gidx_contains()

bool gidx_contains	(	GIDX *	a,
		GIDX *	b
	)

Definition at line 451 of file gserialized_gist_nd.c.

{
        int i, dims_a, dims_b;
 
        POSTGIS_DEBUG(5, "entered function");
 
        if ( (a == NULL) || (b == NULL) ) return false;
 
        if ( gidx_is_unknown(a) || gidx_is_unknown(b) )
                return false;
 
        dims_a = GIDX_NDIMS(a);
        dims_b = GIDX_NDIMS(b);
 
        if ( dims_a < dims_b )
        {
                /*
                ** If (b) is of higher dimensionality than (a) it can only be contained
                ** if those higher dimensions are zeroes.
                */
                for (i = dims_a; i < dims_b; i++)
                {
                        if ( GIDX_GET_MIN(b,i) != 0 )
                                return false;
                        if ( GIDX_GET_MAX(b,i) != 0 )
                                return false;
                }
        }
 
        /* Excess dimensions of (a), don't matter, it just has to contain (b) in (b)'s dimensions */
        for (i = 0; i < Min(dims_a, dims_b); i++)
        {
                if ( GIDX_GET_MIN(a,i) > GIDX_GET_MIN(b,i) )
                        return false;
                if ( GIDX_GET_MAX(a,i) < GIDX_GET_MAX(b,i) )
                        return false;
        }
 
        return true;
}

References gidx_is_unknown().

Referenced by gidx_brin_inclusion_add_value(), gserialized_contains(), gserialized_gidx_geom_contains(), gserialized_gidx_geom_within(), gserialized_gidx_gidx_contains(), gserialized_gidx_gidx_within(), gserialized_gist_consistent_internal(), gserialized_gist_consistent_leaf(), and gserialized_within().

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