/* Clone LWCIRCSTRING object. POINTARRAY is not copied. */
LWCIRCSTRING *
lwcircstring_clone(const LWCIRCSTRING *g)
{
LWCIRCSTRING *ret = lwalloc(sizeof(LWCIRCSTRING));
memcpy(ret, g, sizeof(LWCIRCSTRING));
if (g->bbox) ret->bbox = box2d_clone(g->bbox);
return ret;
}
/* Clone LWPOINT object. POINTARRAY is not copied. */
LWPOINT *
lwpoint_clone(const LWPOINT *g)
{
LWPOINT *ret = lwalloc(sizeof(LWPOINT));
LWDEBUG(2, "lwpoint_clone called");
memcpy(ret, g, sizeof(LWPOINT));
if ( g->bbox ) ret->bbox = box2d_clone(g->bbox);
return ret;
}
/* Clone LWLINE object. POINTARRAY is not copied. */
LWLINE *
lwline_clone(const LWLINE *g)
{
LWLINE *ret = lwalloc(sizeof(LWLINE));
LWDEBUGF(2, "lwline_clone called with %p", g);
memcpy(ret, g, sizeof(LWLINE));
if ( g->bbox ) ret->bbox = box2d_clone(g->bbox);
return ret;
}
Datum LWGEOM_exteriorring_polygon(PG_FUNCTION_ARGS)
{
PG_LWGEOM *geom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
LWPOLY *poly = NULL;
LWCURVEPOLY *curvepoly = NULL;
POINTARRAY *extring;
LWGEOM *ring;
LWLINE *line;
PG_LWGEOM *result;
BOX2DFLOAT4 *bbox=NULL;
POSTGIS_DEBUG(2, "LWGEOM_exteriorring_polygon called.");
if ( TYPE_GETTYPE(geom->type) != POLYGONTYPE &&
TYPE_GETTYPE(geom->type) != CURVEPOLYTYPE)
{
elog(ERROR, "ExteriorRing: geom is not a polygon");
PG_RETURN_NULL();
}
if (lwgeom_getType((uchar)SERIALIZED_FORM(geom)[0]) == POLYGONTYPE)
{
poly = lwpoly_deserialize(SERIALIZED_FORM(geom));
/* Ok, now we have a polygon. Here is its exterior ring. */
extring = poly->rings[0];
/*
* This is a LWLINE constructed by exterior ring POINTARRAY
* If the input geom has a bbox, use it for
* the output geom, as exterior ring makes it up !
*/
if ( poly->bbox ) bbox=box2d_clone(poly->bbox);
line = lwline_construct(poly->SRID, bbox, extring);
result = pglwgeom_serialize((LWGEOM *)line);
lwgeom_release((LWGEOM *)line);
lwgeom_release((LWGEOM *)poly);
}
else
{
curvepoly = lwcurvepoly_deserialize(SERIALIZED_FORM(geom));
ring = curvepoly->rings[0];
result = pglwgeom_serialize(ring);
lwgeom_release(ring);
}
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_POINTER(result);
}
