P4_FBTYPE
p4type = P4_FBTYPE(p4);
#define P4_ID(x) (P4_FBTYPE((x)) == P4_ID_COLOR24 ? \
P4_FBTYPE((x)) & P4_ID_MASK)
#define P4_SIZE(x) (P4_FBTYPE((x)) & P4_SIZE_MASK)