[FFmpeg-cvslog] avfilter/vf_v360: fix visibility test for fisheye projection

[Daniel Playfair Cal]

ffmpeg | branch: master | Daniel Playfair Cal <daniel.playfair.cal at gmail.com> | Sat Jul 17 11:28:56 2021 +0200| [7f6d20931b1b14031f585610a8d81a86368ab46d] | committer: Paul B Mahol

avfilter/vf_v360: fix visibility test for fisheye projection

Previously the visibility test referred to a circle in the input. This
changes it so that it refers accurately to the entire area in the input.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7f6d20931b1b14031f585610a8d81a86368ab46d
---

 libavfilter/vf_v360.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c
index 0c47883d4d..c5c4e3bf65 100644
--- a/libavfilter/vf_v360.c
+++ b/libavfilter/vf_v360.c
@@ -2926,7 +2926,7 @@ static int xyz_to_fisheye(const V360Context *s,
     float uf = vec[0] / lh * phi / s->iflat_range[0];
     float vf = vec[1] / lh * phi / s->iflat_range[1];
 
-    const int visible = hypotf(uf, vf) <= 0.5f;
+    const int visible = -0.5f < uf && uf < 0.5f && -0.5f < vf && vf < 0.5f;
     int ui, vi;
 
     uf = (uf + 0.5f) * width;