[mutter/bilelmoussaoui/x11-build-guards-2: 30/42] compositor: Guard X11 types

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 45c5e34bc786075b7a6b3fb2ecc89f65c8f3311d
Author: Bilal Elmoussaoui <belmouss redhat com>
Date:   Tue May 31 11:42:47 2022 +0200

    compositor: Guard X11 types
    
    This also moves meta_compositor_x11_redirect_windows to DisplayX11
    where it makes more sense as meta_display_x11_redirection_windows
    
    Related: https://gitlab.gnome.org/GNOME/mutter/-/issues/2272

 src/compositor/compositor-private.h  |  2 --
 src/compositor/compositor.c          | 38 +++++++++++++++++++++----------
 src/compositor/meta-compositor-x11.c |  2 +-
 src/core/display.c                   | 20 +++++++++++-----
 src/meta/meta-x11-display.h          |  2 ++
 src/x11/meta-x11-display.c           | 44 ++++++++++++++++++++++++++++++++++++
 6 files changed, 87 insertions(+), 21 deletions(-)
---
diff --git a/src/compositor/compositor-private.h b/src/compositor/compositor-private.h
index 4262f23cc7..66e0fd861e 100644
--- a/src/compositor/compositor-private.h
+++ b/src/compositor/compositor-private.h
@@ -66,8 +66,6 @@ MetaInhibitShortcutsDialog * meta_compositor_create_inhibit_shortcuts_dialog (Me
 
 void meta_compositor_locate_pointer (MetaCompositor *compositor);
 
-void meta_compositor_redirect_x11_windows (MetaCompositor *compositor);
-
 gboolean meta_compositor_is_unredirect_inhibited (MetaCompositor *compositor);
 
 MetaDisplay * meta_compositor_get_display (MetaCompositor *compositor);
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index f8ea427c3c..14ceeeb004 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -54,15 +54,9 @@
 
 #include "compositor/compositor-private.h"
 
-#include <X11/extensions/Xcomposite.h>
-
-#include "backends/x11/meta-backend-x11.h"
-#include "backends/x11/meta-event-x11.h"
-#include "backends/x11/meta-stage-x11.h"
 #include "clutter/clutter-mutter.h"
 #include "cogl/cogl.h"
 #include "compositor/meta-later-private.h"
-#include "compositor/meta-window-actor-x11.h"
 #include "compositor/meta-window-actor-private.h"
 #include "compositor/meta-window-group-private.h"
 #include "core/frame.h"
@@ -75,16 +69,27 @@
 #include "meta/meta-background-group.h"
 #include "meta/meta-context.h"
 #include "meta/meta-shadow-factory.h"
-#include "meta/meta-x11-errors.h"
 #include "meta/prefs.h"
 #include "meta/window.h"
-#include "x11/meta-x11-display-private.h"
 
 #ifdef HAVE_WAYLAND
 #include "compositor/meta-window-actor-wayland.h"
 #include "wayland/meta-wayland-private.h"
 #endif
 
+#ifdef HAVE_X11_CLIENT
+#include <X11/extensions/Xcomposite.h>
+
+#include "backends/x11/meta-backend-x11.h"
+#include "backends/x11/meta-event-x11.h"
+#include "backends/x11/meta-stage-x11.h"
+
+#include "compositor/meta-window-actor-x11.h"
+
+#include "meta/meta-x11-errors.h"
+#include "x11/meta-x11-display-private.h"
+#endif
+
 enum
 {
   PROP_0,
@@ -312,6 +317,7 @@ void
 meta_focus_stage_window (MetaDisplay *display,
                          guint32      timestamp)
 {
+#ifdef HAVE_X11_CLIENT
   ClutterStage *stage;
   Window window;
 
@@ -327,18 +333,19 @@ meta_focus_stage_window (MetaDisplay *display,
   meta_x11_display_set_input_focus_xwindow (display->x11_display,
                                             window,
                                             timestamp);
+#endif
 }
 
 gboolean
 meta_stage_is_focused (MetaDisplay *display)
 {
-  ClutterStage *stage;
-  Window window;
-
   if (meta_is_wayland_compositor ())
     return TRUE;
 
-  stage = CLUTTER_STAGE (meta_get_stage_for_display (display));
+#ifdef HAVE_X11_CLIENT
+  ClutterStage *stage = CLUTTER_STAGE (meta_get_stage_for_display (display));
+  Window window;
+
   if (!stage)
     return FALSE;
 
@@ -348,6 +355,9 @@ meta_stage_is_focused (MetaDisplay *display)
     return FALSE;
 
   return (display->x11_display->focus_xwindow == window);
+#else
+  return FALSE;
+#endif
 }
 
 void
@@ -498,9 +508,11 @@ meta_compositor_add_window (MetaCompositor    *compositor,
 
   switch (window->client_type)
     {
+#ifdef HAVE_X11_CLIENT
     case META_WINDOW_CLIENT_TYPE_X11:
       window_actor_type = META_TYPE_WINDOW_ACTOR_X11;
       break;
+#endif
 
 #ifdef HAVE_WAYLAND
     case META_WINDOW_CLIENT_TYPE_WAYLAND:
@@ -586,7 +598,9 @@ meta_compositor_window_shape_changed (MetaCompositor *compositor,
   if (!window_actor)
     return;
 
+#ifdef HAVE_X11_CLIENT
   meta_window_actor_x11_update_shape (META_WINDOW_ACTOR_X11 (window_actor));
+#endif
 }
 
 void
diff --git a/src/compositor/meta-compositor-x11.c b/src/compositor/meta-compositor-x11.c
index e7cb39abe5..6754a17125 100644
--- a/src/compositor/meta-compositor-x11.c
+++ b/src/compositor/meta-compositor-x11.c
@@ -199,7 +199,7 @@ meta_compositor_x11_manage (MetaCompositor  *compositor,
 
   compositor_x11->have_x11_sync_object = meta_sync_ring_init (xdisplay);
 
