clip_interval     455 libavfilter/drawutils.c     clip_interval(dst_w, &x0, &w, NULL);
clip_interval     456 libavfilter/drawutils.c     clip_interval(dst_h, &y0, &h, NULL);
clip_interval     632 libavfilter/drawutils.c     clip_interval(dst_w, &x0, &mask_w, &xm0);
clip_interval     633 libavfilter/drawutils.c     clip_interval(dst_h, &y0, &mask_h, &ym0);