dc_fixpt_clamp
dc_fixpt_clamp(
output = dc_fixpt_clamp(output, dc_fixpt_zero, dc_fixpt_one);
output = dc_fixpt_clamp(output, dc_fixpt_zero,
tf_pts->red[i] = dc_fixpt_clamp(
tf_pts->green[i] = dc_fixpt_clamp(
tf_pts->blue[i] = dc_fixpt_clamp(