Fixed out of range exception for baseline tests

tests/ImageSharp.Tests/Formats/Jpg/Utils/LibJpegTools.ComponentData.cs

@@ -58,17 +58,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
 
             public void LoadSpectralStride(Buffer2D<Block8x8> data, int strideIndex)
             {
-                for (int y = 0; y < data.Height; y++)
+                int startIndex = strideIndex * data.Height;
+
+                int endIndex = Math.Min(this.HeightInBlocks, startIndex + data.Height);
+
+                for (int y = startIndex; y < endIndex; y++)
                 {
-                    Span<Block8x8> blockRow = data.GetRowSpan(y);
-                    for (int x = 0; x < data.Width; x++)
+                    Span<Block8x8> blockRow = data.GetRowSpan(y - startIndex);
+                    for (int x = 0; x < this.WidthInBlocks; x++)
                     {
                         short[] block = blockRow[x].ToArray();
 
                         // x coordinate stays the same - we load entire stride
                         // y coordinate is tricky as we load single stride to full buffer - offset is needed
-                        int yOffset = strideIndex * data.Height;
-                        this.MakeBlock(block, y + yOffset, x);
+                        this.MakeBlock(block, y, x);
                     }
                 }
             }
@@ -76,10 +79,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
             public void LoadSpectral(JpegComponent c)
             {
                 Buffer2D<Block8x8> data = c.SpectralBlocks;
-                for (int y = 0; y < c.HeightInBlocks; y++)
+                for (int y = 0; y < this.HeightInBlocks; y++)
                 {
                     Span<Block8x8> blockRow = data.GetRowSpan(y);
-                    for (int x = 0; x < c.WidthInBlocks; x++)
+                    for (int x = 0; x < this.WidthInBlocks; x++)
                     {
                         short[] block = blockRow[x].ToArray();
                         this.MakeBlock(block, y, x);
@@ -94,16 +97,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
                     c.HeightInBlocks,
                     index);
 
-                for (int y = 0; y < result.HeightInBlocks; y++)
-                {
-                    Span<Block8x8> blockRow = c.SpectralBlocks.GetRowSpan(y);
-                    for (int x = 0; x < result.WidthInBlocks; x++)
-                    {
-                        short[] data = blockRow[x].ToArray();
-                        result.MakeBlock(data, y, x);
-                    }
-                }
-
+                result.LoadSpectral(c);
                 return result;
             }