From 1f467220cfd1664782b1fe210bbc9342ad460fd2 Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefasab@gmail.com>
Date: Fri, 7 Dec 2012 18:36:58 +0100
Subject: [PATCH] lavfi/alphaextract: drop cur_linesize = out_linesize branch
 in draw_slice()

The code causes uninitialized data copy, and may be actually slower than
a loop over each line in case the padding is big.
---
 libavfilter/vf_alphaextract.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/libavfilter/vf_alphaextract.c b/libavfilter/vf_alphaextract.c
index 35402f656d..e779c9832d 100644
--- a/libavfilter/vf_alphaextract.c
+++ b/libavfilter/vf_alphaextract.c
@@ -77,11 +77,6 @@ static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
                 pin += 4;
             }
         }
-    } else if (cur_buf->linesize[A] == out_buf->linesize[Y]) {
-        const int linesize = cur_buf->linesize[A];
-        memcpy(out_buf->data[Y] + y0 * linesize,
-               cur_buf->data[A] + y0 * linesize,
-               linesize * h);
     } else {
         const int linesize = FFMIN(out_buf->linesize[Y], cur_buf->linesize[A]);
         int y;