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[FFmpeg-devel] vf_v360: fix visibility test for fisheye projection

Message ID 20210319094204.926251-1-daniel.playfair.cal@gmail.com
State New
Headers show
Series [FFmpeg-devel] vf_v360: fix visibility test for fisheye projection
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Commit Message

Daniel Playfair Cal March 19, 2021, 9:42 a.m. UTC
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.

Signed-off-by: Daniel Playfair Cal <daniel.playfair.cal@gmail.com>
---
 libavfilter/vf_v360.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Moritz Barsnick March 19, 2021, 10:19 a.m. UTC | #1
On Fri, Mar 19, 2021 at 20:42:04 +1100, Daniel Playfair Cal wrote:
> -    const int visible = hypotf(uf, vf) <= 0.5f;
> +    const int visible = -0.5 < uf && uf < 0.5 && -0.5 < vf && vf < 0.5;

Please avoid double constants in float expressions, they propagate the
whole calculation to a double. I.e. use "0.5f" instead of "0.5".

(Also in one of your other patches.)

Cheers,
Moritz
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Patch

diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c
index 94473cd5b3..602e0e2d72 100644
--- a/libavfilter/vf_v360.c
+++ b/libavfilter/vf_v360.c
@@ -2887,7 +2887,7 @@  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 = -0.5 < uf && uf < 0.5 && -0.5 < vf && vf < 0.5;
     int ui, vi;
 
     uf = (uf + 0.5f) * width;