BLEND_SCREEN      129 libavfilter/vf_blend.c     { "screen",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN},     0, 0, FLAGS, "mode" },\
BLEND_SCREEN      338 libavfilter/vf_blend.c         case BLEND_SCREEN:     param->blend = blend_screen;     break;