monitor-manager: Remove 'scale' from MetaOutput

Replace the 'scale' of an output with a vfunc on the MetaMonitorManager
class that takes a monitor and a monitor mode which calculates the
scale. On X11 this always returns 1, on KMS, the old formula is used.
On the dummy and test backends, the already configured values are
returned.

https://bugzilla.gnome.org/show_bug.cgi?id=777732

src/backends/meta-logical-monitor.c

@@ -100,13 +100,20 @@ meta_logical_monitor_new_derived (MetaMonitorManager *monitor_manager,
 {
   MetaLogicalMonitor *logical_monitor;
   MetaOutput *main_output;
+  MetaMonitorMode *monitor_mode;
+  int scale;
 
   logical_monitor = g_object_new (META_TYPE_LOGICAL_MONITOR, NULL);
 
+  monitor_mode = meta_monitor_get_current_mode (monitor);
+  scale = meta_monitor_manager_calculate_monitor_mode_scale (monitor_manager,
+                                                             monitor,
+                                                             monitor_mode);
+
   main_output = meta_monitor_get_main_output (monitor);
   logical_monitor->number = monitor_number;
   logical_monitor->winsys_id = main_output->winsys_id;
-  logical_monitor->scale = main_output->scale;
+  logical_monitor->scale = scale;
   logical_monitor->in_fullscreen = -1;
   logical_monitor->rect = *layout;
 

src/backends/meta-monitor-config-manager.c

@@ -461,9 +461,10 @@ create_monitor_config (MetaMonitor     *monitor,
 }
 
 static MetaLogicalMonitorConfig *
-create_preferred_logical_monitor_config (MetaMonitor *monitor,
-                                         int          x,
-                                         int          y)
+create_preferred_logical_monitor_config (MetaMonitorManager *monitor_manager,
+                                         MetaMonitor        *monitor,
+                                         int                 x,
+                                         int                 y)
 {
   MetaMonitorMode *mode;
   int width, height;
@@ -473,7 +474,9 @@ create_preferred_logical_monitor_config (MetaMonitor *monitor,
 
   mode = meta_monitor_get_preferred_mode (monitor);
   meta_monitor_mode_get_resolution (mode, &width, &height);
-  scale = meta_monitor_get_calculated_scale (monitor);
+  scale = meta_monitor_manager_calculate_monitor_mode_scale (monitor_manager,
+                                                             monitor,
+                                                             mode);
 
   monitor_config = create_monitor_config (monitor, mode);
 
@@ -508,7 +511,9 @@ meta_monitor_config_manager_create_linear (MetaMonitorConfigManager *config_mana
     return NULL;
 
   primary_logical_monitor_config =
-    create_preferred_logical_monitor_config (primary_monitor, 0, 0);
+    create_preferred_logical_monitor_config (monitor_manager,
+                                             primary_monitor,
+                                             0, 0);
   primary_logical_monitor_config->is_primary = TRUE;
   logical_monitor_configs = g_list_append (NULL,
                                            primary_logical_monitor_config);
@@ -528,7 +533,9 @@ meta_monitor_config_manager_create_linear (MetaMonitorConfigManager *config_mana
         continue;
 
       logical_monitor_config =
-        create_preferred_logical_monitor_config (monitor, x, 0);
+        create_preferred_logical_monitor_config (monitor_manager,
+                                                 monitor,
+                                                 x, 0);
       logical_monitor_configs = g_list_append (logical_monitor_configs,
                                                logical_monitor_config);
 
@@ -551,7 +558,9 @@ meta_monitor_config_manager_create_fallback (MetaMonitorConfigManager *config_ma
     return NULL;
 
   primary_logical_monitor_config =
-    create_preferred_logical_monitor_config (primary_monitor, 0, 0);
+    create_preferred_logical_monitor_config (monitor_manager,
+                                             primary_monitor,
+                                             0, 0);
   primary_logical_monitor_config->is_primary = TRUE;
   logical_monitor_configs = g_list_append (NULL,
                                            primary_logical_monitor_config);
@@ -587,7 +596,9 @@ meta_monitor_config_manager_create_suggested (MetaMonitorConfigManager *config_m
         continue;
 
       logical_monitor_config =
-        create_preferred_logical_monitor_config (monitor, x, y);
+        create_preferred_logical_monitor_config (monitor_manager,
+                                                 monitor,
+                                                 x, y);
       logical_monitor_configs = g_list_append (logical_monitor_configs,
                                                logical_monitor_config);
 

src/backends/meta-monitor-manager-dummy.c

@@ -51,8 +51,16 @@ struct _MetaMonitorManagerDummyClass
   MetaMonitorManagerClass parent_class;
 };
 
