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monitor-manager: Find active monitor when deriving global scale

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When deriving the global scale directly from the current hardware state
(as done when using the X11 backend) we are inspecting the logical
state they had prior to the most recent hot plug. That means that a
primary monitor might have been disabled, and a new primary monitor may
not have been assigned yet.

Stop assuming a primary monitor has an active mode before having
reconstructed the logical state by finding some active monitor if the
old primary monitor was disabled. This avoids a crash when trying to
derive the global scale from a disabled monitor.

Closes: https://gitlab.gnome.org/GNOME/mutter/issues/130


(cherry picked from commit 0b3a1c9c31)
This commit is contained in:
Jonas Ådahl 2018-04-25 10:43:11 +02:00 committed by Marco Trevisan
parent 928a40f328
commit 1b439c42d1
1 changed files with 17 additions and 4 deletions
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21
src/backends/meta-monitor-manager.c
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@ -89,6 +89,9 @@ static gboolean
meta_monitor_manager_is_config_complete (MetaMonitorManager *manager,
MetaMonitorsConfig *config);
static MetaMonitor *
meta_monitor_manager_get_active_monitor (MetaMonitorManager *manager);
MetaBackend *
meta_monitor_manager_get_backend (MetaMonitorManager *manager)
{
@ -198,13 +201,17 @@ calculate_monitor_scale (MetaMonitorManager *manager,
static float
derive_calculated_global_scale (MetaMonitorManager *manager)
{
MetaMonitor *primary_monitor;
MetaMonitor *monitor = NULL;
primary_monitor = meta_monitor_manager_get_primary_monitor (manager);
if (!primary_monitor)
monitor = meta_monitor_manager_get_primary_monitor (manager);
if (!monitor || !meta_monitor_is_active (monitor))
monitor = meta_monitor_manager_get_active_monitor (manager);
if (!monitor)
return 1.0;
return calculate_monitor_scale (manager, primary_monitor);
return calculate_monitor_scale (manager, monitor);
}
static float
@ -2378,6 +2385,12 @@ meta_monitor_manager_get_laptop_panel (MetaMonitorManager *manager)
return find_monitor (manager, meta_monitor_is_laptop_panel);
}
static MetaMonitor *
meta_monitor_manager_get_active_monitor (MetaMonitorManager *manager)
{
return find_monitor (manager, meta_monitor_is_active);
}
MetaMonitor *
meta_monitor_manager_get_monitor_from_connector (MetaMonitorManager *manager,
const char *connector)