polygonize_garray()

Datum polygonize_garray

(

PG_FUNCTION_ARGS

)

Definition at line 2924 of file postgis/lwgeom_geos.c.

{
        ArrayType *array;
        int is3d = 0;
        uint32 nelems, i;
        GSERIALIZED *result;
        GEOSGeometry *geos_result;
        const GEOSGeometry **vgeoms;
        int32_t srid = SRID_UNKNOWN;
#if POSTGIS_DEBUG_LEVEL >= 3
        static int call=1;
#endif
 
#if POSTGIS_DEBUG_LEVEL >= 3
        call++;
#endif
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        array = PG_GETARG_ARRAYTYPE_P(0);
        nelems = array_nelems_not_null(array);
 
        if (nelems == 0)
                PG_RETURN_NULL();
 
        POSTGIS_DEBUGF(3, "polygonize_garray: number of non-null elements: %d", nelems);
 
        /* Ok, we really need geos now ;) */
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        vgeoms = (const GEOSGeometry**) ARRAY2GEOS(array, nelems, &is3d, &srid);
 
        POSTGIS_DEBUG(3, "polygonize_garray: invoking GEOSpolygonize");
 
        geos_result = GEOSPolygonize(vgeoms, nelems);
 
        POSTGIS_DEBUG(3, "polygonize_garray: GEOSpolygonize returned");
 
        for (i=0; i<nelems; ++i) GEOSGeom_destroy((GEOSGeometry *)vgeoms[i]);
        pfree(vgeoms);
 
        if ( ! geos_result ) PG_RETURN_NULL();
 
        GEOSSetSRID(geos_result, srid);
        result = GEOS2POSTGIS(geos_result, is3d);
        GEOSGeom_destroy(geos_result);
        if (!result)
        {
                elog(ERROR, "%s returned an error", __func__);
                PG_RETURN_NULL(); /*never get here */
        }
 
        PG_RETURN_POINTER(result);
}

References ARRAY2GEOS(), array_nelems_not_null(), GEOS2POSTGIS(), lwgeom_geos_error(), result, and SRID_UNKNOWN.

Referenced by pgis_geometry_polygonize_finalfn().

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