* (5) If you compute both upconf and leftconf, and there is
* sufficient signal, the following table determines the
* cw angle necessary to rotate pixs so that the text is
* rightside-up:
* 0 deg : upconf >> 1, abs(upconf) >> abs(leftconf)
* 90 deg : leftconf >> 1, abs(leftconf) >> abs(upconf)
* 180 deg : upconf << -1, abs(upconf) >> abs(leftconf)
* 270 deg : leftconf << -1, abs(leftconf) >> abs(upconf)