From 3dd7c8ea41709173759b02eff4c51268eb2c9f33 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Tue, 9 Nov 2021 20:55:23 +0100
Subject: [PATCH] Remove unnecessary Clear() and scratch buffer

---
 src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs   | 4 ++--
 src/ImageSharp/Formats/Webp/Lossy/Vp8Histogram.cs | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs b/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
index 19a71c3e5..cb839559f 100644
--- a/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
+++ b/src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs
@@ -127,7 +127,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
 #if SUPPORTS_RUNTIME_INTRINSICS
             if (Sse41.IsSupported)
             {
-                int diffSum = TTransformSse41(a, b, w, scratch);
+                int diffSum = TTransformSse41(a, b, w);
                 return Math.Abs(diffSum) >> 5;
             }
             else
@@ -654,7 +654,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
         /// Returns the weighted sum of the absolute value of transformed coefficients.
         /// w[] contains a row-major 4 by 4 symmetric matrix.
         /// </summary>
-        public static int TTransformSse41(Span<byte> inputA, Span<byte> inputB, Span<ushort> w, Span<int> scratch)
+        public static int TTransformSse41(Span<byte> inputA, Span<byte> inputB, Span<ushort> w)
         {
             // Load and combine inputs.
             Vector128<byte> ina0 = Unsafe.As<byte, Vector128<byte>>(ref MemoryMarshal.GetReference(inputA));
diff --git a/src/ImageSharp/Formats/Webp/Lossy/Vp8Histogram.cs b/src/ImageSharp/Formats/Webp/Lossy/Vp8Histogram.cs
index 7192fa2d0..6e724e475 100644
--- a/src/ImageSharp/Formats/Webp/Lossy/Vp8Histogram.cs
+++ b/src/ImageSharp/Formats/Webp/Lossy/Vp8Histogram.cs
@@ -49,7 +49,6 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
             this.distribution.AsSpan().Clear();
             for (j = startBlock; j < endBlock; j++)
             {
-                this.output.AsSpan().Clear();
                 this.Vp8FTransform(reference.Slice(WebpLookupTables.Vp8DspScan[j]), pred.Slice(WebpLookupTables.Vp8DspScan[j]), this.output);
 
                 // Convert coefficients to bin.