dcss_dpr_argb_comp_sel
dcss_dpr_argb_comp_sel(ch, a_sel, r_sel, g_sel, b_sel);
dcss_dpr_argb_comp_sel(ch, 3, 2, 1, 0);
dcss_dpr_argb_comp_sel(ch, 0, 0, 0, 0);