From 34481a645a7d7d257a3e0f661ba25e49da4993b7 Mon Sep 17 00:00:00 2001
From: Peter Amrehn <peter.wendorff@gmx.de>
Date: Sun, 4 Nov 2018 16:02:54 +0100
Subject: [PATCH] avoid local variable copy when the original is never changed

---
 src/ImageSharp/Formats/Png/PngScanlineProcessor.cs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Png/PngScanlineProcessor.cs b/src/ImageSharp/Formats/Png/PngScanlineProcessor.cs
index 3fe590ee24..420775eca9 100644
--- a/src/ImageSharp/Formats/Png/PngScanlineProcessor.cs
+++ b/src/ImageSharp/Formats/Png/PngScanlineProcessor.cs
@@ -190,12 +190,11 @@ namespace SixLabors.ImageSharp.Formats.Png
             else
             {
                 Rgba32 rgba32 = default;
-                int bps = bytesPerSample;
                 for (int x = 0; x < header.Width; x++)
                 {
                     int offset = x * bytesPerPixel;
                     byte luminance = Unsafe.Add(ref scanlineSpanRef, offset);
-                    byte alpha = Unsafe.Add(ref scanlineSpanRef, offset + bps);
+                    byte alpha = Unsafe.Add(ref scanlineSpanRef, offset + bytesPerSample);
 
                     rgba32.R = luminance;
                     rgba32.G = luminance;