Refactored VignetteProcessor<TPixel>

src/ImageSharp/Processing/Processors/Overlays/VignetteProcessor{TPixel}.cs

@@ -63,14 +63,14 @@ namespace SixLabors.ImageSharp.Processing.Processors.Overlays
             using IMemoryOwner<TPixel> rowColors = allocator.Allocate<TPixel>(interest.Width);
             rowColors.GetSpan().Fill(vignetteColor);
 
-            var operation = new RowIntervalOperation(configuration, interest, rowColors, this.blender, center, maxDistance, blendPercent, source);
+            var operation = new RowOperation(configuration, interest, rowColors, this.blender, center, maxDistance, blendPercent, source);
-            ParallelRowIterator.IterateRowIntervals<RowIntervalOperation, float>(
+            ParallelRowIterator.IterateRows<RowOperation, float>(
                 configuration,
                 interest,
                 in operation);
         }
 
-        private readonly struct RowIntervalOperation : IRowIntervalOperation<float>
+        private readonly struct RowOperation : IRowOperation<float>
         {
             private readonly Configuration configuration;
             private readonly Rectangle bounds;
@@ -82,7 +82,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Overlays
             private readonly ImageFrame<TPixel> source;
 
             [MethodImpl(InliningOptions.ShortMethod)]
-            public RowIntervalOperation(
+            public RowOperation(
                 Configuration configuration,
                 Rectangle bounds,
                 IMemoryOwner<TPixel> colors,
@@ -103,12 +103,10 @@ namespace SixLabors.ImageSharp.Processing.Processors.Overlays
             }
 
             [MethodImpl(InliningOptions.ShortMethod)]
-            public void Invoke(in RowInterval rows, Span<float> span)
+            public void Invoke(int y, Span<float> span)
             {
                 Span<TPixel> colorSpan = this.colors.GetSpan();
 
-                for (int y = rows.Min; y < rows.Max; y++)
-                {
                 for (int i = 0; i < this.bounds.Width; i++)
                 {
                     float distance = Vector2.Distance(this.center, new Vector2(i + this.bounds.X, y));
@@ -127,4 +125,3 @@ namespace SixLabors.ImageSharp.Processing.Processors.Overlays
         }
     }
 }
-}