PostGIS  2.5.0dev-r@@SVN_REVISION@@
Datum geos_intersects ( PG_FUNCTION_ARGS  )

Definition at line 2270 of file postgis/lwgeom_geos.c.

References PrepGeomCache::argnum, error_if_srid_mismatch(), errorIfGeometryCollection(), 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.

2271 {
2272  GSERIALIZED *geom1;
2273  GSERIALIZED *geom2;
2274  int result;
2275  GBOX box1, box2;
2276  PrepGeomCache *prep_cache;
2277 
2278  geom1 = PG_GETARG_GSERIALIZED_P(0);
2279  geom2 = PG_GETARG_GSERIALIZED_P(1);
2280 
2281  errorIfGeometryCollection(geom1,geom2);
2283 
2284  /* A.Intersects(Empty) == FALSE */
2285  if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
2286  PG_RETURN_BOOL(false);
2287 
2288  /*
2289  * short-circuit 1: if geom2 bounding box does not overlap
2290  * geom1 bounding box we can prematurely return FALSE.
2291  */
2292  if ( gserialized_get_gbox_p(geom1, &box1) &&
2293  gserialized_get_gbox_p(geom2, &box2) )
2294  {
2295  if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
2296  {
2297  PG_RETURN_BOOL(false);
2298  }
2299  }
2300 
2301  /*
2302  * short-circuit 2: if the geoms are a point and a polygon,
2303  * call the point_outside_polygon function.
2304  */
2305  if ((is_point(geom1) && is_poly(geom2)) || (is_poly(geom1) && is_point(geom2)))
2306  {
2307  GSERIALIZED* gpoly = is_poly(geom1) ? geom1 : geom2;
2308  GSERIALIZED* gpoint = is_point(geom1) ? geom1 : geom2;
2309  RTREE_POLY_CACHE* cache = GetRtreeCache(fcinfo, gpoly);
2310  int retval;
2311 
2312  POSTGIS_DEBUG(3, "Point in Polygon test requested...short-circuiting.");
2313  if (gserialized_get_type(gpoint) == POINTTYPE)
2314  {
2315  LWGEOM* point = lwgeom_from_gserialized(gpoint);
2316  int pip_result = pip_short_circuit(cache, lwgeom_as_lwpoint(point), gpoly);
2317  lwgeom_free(point);
2318 
2319  retval = (pip_result != -1); /* not outside */
2320  }
2321  else if (gserialized_get_type(gpoint) == MULTIPOINTTYPE)
2322  {
2324  uint32_t i;
2325 
2326  retval = LW_FALSE;
2327  for (i = 0; i < mpoint->ngeoms; i++)
2328  {
2329  int pip_result = pip_short_circuit(cache, mpoint->geoms[i], gpoly);
2330  if (pip_result != -1) /* not outside */
2331  {
2332  retval = LW_TRUE;
2333  break;
2334  }
2335  }
2336 
2337  lwmpoint_free(mpoint);
2338  }
2339  else
2340  {
2341  /* Never get here */
2342  elog(ERROR,"Type isn't point or multipoint!");
2343  PG_RETURN_NULL();
2344  }
2345 
2346  PG_FREE_IF_COPY(geom1, 0);
2347  PG_FREE_IF_COPY(geom2, 1);
2348  PG_RETURN_BOOL(retval);
2349  }
2350 
2351  initGEOS(lwpgnotice, lwgeom_geos_error);
2352  prep_cache = GetPrepGeomCache( fcinfo, geom1, geom2 );
2353 
2354  if ( prep_cache && prep_cache->prepared_geom )
2355  {
2356  if ( prep_cache->argnum == 1 )
2357  {
2358  GEOSGeometry *g = POSTGIS2GEOS(geom2);
2359  if (!g)
2360  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2361  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2362  GEOSGeom_destroy(g);
2363  }
2364  else
2365  {
2366  GEOSGeometry *g = POSTGIS2GEOS(geom1);
2367  if (!g)
2368  HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
2369  result = GEOSPreparedIntersects( prep_cache->prepared_geom, g);
2370  GEOSGeom_destroy(g);
2371  }
2372  }
2373  else
2374  {
2375  GEOSGeometry *g1;
2376  GEOSGeometry *g2;
2377  g1 = POSTGIS2GEOS(geom1);
2378  if (!g1)
2380  "First argument geometry could not be converted to "
2381  "GEOS");
2382  g2 = POSTGIS2GEOS(geom2);
2383  if (!g2)
2384  {
2385  GEOSGeom_destroy(g1);
2387  "Second argument geometry could not be converted "
2388  "to GEOS");
2389  }
2390  result = GEOSIntersects( g1, g2);
2391  GEOSGeom_destroy(g1);
2392  GEOSGeom_destroy(g2);
2393  }
2394 
2395  if (result == 2) HANDLE_GEOS_ERROR("GEOSIntersects");
2396 
2397  PG_FREE_IF_COPY(geom1, 0);
2398  PG_FREE_IF_COPY(geom2, 1);
2399 
2400  PG_RETURN_BOOL(result);
2401 }
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:467
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:1137
#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:338
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:160
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: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:330
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:232
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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