BOX3D_combine()

Datum BOX3D_combine

(

PG_FUNCTION_ARGS

)

Definition at line 464 of file lwgeom_box3d.c.

{
        BOX3D *box = (BOX3D *)PG_GETARG_POINTER(0);
        GSERIALIZED *geom = PG_ARGISNULL(1) ? NULL : (GSERIALIZED *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
        LWGEOM *lwgeom = NULL;
        BOX3D *result = NULL;
        GBOX gbox;
        int32_t srid;
        int rv;
 
        /* Can't do anything with null inputs */
        if (!box && !geom)
        {
                PG_RETURN_NULL();
        }
        /* Null geometry but non-null box, return the box */
        else if (!geom)
        {
                result = palloc(sizeof(BOX3D));
                memcpy(result, box, sizeof(BOX3D));
                PG_RETURN_POINTER(result);
        }
 
        /*
         * Deserialize geometry and *calculate* the box
         * We can't use the cached box because it's float, we *must* calculate
         */
        lwgeom = lwgeom_from_gserialized(geom);
        srid = lwgeom->srid;
        rv = lwgeom_calculate_gbox(lwgeom, &gbox);
        lwgeom_free(lwgeom);
 
        /* If we couldn't calculate the box, return what we know */
        if (rv == LW_FAILURE)
        {
                PG_FREE_IF_COPY(geom, 1);
                /* No geom box, no input box, so null return */
                if (!box)
                        PG_RETURN_NULL();
                result = palloc(sizeof(BOX3D));
                memcpy(result, box, sizeof(BOX3D));
                PG_RETURN_POINTER(result);
        }
 
        /* Null box and non-null geometry, just return the geometry box */
        if (!box)
        {
                PG_FREE_IF_COPY(geom, 1);
                result = box3d_from_gbox(&gbox);
                result->srid = srid;
                PG_RETURN_POINTER(result);
        }
 
        result = palloc(sizeof(BOX3D));
        result->xmax = Max(box->xmax, gbox.xmax);
        result->ymax = Max(box->ymax, gbox.ymax);
        result->zmax = Max(box->zmax, gbox.zmax);
        result->xmin = Min(box->xmin, gbox.xmin);
        result->ymin = Min(box->ymin, gbox.ymin);
        result->zmin = Min(box->zmin, gbox.zmin);
        result->srid = srid;
 
        PG_FREE_IF_COPY(geom, 1);
        PG_RETURN_POINTER(result);
}

References box3d_from_gbox(), LW_FAILURE, lwgeom_calculate_gbox(), lwgeom_free(), lwgeom_from_gserialized(), result, LWGEOM::srid, BOX3D::xmax, GBOX::xmax, BOX3D::xmin, GBOX::xmin, BOX3D::ymax, GBOX::ymax, BOX3D::ymin, GBOX::ymin, BOX3D::zmax, GBOX::zmax, BOX3D::zmin, and GBOX::zmin.

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