Remove option to turn compositing off

This patch removes the ability to disable compositing in mutter.  As
clutter compositing was the reason for the fork from metacity, turning
compositing off does not make sense.

https://bugzilla.gnome.org/show_bug.cgi?id=626875

src/core/display.c

@@ -387,26 +387,6 @@ enable_compositor (MetaDisplay *display,
     }
 }
 
-static void
-disable_compositor (MetaDisplay *display)
-{
-  GSList *list;
-  
-  if (!display->compositor)
-    return;
-  
-  for (list = display->screens; list != NULL; list = list->next)
-    {
-      MetaScreen *screen = list->data;
-      
-      meta_compositor_unmanage_screen (screen->display->compositor,
-				       screen);
-    }
-  
-  meta_compositor_destroy (display->compositor);
-  display->compositor = NULL;
-}
-
 static void
 meta_display_init (MetaDisplay *disp)
 {
@@ -839,7 +819,6 @@ meta_display_open (void)
   /* We don't composite the windows here because they will be composited 
      faster with the call to meta_screen_manage_all_windows further down 
      the code */
-  if (1) /* meta_prefs_get_compositing_manager ()) FIXME */
   enable_compositor (the_display, FALSE);
    
   meta_display_grab (the_display);
@@ -5188,15 +5167,6 @@ prefs_changed_callback (MetaPreference pref,
     {
       meta_bell_set_audible (display, meta_prefs_bell_is_audible ());
     }
-  else if (pref == META_PREF_COMPOSITING_MANAGER)
-    {
-      gboolean cm = meta_prefs_get_compositing_manager ();
-
-      if (cm)
-        enable_compositor (display, TRUE);
-      else
-	disable_compositor (display);
-    }
   else if (pref == META_PREF_ATTACH_MODAL_DIALOGS)
     {
       MetaDisplay *display = data;

src/core/main.c

@@ -296,18 +296,6 @@ meta_parse_options (int *argc, char ***argv,
       N_("Make X calls synchronous"),
       NULL
     },
-    {
-      "composite", 'c', COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
-      &my_args.composite,
-      N_("Turn compositing on"),
-      NULL
-    },
-    {
-      "no-composite", 0, COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
-      &my_args.no_composite,
-      N_("Turn compositing off"),
-      NULL
-    },
     {
       "no-force-fullscreen", 0, COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
       &my_args.no_force_fullscreen,
@@ -705,9 +693,6 @@ main (int argc, char **argv)
   g_free (meta_args.display_name);
   g_free (meta_args.client_id);
 
-  if (meta_args.composite || meta_args.no_composite)
-    meta_prefs_set_compositing_manager (meta_args.composite);
-
   if (meta_args.no_force_fullscreen)
     meta_prefs_set_force_fullscreen (FALSE);
 

src/core/prefs.c

@@ -50,7 +50,6 @@
  */
 #define KEY_TITLEBAR_FONT "/apps/metacity/general/titlebar_font"
 #define KEY_NUM_WORKSPACES "/apps/metacity/general/num_workspaces"
-#define KEY_COMPOSITOR "/apps/metacity/general/compositing_manager"
 #define KEY_GNOME_ACCESSIBILITY "/desktop/gnome/interface/accessibility"
 
 #define KEY_COMMAND_DIRECTORY "/apps/metacity/keybinding_commands"
@@ -102,7 +101,6 @@ static gboolean gnome_accessibility = FALSE;
 static gboolean gnome_animations = TRUE;
 static char *cursor_theme = NULL;
 static int   cursor_size = 24;
-static gboolean compositing_manager = FALSE;
 static gboolean resize_with_right_button = FALSE;
 static gboolean edge_tiling = FALSE;
 static gboolean force_fullscreen = TRUE;
@@ -413,11 +411,6 @@ static MetaBoolPreference preferences_bool[] =
       &gnome_animations,
       TRUE,
     },
-    { "/apps/metacity/general/compositing_manager",
-      META_PREF_COMPOSITING_MANAGER,
-      &compositing_manager,
-      FALSE,
-    },
     { "/apps/metacity/general/resize_with_right_button",
       META_PREF_RESIZE_WITH_RIGHT_BUTTON,
       &resize_with_right_button,
@@ -2004,9 +1997,6 @@ meta_preference_to_string (MetaPreference pref)
     case META_PREF_CURSOR_SIZE:
       return "CURSOR_SIZE";
 
-    case META_PREF_COMPOSITING_MANAGER:
-      return "COMPOSITING_MANAGER";
-
     case META_PREF_RESIZE_WITH_RIGHT_BUTTON:
       return "RESIZE_WITH_RIGHT_BUTTON";
 
@@ -2992,12 +2982,6 @@ meta_prefs_get_window_binding (const char          *name,
   g_assert_not_reached ();
 }
 
-gboolean
-meta_prefs_get_compositing_manager (void)
-{
-  return compositing_manager;
-}
-
 guint
 meta_prefs_get_mouse_button_resize (void)
 {
@@ -3016,28 +3000,6 @@ meta_prefs_get_force_fullscreen (void)
   return force_fullscreen;
 }
 
-void
-meta_prefs_set_compositing_manager (gboolean whether)
-{
-#ifdef HAVE_GCONF
-  GError *err = NULL;
-
-  gconf_client_set_bool (default_client,
-                         KEY_COMPOSITOR,
-                         whether,
-                         &err);
-
-  if (err)
-    {
-      meta_warning (_("Error setting compositor status: %s\n"),
-                    err->message);
-      g_error_free (err);
-    }
-#else
-  compositing_manager = whether;
-#endif
-}
-
 /**
  * meta_prefs_get_clutter_plugins:
  *

src/include/prefs.h

@@ -58,7 +58,6 @@ typedef enum
   META_PREF_GNOME_ANIMATIONS,
   META_PREF_CURSOR_THEME,
   META_PREF_CURSOR_SIZE,
-  META_PREF_COMPOSITING_MANAGER,
   META_PREF_RESIZE_WITH_RIGHT_BUTTON,
   META_PREF_EDGE_TILING,
   META_PREF_FORCE_FULLSCREEN,