+typedef struct _MetaOutputDummy
+{
+  int scale;
+} MetaOutputDummy;
+
 G_DEFINE_TYPE (MetaMonitorManagerDummy, meta_monitor_manager_dummy, META_TYPE_MONITOR_MANAGER);
 
+static void
+meta_output_dummy_notify_destroy (MetaOutput *output);
+
 #define array_last(a, t) \
   g_array_index (a, t, a->len - 1)
 
@@ -75,6 +83,7 @@ append_monitor (GArray *modes,
     }
   };
   MetaCrtc crtc;
+  MetaOutputDummy *output_dummy;
   MetaOutput output;
   unsigned int i;
 
@@ -88,6 +97,11 @@ append_monitor (GArray *modes,
   };
   g_array_append_val (crtcs, crtc);
 
+  output_dummy = g_new0 (MetaOutputDummy, 1);
+  *output_dummy = (MetaOutputDummy) {
+    .scale = scale
+  };
+
   output = (MetaOutput) {
     .winsys_id = outputs->len + 1,
     .name = g_strdup_printf ("LVDS%d", outputs->len + 1),
@@ -103,7 +117,9 @@ append_monitor (GArray *modes,
     .n_possible_clones = 0,
     .backlight = -1,
     .connector_type = META_CONNECTOR_TYPE_LVDS,
-    .scale = scale,
+    .driver_private = output_dummy,
+    .driver_notify =
+      (GDestroyNotify) meta_output_dummy_notify_destroy
   };
 
   output.modes = g_new0 (MetaCrtcMode *, G_N_ELEMENTS (modes_decl));
@@ -159,9 +175,15 @@ append_tiled_monitor (GArray *modes,
   tile_group_id = outputs->len + 1;
   for (i = 0; i < G_N_ELEMENTS (crtcs_decl); i++)
     {
+      MetaOutputDummy *output_dummy;
       MetaCrtcMode *preferred_mode;
       unsigned int j;
 
+      output_dummy = g_new0 (MetaOutputDummy, 1);
+      *output_dummy = (MetaOutputDummy) {
+        .scale = scale
+      };
+
       preferred_mode = &array_last (modes, MetaCrtcMode),
       output = (MetaOutput) {
         .winsys_id = outputs->len + 1,
@@ -187,7 +209,9 @@ append_tiled_monitor (GArray *modes,
           .tile_w = preferred_mode->width,
           .tile_h = preferred_mode->height
         },
-        .scale = scale
+        .driver_private = output_dummy,
+        .driver_notify =
+          (GDestroyNotify) meta_output_dummy_notify_destroy
       };
 
       output.modes = g_new0 (MetaCrtcMode *, G_N_ELEMENTS (modes_decl));
@@ -206,6 +230,12 @@ append_tiled_monitor (GArray *modes,
     }
 }
 
+static void
+meta_output_dummy_notify_destroy (MetaOutput *output)
+{
+  g_clear_pointer (&output->driver_private, g_free);
+}
+
 static void
 meta_monitor_manager_dummy_read_current (MetaMonitorManager *manager)
 {
@@ -533,6 +563,20 @@ meta_monitor_manager_dummy_is_transform_handled (MetaMonitorManager  *manager,
   return manager_dummy->is_transform_handled;
 }
 
+static int
+meta_monitor_manager_dummy_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                         MetaMonitor        *monitor,
+                                                         MetaMonitorMode    *monitor_mode)
+{
+  MetaOutput *output;
+  MetaOutputDummy *output_dummy;
+
+  output = meta_monitor_get_main_output (monitor);
+  output_dummy = output->driver_private;
+
+  return output_dummy->scale;
+}
+
 static void
 meta_monitor_manager_dummy_class_init (MetaMonitorManagerDummyClass *klass)
 {
@@ -543,6 +587,7 @@ meta_monitor_manager_dummy_class_init (MetaMonitorManagerDummyClass *klass)
   manager_class->apply_monitors_config = meta_monitor_manager_dummy_apply_monitors_config;
   manager_class->apply_configuration = meta_monitor_manager_dummy_apply_config;
   manager_class->is_transform_handled = meta_monitor_manager_dummy_is_transform_handled;
+  manager_class->calculate_monitor_mode_scale = meta_monitor_manager_dummy_calculate_monitor_mode_scale;
 }
 
 static void

src/backends/meta-monitor-manager-private.h

@@ -59,6 +59,8 @@ typedef struct _MetaMonitorTiled MetaMonitorTiled;
 typedef struct _MetaMonitorSpec MetaMonitorSpec;
 typedef struct _MetaLogicalMonitor MetaLogicalMonitor;
 
