultureInfo.InvariantCulture, $"No encoder was found for extension '{ext}' using image format '{format.Name}'. Registered encoders include:");
-            foreach (KeyValuePair<IImageFormat, IImageEncoder> enc in source.GetConfiguration().ImageFormatsManager.ImageEncoders)
+            foreach (KeyValuePair<IImageFormat, IImageEncoder> enc in source.Configuration.ImageFormatsManager.ImageEncoders)
             {
                 sb = sb.AppendFormat(CultureInfo.InvariantCulture, " - {0} : {1}{2}", enc.Key, enc.Value.GetType().Name, Environment.NewLine);
             }
@@ -76,30 +76,6 @@ public static void AcceptVisitor(this Image source, IImageVisitor visitor)
     public static Task AcceptVisitorAsync(this Image source, IImageVisitorAsync visitor, CancellationToken cancellationToken = default)
         => source.AcceptAsync(visitor, cancellationToken);
 
-    /// <summary>
-    /// Gets the configuration for the image.
-    /// </summary>
-    /// <param name="source">The source image.</param>
-    /// <returns>Returns the configuration.</returns>
-    public static Configuration GetConfiguration(this Image source)
-        => GetConfiguration((IConfigurationProvider)source);
-
-    /// <summary>
-    /// Gets the configuration for the image frame.
-    /// </summary>
-    /// <param name="source">The source image.</param>
-    /// <returns>Returns the configuration.</returns>
-    public static Configuration GetConfiguration(this ImageFrame source)
-        => GetConfiguration((IConfigurationProvider)source);
-
-    /// <summary>
-    /// Gets the configuration.
-    /// </summary>
-    /// <param name="source">The source image</param>
-    /// <returns>Returns the bounds of the image</returns>
-    private static Configuration GetConfiguration(IConfigurationProvider source)
-        => source?.Configuration ?? Configuration.Default;
-
     /// <summary>
     /// Gets the representation of the pixels as a <see cref="IMemoryGroup{T}"/> containing the backing pixel data of the image
     /// stored in row major order, as a list of contiguous <see cref="Memory{T}"/> blocks in the source image's pixel format.
@@ -167,12 +143,4 @@ public static Memory<TPixel> DangerousGetPixelRowMemory<TPixel>(this Image<TPixe
 
         return source.Frames.RootFrame.PixelBuffer.GetSafeRowMemory(rowIndex);
     }
-
-    /// <summary>
-    /// Gets the <see cref="MemoryAllocator"/> assigned to 'source'.
-    /// </summary>
-    /// <param name="source">The source image.</param>
-    /// <returns>Returns the configuration.</returns>
-    internal static MemoryAllocator GetMemoryAllocator(this IConfigurationProvider source)
-        => GetConfiguration(source).MemoryAllocator;
 }

src/ImageSharp/Advanced/IConfigurationProvider.cs

@@ -6,7 +6,7 @@ namespace SixLabors.ImageSharp.Advanced;
 /// <summary>
 /// Defines the contract for objects that can provide access to configuration.
 /// </summary>
-internal interface IConfigurationProvider
+public interface IConfigurationProvider
 {
     /// <summary>
     /// Gets the configuration which allows altering default behaviour or extending the library.

src/ImageSharp/Formats/Bmp/BmpEncoder.cs

@@ -32,7 +32,7 @@ public sealed class BmpEncoder : QuantizingImageEncoder
     /// <inheritdoc/>
     protected override void Encode<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken)
     {
-        BmpEncoderCore encoder = new(this, image.GetMemoryAllocator());
+        BmpEncoderCore encoder = new(this, image.Configuration.MemoryAllocator);
         encoder.Encode(image, stream, cancellationToken);
     }
 }

src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs

@@ -119,7 +119,7 @@ public void Encode<TPixel>(Image<TPixel> image, Stream stream, CancellationToken
         Guard.NotNull(image, nameof(image));
         Guard.NotNull(stream, nameof(stream));
 
-        Configuration configuration = image.GetConfiguration();
+        Configuration configuration = image.Configuration;
         ImageMetadata metadata = image.Metadata;
         BmpMetadata bmpMetadata = metadata.GetBmpMetadata();
         this.bitsPerPixel ??= bmpMetadata.BitsPerPixel;

src/ImageSharp/Formats/Gif/GifEncoder.cs

@@ -18,7 +18,7 @@ public sealed class GifEncoder : QuantizingImageEncoder
     /// <inheritdoc/>
     protected override void Encode<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken)
     {
-        GifEncoderCore encoder = new(image.GetConfiguration(), this);
+        GifEncoderCore encoder = new(image.Configuration, this);
         encoder.Encode(image, stream, cancellationToken);
     }
 }

src/ImageSharp/Formats/Gif/GifEncoderCore.cs

@@ -189,7 +189,7 @@ private void EncodeAdditionalFrames<TPixel>(
         // This frame is reused to store de-duplicated pixel buffers.
         // This is more expensive memory-wise than de-duplicating indexed buffer but allows us to deduplicate
         // frames using both local and global palettes.
-        using ImageFrame<TPixel> encodingFrame = new(previousFrame.GetConfiguration(), previousFrame.Size());
+        using ImageFrame<TPixel> encodingFrame = new(previousFrame.Configuration, previousFrame.Size());
 
         for (int i = 1; i < image.Frames.Count; i++)
         {

src/ImageSharp/Formats/ImageEncoder.cs

@@ -42,7 +42,7 @@ protected abstract void Encode<TPixel>(Image<TPixel> image, Stream stream, Cance
     private void EncodeWithSeekableStream<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken)
         where TPixel : unmanaged, IPixel<TPixel>
     {
-        Configuration configuration = image.GetConfiguration();
+        Configuration configuration = image.Configuration;
         if (stream.CanSeek)
         {
             this.Encode(image, stream, cancellationToken);
@@ -59,7 +59,7 @@ private void EncodeWithSeekableStream<TPixel>(Image<TPixel> image, Stream stream
     private async Task EncodeWithSeekableStreamAsync<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken)
         where TPixel : unmanaged, IPixel<TPixel>
     {
-        Configuration configuration = image.GetConfiguration();
+        Configuration configuration = image.Configuration;
         if (stream.CanSeek)
         {
             await DoEncodeAsync(stream).ConfigureAwait(false);