meson: Allow to build without gnome-desktop

gnome-desktop is used to retrieve the monitor vendor name which in some
use cases is not needed  as it brings a bunch of gnome-desktop unwanted
dependencies.
The change makes mutter fallback to an "Undefined" vendor name if it is
built without gnome-desktop

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2317>

config.h.meson

@@ -46,6 +46,9 @@
 /* Defined if screen cast and remote desktop support is enabled */
 #mesondefine HAVE_REMOTE_DESKTOP
 
+/* Defined if gnome-desktop is enabled */
+#mesondefine HAVE_GNOME_DESKTOP
+
 /* Building with SM support */
 #mesondefine HAVE_SM
 

meson.build

@@ -106,7 +106,6 @@ gthread_dep = dependency('gobject-2.0', version: glib_req)
 gmodule_no_export_dep = dependency('gmodule-no-export-2.0', version: glib_req)
 gnome_settings_daemon_dep = dependency('gnome-settings-daemon')
 json_glib_dep = dependency('json-glib-1.0', version: json_glib_req)
-gnome_desktop_dep = dependency('gnome-desktop-3.0')
 xcomposite_dep = dependency('xcomposite', version: xcomposite_req)
 xcursor_dep = dependency('xcursor')
 xdamage_dep = dependency('xdamage')
@@ -133,6 +132,12 @@ dbus_dep = dependency('dbus-1')
 # For now always require X11 support
 have_x11 = true
 
+
+have_gnome_desktop = get_option('libgnome_desktop')
+if have_gnome_desktop
+  gnome_desktop_dep = dependency('gnome-desktop-3.0')
+endif
+
 have_gl = get_option('opengl')
 if have_gl
   gl_dep = dependency('gl')
@@ -436,6 +441,7 @@ cdata.set('HAVE_WAYLAND', have_wayland)
 cdata.set('HAVE_LIBSYSTEMD', have_libsystemd)
 cdata.set('HAVE_NATIVE_BACKEND', have_native_backend)
 cdata.set('HAVE_REMOTE_DESKTOP', have_remote_desktop)
+cdata.set('HAVE_GNOME_DESKTOP', have_gnome_desktop)
 cdata.set('HAVE_EGL_DEVICE', have_egl_device)
 cdata.set('HAVE_WAYLAND_EGLSTREAM', have_wayland_eglstream)
 cdata.set('HAVE_LIBGUDEV', have_libgudev)
@@ -586,6 +592,7 @@ summary('Wayland EGLStream', have_wayland_eglstream, section: 'Options')
 summary('Native Backend', have_native_backend, section: 'Options')
 summary('EGL Device', have_egl_device, section: 'Options')
 summary('Remote desktop', have_remote_desktop, section: 'Options')
+summary('libgnome-desktop', have_gnome_desktop, section: 'Options')
 summary('gudev', have_libgudev, section: 'Options')
 summary('Wacom', have_libwacom, section: 'Options')
 summary('SM', have_sm, section: 'Options')

meson_options.txt

@@ -57,6 +57,12 @@ option('remote_desktop',
   description: 'Enable remote desktop and screen cast support'
 )
 
+option('libgnome_desktop',
+  type: 'boolean',
+  value: true,
+  description: 'Build with or without gnome-desktop'
+)
+
 option('egl_device',
   type: 'boolean',
   value: false,

src/backends/meta-monitor-manager-private.h

@@ -26,7 +26,10 @@
 
 #include <cogl/cogl.h>
 #include <graphene.h>
+
+#ifdef HAVE_GNOME_DESKTOP
 #include <libgnome-desktop/gnome-pnp-ids.h>
+#endif
 
 #include "backends/meta-backend-private.h"
 #include "backends/meta-cursor.h"
@@ -155,7 +158,9 @@ struct _MetaMonitorManager
 
   MetaMonitorConfigManager *config_manager;
 
+#ifdef HAVE_GNOME_DESKTOP
   GnomePnpIds *pnp_ids;
+#endif
 
   MetaMonitorSwitchConfigType current_switch_config;
 

src/backends/meta-monitor-manager.c

@@ -3816,10 +3816,14 @@ char *
 meta_monitor_manager_get_vendor_name (MetaMonitorManager *manager,
                                       const char         *vendor)
 {
+#ifdef HAVE_GNOME_DESKTOP
   if (!manager->pnp_ids)
     manager->pnp_ids = gnome_pnp_ids_new ();
 
   return gnome_pnp_ids_get_pnp_id (manager->pnp_ids, vendor);
+#else
+  return g_strdup (vendor);
+#endif
 }
 
 gboolean

src/meson.build

@@ -23,13 +23,18 @@ mutter_pkg_deps = [
 
 mutter_pkg_private_deps = [
   gmodule_no_export_dep,
-  gnome_desktop_dep,
   gnome_settings_daemon_dep,
   json_glib_dep,
   libcanberra_dep,
   xkbcommon_dep,
 ]
 
+if have_gnome_desktop
+  mutter_pkg_private_deps += [
+    gnome_desktop_dep,
+  ]
+endif
+
 if have_gl
   mutter_pkg_deps += [
     gl_dep,