pr comment fix

Author: RobertMut

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -523,7 +523,7 @@ public void Dispose()
     /// <param name="markerContentByteSize">The remaining bytes in the segment block.</param>
     private void ProcessComMarker(BufferedReadStream stream, int markerContentByteSize)
     {
-        Span<byte> temp = stackalloc byte[markerContentByteSize];
+        Span<byte> temp = new byte[markerContentByteSize];
         char[] chars = new char[markerContentByteSize];
         JpegMetadata metadata = this.Metadata.GetFormatMetadata(JpegFormat.Instance);
 

src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs

@@ -185,7 +185,7 @@ private void WriteComment(JpegMetadata metadata)
         // Length (comment strings lengths) + (comments markers with payload sizes)
         int commentsBytes = metadata.Comments.Sum(x => x.Length) + (metadata.Comments.Count * 4);
         int commentStart = 0;
-        Span<byte> commentBuffer = stackalloc byte[commentsBytes];
+        Span<byte> commentBuffer = new byte[commentsBytes];
 
         foreach (Memory<char> comment in metadata.Comments)
         {

tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.Metadata.cs

@@ -137,7 +137,7 @@ public void Encode_PreserveRatio(string imagePath, int xResolution, int yResolut
     [MemberData(nameof(QualityFiles))]
     public void Encode_PreservesQuality(string imagePath, int quality)
     {
-        var testFile = TestFile.Create(imagePath);
+        TestFile testFile = TestFile.Create(imagePath);
         using (Image<Rgba32> input = testFile.CreateRgba32Image())
         {
             using (var memStream = new MemoryStream())
@@ -160,15 +160,15 @@ public void Encode_PreservesComments<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         // arrange
-        using var input = provider.GetImage(JpegDecoder.Instance);
+        using Image<TPixel> input = provider.GetImage(JpegDecoder.Instance);
         using var memStream = new MemoryStream();
 
         // act
         input.Save(memStream, JpegEncoder);
 
         // assert
         memStream.Position = 0;
-        using var output = Image.Load<Rgba32>(memStream);
+        using Image<Rgba32> output = Image.Load<Rgba32>(memStream);
         JpegMetadata actual = output.Metadata.GetJpegMetadata();
         Assert.NotEmpty(actual.Comments);
         Assert.Equal(1, actual.Comments.Count);
@@ -190,7 +190,7 @@ public void Encode_SavesMultipleComments()
 
         // assert
         memStream.Position = 0;
-        using var output = Image.Load<Rgba32>(memStream);
+        using Image<Rgba32> output = Image.Load<Rgba32>(memStream);
         JpegMetadata actual = output.Metadata.GetJpegMetadata();
         Assert.NotEmpty(actual.Comments);
         Assert.Equal(2, actual.Comments?.Count);