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[mutter] monitor-manager: Make tiled Xrandr monitors based on monitors

commit 78799e58d2ac6fb7756470347d4703a304d1763b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Dec 13 18:58:22 2016 +0800

    monitor-manager: Make tiled Xrandr monitors based on monitors
    
    Don't deal with adding/removing tiled Xrandr monitors in the generic
    backend, but leave it to the Xrandr backend. The tiled monitor will
    itself notify the backend when such a monitor is added and removed.
    
    Tiled Xrandr monitors are now based no MetaMonitor instead of
    MetaLogicalMonitor. This means that mirrored tiled monitors will now be
    represented correctly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-logical-monitor.h            |    1 -
 src/backends/meta-monitor-manager-private.h    |   13 ++-
 src/backends/meta-monitor-manager.c            |   67 +++------
 src/backends/meta-monitor.c                    |   34 +++++
 src/backends/meta-monitor.h                    |    4 +
 src/backends/x11/meta-monitor-manager-xrandr.c |  174 ++++++++++++++++++-----
 6 files changed, 205 insertions(+), 88 deletions(-)
---
diff --git a/src/backends/meta-logical-monitor.h b/src/backends/meta-logical-monitor.h
index 543f35b..a6a664d 100644
--- a/src/backends/meta-logical-monitor.h
+++ b/src/backends/meta-logical-monitor.h
@@ -55,7 +55,6 @@ struct _MetaLogicalMonitor
   */
   glong winsys_id;
 
-  int monitor_winsys_xid;
   int n_outputs;
   MetaOutput *outputs[META_MAX_OUTPUTS_PER_MONITOR];
 
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index e27107b..bc902bc 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -319,11 +319,11 @@ struct _MetaMonitorManagerClass
                           unsigned short     *,
                           unsigned short     *);
 
-  void (*add_monitor) (MetaMonitorManager *,
-                       MetaLogicalMonitor *);
+  void (*tiled_monitor_added) (MetaMonitorManager *,
+                               MetaMonitor        *);
 
-  void (*delete_monitor) (MetaMonitorManager *,
-                          int monitor_winsys_xid);
+  void (*tiled_monitor_removed) (MetaMonitorManager *,
+                                 MetaMonitor        *);
 
 };
 
@@ -394,6 +394,11 @@ gboolean           meta_monitor_manager_get_monitor_matrix (MetaMonitorManager *
                                                             MetaOutput         *output,
                                                             gfloat              matrix[6]);
 
+void               meta_monitor_manager_tiled_monitor_added (MetaMonitorManager *manager,
+                                                             MetaMonitor        *monitor);
+void               meta_monitor_manager_tiled_monitor_removed (MetaMonitorManager *manager,
+                                                               MetaMonitor        *monitor);
+
 void meta_monitor_manager_clear_output (MetaOutput *output);
 void meta_monitor_manager_clear_mode (MetaCrtcMode *mode);
 void meta_monitor_manager_clear_crtc (MetaCrtc *crtc);
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 98dd7de..951cba1 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -122,7 +122,6 @@ derive_monitor_position (MetaMonitor *monitor,
 static void
 make_logical_config (MetaMonitorManager *manager)
 {
-  MetaMonitorManagerClass *manager_class = META_MONITOR_MANAGER_GET_CLASS (manager);
   GList *logical_monitors = NULL;
   GList *l;
   int monitor_number;
@@ -174,18 +173,6 @@ make_logical_config (MetaMonitorManager *manager)
 
   meta_monitor_manager_set_primary_logical_monitor (manager,
                                                     primary_logical_monitor);
-
-  if (manager_class->add_monitor)
-    {
-      GList *l;
-
-      for (l = logical_monitors; l; l = l->next)
-        {
-          MetaLogicalMonitor *logical_monitor = l->data;
-
-          manager_class->add_monitor (manager, logical_monitor);
-        }
-    }
 }
 
 static void
@@ -1413,6 +1400,28 @@ rebuild_monitors (MetaMonitorManager *manager)
 }
 