+typedef struct _MetaMonitorMode MetaMonitorMode;
+
 typedef struct _MetaCrtc MetaCrtc;
 typedef struct _MetaOutput MetaOutput;
 typedef struct _MetaCrtcMode MetaCrtcMode;
@@ -125,7 +127,6 @@ struct _MetaOutput
   int width_mm;
   int height_mm;
   CoglSubpixelOrder subpixel_order;
-  int scale;
 
   MetaConnectorType connector_type;
 
@@ -348,6 +349,10 @@ struct _MetaMonitorManagerClass
   gboolean (*is_transform_handled) (MetaMonitorManager  *,
                                     MetaCrtc            *,
                                     MetaMonitorTransform);
+
+  int (*calculate_monitor_mode_scale) (MetaMonitorManager *,
+                                       MetaMonitor        *,
+                                       MetaMonitorMode    *);
 };
 
 void                meta_monitor_manager_rebuild (MetaMonitorManager *manager,
@@ -447,6 +452,10 @@ void               meta_monitor_manager_lid_is_closed_changed (MetaMonitorManage
 
 gboolean           meta_monitor_manager_is_headless (MetaMonitorManager *manager);
 
+int                meta_monitor_manager_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                                      MetaMonitor        *monitor,
+                                                                      MetaMonitorMode    *monitor_mode);
+
 void meta_monitor_manager_clear_output (MetaOutput *output);
 void meta_monitor_manager_clear_mode (MetaCrtcMode *mode);
 void meta_monitor_manager_clear_crtc (MetaCrtc *crtc);

src/backends/meta-monitor-manager.c

@@ -275,6 +275,19 @@ meta_monitor_manager_is_headless (MetaMonitorManager *manager)
   return !manager->monitors;
 }
 
+int
+meta_monitor_manager_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                   MetaMonitor        *monitor,
+                                                   MetaMonitorMode    *monitor_mode)
+{
+  MetaMonitorManagerClass *manager_class =
+    META_MONITOR_MANAGER_GET_CLASS (manager);
+
+  return manager_class->calculate_monitor_mode_scale (manager,
+                                                      monitor,
+                                                      monitor_mode);
+}
+
 static void
 meta_monitor_manager_ensure_initial_config (MetaMonitorManager *manager)
 {

src/backends/meta-monitor.c

@@ -196,16 +196,6 @@ meta_monitor_is_underscanning (MetaMonitor *monitor)
   return output->is_underscanning;
 }
 
-int
-meta_monitor_get_calculated_scale (MetaMonitor *monitor)
-{
-  MetaOutput *output;
-
-  output = meta_monitor_get_main_output (monitor);
-
-  return output->scale;
-}
-
 gboolean
 meta_monitor_is_laptop_panel (MetaMonitor *monitor)
 {
@@ -291,6 +281,15 @@ meta_monitor_get_serial (MetaMonitor *monitor)
   return output->serial;
 }
 
+MetaConnectorType
+meta_monitor_get_connector_type (MetaMonitor *monitor)
+{
+  MetaOutput *output;
+
+  output = meta_monitor_get_main_output (monitor);
+  return output->connector_type;
+}
+
 static void
 meta_monitor_finalize (GObject *object)
 {

src/backends/meta-monitor.h

@@ -26,8 +26,6 @@
 
 #include "backends/meta-monitor-manager-private.h"
 
-typedef struct _MetaMonitorMode MetaMonitorMode;
-
 typedef struct _MetaMonitorSpec
 {
   char *connector;
@@ -97,8 +95,6 @@ gboolean meta_monitor_is_underscanning (MetaMonitor *monitor);
 
 gboolean meta_monitor_is_laptop_panel (MetaMonitor *monitor);
 
