b435e2aac1
This allows ddx to set swap_limit if there is more than one back buffer for drawable. Setting swap_limit has to also check if change affects a client that is blocked. This can be used to implement N-buffering in driver with minimal logic in allocation and selecting next back. Signed-off-by: Pauli Nieminen <ext-pauli.nieminen@nokia.com> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: Francisco Jerez <currojerez@riseup.net> Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de> Signed-off-by: Keith Packard <keithp@keithp.com>