ST_AsMVTGeom()

Datum ST_AsMVTGeom

(

PG_FUNCTION_ARGS

)

Definition at line 42 of file lwgeom_out_mvt.c.

{
#ifndef HAVE_LIBPROTOBUF
        elog(ERROR, "Missing libprotobuf-c");
        PG_RETURN_NULL();
#else
        LWGEOM *lwgeom_in, *lwgeom_out;
        GSERIALIZED *geom_in, *geom_out;
        GBOX *bounds;
        int extent, buffer;
        bool clip_geom;
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
        geom_in = PG_GETARG_GSERIALIZED_P_COPY(0);
        lwgeom_in = lwgeom_from_gserialized(geom_in);
        if (PG_ARGISNULL(1))
                elog(ERROR, "%s: parameter bounds cannot be null", __func__);
        bounds = (GBOX *) PG_GETARG_POINTER(1);
        extent = PG_ARGISNULL(2) ? 4096 : PG_GETARG_INT32(2);
        buffer = PG_ARGISNULL(3) ? 256 : PG_GETARG_INT32(3);
        clip_geom = PG_ARGISNULL(4) ? true : PG_GETARG_BOOL(4);
        // NOTE: can both return in clone and in place modification so
        // not known if lwgeom_in can be freed
        lwgeom_out = mvt_geom(lwgeom_in, bounds, extent, buffer, clip_geom);
        if (lwgeom_out == NULL)
                PG_RETURN_NULL();
        geom_out = geometry_serialize(lwgeom_out);
        lwgeom_free(lwgeom_out);
        PG_FREE_IF_COPY(geom_in, 0);
        PG_RETURN_POINTER(geom_out);
#endif
}

References buffer(), geometry_serialize(), lwgeom_free(), lwgeom_from_gserialized(), and mvt_geom().

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