al_get_display_flags - Allegro 5 API
Gets the flags of the display.
int al_get_display_flags(ALLEGRO_DISPLAY *display)
In addition to the flags set for the display at creation time with
al_set_new_display_flags(3) it can also have the ALLEGRO_MINIMIZED flag set,
indicating that the window is currently minimized. This flag is very
platform-dependent as even a minimized application may still render a
preview version so normally you should not care whether it is minimized or