[mutter/gnome-3-28] backends: Add logical monitor -> monitor -> output -> crtc ref chain

[Marco Trevisan <marcotrevi src gnome org>]

commit fe1616668e9d82e87f6c518b3b4bacff3afefdf7
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Nov 3 11:27:57 2017 +0100

    backends: Add logical monitor -> monitor -> output -> crtc ref chain
    
    Make it so that each logical monitor has a reference to all the
    monitors that are assigned to it.
    
    All monitors has a reference to each output that belongs to it.
    
    Each output has a reference to any CRTC it has been assigned.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786929
    
    
    (cherry picked from commit 768ec15ea072df21dd6caeb2507d41223ade9116)

 src/backends/meta-logical-monitor.c | 14 +++++++++-----
 src/backends/meta-monitor.c         | 22 +++++++++++++++++++---
 src/backends/meta-output.c          | 16 ++++++++++++++--
 3 files changed, 42 insertions(+), 10 deletions(-)
---
diff --git a/src/backends/meta-logical-monitor.c b/src/backends/meta-logical-monitor.c
index 3f6986880..693c83dcb 100644
--- a/src/backends/meta-logical-monitor.c
+++ b/src/backends/meta-logical-monitor.c
@@ -146,7 +146,7 @@ meta_logical_monitor_add_monitor (MetaLogicalMonitor *logical_monitor,
 
   is_presentation = logical_monitor->is_presentation;
   logical_monitor->monitors = g_list_append (logical_monitor->monitors,
-                                             monitor);
+                                             g_object_ref (monitor));
 
   for (l = logical_monitor->monitors; l; l = l->next)
     {
@@ -257,13 +257,17 @@ meta_logical_monitor_init (MetaLogicalMonitor *logical_monitor)
 }
 
 static void
-meta_logical_monitor_finalize (GObject *object)
+meta_logical_monitor_dispose (GObject *object)
 {
   MetaLogicalMonitor *logical_monitor = META_LOGICAL_MONITOR (object);
 
-  g_list_free (logical_monitor->monitors);
+  if (logical_monitor->monitors)
+    {
+      g_list_free_full (logical_monitor->monitors, g_object_unref);
+      logical_monitor->monitors = NULL;
+    }
 
-  G_OBJECT_CLASS (meta_logical_monitor_parent_class)->finalize (object);
+  G_OBJECT_CLASS (meta_logical_monitor_parent_class)->dispose (object);
 }
 
 static void
@@ -271,7 +275,7 @@ meta_logical_monitor_class_init (MetaLogicalMonitorClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
-  object_class->finalize = meta_logical_monitor_finalize;
+  object_class->dispose = meta_logical_monitor_dispose;
 }
 
 gboolean
diff --git a/src/backends/meta-monitor.c b/src/backends/meta-monitor.c
index 1e1af3950..98330661e 100644
--- a/src/backends/meta-monitor.c
+++ b/src/backends/meta-monitor.c
@@ -387,6 +387,21 @@ meta_monitor_crtc_to_logical_transform (MetaMonitor          *monitor,
   return new_transform;
 }
 
+static void
+meta_monitor_dispose (GObject *object)
+{
+  MetaMonitor *monitor = META_MONITOR (object);
+  MetaMonitorPrivate *priv = meta_monitor_get_instance_private (monitor);
+
+  if (priv->outputs)
+    {
+      g_list_free_full (priv->outputs, g_object_unref);
+      priv->outputs = NULL;
+    }
+
+  G_OBJECT_CLASS (meta_monitor_parent_class)->dispose (object);
+}
+
 static void
 meta_monitor_finalize (GObject *object)
 {
@@ -395,7 +410,6 @@ meta_monitor_finalize (GObject *object)
 
   g_hash_table_destroy (priv->mode_ids);
   g_list_free_full (priv->modes, (GDestroyNotify) meta_monitor_mode_free);
-  g_clear_pointer (&priv->outputs, g_list_free);
   meta_monitor_spec_free (priv->spec);
 
   G_OBJECT_CLASS (meta_monitor_parent_class)->finalize (object);
@@ -414,6 +428,7 @@ meta_monitor_class_init (MetaMonitorClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
+  object_class->dispose = meta_monitor_dispose;
   object_class->finalize = meta_monitor_finalize;
 }
 
@@ -550,7 +565,7 @@ meta_monitor_normal_new (MetaGpu    *gpu,
 
   monitor_priv->gpu = gpu;
 
-  monitor_priv->outputs = g_list_append (NULL, output);
+  monitor_priv->outputs = g_list_append (NULL, g_object_ref (output));
   monitor_priv->winsys_id = output->winsys_id;
   meta_monitor_generate_spec (monitor);
 
@@ -665,7 +680,8 @@ add_tiled_monitor_outputs (MetaGpu          *gpu,
       g_warn_if_fail (output->subpixel_order ==
                       monitor_tiled->origin_output->subpixel_order);
 
-      monitor_priv->outputs = g_list_append (monitor_priv->outputs, output);
+      monitor_priv->outputs = g_list_append (monitor_priv->outputs,
+                                             g_object_ref (output));
     }
 }
 
diff --git a/src/backends/meta-output.c b/src/backends/meta-output.c
index b5ecccd2b..2139a17a3 100644
--- a/src/backends/meta-output.c
+++ b/src/backends/meta-output.c
@@ -43,7 +43,7 @@ meta_output_assign_crtc (MetaOutput *output,
 
   g_assert (crtc);
 
-  priv->crtc = crtc;
+  g_set_object (&priv->crtc, crtc);
 }
 
 void
@@ -51,7 +51,7 @@ meta_output_unassign_crtc (MetaOutput *output)
 {
   MetaOutputPrivate *priv = meta_output_get_instance_private (output);
 
-  priv->crtc = NULL;
+  g_clear_object (&priv->crtc);
 }
 
 MetaCrtc *
@@ -62,6 +62,17 @@ meta_output_get_assigned_crtc (MetaOutput *output)
   return priv->crtc;
 }
 
+static void
+meta_output_dispose (GObject *object)
+{
+  MetaOutput *output = META_OUTPUT (object);
+  MetaOutputPrivate *priv = meta_output_get_instance_private (output);
+
+  g_clear_object (&priv->crtc);
+
+  G_OBJECT_CLASS (meta_output_parent_class)->dispose (object);
+}
+
 static void
 meta_output_finalize (GObject *object)
 {
@@ -91,5 +102,6 @@ meta_output_class_init (MetaOutputClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
+  object_class->dispose = meta_output_dispose;
   object_class->finalize = meta_output_finalize;
 }