lwpoly_make_geos_friendly()

LWGEOM * lwpoly_make_geos_friendly

(

LWPOLY *

poly

)

Definition at line 229 of file liblwgeom/lwgeom_geos_clean.c.

References lwalloc(), LWDEBUGF, lwfree(), POINTARRAY::npoints, LWPOLY::nrings, ptarray_free(), ring_make_geos_friendly(), and LWPOLY::rings.

Referenced by LWGEOM_GEOS_getPointN(), and lwgeom_make_geos_friendly().

{
        LWGEOM* ret;
        POINTARRAY **new_rings;
        int i;

        /* If the polygon has no rings there's nothing to do */
        if ( ! poly->nrings ) return (LWGEOM*)poly;

        /* Allocate enough pointers for all rings */
        new_rings = lwalloc(sizeof(POINTARRAY*)*poly->nrings);

        /* All rings must be closed and have > 3 points */
        for (i=0; i<poly->nrings; i++)
        {
                POINTARRAY* ring_in = poly->rings[i];
                POINTARRAY* ring_out = ring_make_geos_friendly(ring_in);

                if ( ring_in != ring_out )
                {
                        LWDEBUGF(3, "lwpoly_make_geos_friendly: ring %d cleaned, now has %d points", i, ring_out->npoints);
                        ptarray_free(ring_in);
                }
                else
                {
                        LWDEBUGF(3, "lwpoly_make_geos_friendly: ring %d untouched", i);
                }

                assert ( ring_out );
                new_rings[i] = ring_out;
        }

        lwfree(poly->rings);
        poly->rings = new_rings;
        ret = (LWGEOM*)poly;

        return ret;
}

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