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| author | Paul B Mahol <onemda@gmail.com> | 2022-05-01 19:57:44 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2022-05-01 20:02:24 +0200 |
| commit | bdf01a9609e49ff602b38826420252356d98ba2a (patch) | |
| tree | 02905b73ce963f79d636e9ca8fbc182bfa3aa801 /libavfilter/vf_overlay.c | |
| parent | 987d2c1083d9bc9464000c8732c3353c7bf7e9ca (diff) | |
| download | ffmpeg-bdf01a9609e49ff602b38826420252356d98ba2a.tar.gz | |
avfilter/vf_overlay: improve premultiplied alpha overlay for YUV
Diffstat (limited to 'libavfilter/vf_overlay.c')
| -rw-r--r-- | libavfilter/vf_overlay.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c index 685b6069a6..f560d54dae 100644 --- a/libavfilter/vf_overlay.c +++ b/libavfilter/vf_overlay.c @@ -538,12 +538,13 @@ static av_always_inline void blend_plane_##depth##_##nbits##bits(AVFilterContext if (i && yuv) \ *d = av_clip((*d * (max - alpha) + *s * alpha) / max + *s - mid, -mid, mid) + mid; \ else \ - *d = FFMIN((*d * (max - alpha) + *s * alpha) / max + *s, max); \ + *d = av_clip_uintp2((*d * (max - alpha) + *s * alpha) / max + *s - (16<<(nbits-8)),\ + nbits);\ } else { \ if (i && yuv) \ *d = av_clip(FAST_DIV255((*d - mid) * (max - alpha)) + *s - mid, -mid, mid) + mid; \ else \ - *d = FFMIN(FAST_DIV255(*d * (max - alpha)) + *s, max); \ + *d = av_clip_uint8(FAST_DIV255(*d * (255 - alpha)) + *s - 16); \ } \ } \ s++; \ |