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stage: Add sanity checks for get_pending_swaps()

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The master clock might have a Stage during its destruction phase,
without a StageWindow attached to it. If this happens and we try
to dereference the StageWindow to get its class and call a virtual
function we might experience some slight turbulence and... then...
explode.

http://bugzilla.openedhand.com/show_bug.cgi?id=1987
This commit is contained in:
Emmanuele Bassi 2010-02-15 12:04:50 +00:00
parent fef82fae5c
commit 2229cafc38
2 changed files with 22 additions and 9 deletions
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21
clutter/clutter-master-clock.c
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@ -129,11 +129,14 @@ master_clock_is_running (ClutterMasterClock *master_clock)
/* If all of the stages are busy waiting for a swap-buffers to complete
* then we stop the master clock... */
for (l = stages; l != NULL; l = l->next)
if (_clutter_stage_get_pending_swaps (l->data) == 0)
{
stage_free = TRUE;
break;
}
{
if (_clutter_stage_get_pending_swaps (l->data) == 0)
{
stage_free = TRUE;
break;
}
}
if (!stage_free)
return FALSE;
@ -141,9 +144,11 @@ master_clock_is_running (ClutterMasterClock *master_clock)
return TRUE;
for (l = stages; l; l = l->next)
if (_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
return TRUE;
{
if (_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
return TRUE;
}
if (master_clock->ensure_next_iteration)
{

10
clutter/clutter-stage.c
View File

@ -2393,7 +2393,15 @@ clutter_stage_get_minimum_size (ClutterStage *stage,
int
_clutter_stage_get_pending_swaps (ClutterStage *stage)
{
ClutterStageWindow *stage_window = _clutter_stage_get_window (stage);
ClutterStageWindow *stage_window;
if (CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_IN_DESTRUCTION)
return 0;
stage_window = _clutter_stage_get_window (stage);
if (stage_window == NULL)
return 0;
return _clutter_stage_window_get_pending_swaps (stage_window);
}