From fe0fdc51b56e061ee00ef237c218e18b99468878 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Fri, 23 Mar 2018 16:21:38 +0100
Subject: [PATCH] avfilter/vf_convolution: disable fast path if rdiv/bias are
 different from defaults

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavfilter/vf_convolution.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavfilter/vf_convolution.c b/libavfilter/vf_convolution.c
index d7f8bf8a65..ce09e338cc 100644
--- a/libavfilter/vf_convolution.c
+++ b/libavfilter/vf_convolution.c
@@ -997,6 +997,9 @@ static av_cold int init(AVFilterContext *ctx)
             } else {
                 return AVERROR(EINVAL);
             }
+
+            if (s->copy[i] && (s->rdiv[i] != 1. || s->bias[i] != 0.))
+                s->copy[i] = 0;
         }
     } else if (!strcmp(ctx->filter->name, "prewitt")) {
         for (i = 0; i < 4; i++) {