Reviewed-By: Derek Foreman <[email protected]>

On 19/03/15 05:33 AM, Pekka Paalanen wrote:
> From: Pekka Paalanen <[email protected]>
> 
> Make the sanity check more explicit and log a warning if it happens.
> 
> Small negative values are ok because it just means the compositor is
> lagging behind, or more likely the user specified a too long repaint
> window.
> 
> Signed-off-by: Pekka Paalanen <[email protected]>
> ---
>  src/compositor.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/src/compositor.c b/src/compositor.c
> index 3f6aa7d..be2309a 100644
> --- a/src/compositor.c
> +++ b/src/compositor.c
> @@ -2412,8 +2412,18 @@ weston_output_finish_frame(struct weston_output 
> *output,
>       msec = (refresh_nsec - timespec_to_nsec(&gone)) / 1000000; /* floor */
>       msec -= compositor->repaint_msec;
>  
> -     /* Also sanity check. */
> -     if (msec < 1 || msec > 1000)
> +     if (msec < -1000 || msec > 1000) {
> +             static bool warned;
> +
> +             if (!warned)
> +                     weston_log("Warning: computed repaint delay is "
> +                                "insane: %d msec\n", msec);
> +             warned = true;
> +
> +             msec = 0;
> +     }
> +
> +     if (msec < 1)
>               output_repaint_timer_handler(output);
>       else
>               wl_event_source_timer_update(output->repaint_timer, msec);
> 

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