ST_Intersects()

Datum ST_Intersects

(

PG_FUNCTION_ARGS

)

Definition at line 91 of file lwgeom_geos_predicates.c.

{
        SHARED_GSERIALIZED *shared_geom1 = ToastCacheGetGeometry(fcinfo, 0);
        SHARED_GSERIALIZED *shared_geom2 = ToastCacheGetGeometry(fcinfo, 1);
        const GSERIALIZED *geom1 = shared_gserialized_get(shared_geom1);
        const GSERIALIZED *geom2 = shared_gserialized_get(shared_geom2);
        int result;
        GBOX box1, box2;
        PrepGeomCache *prep_cache;
 
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        /* A.Intersects(Empty) == FALSE */
        if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
                PG_RETURN_BOOL(false);
 
        /*
         * Short-circuit 1: if geom2 bounding box does not overlap
         * geom1 bounding box we can return FALSE.
         */
        if ( gserialized_get_gbox_p(geom1, &box1) &&
             gserialized_get_gbox_p(geom2, &box2) )
        {
                if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
                        PG_RETURN_BOOL(false);
        }
 
        /*
         * Short-circuit 2: if the geoms are a point and a polygon,
         * call the itree_pip_intersects function.
         */
        if ((is_point(geom1) && is_poly(geom2)) ||
            (is_point(geom2) && is_poly(geom1)))
        {
                SHARED_GSERIALIZED *shared_gpoly = is_poly(geom1) ? shared_geom1 : shared_geom2;
                SHARED_GSERIALIZED *shared_gpoint = is_point(geom1) ? shared_geom1 : shared_geom2;
                const GSERIALIZED *gpoint = shared_gserialized_get(shared_gpoint);
                LWGEOM *lwpt = lwgeom_from_gserialized(gpoint);
                IntervalTree *itree = GetIntervalTree(fcinfo, shared_gpoly);
                bool result = itree_pip_intersects(itree, lwpt);
                lwgeom_free(lwpt);
                PG_RETURN_BOOL(result);
        }
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        prep_cache = GetPrepGeomCache(fcinfo, shared_geom1, shared_geom2);
        if ( prep_cache && prep_cache->prepared_geom )
        {
                GEOSGeometry *g = prep_cache->gcache.argnum == 1
                        ? POSTGIS2GEOS(geom2)
                        : POSTGIS2GEOS(geom1);
                if (!g) HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
                result = GEOSPreparedIntersects(prep_cache->prepared_geom, g);
                GEOSGeom_destroy(g);
        }
        else
        {
                GEOSGeometry *g1, *g2;
                g1 = POSTGIS2GEOS(geom1);
                if (!g1) HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
                g2 = POSTGIS2GEOS(geom2);
                if (!g2)
                {
                        GEOSGeom_destroy(g1);
                        HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
                }
                result = GEOSIntersects(g1, g2);
                GEOSGeom_destroy(g1);
                GEOSGeom_destroy(g2);
        }
 
        if (result == 2) HANDLE_GEOS_ERROR("GEOSIntersects");
 
        PG_RETURN_BOOL(result);
}

References gbox_overlaps_2d(), PrepGeomCache::gcache, GetIntervalTree(), GetPrepGeomCache(), gserialized_error_if_srid_mismatch(), gserialized_get_gbox_p(), gserialized_is_empty(), HANDLE_GEOS_ERROR, is_point(), is_poly(), itree_pip_intersects(), LW_FALSE, lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_error(), POSTGIS2GEOS(), PrepGeomCache::prepared_geom, and result.

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