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avfilter/vf_v360: call tanf() once

This commit is contained in:
Paul B Mahol 2019-09-14 13:33:24 +02:00
parent cb8d6a4e3e
commit f78abca0c2
1 changed files with 3 additions and 3 deletions
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6
libavfilter/vf_v360.c
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@ -2142,11 +2142,11 @@ static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int p)
static void fov_from_dfov(V360Context *s, float w, float h)
{
const float d_angle = 0.5 * FFMIN(s->d_fov, 359.f) * M_PI / 180.f;
const float da = tanf(0.5 * FFMIN(s->d_fov, 359.f) * M_PI / 180.f);
const float d = hypotf(w, h);
s->h_fov = atan2f(tanf(d_angle) * w, d) * 360.f / M_PI;
s->v_fov = atan2f(tanf(d_angle) * h, d) * 360.f / M_PI;
s->h_fov = atan2f(da * w, d) * 360.f / M_PI;
s->v_fov = atan2f(da * h, d) * 360.f / M_PI;
if (s->h_fov < 0.f)
s->h_fov += 360.f;