Is it possible to read the current flags that the display has been given? So when one calls pygame.display.set_mode(resolution, FLAGS), I'd love to read them afterwards.
For example I'd like to have an is_fullscreen() function.
You're looking for the pygame.Surface.get_flags method.
Returns a set of current Surface features. Each feature is a bit in the flags bitmask.
pygame.display.set_mode returns a pygame.Surface. So call the get_flags method of your display and bitwise AND it with the specific flag.
def is_fullscreen(display):
return bool(display.get_flags() & pygame.FULLSCREEN)