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Add comments and whitespace to repaint machinery

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repaint_needed / repaint_scheduled are surprisingly subtle. Explode the
conditional with side-effects into more obvious separate calls, and
document what they do.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Daniel Stone 2017-01-16 15:38:54 +00:00
parent 1298073b5a
commit cd1a1c34f8
1 changed files with 21 additions and 6 deletions
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27
libweston/compositor.c
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@ -2335,15 +2335,30 @@ output_repaint_timer_handler(void *data)
{
struct weston_output *output = data;
struct weston_compositor *compositor = output->compositor;
int ret;
if (output->repaint_needed &&
compositor->state != WESTON_COMPOSITOR_SLEEPING &&
compositor->state != WESTON_COMPOSITOR_OFFSCREEN &&
weston_output_repaint(output) == 0)
return 0;
/* If we're sleeping, drop the repaint machinery entirely; we will
* explicitly repaint all outputs when we come back. */
if (compositor->state == WESTON_COMPOSITOR_SLEEPING ||
compositor->state == WESTON_COMPOSITOR_OFFSCREEN)
goto err;
/* We don't actually need to repaint this output; drop it from
* repaint until something causes damage. */
if (!output->repaint_needed)
goto err;
/* If repaint fails, we aren't going to get weston_output_finish_frame
* to trigger a new repaint, so drop it from repaint and hope
* something later schedules a successful repaint. */
ret = weston_output_repaint(output);
if (ret != 0)
goto err;
return 0;
err:
weston_output_schedule_repaint_reset(output);
return 0;
}