-  meta_compositor_redirect_x11_windows (META_COMPOSITOR (compositor));
+  meta_x11_display_redirect_windows (x11_display);
 
   return TRUE;
 }
diff --git a/src/core/display.c b/src/core/display.c
index 5bb34a65ab..111fc781a2 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -628,7 +628,7 @@ create_compositor (MetaDisplay *display)
 }
 
 static void
-meta_display_init (MetaDisplay *disp)
+meta_display_init (MetaDisplay *display)
 {
   /* Some stuff could go in here that's currently in _open,
    * but it doesn't really matter. */
@@ -694,6 +694,7 @@ on_monitor_privacy_screen_changed (MetaDisplay        *display,
                                  : _("Privacy Screen Disabled"));
 }
 
+#ifdef HAVE_X11_CLIENT
 static gboolean
 meta_display_init_x11_display (MetaDisplay  *display,
                                GError      **error)
@@ -719,7 +720,6 @@ meta_display_init_x11_display (MetaDisplay  *display,
   return TRUE;
 }
 
-#ifdef HAVE_WAYLAND
 gboolean
 meta_display_init_x11_finish (MetaDisplay   *display,
                               GAsyncResult  *result,
@@ -818,7 +818,7 @@ on_x11_initialized (MetaDisplay  *display,
   if (!meta_display_init_x11_finish (display, result, &error))
     g_critical ("Failed to init X11 display: %s", error->message);
 }
-#endif
+#endif /* HAVE_X11_CLIENT */
 
 void
 meta_display_shutdown_x11 (MetaDisplay *display)
@@ -933,10 +933,12 @@ meta_display_new (MetaContext  *context,
     {
       MetaWaylandCompositor *wayland_compositor =
         meta_wayland_compositor_get_default ();
-      MetaX11DisplayPolicy x11_display_policy;
 
       meta_wayland_compositor_init_display (wayland_compositor, display);
 
+#ifdef HAVE_XWAYLAND
+      MetaX11DisplayPolicy x11_display_policy;
+
       x11_display_policy = meta_context_get_x11_display_policy (context);
       if (x11_display_policy == META_X11_DISPLAY_POLICY_MANDATORY)
         {
@@ -944,11 +946,12 @@ meta_display_new (MetaContext  *context,
                                  (GAsyncReadyCallback) on_x11_initialized,
                                  NULL);
         }
-
+#endif /* HAVE_XWAYLAND */
       timestamp = meta_display_get_current_time_roundtrip (display);
     }
   else
-#endif
+#endif /* HAVE_WAYLAND */
+#ifdef HAVE_X11
     {
       if (!meta_display_init_x11_display (display, error))
         {
@@ -958,6 +961,11 @@ meta_display_new (MetaContext  *context,
 
       timestamp = display->x11_display->timestamp;
     }
+#else
+    {
+      g_assert_not_reached ();
+    }
+#endif
 
   display->last_focus_time = timestamp;
   display->last_user_time = timestamp;
diff --git a/src/meta/meta-x11-display.h b/src/meta/meta-x11-display.h
index eb84c2b201..2ca9646bf7 100644
--- a/src/meta/meta-x11-display.h
+++ b/src/meta/meta-x11-display.h
@@ -70,4 +70,6 @@ void     meta_x11_display_set_stage_input_region (MetaX11Display *x11_display,
 META_EXPORT
 void     meta_x11_display_clear_stage_input_region (MetaX11Display *x11_display);
 
+META_EXPORT
+void     meta_x11_display_redirect_windows (MetaX11Display *x11_display);
 #endif /* META_X11_DISPLAY_H */
diff --git a/src/x11/meta-x11-display.c b/src/x11/meta-x11-display.c
index b424dee70e..37959e1589 100644
--- a/src/x11/meta-x11-display.c
+++ b/src/x11/meta-x11-display.c
@@ -2327,3 +2327,47 @@ meta_x11_display_clear_stage_input_region (MetaX11Display *x11_display)
   meta_x11_display_set_stage_input_region (x11_display,
                                            x11_display->empty_region);
 }
+
+void
+meta_x11_display_redirect_windows (MetaX11Display *x11_display)
+{
+  MetaBackend *backend = meta_get_backend ();
+  MetaContext *context = meta_backend_get_context (backend);
+  Display *xdisplay = meta_x11_display_get_xdisplay (x11_display);
+  Window xroot = meta_x11_display_get_xroot (x11_display);
+  int screen_number = meta_x11_display_get_screen_number (x11_display);
+  guint n_retries;
+  guint max_retries;
+
+  if (meta_context_is_replacing (context))
+    max_retries = 5;
+  else
+    max_retries = 1;
+
+  n_retries = 0;
+
+  /* Some compositors (like old versions of Mutter) might not properly unredirect
+   * subwindows before destroying the WM selection window; so we wait a while
+   * for such a compositor to exit before giving up.
+   */
+  while (TRUE)
+    {
+      meta_x11_error_trap_push (x11_display);
+      XCompositeRedirectSubwindows (xdisplay, xroot, CompositeRedirectManual);
+      XSync (xdisplay, FALSE);
+
+      if (!meta_x11_error_trap_pop_with_return (x11_display))
+        break;
+
+      if (n_retries == max_retries)
+        {
+          /* This probably means that a non-WM compositor like xcompmgr is running;
+           * we have no way to get it to exit */
+          meta_fatal (_("Another compositing manager is already running on screen %i on display “%s”."),
+                      screen_number, x11_display->name);
+        }
+
+      n_retries++;
+      g_usleep (G_USEC_PER_SEC);
+    }
+}