UNPREMULTIPLY_ALPHA  410 libavfilter/vf_overlay.c                     alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
UNPREMULTIPLY_ALPHA  465 libavfilter/vf_overlay.c                         alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
UNPREMULTIPLY_ALPHA  537 libavfilter/vf_overlay.c                         alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);