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lavfi/vf_v360: implement output mask for barrelsplit

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The top/bottom of the barrel are each coded as two semicircles inside a
square block in the frame. Mask out the parts of the square that lie
outside of these semicircles, so they are made transparent when
alpha_mask=1.

Fixes the other part of #9725.
This commit is contained in:
Anton Khirnov 2022-05-19 15:36:44 +02:00
parent 83a5ef5113
commit fa26e17747
1 changed files with 5 additions and 1 deletions
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6
libavfilter/vf_v360.c
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@ -3744,6 +3744,7 @@ static int barrelsplit_to_xyz(const V360Context *s,
const float x = (i + 0.5f) / width;
const float y = (j + 0.5f) / height;
float l_x, l_y, l_z;
int ret;
if (x < 2.f / 3.f) {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;
@ -3762,6 +3763,8 @@ static int barrelsplit_to_xyz(const V360Context *s,
l_x = cos_theta * sin_phi;
l_y = sin_theta;
l_z = cos_theta * cos_phi;
ret = 1;
} else {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;
@ -3787,13 +3790,14 @@ static int barrelsplit_to_xyz(const V360Context *s,
l_x = (0.5f - uf) / scalew;
l_y = 0.5f * dir_vert;
l_z = (vf - 0.5f) * dir_vert / scaleh;
ret = (l_x * l_x * scalew * scalew + l_z * l_z * scaleh * scaleh) < 0.5f * 0.5f;
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
return 1;
return ret;
}
/**