[FFmpeg-cvslog] avfilter/vf_convolution: unbreak roberts filter

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Thu May  3 11:26:40 2018 +0200| [c8c2fb097777df4869b8840de6c8a443ffe08268] | committer: Paul B Mahol

avfilter/vf_convolution: unbreak roberts filter

Signed-off-by: Paul B Mahol <onemda at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c8c2fb097777df4869b8840de6c8a443ffe08268
---

 libavfilter/vf_convolution.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavfilter/vf_convolution.c b/libavfilter/vf_convolution.c
index 2fa030dc05..f973e48a9b 100644
--- a/libavfilter/vf_convolution.c
+++ b/libavfilter/vf_convolution.c
@@ -165,8 +165,8 @@ static void filter16_roberts(uint8_t *dstp, const uint8_t *src, int width,
     int x;
 
     for (x = 0; x < width; x++) {
-        int suma = AV_RN16A(&c[0][2 * x]) *  1 + AV_RN16A(&c[4][2 * x]) * -1;
-        int sumb = AV_RN16A(&c[1][2 * x]) *  1 + AV_RN16A(&c[3][2 * x]) * -1;
+        int suma = AV_RN16A(&c[0][2 * x]) *  1 + AV_RN16A(&c[1][2 * x]) * -1;
+        int sumb = AV_RN16A(&c[4][2 * x]) *  1 + AV_RN16A(&c[3][2 * x]) * -1;
 
         dst[x] = av_clip(sqrt(suma*suma + sumb*sumb) * scale + delta, 0, peak);
     }
@@ -215,8 +215,8 @@ static void filter_roberts(uint8_t *dst, const uint8_t *src, int width,
     int x;
 
     for (x = 0; x < width; x++) {
-        int suma = c[0][x - 1] *  1 + c[4][x    ] * -1;
-        int sumb = c[1][x    ] *  1 + c[3][x - 1] * -1;
+        int suma = c[0][x] *  1 + c[1][x] * -1;
+        int sumb = c[4][x] *  1 + c[3][x] * -1;
 
         dst[x] = av_clip_uint8(sqrt(suma*suma + sumb*sumb) * scale + delta);
     }