[gnome-flashback/wip/randr-1.5: 7/7] display-config: add support for setting randr 1.5 monitors

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 5a1b2a1e578c02bce84a777686f44d6952f6a389
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Jun 4 02:54:48 2015 +0300

    display-config: add support for setting randr 1.5 monitors
    
    This interface allows us to propogate back the constructed
    monitors to randr using the randr 1.5 protocol. Apps should pick
    it up from there.
    
    Based on:
    https://git.gnome.org/browse/mutter/commit/?id=9f65edd4f547f056ebaf1e5a144097390147f042

 .../libdisplay-config/flashback-monitor-manager.c  |  115 ++++++++++++++++++++
 1 files changed, 115 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c 
b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
index 35fb5ed..31cd0cd 100644
--- a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
+++ b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
@@ -72,6 +72,96 @@ enum
 
 static GParamSpec *object_properties[N_PROPERTIES] = { NULL, };
 
+static void
+add_monitor (FlashbackMonitorManager *manager,
+             MetaMonitorInfo         *monitor)
+{
+#ifdef HAVE_XRANDR15
+  XRRMonitorInfo *m;
+  int o;
+  Atom name;
+  char name_buf[40];
+
+  if (manager->priv->has_randr15 == FALSE)
+    return;
+
+  if (monitor->n_outputs <= 1)
+    return;
+
+  if (monitor->outputs[0]->product)
+    snprintf (name_buf, 40, "%s-%d", monitor->outputs[0]->product, monitor->outputs[0]->tile_info.group_id);
+  else
+    snprintf (name_buf, 40, "Tiled-%d", monitor->outputs[0]->tile_info.group_id);
+
+  name = XInternAtom (manager->priv->xdisplay, name_buf, False);
+  monitor->monitor_winsys_xid = name;
+  m = XRRAllocateMonitor (manager->priv->xdisplay, monitor->n_outputs);
+  if (!m)
+    return;
+
+  m->name = name;
+  m->primary = monitor->is_primary;
+  m->automatic = True;
+
+  for (o = 0; o < monitor->n_outputs; o++)
+    {
+      MetaOutput *output = monitor->outputs[o];
+      m->outputs[o] = output->winsys_id;
+    }
+
+  XRRSetMonitor (manager->priv->xdisplay,
+                 DefaultRootWindow (manager->priv->xdisplay),
+                 m);
+
+  XRRFreeMonitors (m);
+#endif
+}
+
+static void
+remove_monitor (FlashbackMonitorManager *manager,
+                int                      monitor_winsys_xid)
+{
+#ifdef HAVE_XRANDR15
+  if (manager->priv->has_randr15 == FALSE)
+    return;
+
+  XRRDeleteMonitor (manager->priv->xdisplay,
+                    DefaultRootWindow (manager->priv->xdisplay),
+                    monitor_winsys_xid);
+#endif
+}
+
+static void
+init_monitors (FlashbackMonitorManager *manager)
+{
+#ifdef HAVE_XRANDR15
+  XRRMonitorInfo *m;
+  int n, i;
+
+  if (manager->priv->has_randr15 == FALSE)
+    return;
+
+  /* delete any tiled monitors setup, as mutter will want to recreate
+     things in its image */
+  m = XRRGetMonitors (manager->priv->xdisplay,
+                      DefaultRootWindow (manager->priv->xdisplay),
+                      FALSE, &n);
+
+  if (n == -1)
+    return;
+
+  for (i = 0; i < n; i++)
+    {
+      if (m[i].noutput > 1)
+        XRRDeleteMonitor (manager->priv->xdisplay,
+                          DefaultRootWindow (manager->priv->xdisplay),
+                          m[i].name);
+    }
+
+  XRRFreeMonitors (m);
+#endif
+}
+
 static GdkFilterReturn
 filter_func (GdkXEvent *xevent,
              GdkEvent  *event,
@@ -880,6 +970,9 @@ make_logical_config (FlashbackMonitorManager *manager)
 
   manager->n_monitor_infos = monitor_infos->len;
   manager->monitor_infos = (void*)g_array_free (monitor_infos, FALSE);
+
+  for (i = 0; i < manager->n_monitor_infos; i++)
+    add_monitor (manager, &manager->monitor_infos[i]);
 }
 
 static void
@@ -1392,6 +1485,8 @@ flashback_monitor_manager_init (FlashbackMonitorManager *manager)
   if (major_version > 1 || (major_version == 1 && minor_version >= 5))
     priv->has_randr15 = TRUE;
 #endif
+
+  init_monitors (manager);
 }
 
 FlashbackMonitorManager *
@@ -1942,14 +2037,34 @@ void
 flashback_monitor_manager_rebuild_derived (FlashbackMonitorManager *manager)
 {
   MetaMonitorInfo *old_monitor_infos;
+  unsigned old_n_monitor_infos;
+  unsigned i, j;
 
   old_monitor_infos = manager->monitor_infos;
+  old_n_monitor_infos = manager->n_monitor_infos;
 
   if (manager->in_init)
     return;
 
   make_logical_config (manager);
 
+  for (i = 0; i < old_n_monitor_infos; i++)
+    {
+      gboolean delete_mon = TRUE;
+
+      for (j = 0; j < manager->n_monitor_infos; j++)
+        {
+          if (manager->monitor_infos[j].monitor_winsys_xid == old_monitor_infos[i].monitor_winsys_xid)
+            {
+              delete_mon = FALSE;
+              break;
+            }
+        }
+
+      if (delete_mon)
+        remove_monitor (manager, old_monitor_infos[i].monitor_winsys_xid);
+    }
+
   g_signal_emit_by_name (manager->priv->display_config, "monitors-changed");
 
   g_free (old_monitor_infos);