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avfilter/vf_v360: simplify xyz_to_ball() calculations

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This commit is contained in:
Paul B Mahol 2019-09-21 16:07:16 +02:00
parent b8dfc108a2
commit ecaef69fbb
1 changed files with 4 additions and 3 deletions
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7
libavfilter/vf_v360.c
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@ -1603,12 +1603,13 @@ static void xyz_to_ball(const V360Context *s,
uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)
{
const float l = hypotf(vec[0], vec[1]);
const float r = sinf(acosf(-vec[2]) * 0.5f);
const float r = sqrtf(1.f + vec[2]) / M_SQRT2;
float uf, vf;
int ui, vi;
uf = (1.f - r * vec[0] * s->input_mirror_modifier[0] / l) * width / 2.f;
vf = (1.f + r * vec[1] * s->input_mirror_modifier[1] / l) * height / 2.f;
uf = (1.f + r * vec[0] * s->input_mirror_modifier[0] / (l > 0.f ? l : 1.f)) * width * 0.5f;
vf = (1.f - r * vec[1] * s->input_mirror_modifier[1] / (l > 0.f ? l : 1.f)) * height * 0.5f;
ui = floorf(uf);
vi = floorf(vf);