PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ coveredby()

Datum coveredby ( PG_FUNCTION_ARGS  )

Definition at line 1967 of file postgis/lwgeom_geos.c.

References crosses(), error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_contains_2d(), LWMPOINT::geoms, GetRtreeCache(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_get_type(), gserialized_is_empty(), HANDLE_GEOS_ERROR, is_point(), is_poly(), LW_FALSE, LW_TRUE, lwgeom_as_lwmpoint(), lwgeom_as_lwpoint(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_error(), lwmpoint_free(), MULTIPOINTTYPE, LWMPOINT::ngeoms, PG_FUNCTION_INFO_V1(), pip_short_circuit(), POINTTYPE, and POSTGIS2GEOS().

Referenced by covers().

1968 {
1969  GSERIALIZED *geom1;
1970  GSERIALIZED *geom2;
1971  GEOSGeometry *g1, *g2;
1972  int result;
1973  GBOX box1, box2;
1974  char *patt = "**F**F***";
1975 
1976  geom1 = PG_GETARG_GSERIALIZED_P(0);
1977  geom2 = PG_GETARG_GSERIALIZED_P(1);
1978 
1979  errorIfGeometryCollection(geom1,geom2);
1981 
1982  /* A.CoveredBy(Empty) == FALSE */
1983  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
1984  PG_RETURN_BOOL(false);
1985 
1986  /*
1987  * short-circuit 1: if geom1 bounding box is not completely inside
1988  * geom2 bounding box we can return FALSE.
1989  */
1990  if ( gserialized_get_gbox_p(geom1, &box1) &&
1991  gserialized_get_gbox_p(geom2, &box2) )
1992  {
1993  if ( ! gbox_contains_2d(&box2, &box1) )
1994  {
1995  PG_RETURN_BOOL(false);
1996  }
1997 
1998  POSTGIS_DEBUG(3, "bounding box short-circuit missed.");
1999  }
2000  /*
2001  * short-circuit 2: if geom1 is a point and geom2 is a polygon
2002  * call the point-in-polygon function.
2003  */
2004  if (is_point(geom1) && is_poly(geom2))
2005  {
2006  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2007  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2008  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2009  int retval;
2010 
2011  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2012  if (gserialized_get_type(gpoint) == POINTTYPE)
2013  {
2014  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2015  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2016  lwgeom_free(point);
2017 
2018  retval = (pip_result != -1); /* not outside */
2019  }
2020  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2021  {
2023  uint32_t i;
2024 
2025  retval = LW_TRUE;
2026  for (i = 0; i < mpoint->ngeoms; i++)
2027  {
2028  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2029  if (pip_result == -1)
2030  {
2031  retval = LW_FALSE;
2032  break;
2033  }
2034  }
2035 
2036  lwmpoint_free(mpoint);
2037  }
2038  else
2039  {
2040  /* Never get here */
2041  elog(ERROR,"Type isn't point or multipoint!");
2042  PG_RETURN_NULL();
2043  }
2044 
2045  PG_FREE_IF_COPY(geom1, 0);
2046  PG_FREE_IF_COPY(geom2, 1);
2047  PG_RETURN_BOOL(retval);
2048  }
2049  else
2050  {
2051  POSTGIS_DEBUGF(3, "CoveredBy: type1: %d, type2: %d", gserialized_get_type(geom1), gserialized_get_type(geom2));
2052  }
2053 
2054  initGEOS(lwpgnotice, lwgeom_geos_error);
2055 
2056  g1 = POSTGIS2GEOS(geom1);
2057 
2058  if (!g1)
2059  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2060 
2061  g2 = POSTGIS2GEOS(geom2);
2062 
2063  if (!g2)
2064  {
2065  GEOSGeom_destroy(g1);
2066  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2067  }
2068 
2069  result = GEOSRelatePattern(g1,g2,patt);
2070 
2071  GEOSGeom_destroy(g1);
2072  GEOSGeom_destroy(g2);
2073 
2074  if (result == 2) HANDLE_GEOS_ERROR("GEOSCoveredBy");
2075 
2076  PG_FREE_IF_COPY(geom1, 0);
2077  PG_FREE_IF_COPY(geom2, 1);
2078 
2079  PG_RETURN_BOOL(result);
2080 }
int gserialized_get_gbox_p(const GSERIALIZED *g, GBOX *box)
Read the bounding box off a serialization and calculate one if it is not already there.
Definition: g_serialized.c:639
uint32_t gserialized_get_type(const GSERIALIZED *s)
Extract the geometry type from the serialized form (it hides in the anonymous data area...
Definition: g_serialized.c:86
uint32_t ngeoms
Definition: liblwgeom.h:470
static char is_poly(const GSERIALIZED *g)
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
#define MULTIPOINTTYPE
Definition: liblwgeom.h:87
The tree structure used for fast P-i-P tests by point_in_multipolygon_rtree()
Definition: lwgeom_rtree.h:58
int gbox_contains_2d(const GBOX *g1, const GBOX *g2)
Return LW_TRUE if the first GBOX contains the second on the 2d plane, LW_FALSE otherwise.
Definition: g_box.c:346
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:161
static char is_point(const GSERIALIZED *g)
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
unsigned int uint32_t
Definition: uthash.h:78
void lwmpoint_free(LWMPOINT *mpt)
Definition: lwmpoint.c:72
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:76
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
LWPOINT ** geoms
Definition: liblwgeom.h:472
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:84
LWMPOINT * lwgeom_as_lwmpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:233
#define HANDLE_GEOS_ERROR(label)
RTREE_POLY_CACHE * GetRtreeCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1)
Checks for a cache hit against the provided geometry and returns a pre-built index structure (RTREE_P...
Definition: lwgeom_rtree.c:432
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
static int pip_short_circuit(RTREE_POLY_CACHE *poly_cache, LWPOINT *point, GSERIALIZED *gpoly)
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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