bw_def_underlay420_chroma
surface_type[1] = bw_def_underlay420_chroma;
surface_type[3] = bw_def_underlay420_chroma;
if (surface_type[i] == bw_def_display_write_back420_chroma || surface_type[i] == bw_def_underlay420_chroma) {
case bw_def_underlay420_chroma: