man fastline () - Faster version of line(). Allegro game programming library.
NAME
fastline - Faster version of line(). Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void fastline(BITMAP *bmp, int x1, int y1, int x2, int y2, int color);
DESCRIPTION
Faster version of the previous function. Note that pixel correctness is not guaranteed for this function.