wayland/xdg-shell: Set the suspended state to suspended windows

This will allow clients to e.g. enter power saving mode when they are
e.g. on another workspace, minimized or fully obstructed.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3019>

meson.build

@@ -47,7 +47,7 @@ gudev_req = '>= 232'
 
 # wayland version requirements
 wayland_server_req = '>= 1.21'
-wayland_protocols_req = '>= 1.31'
+wayland_protocols_req = '>= 1.32'
 
 # native backend version requirements
 libinput_req = '>= 1.19.0'

src/wayland/meta-wayland-versions.h

@@ -36,7 +36,7 @@
 /* Global/master objects (version exported by wl_registry and negotiated through bind) */
 #define META_WL_COMPOSITOR_VERSION          5
 #define META_WL_DATA_DEVICE_MANAGER_VERSION 3
-#define META_XDG_WM_BASE_VERSION            5
+#define META_XDG_WM_BASE_VERSION            6
 #define META_WL_SEAT_VERSION                8
 #define META_WL_OUTPUT_VERSION              4
 #define META_XSERVER_VERSION                1

src/wayland/meta-wayland-window-configuration.c

@@ -49,6 +49,7 @@ meta_wayland_window_configuration_new (MetaWindow          *window,
     .flags = flags,
 
     .is_fullscreen = meta_window_is_fullscreen (window),
+    .is_suspended = meta_window_is_suspended (window),
   };
 
   if (flags & META_MOVE_RESIZE_MOVE_ACTION ||

src/wayland/meta-wayland-window-configuration.h

@@ -51,6 +51,7 @@ struct _MetaWaylandWindowConfiguration
   int bounds_height;
 
   gboolean is_fullscreen;
+  gboolean is_suspended;
 };
 
 MetaWaylandWindowConfiguration * meta_wayland_window_configuration_new (MetaWindow          *window,

src/wayland/meta-wayland-xdg-shell.c

@@ -695,8 +695,9 @@ add_state_value (struct wl_array         *states,
 }
 
 static void
-fill_states (MetaWaylandXdgToplevel *xdg_toplevel,
-             struct wl_array        *states)
+fill_states (MetaWaylandXdgToplevel         *xdg_toplevel,
+             MetaWaylandWindowConfiguration *configuration,
+             struct wl_array                *states)
 {
   MetaWaylandSurfaceRole *surface_role =
     META_WAYLAND_SURFACE_ROLE (xdg_toplevel);
@@ -717,6 +718,10 @@ fill_states (MetaWaylandXdgToplevel *xdg_toplevel,
     add_state_value (states, XDG_TOPLEVEL_STATE_RESIZING);
   if (meta_window_appears_focused (window))
     add_state_value (states, XDG_TOPLEVEL_STATE_ACTIVATED);
+  if (configuration->is_suspended &&
+      wl_resource_get_version (xdg_toplevel->resource) >=
+      XDG_TOPLEVEL_STATE_SUSPENDED_SINCE_VERSION)
+    add_state_value (states, XDG_TOPLEVEL_STATE_SUSPENDED);
 
   if (wl_resource_get_version (xdg_toplevel->resource) >=
       XDG_TOPLEVEL_STATE_TILED_LEFT_SINCE_VERSION)
@@ -749,7 +754,7 @@ meta_wayland_xdg_toplevel_send_configure (MetaWaylandXdgToplevel         *xdg_to
   struct wl_array states;
 
   wl_array_init (&states);
-  fill_states (xdg_toplevel, &states);
+  fill_states (xdg_toplevel, configuration, &states);
 
   if (wl_resource_get_version (xdg_toplevel->resource) >=
       XDG_TOPLEVEL_CONFIGURE_BOUNDS_SINCE_VERSION &&

src/wayland/meta-window-wayland.c

@@ -77,6 +77,8 @@ struct _MetaWindowWayland
   MetaWaylandWindowConfiguration *last_acked_configuration;
 
   gboolean has_been_shown;
+
+  gboolean is_suspended;
 };
 
 struct _MetaWindowWaylandClass
@@ -692,6 +694,23 @@ appears_focused_changed (GObject    *object,
   surface_state_changed (window);
 }
 
+static void
+suspend_state_changed (GObject    *object,
+                       GParamSpec *pspec,
+                       gpointer    user_data)
+{
+  MetaWindow *window = META_WINDOW (object);
+  MetaWindowWayland *wl_window = META_WINDOW_WAYLAND (window);
+  gboolean is_suspended;
+
+  is_suspended = meta_window_is_suspended (window);
+  if (wl_window->is_suspended == is_suspended)
+    return;
+
+  wl_window->is_suspended = is_suspended;
+  surface_state_changed (window);
+}
+
 static void
 on_window_shown (MetaWindow *window)
 {
@@ -714,6 +733,8 @@ meta_window_wayland_init (MetaWindowWayland *wl_window)
 
   g_signal_connect (window, "notify::appears-focused",
                     G_CALLBACK (appears_focused_changed), NULL);
+  g_signal_connect (window, "notify::suspend-state",
+                    G_CALLBACK (suspend_state_changed), NULL);
   g_signal_connect (window, "shown",
                     G_CALLBACK (on_window_shown), NULL);
 }