Implement wlr-layer-shell.

Very WIP, experimenting mainly with nemo-desktop for now.

Author: mtwebster

src/compositor/compositor.c

@@ -998,8 +998,13 @@ sync_actor_stacking (MetaCompositor *compositor)
       children = clutter_actor_get_children (priv->bottom_window_group);
       for (tmp = children; tmp != NULL; tmp = tmp->next)
         {
-          MetaWindowActor *child = tmp->data;
-          MetaWindow *mw = meta_window_actor_get_meta_window (child);
+          ClutterActor *child = tmp->data;
+          MetaWindow *mw;
+
+          if (!META_IS_WINDOW_ACTOR (child))
+            continue;
+
+          mw = meta_window_actor_get_meta_window (META_WINDOW_ACTOR (child));
 
           if (mw != NULL)
             {

src/compositor/meta-surface-actor.c

@@ -94,7 +94,7 @@ get_scaled_region (MetaSurfaceActor     *surface_actor,
   float x, y;
 
   window_actor = meta_window_actor_from_actor (CLUTTER_ACTOR (surface_actor));
-  geometry_scale = meta_window_actor_get_geometry_scale (window_actor);
+  geometry_scale = window_actor ? meta_window_actor_get_geometry_scale (window_actor) : 1;
 
   clutter_actor_get_position (CLUTTER_ACTOR (surface_actor), &x, &y);
   cairo_region_translate (region, x, y);
@@ -331,7 +331,7 @@ meta_surface_actor_is_untransformed (MetaCullable *cullable)
   clutter_actor_get_abs_allocation_vertices (actor, verts);
 
   window_actor = meta_window_actor_from_actor (actor);
-  geometry_scale = meta_window_actor_get_geometry_scale (window_actor);
+  geometry_scale = window_actor ? meta_window_actor_get_geometry_scale (window_actor) : 1;
 
   return meta_actor_vertices_are_untransformed (verts,
                                                 width * geometry_scale,

src/meson.build

@@ -518,6 +518,8 @@ if have_wayland
     'wayland/meta-wayland-dnd-surface.h',
     'wayland/meta-wayland-gtk-shell.c',
     'wayland/meta-wayland-gtk-shell.h',
+    'wayland/meta-wayland-layer-shell.c',
+    'wayland/meta-wayland-layer-shell.h',
     'wayland/meta-wayland.h',
     'wayland/meta-wayland-idle-inhibit.c',
     'wayland/meta-wayland-idle-inhibit.h',
@@ -805,6 +807,7 @@ if have_wayland
   #  - protocol version (if stability is 'unstable')
   wayland_protocols = [
     ['gtk-shell', 'private', ],
+    ['wlr-layer-shell-unstable-v1', 'private', ],
     ['idle-inhibit', 'unstable', 'v1', ],
     ['keyboard-shortcuts-inhibit', 'unstable', 'v1', ],
     ['linux-dmabuf', 'unstable', 'v1', ],