PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ covers()

Datum covers ( PG_FUNCTION_ARGS  )

Definition at line 1992 of file postgis/lwgeom_geos.c.

References coveredby(), error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_contains_2d(), PrepGeomCache::gcache, LWMPOINT::geoms, GetPrepGeomCache(), 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, POSTGIS2GEOS(), and PrepGeomCache::prepared_geom.

Referenced by containsproperly(), lwt_AddPolygon(), and rt_raster_compute_skewed_raster().

1993 {
1994  GSERIALIZED *geom1;
1995  GSERIALIZED *geom2;
1996  int result;
1997  GBOX box1, box2;
1998  PrepGeomCache *prep_cache;
1999 
2000  geom1 = PG_GETARG_GSERIALIZED_P(0);
2001  geom2 = PG_GETARG_GSERIALIZED_P(1);
2002 
2003  /* A.Covers(Empty) == FALSE */
2004  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2005  PG_RETURN_BOOL(false);
2006 
2007  errorIfGeometryCollection(geom1,geom2);
2009 
2010  /*
2011  * short-circuit 1: if geom2 bounding box is not completely inside
2012  * geom1 bounding box we can prematurely return FALSE.
2013  */
2014  if ( gserialized_get_gbox_p(geom1, &box1) &&
2015  gserialized_get_gbox_p(geom2, &box2) )
2016  {
2017  if ( ! gbox_contains_2d(&box1, &box2) )
2018  {
2019  PG_RETURN_BOOL(false);
2020  }
2021  }
2022  /*
2023  * short-circuit 2: if geom2 is a point and geom1 is a polygon
2024  * call the point-in-polygon function.
2025  */
2026  if (is_poly(geom1) && is_point(geom2))
2027  {
2028  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2029  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2030  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2031  int retval;
2032 
2033  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2034  if (gserialized_get_type(gpoint) == POINTTYPE)
2035  {
2036  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2037  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2038  lwgeom_free(point);
2039 
2040  retval = (pip_result != -1); /* not outside */
2041  }
2042  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2043  {
2045  uint32_t i;
2046 
2047  retval = LW_TRUE;
2048  for (i = 0; i < mpoint->ngeoms; i++)
2049  {
2050  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2051  if (pip_result == -1)
2052  {
2053  retval = LW_FALSE;
2054  break;
2055  }
2056  }
2057 
2058  lwmpoint_free(mpoint);
2059  }
2060  else
2061  {
2062  /* Never get here */
2063  elog(ERROR,"Type isn't point or multipoint!");
2064  PG_RETURN_NULL();
2065  }
2066 
2067  PG_FREE_IF_COPY(geom1, 0);
2068  PG_FREE_IF_COPY(geom2, 1);
2069  PG_RETURN_BOOL(retval);
2070  }
2071  else
2072  {
2073  POSTGIS_DEBUGF(3, "Covers: type1: %d, type2: %d", gserialized_get_type(geom1), gserialized_get_type(geom2));
2074  }
2075 
2076  initGEOS(lwpgnotice, lwgeom_geos_error);
2077 
2078  prep_cache = GetPrepGeomCache( fcinfo, geom1, 0 );
2079 
2080  if ( prep_cache && prep_cache->prepared_geom && prep_cache->gcache.argnum == 1 )
2081  {
2082  GEOSGeometry *g1 = POSTGIS2GEOS(geom2);
2083  if (!g1)
2085  "First argument geometry could not be converted to "
2086  "GEOS");
2087  result = GEOSPreparedCovers( prep_cache->prepared_geom, g1);
2088  GEOSGeom_destroy(g1);
2089  }
2090  else
2091  {
2092  GEOSGeometry *g1;
2093  GEOSGeometry *g2;
2094 
2095  g1 = POSTGIS2GEOS(geom1);
2096  if (!g1)
2098  "First argument geometry could not be converted to "
2099  "GEOS");
2100  g2 = POSTGIS2GEOS(geom2);
2101  if (!g2)
2102  {
2103  GEOSGeom_destroy(g1);
2105  "Second argument geometry could not be converted "
2106  "to GEOS");
2107  }
2108  result = GEOSRelatePattern( g1, g2, "******FF*" );
2109  GEOSGeom_destroy(g1);
2110  GEOSGeom_destroy(g2);
2111  }
2112 
2113  if (result == 2) HANDLE_GEOS_ERROR("GEOSCovers");
2114 
2115  PG_FREE_IF_COPY(geom1, 0);
2116  PG_FREE_IF_COPY(geom2, 1);
2117 
2118  PG_RETURN_BOOL(result);
2119 
2120 }
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
const GEOSPreparedGeometry * prepared_geom
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
PrepGeomCache * GetPrepGeomCache(FunctionCallInfoData *fcinfo, GSERIALIZED *g1, GSERIALIZED *g2)
Given a couple potential geometries and a function call context, return a prepared structure for one ...
#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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