Restart interval is now handled by scan decoder

src/ImageSharp/Formats/Jpeg/Components/Decoder/HuffmanScanDecoder.cs

@@ -22,7 +22,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder
         private JpegFrame frame;
         private JpegComponent[] components;
 
-        // The restart interval.
+        /// <summary>
+        /// The reset interval determined by RST markers.
+        /// </summary>
         private int restartInterval;
 
         // How many mcu's are left to do.
@@ -72,7 +74,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder
             this.acHuffmanTables = new HuffmanTable[maxTables];
         }
 
-        // Reset interval
+        /// <summary>
+        /// Sets reset interval determined by RST markers.
+        /// </summary>
         public int ResetInterval
         {
             set

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -42,11 +42,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// </summary>
         private readonly byte[] markerBuffer = new byte[2];
 
-        /// <summary>
-        /// The reset interval determined by RST markers.
-        /// </summary>
-        private ushort resetInterval;
-
         /// <summary>
         /// Whether the image has an EXIF marker.
         /// </summary>
@@ -1001,7 +996,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 JpegThrowHelper.ThrowBadMarker(nameof(JpegConstants.Markers.DRI), remaining);
             }
 
-            this.resetInterval = this.ReadUint16(stream);
+            this.scanDecoder.ResetInterval = this.ReadUint16(stream);
         }
 
         /// <summary>
@@ -1052,9 +1047,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             // All the comments below are for separate refactoring PR
             // Main reason it's not fixed here is to make this commit less intrusive
 
-            // This can be injectd in DRI marker callback
-            this.scanDecoder.ResetInterval = this.resetInterval;
-
             // This can be passed as ParseEntropyCodedData() parameter as it is used only there
             this.scanDecoder.ComponentsLength = selectorsCount;