static int lwpoly_calculate_gbox_cartesian(LWPOLY *poly, GBOX *gbox)
{
if ( ! poly ) return LW_FAILURE;
if ( poly->nrings == 0 ) return LW_FAILURE;
/* Just need to check outer ring */
return ptarray_calculate_gbox_cartesian( poly->rings[0], gbox );
}
static int lwtriangle_calculate_gbox_cartesian(LWTRIANGLE *triangle, GBOX *gbox)
{
if ( ! triangle ) return LW_FAILURE;
return ptarray_calculate_gbox_cartesian( triangle->points, gbox );
}
static int lwpoint_calculate_gbox_cartesian(LWPOINT *point, GBOX *gbox)
{
if ( ! point ) return LW_FAILURE;
return ptarray_calculate_gbox_cartesian( point->point, gbox );
}
static int lwline_calculate_gbox_cartesian(LWLINE *line, GBOX *gbox)
{
if ( ! line ) return LW_FAILURE;
return ptarray_calculate_gbox_cartesian( line->points, gbox );
}
Datum LWGEOM_interiorringn_polygon(PG_FUNCTION_ARGS)
{
GSERIALIZED *geom;
int32 wanted_index;
LWCURVEPOLY *curvepoly = NULL;
LWPOLY *poly = NULL;
POINTARRAY *ring;
LWLINE *line;
LWGEOM *lwgeom;
GSERIALIZED *result;
GBOX *bbox = NULL;
int type;
POSTGIS_DEBUG(2, "LWGEOM_interierringn_polygon called.");
wanted_index = PG_GETARG_INT32(1);
if ( wanted_index < 1 )
{
/* elog(ERROR, "InteriorRingN: ring number is 1-based"); */
PG_RETURN_NULL(); /* index out of range */
}
geom = (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
type = gserialized_get_type(geom);
if ( (type != POLYGONTYPE) && (type != CURVEPOLYTYPE) )
{
elog(ERROR, "InteriorRingN: geom is not a polygon");
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_NULL();
}
lwgeom = lwgeom_from_gserialized(geom);
if( lwgeom_is_empty(lwgeom) )
{
lwpoly_free(poly);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_NULL();
}
if ( type == POLYGONTYPE)
{
poly = lwgeom_as_lwpoly(lwgeom_from_gserialized(geom));
/* Ok, now we have a polygon. Let's see if it has enough holes */
if ( wanted_index >= poly->nrings )
{
lwpoly_free(poly);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_NULL();
}
ring = poly->rings[wanted_index];
/* COMPUTE_BBOX==TAINTING */
if ( poly->bbox )
{
bbox = lwalloc(sizeof(GBOX));
ptarray_calculate_gbox_cartesian(ring, bbox);
}
/* This is a LWLINE constructed by interior ring POINTARRAY */
line = lwline_construct(poly->srid, bbox, ring);
result = geometry_serialize((LWGEOM *)line);
lwline_release(line);
lwpoly_free(poly);
}
else
{
curvepoly = lwgeom_as_lwcurvepoly(lwgeom_from_gserialized(geom));
if (wanted_index >= curvepoly->nrings)
{
PG_FREE_IF_COPY(geom, 0);
lwgeom_release((LWGEOM *)curvepoly);
PG_RETURN_NULL();
}
result = geometry_serialize(curvepoly->rings[wanted_index]);
lwgeom_free((LWGEOM*)curvepoly);
}
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_POINTER(result);
}