backends: Export function to query the mapped MetaMonitorInfo of a tablet

Or NULL if the tablet is mapped to the full desktop size.

src/backends/meta-input-settings-private.h

@@ -105,6 +105,9 @@ MetaInputSettings * meta_input_settings_create (void);
 
 GSettings *           meta_input_settings_get_tablet_settings (MetaInputSettings  *settings,
                                                                ClutterInputDevice *device);
+MetaMonitorInfo *     meta_input_settings_get_tablet_monitor_info (MetaInputSettings  *settings,
+                                                                   ClutterInputDevice *device);
+
 GDesktopTabletMapping meta_input_settings_get_tablet_mapping (MetaInputSettings  *settings,
                                                               ClutterInputDevice *device);
 

src/backends/meta-input-settings.c

@@ -1294,6 +1294,30 @@ meta_input_settings_get_tablet_settings (MetaInputSettings  *settings,
   return info ? g_object_ref (info->settings) : NULL;
 }
 
+MetaMonitorInfo *
+meta_input_settings_get_tablet_monitor_info (MetaInputSettings  *settings,
+                                             ClutterInputDevice *device)
+{
+  MetaInputSettingsPrivate *priv;
+  DeviceMappingInfo *info;
+  MetaOutput *output;
+
+  g_return_val_if_fail (META_IS_INPUT_SETTINGS (settings), NULL);
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
+
+  priv = meta_input_settings_get_instance_private (settings);
+  info = g_hash_table_lookup (priv->mappable_devices, device);
+  if (!info)
+    return NULL;
+
+  output = meta_input_settings_find_output (settings, info->settings, device);
+
+  if (output && output->crtc)
+    return output->crtc->logical_monitor;
+
+  return NULL;
+}
+
 GDesktopTabletMapping
 meta_input_settings_get_tablet_mapping (MetaInputSettings  *settings,
                                         ClutterInputDevice *device)