PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ TWKBFromLWGEOM()

Datum TWKBFromLWGEOM ( PG_FUNCTION_ARGS  )

Definition at line 466 of file lwgeom_inout.c.

References gserialized_get_srid(), lwgeom_from_gserialized(), lwgeom_to_twkb(), PG_FUNCTION_INFO_V1(), TWKB_BBOX, TWKB_DEFAULT_PRECISION, TWKB_ID, TWKB_SIZE, TWKBFromLWGEOMArray(), and variant.

Referenced by WKBFromLWGEOM().

467 {
468  GSERIALIZED *geom;
469  LWGEOM *lwgeom;
470  uint8_t *twkb;
471  size_t twkb_size;
472  uint8_t variant = 0;
473  bytea *result;
474  srs_precision sp;
475 
476  /*check for null input since we cannot have the sql-function as strict.
477  That is because we use null as default for optional ID*/
478  if ( PG_ARGISNULL(0) ) PG_RETURN_NULL();
479 
480  geom = PG_GETARG_GSERIALIZED_P(0);
481 
482  /* Read sensible precision defaults (about one meter) given the srs */
483  sp = srid_axis_precision(fcinfo, gserialized_get_srid(geom), TWKB_DEFAULT_PRECISION);
484 
485  /* If user specified XY precision, use it */
486  if ( PG_NARGS() > 1 && ! PG_ARGISNULL(1) )
487  sp.precision_xy = PG_GETARG_INT32(1);
488 
489  /* If user specified Z precision, use it */
490  if ( PG_NARGS() > 2 && ! PG_ARGISNULL(2) )
491  sp.precision_z = PG_GETARG_INT32(2);
492 
493  /* If user specified M precision, use it */
494  if ( PG_NARGS() > 3 && ! PG_ARGISNULL(3) )
495  sp.precision_m = PG_GETARG_INT32(3);
496 
497  /* We don't permit ids for single geoemtries */
498  variant = variant & ~TWKB_ID;
499 
500  /* If user wants registered twkb sizes */
501  if ( PG_NARGS() > 4 && ! PG_ARGISNULL(4) && PG_GETARG_BOOL(4) )
502  variant |= TWKB_SIZE;
503 
504  /* If user wants bounding boxes */
505  if ( PG_NARGS() > 5 && ! PG_ARGISNULL(5) && PG_GETARG_BOOL(5) )
506  variant |= TWKB_BBOX;
507 
508  /* Create TWKB binary string */
509  lwgeom = lwgeom_from_gserialized(geom);
510  twkb = lwgeom_to_twkb(lwgeom, variant, sp.precision_xy, sp.precision_z, sp.precision_m, &twkb_size);
511 
512  /* Prepare the PgSQL text return type */
513  result = palloc(twkb_size + VARHDRSZ);
514  memcpy(VARDATA(result), twkb, twkb_size);
515  SET_VARSIZE(result, twkb_size + VARHDRSZ);
516 
517  PG_RETURN_BYTEA_P(result);
518 }
uint8_t variant
Definition: cu_in_twkb.c:26
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
#define TWKB_ID
Definition: liblwgeom.h:2084
#define TWKB_DEFAULT_PRECISION
Definition: liblwgeom.h:2087
#define TWKB_BBOX
Definition: liblwgeom.h:2082
#define TWKB_SIZE
Definition: liblwgeom.h:2083
uint8_t * lwgeom_to_twkb(const LWGEOM *geom, uint8_t variant, int8_t precision_xy, int8_t precision_z, int8_t precision_m, size_t *twkb_size)
Definition: lwout_twkb.c:614
unsigned char uint8_t
Definition: uthash.h:79
int32_t gserialized_get_srid(const GSERIALIZED *s)
Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function)...
Definition: g_serialized.c:99
Here is the call graph for this function:
Here is the caller graph for this function: