hash table: key=(mbtk_pixmap_t *) value=(mbtk_px_id_t) 


extern mbtk_px_id_t mbtk_invalid_px_id;

#define HT_HAS_CONST_KEY
typedef mbtk_pixmap_t *htpxid_key_t;
typedef const mbtk_pixmap_t *htpxid_const_key_t;
typedef mbtk_px_id_t htpxid_value_t;
#define HT(x) htpxid_ ## x
#undef HT

unsigned htpxid_hash(const mbtk_pixmap_t *k);
int htpxid_keyeq(const mbtk_pixmap_t *a, const mbtk_pixmap_t *b);