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meta-monitor-manager-xrandr: Simplify handle_xevent

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The code here was a bit messy with the addition of
hotplug_mode_update, and the comments were a bit confusing and
inaccurate. Clean it up and comment it a bit better to make the flow and
intention more clear.
This commit is contained in:
Jasper St. Pierre 2014-10-03 15:10:53 -06:00
parent fa58752276
commit e7356917b0
1 changed files with 23 additions and 29 deletions
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52
src/backends/x11/meta-monitor-manager-xrandr.c
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@ -1075,6 +1075,7 @@ meta_monitor_manager_xrandr_handle_xevent (MetaMonitorManagerXrandr *manager_xra
MetaMonitorMode *old_modes;
unsigned int n_old_outputs, n_old_modes;
gboolean new_config;
gboolean applied_config = FALSE;
if ((event->type - manager_xrandr->rr_event_base) != RRScreenChangeNotify)
return FALSE;
@ -1091,39 +1092,32 @@ meta_monitor_manager_xrandr_handle_xevent (MetaMonitorManagerXrandr *manager_xra
manager->serial++;
meta_monitor_manager_xrandr_read_current (manager);
new_config = manager_xrandr->resources->timestamp >=
manager_xrandr->resources->configTimestamp;
if (meta_monitor_manager_has_hotplug_mode_update (manager))
new_config = manager_xrandr->resources->timestamp >= manager_xrandr->resources->configTimestamp;
/* If this is the X server telling us we set a new configuration,
* we can simply short-cut to rebuilding our logical configuration.
*/
if (new_config || meta_monitor_config_match_current (manager->config, manager))
{
/* Check if the current intended configuration is a result of an
XRandR call. Otherwise, hotplug_mode_update tells us to get
a new preferred mode on hotplug events to handle dynamic
guest resizing. */
if (new_config)
meta_monitor_manager_xrandr_rebuild_derived (manager);
else
meta_monitor_config_make_default (manager->config, manager);
}
else
{
/* Check if the current intended configuration has the same outputs
as the new real one, or if the event is a result of an XRandR call.
If so, we can go straight to rebuild the logical config and tell
the outside world.
Otherwise, this event was caused by hotplug, so give a chance to
MetaMonitorConfig.
Note that we need to check both the timestamps and the list of
outputs, because the X server might emit spurious events with new
configTimestamps (bug 702804), and the driver may have changed
the EDID for some other reason (old qxl and vbox drivers). */
if (new_config || meta_monitor_config_match_current (manager->config, manager))
meta_monitor_manager_xrandr_rebuild_derived (manager);
else if (!meta_monitor_config_apply_stored (manager->config, manager))
meta_monitor_config_make_default (manager->config, manager);
meta_monitor_manager_xrandr_rebuild_derived (manager);
goto out;
}
/* If the monitor has hotplug_mode_update (which is used by VMs), don't bother
* applying our stored configuration, because it's likely the user just resizing
* the window.
*/
if (!meta_monitor_manager_has_hotplug_mode_update (manager))
{
if (meta_monitor_config_apply_stored (manager->config, manager))
applied_config = TRUE;
}
/* If we haven't applied any configuration, apply the default configuration. */
if (!applied_config)
meta_monitor_config_make_default (manager->config, manager);
out:
meta_monitor_manager_free_output_array (old_outputs, n_old_outputs);
meta_monitor_manager_free_mode_array (old_modes, n_old_modes);
g_free (old_crtcs);