SCREEN_W man page

#include <allegro.h>

#define SCREEN_W;

#define SCREEN_H;

Global defines that return the width and height of the screen, or zero if the screen has not been initialised yet. Example:

   char buf[100];
   ...
   uszprintf(buf, sizeof(buf),
             "The screen size is %d x %d pixels",
             SCREEN_W, SCREEN_H);

screen(3), set_gfx_mode(3), VIRTUAL_W(3), VIRTUAL_H(3)

ex3buf(3), ex3d(3), exaccel(3), exalpha(3), exbitmap(3), exblend(3), excamera(3), excolmap(3), exconfig(3), exdbuf(3), exflame(3), exflip(3), exfont(3), exhello(3), exjoy(3), exkeys(3), exlights(3), exmem(3), exmidi(3), exmouse(3), expackf(3), expal(3), exrotscl(3), exsample(3), exscale(3), exscn3d(3), exscroll(3), exshade(3), exspline(3), exsprite(3), exstars(3), exstream(3), exswitch(3), exsyscur(3), extimer(3), extrans(3), extruec(3), exunicod(3), exupdate(3), exxfade(3), exzbuf(3), set_gfx_mode(3), VIRTUAL_W(3).

SCREEN_H(3) is an alias of SCREEN_W(3).