LWGEOM_patchn()

Datum LWGEOM_patchn

(

PG_FUNCTION_ARGS

)

Definition at line 401 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        LWGEOM *lwgeom = lwgeom_from_gserialized(geom);
        GSERIALIZED *result = NULL;
        int32 idx = PG_GETARG_INT32(1);
        LWGEOM *subgeom = NULL;
 
        if (!lwgeom_has_patches(lwgeom))
        {
                lwgeom_free(lwgeom);
                PG_FREE_IF_COPY(geom, 0);
                elog(ERROR, "ST_PatchN only supports TIN and PolyhedralSurface geometries");
        }
 
        /* Access patches individually */
        subgeom = lwgeom_extract_geometry_n(lwgeom, idx, true);
 
        if (!subgeom)
                PG_RETURN_NULL();
 
        /* If returning the original geometry */
        if (subgeom == lwgeom)
                PG_RETURN_POINTER(geom);
 
        subgeom->srid = lwgeom->srid;
        /* COMPUTE_BBOX==TAINTING */
        if (lwgeom->bbox) lwgeom_add_bbox(subgeom);
 
        result = geometry_serialize(subgeom);
        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_POINTER(result);
}

References LWGEOM::bbox, lwgeom_add_bbox(), lwgeom_extract_geometry_n(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_has_patches(), result, and LWGEOM::srid.

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