-int meta_monitor_get_calculated_scale (MetaMonitor *monitor);
-
 GList * meta_monitor_get_outputs (MetaMonitor *monitor);
 
 void meta_monitor_get_current_resolution (MetaMonitor *monitor,
@@ -121,6 +117,8 @@ const char * meta_monitor_get_product (MetaMonitor *monitor);
 
 const char * meta_monitor_get_serial (MetaMonitor *monitor);
 
+MetaConnectorType meta_monitor_get_connector_type (MetaMonitor *monitor);
+
 uint32_t meta_monitor_tiled_get_tile_group_id (MetaMonitorTiled *monitor_tiled);
 
 gboolean meta_monitor_get_suggested_position (MetaMonitor *monitor,

src/backends/native/meta-monitor-manager-kms.c

@@ -483,85 +483,6 @@ find_output_by_id (MetaOutput *outputs,
   return NULL;
 }
 
-/* The minimum resolution at which we turn on a window-scale of 2 */
-#define HIDPI_LIMIT 192
-
-/* The minimum screen height at which we turn on a window-scale of 2;
- * below this there just isn't enough vertical real estate for GNOME
- * apps to work, and it's better to just be tiny */
-#define HIDPI_MIN_HEIGHT 1200
-
-/* From http://en.wikipedia.org/wiki/4K_resolution#Resolutions_of_common_formats */
-#define SMALLEST_4K_WIDTH 3656
-
-/* Based on code from gnome-settings-daemon */
-static int
-compute_scale (MetaOutput *output)
-{
-  int scale = 1, width, height;
-
-  if (!output->crtc)
-    goto out;
-
-  width = output->crtc->rect.width;
-  height = output->crtc->rect.height;
-
-  /* Swap values on rotated transforms, so pixel and mm sizes
-   * from the same axes is compared.
-   */
-  if (meta_monitor_transform_is_rotated (output->crtc->transform))
-    {
-      int tmp = width;
-      width = height;
-      height = tmp;
-    }
-
-  /* Scaling makes no sense */
-  if (height < HIDPI_MIN_HEIGHT)
-    goto out;
-
-  /* 4K TV */
-  if (output->name != NULL && strstr(output->name, "HDMI") != NULL &&
-      width >= SMALLEST_4K_WIDTH)
-    goto out;
-
-  /* Somebody encoded the aspect ratio (16/9 or 16/10)
-   * instead of the physical size */
-  if ((output->width_mm == 160 && output->height_mm == 90) ||
-      (output->width_mm == 160 && output->height_mm == 100) ||
-      (output->width_mm == 16 && output->height_mm == 9) ||
-      (output->width_mm == 16 && output->height_mm == 10))
-    goto out;
-
-  if (output->width_mm > 0 && output->height_mm > 0)
-    {
-      double dpi_x, dpi_y;
-
-      dpi_x = (double)width / (output->width_mm / 25.4);
-      dpi_y = (double)height / (output->height_mm / 25.4);
-      /* We don't completely trust these values so both
-         must be high, and never pick higher ratio than
-         2 automatically */
-      if (dpi_x > HIDPI_LIMIT && dpi_y > HIDPI_LIMIT)
-        scale = 2;
-    }
-
-out:
-  return scale;
-}
-
-static int
-get_output_scale (MetaMonitorManager *manager,
-                  MetaOutput         *output)
-{
-  MetaMonitorManagerKms *manager_kms = META_MONITOR_MANAGER_KMS (manager);
-  int scale = g_settings_get_uint (manager_kms->desktop_settings, "scaling-factor");
-  if (scale > 0)
-    return scale;
-  else
-    return compute_scale (output);
-}
-
 static int
 find_property_index (MetaMonitorManager         *manager,
                      drmModeObjectPropertiesPtr  props,
@@ -930,8 +851,6 @@ init_output (MetaOutput         *output,
   /* MetaConnectorType matches DRM's connector types */
   output->connector_type = (MetaConnectorType) connector->connector_type;
 
-  output->scale = get_output_scale (manager, output);
-
   output_get_tile_info (manager_kms, output);
 
   /* FIXME: backlight is a very driver specific thing unfortunately,
@@ -1399,7 +1318,6 @@ apply_crtc_assignments (MetaMonitorManager *manager,
 
               output->is_dirty = TRUE;
               output->crtc = crtc;
-              output->scale = get_output_scale (manager, output);
             }
         }
 
@@ -1898,6 +1816,93 @@ meta_monitor_manager_kms_is_transform_handled (MetaMonitorManager  *manager,
     return FALSE;
 }
 
