From: Rui Ueyama <ruiu@google.com>
Date: Mon, 23 Jun 2014 00:29:56 +0000 (+1000)
Subject: image/png: remove unnecessary function call
X-Git-Tag: go1.4beta1~1240
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=9cddb486433bfb3e149df98f2940b25b00b8ed52;p=gostls13.git

image/png: remove unnecessary function call

paeth(0, x, 0) == x for any uint8 value.

LGTM=nigeltao
R=golang-codereviews, bradfitz, nigeltao
CC=golang-codereviews
https://golang.org/cl/105290049
---

diff --git a/src/pkg/image/png/writer.go b/src/pkg/image/png/writer.go
index 629452cbfa..5c232b760a 100644
--- a/src/pkg/image/png/writer.go
+++ b/src/pkg/image/png/writer.go
@@ -188,7 +188,7 @@ func filter(cr *[nFilter][]byte, pr []byte, bpp int) int {
 	// The Paeth filter.
 	sum = 0
 	for i := 0; i < bpp; i++ {
-		cdat4[i] = cdat0[i] - paeth(0, pdat[i], 0)
+		cdat4[i] = cdat0[i] - pdat[i]
 		sum += abs8(cdat4[i])
 	}
 	for i := bpp; i < n; i++ {