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avfilter/vf_overlay: unbreak alpha composition with negative y and threads > 1

This commit is contained in:
Paul B Mahol 2021-10-14 19:58:56 +02:00
parent bb10f8d802
commit e1b820fa33
1 changed files with 8 additions and 7 deletions
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15
libavfilter/vf_overlay.c
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@ -574,15 +574,16 @@ static inline void alpha_composite_##depth##_##nbits##bits(const AVFrame *src, c
const uint##depth##_t max = (1 << nbits) - 1; \
int bytes = depth / 8; \
\
imax = FFMIN(-y + dst_h, src_h); \
slice_start = (imax * jobnr) / nb_jobs; \
slice_end = ((imax * (jobnr+1)) / nb_jobs); \
\
imax = FFMIN3(-y + dst_h, FFMIN(src_h, dst_h), y + src_h); \
i = FFMAX(-y, 0); \
sa = (uint##depth##_t *)(src->data[3] + (i + slice_start) * src->linesize[3]); \
da = (uint##depth##_t *)(dst->data[3] + (y + i + slice_start) * dst->linesize[3]); \
\
for (i = i + slice_start; i < slice_end; i++) { \
slice_start = i + (imax * jobnr) / nb_jobs; \
slice_end = i + ((imax * (jobnr+1)) / nb_jobs); \
\
sa = (uint##depth##_t *)(src->data[3] + (slice_start) * src->linesize[3]); \
da = (uint##depth##_t *)(dst->data[3] + (y + slice_start) * dst->linesize[3]); \
\
for (i = slice_start; i < slice_end; i++) { \
j = FFMAX(-x, 0); \
s = sa + j; \
d = da + x+j; \