 void
+meta_monitor_manager_tiled_monitor_added (MetaMonitorManager *manager,
+                                          MetaMonitor        *monitor)
+{
+  MetaMonitorManagerClass *manager_class =
+    META_MONITOR_MANAGER_GET_CLASS (manager);
+
+  if (manager_class->tiled_monitor_added)
+    manager_class->tiled_monitor_added (manager, monitor);
+}
+
+void
+meta_monitor_manager_tiled_monitor_removed (MetaMonitorManager *manager,
+                                            MetaMonitor        *monitor)
+{
+  MetaMonitorManagerClass *manager_class =
+    META_MONITOR_MANAGER_GET_CLASS (manager);
+
+  if (manager_class->tiled_monitor_removed)
+    manager_class->tiled_monitor_removed (manager, monitor);
+}
+
+void
 meta_monitor_manager_read_current_config (MetaMonitorManager *manager)
 {
   MetaOutput *old_outputs;
@@ -1444,9 +1453,7 @@ void
 meta_monitor_manager_rebuild_derived (MetaMonitorManager *manager)
 {
   MetaBackend *backend = meta_get_backend ();
-  MetaMonitorManagerClass *manager_class = META_MONITOR_MANAGER_GET_CLASS (manager);
   GList *old_logical_monitors;
-  GList *old_l;
 
   if (manager->in_init)
     return;
@@ -1455,36 +1462,6 @@ meta_monitor_manager_rebuild_derived (MetaMonitorManager *manager)
 
   make_logical_config (manager);
 
-  if (manager_class->delete_monitor)
-    {
-      for (old_l = old_logical_monitors; old_l; old_l = old_l->next)
-        {
-          MetaLogicalMonitor *old_logical_monitor = old_l->data;
-          int old_monitor_winsys_xid;
-          gboolean delete_mon;
-          GList *new_l;
-
-          delete_mon = TRUE;
-          old_monitor_winsys_xid = old_logical_monitor->monitor_winsys_xid;
-
-          for (new_l = manager->logical_monitors; new_l; new_l = new_l->next)
-            {
-              MetaLogicalMonitor *new_logical_monitor = new_l->data;
-              int new_monitor_winsys_xid;
-
-              new_monitor_winsys_xid = new_logical_monitor->monitor_winsys_xid;
-
-              if (new_monitor_winsys_xid == old_monitor_winsys_xid)
-                {
-                  delete_mon = FALSE;
-                  break;
-                }
-            }
-          if (delete_mon)
-            manager_class->delete_monitor (manager, old_monitor_winsys_xid);
-        }
-    }
-
   /* Tell the backend about that the monitors changed before emitting the
    * signal, so that the backend can prepare itself before all the signal
    * consumers.
diff --git a/src/backends/meta-monitor.c b/src/backends/meta-monitor.c
index 177dc7c..32c0fcf 100644
--- a/src/backends/meta-monitor.c
+++ b/src/backends/meta-monitor.c
@@ -23,6 +23,7 @@
 
 #include "backends/meta-monitor.h"
 
+#include "backends/meta-backend-private.h"
 #include "backends/meta-monitor-manager-private.h"
 
 typedef struct _MetaMonitorPrivate
@@ -115,6 +116,15 @@ meta_monitor_get_physical_dimensions (MetaMonitor *monitor,
   *height_mm = output->height_mm;
 }
 
+const char *
+meta_monitor_get_product (MetaMonitor *monitor)
+{
+  MetaOutput *output;
+
+  output = meta_monitor_get_main_output (monitor);
+  return output->product;
+}
+
 static void
 meta_monitor_finalize (GObject *object)
 {
@@ -188,6 +198,12 @@ meta_monitor_normal_class_init (MetaMonitorNormalClass *klass)
   monitor_class->get_dimensions = meta_monitor_normal_get_dimensions;
 }
 
+uint32_t
+meta_monitor_tiled_get_tile_group_id (MetaMonitorTiled *monitor_tiled)
+{
+  return monitor_tiled->tile_group_id;
+}
+
 static void
 add_tiled_monitor_outputs (MetaMonitorManager *monitor_manager,
                            MetaMonitorTiled   *monitor_tiled)
@@ -224,6 +240,9 @@ meta_monitor_tiled_new (MetaMonitorManager *monitor_manager,
   add_tiled_monitor_outputs (monitor_manager, monitor_tiled);
   monitor_tiled->main_output = output;
 
