touches()

Datum touches

(

PG_FUNCTION_ARGS

)

Definition at line 229 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);
        char result;
        GBOX box1, box2;
        PrepGeomCache *prep_cache;
 
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        /* A.Touches(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);
                }
        }
 
        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 = GEOSPreparedTouches(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 = GEOSTouches(g1, g2);
                GEOSGeom_destroy(g1);
                GEOSGeom_destroy(g2);
        }
 
        if (result == 2) HANDLE_GEOS_ERROR("GEOSTouches");
 
        PG_RETURN_BOOL(result);
}

References gbox_overlaps_2d(), PrepGeomCache::gcache, GetPrepGeomCache(), gserialized_error_if_srid_mismatch(), gserialized_get_gbox_p(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), POSTGIS2GEOS(), PrepGeomCache::prepared_geom, and result.

Referenced by rt_raster_touches().

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