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monitor-manager: Check if all monitor scales are matching in global mode

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When global scaling is set we need to ensure that all the requested scale
configurations are matching, otherwise we'd end up in a mixed setup that
we don't support in this scenario.

Fixes https://gitlab.gnome.org/GNOME/mutter/issues/407

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/336>
This commit is contained in:
Marco Trevisan (Treviño) 2018-11-29 23:04:17 -05:00
parent 1ac63fcd77
commit 7c87c1c24f
1 changed files with 46 additions and 5 deletions
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51
src/backends/meta-monitor-manager.c
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@ -125,6 +125,10 @@ meta_monitor_manager_get_active_monitor (MetaMonitorManager *manager);
static void
meta_monitor_manager_real_read_current_state (MetaMonitorManager *manager);
static gboolean
is_global_scale_matching_in_config (MetaMonitorsConfig *config,
float scale);
MetaBackend *
meta_monitor_manager_get_backend (MetaMonitorManager *manager)
{
@ -1761,6 +1765,43 @@ meta_monitor_manager_is_scale_supported (MetaMonitorManager *manager,
return FALSE;
}
static gboolean
is_global_scale_matching_in_config (MetaMonitorsConfig *config,
float scale)
{
GList *l;
for (l = config->logical_monitor_configs; l; l = l->next)
{
MetaLogicalMonitorConfig *logical_monitor_config = l->data;
if (!G_APPROX_VALUE (logical_monitor_config->scale, scale, FLT_EPSILON))
return FALSE;
}
return TRUE;
}
static gboolean
meta_monitor_manager_is_scale_supported_for_config (MetaMonitorManager *manager,
MetaMonitorsConfig *config,
MetaMonitor *monitor,
MetaMonitorMode *monitor_mode,
float scale)
{
if (meta_monitor_manager_is_scale_supported (manager, config->layout_mode,
monitor, monitor_mode, scale))
{
if (meta_monitor_manager_get_capabilities (manager) &
META_MONITOR_MANAGER_CAPABILITY_GLOBAL_SCALE_REQUIRED)
return is_global_scale_matching_in_config (config, scale);
return TRUE;
}
return FALSE;
}
static gboolean
meta_monitor_manager_is_config_applicable (MetaMonitorManager *manager,
MetaMonitorsConfig *config,
@ -1799,11 +1840,11 @@ meta_monitor_manager_is_config_applicable (MetaMonitorManager *manager,
return FALSE;
}
if (!meta_monitor_manager_is_scale_supported (manager,
config->layout_mode,
monitor,
monitor_mode,
scale))
if (!meta_monitor_manager_is_scale_supported_for_config (manager,
config,
monitor,
monitor_mode,
scale))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Scale not supported by backend");