+  meta_monitor_manager_tiled_monitor_added (monitor_manager,
+                                            META_MONITOR (monitor_tiled));
+
   return monitor_tiled;
 }
 
@@ -264,6 +283,18 @@ meta_monitor_tiled_get_dimensions (MetaMonitor   *monitor,
 }
 
 static void
+meta_monitor_tiled_finalize (GObject *object)
+{
+  MetaMonitorTiled *monitor_tiled = META_MONITOR_TILED (object);
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+
+  meta_monitor_manager_tiled_monitor_removed (monitor_manager,
+                                              META_MONITOR (monitor_tiled));
+}
+
+static void
 meta_monitor_tiled_init (MetaMonitorTiled *monitor)
 {
 }
@@ -271,8 +302,11 @@ meta_monitor_tiled_init (MetaMonitorTiled *monitor)
 static void
 meta_monitor_tiled_class_init (MetaMonitorTiledClass *klass)
 {
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
   MetaMonitorClass *monitor_class = META_MONITOR_CLASS (klass);
 
+  object_class->finalize = meta_monitor_tiled_finalize;
+
   monitor_class->get_main_output = meta_monitor_tiled_get_main_output;
   monitor_class->get_dimensions = meta_monitor_tiled_get_dimensions;
 }
diff --git a/src/backends/meta-monitor.h b/src/backends/meta-monitor.h
index d19c75e..50d5105 100644
--- a/src/backends/meta-monitor.h
+++ b/src/backends/meta-monitor.h
@@ -70,4 +70,8 @@ void meta_monitor_get_physical_dimensions (MetaMonitor *monitor,
                                            int         *width_mm,
                                            int         *height_mm);
 
+const char * meta_monitor_get_product (MetaMonitor *monitor);
+
+uint32_t meta_monitor_tiled_get_tile_group_id (MetaMonitorTiled *monitor_tiled);
+
 #endif /* META_MONITOR_H */
diff --git a/src/backends/x11/meta-monitor-manager-xrandr.c b/src/backends/x11/meta-monitor-manager-xrandr.c
index ec4ccd5..d77661a 100644
--- a/src/backends/x11/meta-monitor-manager-xrandr.c
+++ b/src/backends/x11/meta-monitor-manager-xrandr.c
@@ -60,6 +60,10 @@ struct _MetaMonitorManagerXrandr
   int rr_event_base;
   int rr_error_base;
   gboolean has_randr15;
+
+#ifdef HAVE_XRANDR15
+  GHashTable *tiled_monitor_atoms;
+#endif /* HAVE_XRANDR15 */
 };
 
 struct _MetaMonitorManagerXrandrClass
@@ -69,6 +73,15 @@ struct _MetaMonitorManagerXrandrClass
 
 G_DEFINE_TYPE (MetaMonitorManagerXrandr, meta_monitor_manager_xrandr, META_TYPE_MONITOR_MANAGER);
 
+#ifdef HAVE_XRANDR15
+typedef struct _MetaMonitorXrandrData
+{
+  Atom xrandr_name;
+} MetaMonitorXrandrData;
+
+GQuark quark_meta_monitor_xrandr_data;
+#endif /* HAVE_RANDR15 */
+
 static MetaMonitorTransform
 meta_monitor_transform_from_xrandr (Rotation rotation)
 {
@@ -1332,61 +1345,138 @@ meta_monitor_manager_xrandr_set_crtc_gamma (MetaMonitorManager *manager,
 }
 
