SCREEN            201 libavfilter/vf_blend.c DEFINE_BLEND(screen,     SCREEN(1, A, B))
SCREEN            202 libavfilter/vf_blend.c DEFINE_BLEND(overlay,    (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
SCREEN            203 libavfilter/vf_blend.c DEFINE_BLEND(hardlight,  (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))