LWGEOM_makepoly()

Datum LWGEOM_makepoly

(

PG_FUNCTION_ARGS

)

Definition at line 1536 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *pglwg1;
        ArrayType *array=NULL;
        GSERIALIZED *result=NULL;
        const LWLINE *shell=NULL;
        const LWLINE **holes=NULL;
        LWPOLY *outpoly;
        uint32 nholes=0;
        uint32 i;
        size_t offset=0;
 
        POSTGIS_DEBUG(2, "LWGEOM_makepoly called.");
 
        /* Get input shell */
        pglwg1 = PG_GETARG_GSERIALIZED_P(0);
        if ( gserialized_get_type(pglwg1) != LINETYPE )
        {
                lwpgerror("Shell is not a line");
        }
        shell = lwgeom_as_lwline(lwgeom_from_gserialized(pglwg1));
 
        /* Get input holes if any */
        if ( PG_NARGS() > 1 )
        {
                array = PG_GETARG_ARRAYTYPE_P(1);
                nholes = ArrayGetNItems(ARR_NDIM(array), ARR_DIMS(array));
                holes = lwalloc(sizeof(LWLINE *)*nholes);
                for (i=0; i<nholes; i++)
                {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-compare"
                        GSERIALIZED *g = (GSERIALIZED *)(ARR_DATA_PTR(array)+offset);
#pragma GCC diagnostic pop
                        LWLINE *hole;
                        offset += INTALIGN(VARSIZE(g));
                        if ( gserialized_get_type(g) != LINETYPE )
                        {
                                lwpgerror("Hole %d is not a line", i);
                        }
                        hole = lwgeom_as_lwline(lwgeom_from_gserialized(g));
                        holes[i] = hole;
                }
        }
 
        outpoly = lwpoly_from_lwlines(shell, nholes, holes);
        POSTGIS_DEBUGF(3, "%s", lwgeom_summary((LWGEOM*)outpoly, 0));
        result = geometry_serialize((LWGEOM *)outpoly);
 
        lwline_free((LWLINE*)shell);
        PG_FREE_IF_COPY(pglwg1, 0);
 
        for (i=0; i<nholes; i++)
        {
                lwline_free((LWLINE*)holes[i]);
        }
 
        PG_RETURN_POINTER(result);
}

References geometry_serialize(), gserialized_get_type(), LINETYPE, lwalloc(), lwgeom_as_lwline(), lwgeom_from_gserialized(), lwgeom_summary(), lwline_free(), and lwpoly_from_lwlines().

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