[mutter] backends: Start on an initial MetaBackend object

[Jasper St. Pierre <jstpierre src gnome org>]

commit 00ea9bf14bd98edd902e33cd8e6af1688bee3131
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Apr 21 19:03:22 2014 -0400

    backends: Start on an initial MetaBackend object
    
    This isn't great so far -- all we did is put the idle monitors here
    instead. We'll soon have separate backend subclasses for the two
    backends.

 src/Makefile.am                            |    1 +
 src/backends/meta-backend-private.h        |   53 +++++++++++++
 src/backends/meta-backend.c                |  115 ++++++++++++++++++++++++++++
 src/backends/meta-backend.h                |   16 ++++
 src/backends/meta-idle-monitor.c           |   65 +--------------
 src/backends/x11/meta-idle-monitor-xsync.h |    2 -
 src/core/events.c                          |    6 +-
 7 files changed, 195 insertions(+), 63 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 09721c0..816eef6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -49,6 +49,7 @@ wayland_protocols = \
 libmutter_la_SOURCES =                         \
        backends/meta-backend.c                 \
        backends/meta-backend.h                 \
+       backends/meta-backend-private.h         \
        backends/meta-cursor.c                  \
        backends/meta-cursor.h                  \
        backends/meta-cursor-private.h          \
diff --git a/src/backends/meta-backend-private.h b/src/backends/meta-backend-private.h
new file mode 100644
index 0000000..1f54b86
--- /dev/null
+++ b/src/backends/meta-backend-private.h
@@ -0,0 +1,53 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/*
+ * Copyright (C) 2014 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Written by:
+ *     Jasper St. Pierre <jstpierre mecheye net>
+ */
+
+
+#ifndef META_BACKEND_PRIVATE_H
+#define META_BACKEND_PRIVATE_H
+
+#include <glib-object.h>
+
+#include "meta-backend.h"
+
+#define META_TYPE_BACKEND             (meta_backend_get_type ())
+#define META_BACKEND(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_BACKEND, MetaBackend))
+#define META_BACKEND_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass),  META_TYPE_BACKEND, 
MetaBackendClass))
+#define META_IS_BACKEND(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_BACKEND))
+#define META_IS_BACKEND_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass),  META_TYPE_BACKEND))
+#define META_BACKEND_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj),  META_TYPE_BACKEND, 
MetaBackendClass))
+
+struct _MetaBackend
+{
+  GObject parent;
+
+  MetaIdleMonitor *device_monitors[256];
+  int device_id_max;
+};
+
+struct _MetaBackendClass
+{
+  GObjectClass parent_class;
+};
+
+#endif /* META_BACKEND_PRIVATE_H */
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index b8a6dc1..967d983 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -25,6 +25,7 @@
 #include "config.h"
 
 #include "meta-backend.h"
+#include "meta-backend-private.h"
 #include <meta/main.h>
 
 #include <gdk/gdkx.h>
@@ -34,6 +35,118 @@
 #include "backends/native/meta-weston-launch.h"
 #include <meta/util.h>
 
