PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ covers()

Datum covers ( PG_FUNCTION_ARGS  )

Definition at line 1832 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().

1833 {
1834  GSERIALIZED *geom1;
1835  GSERIALIZED *geom2;
1836  int result;
1837  GBOX box1, box2;
1838  PrepGeomCache *prep_cache;
1839 
1840  geom1 = PG_GETARG_GSERIALIZED_P(0);
1841  geom2 = PG_GETARG_GSERIALIZED_P(1);
1842 
1843  /* A.Covers(Empty) == FALSE */
1844  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
1845  PG_RETURN_BOOL(false);
1846 
1847  errorIfGeometryCollection(geom1,geom2);
1849 
1850  /*
1851  * short-circuit 1: if geom2 bounding box is not completely inside
1852  * geom1 bounding box we can return FALSE.
1853  */
1854  if ( gserialized_get_gbox_p(geom1, &box1) &&
1855  gserialized_get_gbox_p(geom2, &box2) )
1856  {
1857  if ( ! gbox_contains_2d(&box1, &box2) )
1858  {
1859  PG_RETURN_BOOL(false);
1860  }
1861  }
1862  /*
1863  * short-circuit 2: if geom2 is a point and geom1 is a polygon
1864  * call the point-in-polygon function.
1865  */
1866  if (is_poly(geom1) && is_point(geom2))
1867  {
1868  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
1869  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
1870  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
1871  int retval;
1872 
1873  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
1874  if (gserialized_get_type(gpoint) == POINTTYPE)
1875  {
1876  LWGEOM* point = lwgeom_from_gserialized(gpoint);
1877  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
1878  lwgeom_free(point);
1879 
1880  retval = (pip_result != -1); /* not outside */
1881  }
1882  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
1883  {
1885  uint32_t i;
1886 
1887  retval = LW_TRUE;
1888  for (i = 0; i < mpoint->ngeoms; i++)
1889  {
1890  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
1891  if (pip_result == -1)
1892  {
1893  retval = LW_FALSE;
1894  break;
1895  }
1896  }
1897 
1898  lwmpoint_free(mpoint);
1899  }
1900  else
1901  {
1902  /* Never get here */
1903  elog(ERROR,"Type isn't point or multipoint!");
1904  PG_RETURN_NULL();
1905  }
1906 
1907  PG_FREE_IF_COPY(geom1, 0);
1908  PG_FREE_IF_COPY(geom2, 1);
1909  PG_RETURN_BOOL(retval);
1910  }
1911  else
1912  {
1913  POSTGIS_DEBUGF(3, "Covers: type1: %d, type2: %d", gserialized_get_type(geom1), gserialized_get_type(geom2));
1914  }
1915 
1916  initGEOS(lwpgnotice, lwgeom_geos_error);
1917 
1918  prep_cache = GetPrepGeomCache( fcinfo, geom1, 0 );
1919 
1920  if ( prep_cache && prep_cache->prepared_geom && prep_cache->gcache.argnum == 1 )
1921  {
1922  GEOSGeometry *g1 = POSTGIS2GEOS(geom2);
1923  if (!g1) HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
1924  result = GEOSPreparedCovers( prep_cache->prepared_geom, g1);
1925  GEOSGeom_destroy(g1);
1926  }
1927  else
1928  {
1929  GEOSGeometry *g1;
1930  GEOSGeometry *g2;
1931 
1932  g1 = POSTGIS2GEOS(geom1);
1933  if (!g1) HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
1934  g2 = POSTGIS2GEOS(geom2);
1935  if (!g2)
1936  {
1937  GEOSGeom_destroy(g1);
1938  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
1939  }
1940  result = GEOSRelatePattern( g1, g2, "******FF*" );
1941  GEOSGeom_destroy(g1);
1942  GEOSGeom_destroy(g2);
1943  }
1944 
1945  if (result == 2) HANDLE_GEOS_ERROR("GEOSCovers");
1946 
1947  PG_FREE_IF_COPY(geom1, 0);
1948  PG_FREE_IF_COPY(geom2, 1);
1949 
1950  PG_RETURN_BOOL(result);
1951 
1952 }
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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