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is_windowed_mode(3)             Allegro manual             is_windowed_mode(3)

NAME
       is_windowed_mode - Tells if you are running in windowed mode. Allegro
       game programming library.

SYNOPSIS
       #include <allegro.h>

       int is_windowed_mode(void);

DESCRIPTION
       This function can be used to detect whether or not set_gfx_mode()
       selected a windowed mode. Example:

          if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0)
             abort_on_error("Couldn't set graphic mode!");
          if (is_windowed_mode()) {
             /* Windowed mode stuff. */
          } else {
             /* Fullscreen mode stuff. */
          }

RETURN VALUE
       Returns true if the current graphics mode is a windowed mode, or zero
       if it is a fullscreen mode. You should not call this function if you
       are not in graphics mode.

SEE ALSO
       set_gfx_mode(3)

Allegro                          version 4.4.2             is_windowed_mode(3)