int
draw_character(
	char c,
	int x,
	int y,
	int size
)
{
#ifdef CONFIG_FONT_HERSHEY
	const hershey_char_t * const f = &hershey_simplex[c - ' '];
	int next_moveto = 1;

	for(int i = 0 ; i < f->count ; i++)
	{
		int dx = f->points[2*i+0];
		int dy = f->points[2*i+1];
		if (dx == -1)
		{
			next_moveto = 1;
			continue;
		}

		dx = (dx * size) * 3 / 4;
		dy = (dy * size) * 3 / 4;

		if (next_moveto)
			moveto(x + dx, y + dy);
		else
			lineto(x + dx, y + dy);

		next_moveto = 0;
	}

	return (f->width * size) * 3 / 4;
#else
	// Asteroids font only has upper case
	if ('a' <= c && c <= 'z')
		c -= 'a' - 'A';

	const uint8_t * const pts = asteroids_font[c - ' '].points;
	int next_moveto = 1;

	for(int i = 0 ; i < 8 ; i++)
	{
		uint8_t delta = pts[i];
		if (delta == FONT_LAST)
			break;
		if (delta == FONT_UP)
		{
			next_moveto = 1;
			continue;
		}

		unsigned dx = ((delta >> 4) & 0xF) * size;
		unsigned dy = ((delta >> 0) & 0xF) * size;

		if (next_moveto)
			moveto(x + dx, y + dy);
		else
			lineto(x + dx, y + dy);

		next_moveto = 0;
	}

	return 12 * size;
#endif
}


void
draw_string(
	const char * s,
	int x,
	int y,
	int size
)
{
	while(*s)
	{
		char c = *s++;
		x += draw_character(c, x, y, size);
	}
}