PostGIS  2.3.7dev-r@@SVN_REVISION@@
Datum geos_intersects ( PG_FUNCTION_ARGS  )

Definition at line 2292 of file postgis/lwgeom_geos.c.

References PrepGeomCache::argnum, error_if_srid_mismatch(), errorIfGeometryCollection(), FALSE, gbox_overlaps_2d(), 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, pip_short_circuit(), POINTTYPE, POSTGIS2GEOS(), and PrepGeomCache::prepared_geom.

2293 {
2294  GSERIALIZED *geom1;
2295  GSERIALIZED *geom2;
2296  int result;
2297  GBOX box1, box2;
2298  PrepGeomCache *prep_cache;
2299 
2300  geom1 = PG_GETARG_GSERIALIZED_P(0);
2301  geom2 = PG_GETARG_GSERIALIZED_P(1);
2302 
2303  errorIfGeometryCollection(geom1,geom2);
2305 
2306  /* A.Intersects(Empty) == FALSE */
2307  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2308  PG_RETURN_BOOL(false);
2309 
2310  /*
2311  * short-circuit 1: if geom2 bounding box does not overlap
2312  * geom1 bounding box we can prematurely return FALSE.
2313  */
2314  if ( gserialized_get_gbox_p(geom1, &box1) &&
2315  gserialized_get_gbox_p(geom2, &box2) )
2316  {
2317  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2318  {
2319  PG_RETURN_BOOL(FALSE);
2320  }
2321  }
2322 
2323  /*
2324  * short-circuit 2: if the geoms are a point and a polygon,
2325  * call the point_outside_polygon function.
2326  */
2327  if ((is_point(geom1) && is_poly(geom2)) || (is_poly(geom1) && is_point(geom2)))
2328  {
2329  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2330  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2331  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2332  int retval;
2333 
2334  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2335  if (gserialized_get_type(gpoint) == POINTTYPE)
2336  {
2337  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2338  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2339  lwgeom_free(point);
2340 
2341  retval = (pip_result != -1); /* not outside */
2342  }
2343  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2344  {
2346  uint32_t i;
2347 
2348  retval = LW_FALSE;
2349  for (i = 0; i < mpoint->ngeoms; i++)
2350  {
2351  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2352  if (pip_result != -1) /* not outside */
2353  {
2354  retval = LW_TRUE;
2355  break;
2356  }
2357  }
2358 
2359  lwmpoint_free(mpoint);
2360  }
2361  else
2362  {
2363  /* Never get here */
2364  elog(ERROR,"Type isn't point or multipoint!");
2365  PG_RETURN_NULL();
2366  }
2367 
2368  PG_FREE_IF_COPY(geom1, 0);
2369  PG_FREE_IF_COPY(geom2, 1);
2370  PG_RETURN_BOOL(retval);
2371  }
2372 
2373  initGEOS(lwpgnotice, lwgeom_geos_error);
2374  prep_cache = GetPrepGeomCache( fcinfo, geom1, geom2 );
2375 
2376  if ( prep_cache && prep_cache->prepared_geom )
2377  {
2378  if ( prep_cache->argnum == 1 )
2379  {
2380  GEOSGeometry *g = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2381  if ( 0 == g ) /* exception thrown at construction */
2382  {
2383  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2384  PG_RETURN_NULL();
2385  }
2386  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2387  GEOSGeom_destroy(g);
2388  }
2389  else
2390  {
2391  GEOSGeometry *g = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2392  if ( 0 == g ) /* exception thrown at construction */
2393  {
2394  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2395  PG_RETURN_NULL();
2396  }
2397  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2398  GEOSGeom_destroy(g);
2399  }
2400  }
2401  else
2402  {
2403  GEOSGeometry *g1;
2404  GEOSGeometry *g2;
2405  g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1);
2406  if ( 0 == g1 ) /* exception thrown at construction */
2407  {
2408  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2409  PG_RETURN_NULL();
2410  }
2411  g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2);
2412  if ( 0 == g2 ) /* exception thrown at construction */
2413  {
2414  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2415  GEOSGeom_destroy(g1);
2416  PG_RETURN_NULL();
2417  }
2418  result = GEOSIntersects( g1, g2);
2419  GEOSGeom_destroy(g1);
2420  GEOSGeom_destroy(g2);
2421  }
2422 
2423  if (result == 2)
2424  {
2425  HANDLE_GEOS_ERROR("GEOSIntersects");
2426  PG_RETURN_NULL(); /* never get here */
2427  }
2428 
2429  PG_FREE_IF_COPY(geom1, 0);
2430  PG_FREE_IF_COPY(geom2, 1);
2431 
2432  PG_RETURN_BOOL(result);
2433 }
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:398
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:69
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:1063
#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:57
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:369
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:93
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:153
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:469
int gbox_overlaps_2d(const GBOX *g1, const GBOX *g2)
Return LW_TRUE if the GBOX overlaps on the 2d plane, LW_FALSE otherwise.
Definition: g_box.c:335
#define FALSE
Definition: dbfopen.c:168
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:165
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
int ngeoms
Definition: liblwgeom.h:467
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:83
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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