 #ifdef HAVE_XRANDR15
+static MetaMonitorXrandrData *
+meta_monitor_xrandr_data_from_monitor (MetaMonitor *monitor)
+{
+  MetaMonitorXrandrData *monitor_xrandr_data;
+
+  monitor_xrandr_data = g_object_get_qdata (G_OBJECT (monitor),
+                                            quark_meta_monitor_xrandr_data);
+  if (monitor_xrandr_data)
+    return monitor_xrandr_data;
+
+  monitor_xrandr_data = g_new0 (MetaMonitorXrandrData, 1);
+  g_object_set_qdata_full (G_OBJECT (monitor),
+                           quark_meta_monitor_xrandr_data,
+                           monitor_xrandr_data,
+                           g_free);
+
+  return monitor_xrandr_data;
+}
+
 static void
-meta_monitor_manager_xrandr_add_monitor (MetaMonitorManager *manager,
-                                         MetaLogicalMonitor *logical_monitor)
+meta_monitor_manager_xrandr_increase_monitor_count (MetaMonitorManagerXrandr *manager_xrandr,
+                                                    Atom                      name_atom)
+{
+  int count;
+
+  count =
+    GPOINTER_TO_INT (g_hash_table_lookup (manager_xrandr->tiled_monitor_atoms,
+                                          GSIZE_TO_POINTER (name_atom)));
+
+  count++;
+  g_hash_table_insert (manager_xrandr->tiled_monitor_atoms,
+                       GSIZE_TO_POINTER (name_atom),
+                       GINT_TO_POINTER (count));
+}
+
+static int
+meta_monitor_manager_xrandr_decrease_monitor_count (MetaMonitorManagerXrandr *manager_xrandr,
+                                                    Atom                      name_atom)
+{
+  int count;
+
+  count =
+    GPOINTER_TO_SIZE (g_hash_table_lookup (manager_xrandr->tiled_monitor_atoms,
+                                           GSIZE_TO_POINTER (name_atom)));
+  g_assert (count > 0);
+
+  count--;
+  g_hash_table_insert (manager_xrandr->tiled_monitor_atoms,
+                       GSIZE_TO_POINTER (name_atom),
+                       GINT_TO_POINTER (count));
+
+  return count;
+}
+
+static void
+meta_monitor_manager_xrandr_tiled_monitor_added (MetaMonitorManager *manager,
+                                                 MetaMonitor        *monitor)
 {
   MetaMonitorManagerXrandr *manager_xrandr = META_MONITOR_MANAGER_XRANDR (manager);
-  XRRMonitorInfo *m;
-  int o;
-  Atom name;
-  char name_buf[40];
+  MetaMonitorTiled *monitor_tiled = META_MONITOR_TILED (monitor);
+  const char *product;
+  char *name;
+  uint32_t tile_group_id;
+  MetaMonitorXrandrData *monitor_xrandr_data;
+  Atom name_atom;
+  XRRMonitorInfo *xrandr_monitor_info;
+  GList *outputs;
+  GList *l;
+  int i;
 
   if (manager_xrandr->has_randr15 == FALSE)
     return;
 
-  if (logical_monitor->n_outputs <= 1)
-    return;
+  product = meta_monitor_get_product (monitor);
+  tile_group_id = meta_monitor_tiled_get_tile_group_id (monitor_tiled);
 
-  if (logical_monitor->outputs[0]->product)
-    snprintf (name_buf, 40, "%s-%d",
-              logical_monitor->outputs[0]->product,
-              logical_monitor->outputs[0]->tile_info.group_id);
+  if (product)
+    name = g_strdup_printf ("%s-%d", product, tile_group_id);
   else
-    snprintf (name_buf, 40, "Tiled-%d",
-              logical_monitor->outputs[0]->tile_info.group_id);
-
-  name = XInternAtom (manager_xrandr->xdisplay, name_buf, False);
-  logical_monitor->monitor_winsys_xid = name;
-  m = XRRAllocateMonitor (manager_xrandr->xdisplay,
-                          logical_monitor->n_outputs);
-  if (!m)
-    return;
-  m->name = name;
-  m->primary = logical_monitor->is_primary;
-  m->automatic = True;
+    name = g_strdup_printf ("Tiled-%d", tile_group_id);
+
+  name_atom = XInternAtom (manager_xrandr->xdisplay, name, False);
+  g_free (name);
+
+  monitor_xrandr_data = meta_monitor_xrandr_data_from_monitor (monitor);
+  monitor_xrandr_data->xrandr_name = name_atom;
+
+  meta_monitor_manager_xrandr_increase_monitor_count (manager_xrandr,
+                                                      name_atom);
+
+  outputs = meta_monitor_get_outputs (monitor);
+  xrandr_monitor_info = XRRAllocateMonitor (manager_xrandr->xdisplay,
+                                            g_list_length (outputs));
+  xrandr_monitor_info->name = name_atom;
+  xrandr_monitor_info->primary = meta_monitor_is_primary (monitor);
+  xrandr_monitor_info->automatic = True;
+  for (l = outputs, i = 0; l; l = l->next, i++)
+    {
+      MetaOutput *output = l->data;
+
+      xrandr_monitor_info->outputs[i] = output->winsys_id;
+    }
 
