fb_drawline
fb_drawline(fb, x, y - size + 1, x, y - 1, pixel);
fb_drawline(fb, x + 1, y - size + 1, x + 1, y - 1, pixel);
fb_drawline(fb, x, y + 2, x, y + size, pixel);
fb_drawline(fb, x + 1, y + 2, x + 1, y + size, pixel);
fb_drawline(fb, x - size + 1, y, x - 1, y, pixel);
fb_drawline(fb, x - size + 1, y + 1, x - 1, y + 1, pixel);
fb_drawline(fb, x + 2, y, x + size, y, pixel);
fb_drawline(fb, x + 2, y + 1, x + size, y + 1, pixel);
void fb_drawline(struct fb *, int, int, int, int, fb_pixel_t);