set_mouse_sprite_focus - Man Page

#include <allegro.h>

void set_mouse_sprite_focus(int x, int y);

The mouse focus is the bit of the pointer that represents the actual  mouse position, ie. the (mouse_x, mouse_y) position. By default this is  the top left corner of the arrow, but if you are using a different mouse  pointer you might need to alter it.

set_mouse_sprite(3), exmouse(3)

exmouse(3), mouse_sprite(3), set_mouse_sprite(3).