-  for (o = 0; o < logical_monitor->n_outputs; o++) {
-    MetaOutput *output = logical_monitor->outputs[o];
-    m->outputs[o] = output->winsys_id;
-  }
   XRRSetMonitor (manager_xrandr->xdisplay,
                  DefaultRootWindow (manager_xrandr->xdisplay),
-                 m);
-  XRRFreeMonitors (m);
+                 xrandr_monitor_info);
+  XRRFreeMonitors (xrandr_monitor_info);
 }
 
 static void
-meta_monitor_manager_xrandr_delete_monitor (MetaMonitorManager *manager,
-                                            int monitor_winsys_xid)
+meta_monitor_manager_xrandr_tiled_monitor_removed (MetaMonitorManager *manager,
+                                                   MetaMonitor        *monitor)
 {
   MetaMonitorManagerXrandr *manager_xrandr = META_MONITOR_MANAGER_XRANDR (manager);
+  MetaMonitorXrandrData *monitor_xrandr_data;
+  Atom monitor_name;
+
+  int monitor_count;
 
   if (manager_xrandr->has_randr15 == FALSE)
     return;
-  XRRDeleteMonitor (manager_xrandr->xdisplay,
-                    DefaultRootWindow (manager_xrandr->xdisplay),
-                    monitor_winsys_xid);
+
+  monitor_xrandr_data = meta_monitor_xrandr_data_from_monitor (monitor);
+  monitor_name = monitor_xrandr_data->xrandr_name;
+  monitor_count =
+    meta_monitor_manager_xrandr_decrease_monitor_count (manager_xrandr,
+                                                        monitor_name);
+
+  if (monitor_count == 0)
+    XRRDeleteMonitor (manager_xrandr->xdisplay,
+                      DefaultRootWindow (manager_xrandr->xdisplay),
+                      monitor_name);
 }
 
 static void
@@ -1448,7 +1538,10 @@ meta_monitor_manager_xrandr_init (MetaMonitorManagerXrandr *manager_xrandr)
       if (major_version > 1 ||
           (major_version == 1 &&
            minor_version >= 5))
-        manager_xrandr->has_randr15 = TRUE;
+        {
+          manager_xrandr->has_randr15 = TRUE;
+          manager_xrandr->tiled_monitor_atoms = g_hash_table_new (NULL, NULL);
+        }
       meta_monitor_manager_xrandr_init_monitors (manager_xrandr);
 #endif
     }
@@ -1463,6 +1556,8 @@ meta_monitor_manager_xrandr_finalize (GObject *object)
     XRRFreeScreenResources (manager_xrandr->resources);
   manager_xrandr->resources = NULL;
 
+  g_hash_table_destroy (manager_xrandr->tiled_monitor_atoms);
+
   G_OBJECT_CLASS (meta_monitor_manager_xrandr_parent_class)->finalize (object);
 }
 
@@ -1482,9 +1577,12 @@ meta_monitor_manager_xrandr_class_init (MetaMonitorManagerXrandrClass *klass)
   manager_class->get_crtc_gamma = meta_monitor_manager_xrandr_get_crtc_gamma;
   manager_class->set_crtc_gamma = meta_monitor_manager_xrandr_set_crtc_gamma;
 #ifdef HAVE_XRANDR15
-  manager_class->add_monitor = meta_monitor_manager_xrandr_add_monitor;
-  manager_class->delete_monitor = meta_monitor_manager_xrandr_delete_monitor;
+  manager_class->tiled_monitor_added = meta_monitor_manager_xrandr_tiled_monitor_added;
+  manager_class->tiled_monitor_removed = meta_monitor_manager_xrandr_tiled_monitor_removed;
 #endif
+
+  quark_meta_monitor_xrandr_data =
+    g_quark_from_static_string ("-meta-monitor-xrandr-data");
 }
 
 gboolean
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