var ww = window_get_width();
var wh = window_get_height();
var sw = surface_get_width(application_surface);
var sh = surface_get_height(application_surface);
var scale_w = ww / sw;
var scale_h = wh / sh;
if (global.osflavor >= 4)
    global.window_scale = floor(min(scale_w, scale_h));
else
    global.window_scale = min(scale_w, scale_h);