From b8ddfe725a183f57ffcd516ec7618fbf000f372e Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Tue, 10 Apr 2018 23:05:30 +1000
Subject: [PATCH] ref zigzag

---
 .../Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs b/src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs
index 43e3ef435..af0b20eb5 100644
--- a/src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs
+++ b/src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs
@@ -759,7 +759,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
                     break;
                 }
 
-                byte z = PdfJsQuantizationTables.DctZigZag[k];
+                ref byte z = ref PdfJsQuantizationTables.DctZigZag[k];
                 short re = (short)this.ReceiveAndExtend(s, stream);
                 Unsafe.Add(ref blockDataRef, offset + z) = re;
                 k++;
@@ -842,7 +842,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
 
             while (k <= e)
             {
-                byte z = PdfJsQuantizationTables.DctZigZag[k];
+                ref byte z = ref PdfJsQuantizationTables.DctZigZag[k];
                 switch (this.successiveACState)
                 {
                     case 0: // Initial state