mouse_on_screen - Tells you whether the mouse pointer is currently on screen. Allegro game programming

       This function can be useful to prevent having two mouse pointers on the screen  at  the  same  time  when
       running your program in windowed mode and drawing the mouse pointer yourself. Other possible uses include
       the ability to pause your game when the mouse goes off of the window, or only scrolling the view when the
       pointer is near the edge of the window, but not while off of the window.

       Example :

          if (mouse_on_screen()) {draw_sprite(buffer , mouse_sprite , mouse_x , mouse_y);}

       mouse_on_screen  -  Tells  you whether the mouse pointer is currently on screen. Allegro game programming
       library.

       Returns 0 if the mouse pointer is off of the screen, or non-zero otherwise.

Allegro                                           version 4.4.3                         mouse_on_screen(3alleg4)

#include<allegro.h>intmouse_on_screen();