+/* The minimum resolution at which we turn on a window-scale of 2 */
+#define HIDPI_LIMIT 192
+
+/* The minimum screen height at which we turn on a window-scale of 2;
+ * below this there just isn't enough vertical real estate for GNOME
+ * apps to work, and it's better to just be tiny */
+#define HIDPI_MIN_HEIGHT 1200
+
+/* From http://en.wikipedia.org/wiki/4K_resolution#Resolutions_of_common_formats */
+#define SMALLEST_4K_WIDTH 3656
+
+static int
+compute_scale (MetaMonitor     *monitor,
+               MetaMonitorMode *monitor_mode)
+{
+  int resolution_width, resolution_height;
+  int width_mm, height_mm;
+  int scale;
+
+  scale = 1;
+
+  meta_monitor_mode_get_resolution (monitor_mode,
+                                    &resolution_width,
+                                    &resolution_height);
+
+  if (resolution_height < HIDPI_MIN_HEIGHT)
+    goto out;
+
+  /* 4K TV */
+  switch (meta_monitor_get_connector_type (monitor))
+    {
+    case META_CONNECTOR_TYPE_HDMIA:
+    case META_CONNECTOR_TYPE_HDMIB:
+      if (resolution_width >= SMALLEST_4K_WIDTH)
+        goto out;
+      break;
+    default:
+      break;
+    }
+
+  meta_monitor_get_physical_dimensions (monitor, &width_mm, &height_mm);
+
+  /*
+   * Somebody encoded the aspect ratio (16/9 or 16/10) instead of the physical
+   * size.
+   */
+  if ((width_mm == 160 && height_mm == 90) ||
+      (width_mm == 160 && height_mm == 100) ||
+      (width_mm == 16 && height_mm == 9) ||
+      (width_mm == 16 && height_mm == 10))
+    goto out;
+
+  if (width_mm > 0 && height_mm > 0)
+    {
+      double dpi_x, dpi_y;
+
+      dpi_x = (double) resolution_width / (width_mm / 25.4);
+      dpi_y = (double) resolution_height / (height_mm / 25.4);
+
+      /*
+       * We don't completely trust these values so both must be high, and never
+       * pick higher ratio than 2 automatically.
+       */
+      if (dpi_x > HIDPI_LIMIT && dpi_y > HIDPI_LIMIT)
+        scale = 2;
+    }
+
+out:
+  return scale;
+}
+
+static int
+meta_monitor_manager_kms_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                       MetaMonitor        *monitor,
+                                                       MetaMonitorMode    *monitor_mode)
+{
+  MetaMonitorManagerKms *manager_kms = META_MONITOR_MANAGER_KMS (manager);
+  int global_scale;
+
+  global_scale = g_settings_get_uint (manager_kms->desktop_settings,
+                                      "scaling-factor");
+  if (global_scale > 0)
+    return global_scale;
+  else
+    return compute_scale (monitor, monitor_mode);
+}
+
 static void
 meta_monitor_manager_kms_dispose (GObject *object)
 {
@@ -1938,4 +1943,5 @@ meta_monitor_manager_kms_class_init (MetaMonitorManagerKmsClass *klass)
   manager_class->get_crtc_gamma = meta_monitor_manager_kms_get_crtc_gamma;
   manager_class->set_crtc_gamma = meta_monitor_manager_kms_set_crtc_gamma;
   manager_class->is_transform_handled = meta_monitor_manager_kms_is_transform_handled;
+  manager_class->calculate_monitor_mode_scale = meta_monitor_manager_kms_calculate_monitor_mode_scale;
 }

src/backends/x11/meta-monitor-manager-xrandr.c

@@ -1568,6 +1568,15 @@ meta_monitor_manager_xrandr_is_transform_handled (MetaMonitorManager  *manager,
   return TRUE;
 }
 