+#include "backends/x11/meta-idle-monitor-xsync.h"
+#include "backends/native/meta-idle-monitor-native.h"
+
+static MetaBackend *_backend;
+
+MetaBackend *
+meta_get_backend (void)
+{
+  return _backend;
+}
+
+G_DEFINE_TYPE (MetaBackend, meta_backend, G_TYPE_OBJECT);
+
+static void
+meta_backend_finalize (GObject *object)
+{
+  MetaBackend *backend = META_BACKEND (object);
+  int i;
+
+  for (i = 0; i <= backend->device_id_max; i++)
+    {
+      if (backend->device_monitors[i])
+        g_object_unref (backend->device_monitors[i]);
+    }
+
+  G_OBJECT_CLASS (meta_backend_parent_class)->finalize (object);
+}
+
+static void
+meta_backend_class_init (MetaBackendClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = meta_backend_finalize;
+}
+
+static void
+meta_backend_init (MetaBackend *backend)
+{
+  _backend = backend;
+}
+
+static GType
+get_idle_monitor_type (void)
+{
+#if defined(CLUTTER_WINDOWING_X11)
+  if (clutter_check_windowing_backend (CLUTTER_WINDOWING_X11))
+    return META_TYPE_IDLE_MONITOR_XSYNC;
+#endif
+
+  return META_TYPE_IDLE_MONITOR_NATIVE;
+}
+
+/* FIXME -- destroy device monitors at some point */
+G_GNUC_UNUSED static void
+destroy_device_monitor (MetaBackend *backend,
+                        int          device_id)
+{
+  g_clear_object (&backend->device_monitors[device_id]);
+  if (device_id == backend->device_id_max)
+    backend->device_id_max--;
+}
+
+MetaIdleMonitor *
+meta_backend_get_idle_monitor (MetaBackend *backend,
+                               int          device_id)
+{
+  g_return_val_if_fail (device_id >= 0 && device_id < 256, NULL);
+
+  if (!backend->device_monitors[device_id])
+    {
+      backend->device_monitors[device_id] = g_object_new (get_idle_monitor_type (),
+                                                          "device-id", device_id,
+                                                          NULL);
+      backend->device_id_max = MAX (backend->device_id_max, device_id);
+    }
+
+  return backend->device_monitors[device_id];
+}
+
+void
+meta_backend_x11_handle_alarm_notify (MetaBackend *backend,
+                                      XEvent      *xevent)
+{
+  int i;
+
+  for (i = 0; i <= backend->device_id_max; i++)
+    {
+      if (backend->device_monitors[i])
+        {
+          if (!META_IS_IDLE_MONITOR_XSYNC (backend->device_monitors[i]))
+            return;
+
+          meta_idle_monitor_xsync_handle_xevent (backend->device_monitors[i], 
(XSyncAlarmNotifyEvent*)xevent);
+        }
+    }
+}
+
+static GType
+get_backend_type (void)
+{
+  return META_TYPE_BACKEND;
+}
+
+static void
+meta_create_backend (void)
+{
+  /* The initializer above installs it in _backend so meta_get_backend
+   * is valid during initialization. */
+  g_object_new (get_backend_type (), NULL);
+}
+
 /* Mutter is responsible for pulling events off the X queue, so Clutter
  * doesn't need (and shouldn't) run its normal event source which polls
  * the X fd, but we do have to deal with dispatching events that accumulate
@@ -89,6 +202,8 @@ meta_clutter_init (void)
 {
   GSource *source;
 
+  meta_create_backend ();
+
   /* When running as an X11 compositor, we install our own event filter and
    * pass events to Clutter explicitly, so we need to prevent Clutter from
    * handling our events.
diff --git a/src/backends/meta-backend.h b/src/backends/meta-backend.h
index 03d8a56..0e718a3 100644
--- a/src/backends/meta-backend.h
+++ b/src/backends/meta-backend.h
@@ -27,6 +27,22 @@
 
 #include <glib-object.h>
 
+#include <X11/Xlib.h>
+#include <meta/meta-idle-monitor.h>
+
+typedef struct _MetaBackend        MetaBackend;
+typedef struct _MetaBackendClass   MetaBackendClass;
+
+GType meta_backend_get_type (void);
+
+MetaBackend * meta_get_backend (void);
+
+MetaIdleMonitor * meta_backend_get_idle_monitor (MetaBackend *backend,
+                                                 int          device_id);
+
+void meta_backend_x11_handle_alarm_notify (MetaBackend *backend,
+                                           XEvent      *event);
+
 void meta_clutter_init (void);
 
 gboolean meta_activate_vt (int vt, GError **error);
diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
index 5e18f1b..adc96ab 100644
--- a/src/backends/meta-idle-monitor.c
+++ b/src/backends/meta-idle-monitor.c
@@ -38,8 +38,7 @@
 #include <meta/meta-idle-monitor.h>
 #include "meta-idle-monitor-private.h"
 #include "meta-idle-monitor-dbus.h"
-#include "backends/x11/meta-idle-monitor-xsync.h"
-#include "backends/native/meta-idle-monitor-native.h"
+#include "meta-backend.h"
 
 G_STATIC_ASSERT(sizeof(unsigned long) == sizeof(gpointer));
 
@@ -54,9 +53,6 @@ static GParamSpec *obj_props[PROP_LAST];
 
 G_DEFINE_TYPE (MetaIdleMonitor, meta_idle_monitor, G_TYPE_OBJECT)
 
-static MetaIdleMonitor *device_monitors[256];
-static int              device_id_max;
-
 void
 _meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch)
 {
@@ -160,38 +156,6 @@ meta_idle_monitor_init (MetaIdleMonitor *monitor)
 {
 }
 
