man xor_mode () - Shortcut for toggling xor drawing mode on and off. Allegro game programming library.
NAME
xor_mode - Shortcut for toggling xor drawing mode on and off. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void xor_mode(int on);
DESCRIPTION
This is a shortcut for toggling xor drawing mode on and off. Calling xor_mode(TRUE) is equivalent to drawing_mode(DRAW_MODE_XOR, NULL, 0, 0). Calling xor_mode(FALSE) is equivalent to drawing_mode(DRAW_MODE_SOLID, NULL, 0, 0).