+static int
+meta_monitor_manager_xrandr_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                          MetaMonitor        *monitor,
+                                                          MetaMonitorMode    *monitor_mode)
+{
+  /* X11 does not support anything other than scale 1. */
+  return 1;
+}
+
 static void
 meta_monitor_manager_xrandr_init (MetaMonitorManagerXrandr *manager_xrandr)
 {
@@ -1644,6 +1653,7 @@ meta_monitor_manager_xrandr_class_init (MetaMonitorManagerXrandrClass *klass)
   manager_class->tiled_monitor_removed = meta_monitor_manager_xrandr_tiled_monitor_removed;
 #endif
   manager_class->is_transform_handled = meta_monitor_manager_xrandr_is_transform_handled;
+  manager_class->calculate_monitor_mode_scale = meta_monitor_manager_xrandr_calculate_monitor_mode_scale;
 
   quark_meta_monitor_xrandr_data =
     g_quark_from_static_string ("-meta-monitor-xrandr-data");

src/tests/meta-monitor-manager-test.c

@@ -335,6 +335,20 @@ meta_monitor_manager_test_is_transform_handled (MetaMonitorManager  *manager,
   return TRUE;
 }
 
+static int
+meta_monitor_manager_test_calculate_monitor_mode_scale (MetaMonitorManager *manager,
+                                                        MetaMonitor        *monitor,
+                                                        MetaMonitorMode    *monitor_mode)
+{
+  MetaOutput *output;
+  MetaOutputTest *output_test;
+
+  output = meta_monitor_get_main_output (monitor);
+  output_test = output->driver_private;
+
+  return output_test->scale;
+}
+
 static void
 meta_monitor_manager_test_dispose (GObject *object)
 {
@@ -367,4 +381,5 @@ meta_monitor_manager_test_class_init (MetaMonitorManagerTestClass *klass)
   manager_class->tiled_monitor_added = meta_monitor_manager_test_tiled_monitor_added;
   manager_class->tiled_monitor_removed = meta_monitor_manager_test_tiled_monitor_removed;
   manager_class->is_transform_handled = meta_monitor_manager_test_is_transform_handled;
+  manager_class->calculate_monitor_mode_scale = meta_monitor_manager_test_calculate_monitor_mode_scale;
 }

src/tests/meta-monitor-manager-test.h

@@ -32,6 +32,11 @@ typedef struct _MetaMonitorTestSetup
   int n_crtcs;
 } MetaMonitorTestSetup;
 
+typedef struct _MetaOutputTest
+{
+  int scale;
+} MetaOutputTest;
+
 #define META_TYPE_MONITOR_MANAGER_TEST (meta_monitor_manager_test_get_type ())
 G_DECLARE_FINAL_TYPE (MetaMonitorManagerTest, meta_monitor_manager_test,
                       META, MONITOR_MANAGER_TEST, MetaMonitorManager)

src/tests/monitor-unit-tests.c

@@ -658,6 +658,12 @@ check_monitor_configuration (MonitorTestCase *test_case)
     }
 }
 
+static void
+meta_output_test_destroy_notify (MetaOutput *output)
+{
+  g_clear_pointer (&output->driver_private, g_free);
+}
+
 static MetaMonitorTestSetup *
 create_monitor_test_setup (MonitorTestCase *test_case,
                            MonitorTestFlag  flags)
@@ -712,6 +718,7 @@ create_monitor_test_setup (MonitorTestCase *test_case,
   test_setup->outputs = g_new0 (MetaOutput, test_setup->n_outputs);
   for (i = 0; i < test_setup->n_outputs; i++)
     {
+      MetaOutputTest *output_test;
       int crtc_index;
       MetaCrtc *crtc;
       int preferred_mode_index;
@@ -756,10 +763,16 @@ create_monitor_test_setup (MonitorTestCase *test_case,
           possible_crtcs[j] = &test_setup->crtcs[possible_crtc_index];
         }
 
+      output_test = g_new0 (MetaOutputTest, 1);
+
       scale = test_case->setup.outputs[i].scale;
       if (scale < 1)
         scale = 1;
 
+      *output_test = (MetaOutputTest) {
+        .scale = scale
+      };
+
       is_laptop_panel = test_case->setup.outputs[i].is_laptop_panel;
 
       test_setup->outputs[i] = (MetaOutput) {
@@ -789,8 +802,9 @@ create_monitor_test_setup (MonitorTestCase *test_case,
         .connector_type = (is_laptop_panel ? META_CONNECTOR_TYPE_eDP
                                            : META_CONNECTOR_TYPE_DisplayPort),
         .tile_info = test_case->setup.outputs[i].tile_info,
-        .scale = scale,
-        .is_underscanning = test_case->setup.outputs[i].is_underscanning
+        .is_underscanning = test_case->setup.outputs[i].is_underscanning,
+        .driver_private = output_test,
+        .driver_notify = (GDestroyNotify) meta_output_test_destroy_notify
       };
     }