-static GType
-get_idle_monitor_type (void)
-{
-#if defined(CLUTTER_WINDOWING_X11)
-  if (clutter_check_windowing_backend (CLUTTER_WINDOWING_X11))
-    return META_TYPE_IDLE_MONITOR_XSYNC;
-#endif
-
-  return META_TYPE_IDLE_MONITOR_NATIVE;
-}
-
-static void
-ensure_device_monitor (int device_id)
-{
-  if (device_monitors[device_id])
-    return;
-
-  device_monitors[device_id] = g_object_new (get_idle_monitor_type (),
-                                             "device-id", device_id,
-                                             NULL);
-  device_id_max = MAX (device_id_max, device_id);
-}
-
-/* FIXME -- destroy device monitors at some point */
-G_GNUC_UNUSED static void
-destroy_device_monitor (int device_id)
-{
-  g_clear_object (&device_monitors[device_id]);
-  if (device_id == device_id_max)
-    device_id_max--;
-}
-
 /**
  * meta_idle_monitor_get_core:
  *
@@ -202,8 +166,8 @@ destroy_device_monitor (int device_id)
 MetaIdleMonitor *
 meta_idle_monitor_get_core (void)
 {
-  ensure_device_monitor (0);
-  return device_monitors[0];
+  MetaBackend *backend = meta_get_backend ();
+  return meta_backend_get_idle_monitor (backend, 0);
 }
 
 /**
@@ -217,10 +181,8 @@ meta_idle_monitor_get_core (void)
 MetaIdleMonitor *
 meta_idle_monitor_get_for_device (int device_id)
 {
-  g_return_val_if_fail (device_id > 0 && device_id < 256, NULL);
-
-  ensure_device_monitor (device_id);
-  return device_monitors[device_id];
+  MetaBackend *backend = meta_get_backend ();
+  return meta_backend_get_idle_monitor (backend, device_id);
 }
 
 static MetaIdleMonitorWatch *
@@ -354,20 +316,3 @@ meta_idle_monitor_get_idletime (MetaIdleMonitor *monitor)
 {
   return META_IDLE_MONITOR_GET_CLASS (monitor)->get_idletime (monitor);
 }
-
-void
-meta_idle_monitor_xsync_handle_xevent_all (XEvent *xevent)
-{
-  int i;
-
-  for (i = 0; i <= device_id_max; i++)
-    {
-      if (device_monitors[i])
-        {
-          if (!META_IS_IDLE_MONITOR_XSYNC (device_monitors[i]))
-            return;
-
-          meta_idle_monitor_xsync_handle_xevent (device_monitors[i], (XSyncAlarmNotifyEvent*)xevent);
-        }
-    }
-}
diff --git a/src/backends/x11/meta-idle-monitor-xsync.h b/src/backends/x11/meta-idle-monitor-xsync.h
index f8e88f0..e349cfa 100644
--- a/src/backends/x11/meta-idle-monitor-xsync.h
+++ b/src/backends/x11/meta-idle-monitor-xsync.h
@@ -44,6 +44,4 @@ GType meta_idle_monitor_xsync_get_type (void);
 void meta_idle_monitor_xsync_handle_xevent (MetaIdleMonitor       *monitor,
                                             XSyncAlarmNotifyEvent *xevent);
 
-void meta_idle_monitor_xsync_handle_xevent_all (XEvent *xevent);
-
 #endif /* META_IDLE_MONITOR_XSYNC_H */
diff --git a/src/core/events.c b/src/core/events.c
index 90d346a..34c84a0 100644
--- a/src/core/events.c
+++ b/src/core/events.c
@@ -34,6 +34,7 @@
 #include "window-private.h"
 #include "bell.h"
 #include "workspace-private.h"
+#include "backends/meta-backend.h"
 #include "backends/x11/meta-idle-monitor-xsync.h"
 #include "backends/native/meta-idle-monitor-native.h"
 
@@ -1264,7 +1265,10 @@ handle_other_xevent (MetaDisplay *display,
           bypass_gtk = TRUE; /* GTK doesn't want to see this really */
         }
       else
-        meta_idle_monitor_xsync_handle_xevent_all (event);
+        {
+          MetaBackend *backend = meta_get_backend ();
+          meta_backend_x11_handle_alarm_notify (backend, event);
+        }
 
       goto out;
     }