within()

Datum within

(

PG_FUNCTION_ARGS

)

Definition at line 577 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;
        GEOSGeometry *g1, *g2;
        GBOX box1, box2;
        PrepGeomCache *prep_cache;
 
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        /* A.Contains(Empty) == FALSE */
        if (gserialized_is_empty(geom1) || gserialized_is_empty(geom2))
                PG_RETURN_BOOL(false);
 
        POSTGIS_DEBUGF(3, "Contains: type1: %d, type2: %d", gserialized_get_type(geom1), gserialized_get_type(geom2));
 
        /*
        ** Short-circuit 1: if geom1 bounding box is not completely inside
        ** geom2 bounding box we can return FALSE.
        */
        if (gserialized_get_gbox_p(geom1, &box1) &&
            gserialized_get_gbox_p(geom2, &box2))
        {
                if (!gbox_within_2d(&box1, &box2))
                        PG_RETURN_BOOL(false);
        }
 
        /*
        ** Short-circuit 2: if geom2 is a polygon and geom1 is a point
        ** call the point-in-polygon function.
        */
        if (is_poly(geom2) && is_point(geom1))
        {
                const GSERIALIZED *gpoint = shared_gserialized_get(shared_geom1);
                LWGEOM *lwpt = lwgeom_from_gserialized(gpoint);
                IntervalTree *itree = GetIntervalTree(fcinfo, shared_geom2);
                bool result = itree_pip_contains(itree, lwpt);
                lwgeom_free(lwpt);
                PG_RETURN_BOOL(result);
        }
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        prep_cache = GetPrepGeomCache(fcinfo, NULL, shared_geom2);
        if ( prep_cache && prep_cache->prepared_geom && prep_cache->gcache.argnum == 2 )
        {
                g1 = POSTGIS2GEOS(geom1);
                if (!g1)
                        HANDLE_GEOS_ERROR("Geometry could not be converted to GEOS");
 
                result = GEOSPreparedContains(prep_cache->prepared_geom, g1);
                GEOSGeom_destroy(g1);
        }
        else
        {
                g1 = POSTGIS2GEOS(geom1);
                if (!g1) HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
                g2 = POSTGIS2GEOS(geom2);
                if (!g2)
                {
                        HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
                        GEOSGeom_destroy(g1);
                }
                result = GEOSWithin(g1, g2);
                GEOSGeom_destroy(g1);
                GEOSGeom_destroy(g2);
        }
 
        if ( result == 2 ) HANDLE_GEOS_ERROR("GEOSWithin");
 
        PG_RETURN_BOOL(result > 0);
}

References gbox_within_2d(), PrepGeomCache::gcache, GetIntervalTree(), GetPrepGeomCache(), gserialized_error_if_srid_mismatch(), gserialized_get_gbox_p(), gserialized_get_type(), gserialized_is_empty(), HANDLE_GEOS_ERROR, is_point(), is_poly(), itree_pip_contains(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_error(), POSTGIS2GEOS(), PrepGeomCache::prepared_geom, and result.

Referenced by lwgeom_cpa_within(), and rt_raster_intersects().

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