if( !pt->e ) continue;
if( set_target(engine->color, pt->x, pt->y) ) continue;
engine->threshold = pt->t;
if( !pt->e ) continue;
if( set_target(engine->color, pt->x, pt->y) ) continue;
engine->threshold = pt->t;
engine->process_packages();
fill_edge(edg, w, h);
FillRegion fill_region(edg, msk);
engine->process_packages();
fill_edge(edg, w, h);
FillRegion fill_region(edg, msk);