This function changes the cursor image Allegro uses if select_mouse_cursor() is called but no native operating system cursor can be used, e.g. because you did not call enable_hardware_cursor().

The cursor argument can be one of:
MOUSE_CURSOR_ALLEGRO
MOUSE_CURSOR_ARROW
MOUSE_CURSOR_BUSY
MOUSE_CURSOR_QUESTION
MOUSE_CURSOR_EDIT


but not MOUSE_CURSOR_NONE.

The bmp argument can either point to a valid bitmap or it can be NULL. Passing a bitmap makes Allegro use that image in place of its own default substition (should the operating system's native cursor be unavailable). The bitmap must remain available for the duration in which it could be used. Passing NULL lets Allegro revert to its default substitutions.

The effect of this function will not be apparent until show_mouse() is called.

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