tools: add mks tool for testing

Mostly so I can test the paintable implementation as I go.

tools/meson.build

@@ -1,9 +1,10 @@
 tools = {
   'mks-connect': {},
+  'mks': {},
 }
 
 foreach tool, params: tools
   tool_exe = executable(tool, '@0@.c'.format(tool),
     dependencies: libmks_dep,
   )
-endforeach
+endforeach

tools/mks.c

@@ -0,0 +1,100 @@
+/* mks.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include <unistd.h>
+
+#include <gtk/gtk.h>
+#include <libmks.h>
+
+static GDBusConnection *
+create_connection (int      argc,
+                   char   **argv,
+                   GError **error)
+{
+  if (argc < 2)
+    return g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, error);
+  else
+    return g_dbus_connection_new_for_address_sync (argv[1], 0, NULL, NULL, error);
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_autoptr(GDBusConnection) connection = NULL;
+  g_autoptr(GdkPaintable) paintable = NULL;
+  g_autoptr(MksSession) session = NULL;
+  g_autoptr(MksScreen) screen = NULL;
+  g_autoptr(GMainLoop) main_loop = NULL;
+  g_autoptr(GError) error = NULL;
+  GtkWindow *window;
+  GtkPicture *picture;
+
+  gtk_init ();
+  mks_init ();
+
+  if (!(connection = create_connection (argc, argv, &error)))
+    {
+      g_printerr ("Failed to connect to D-Bus: %s\n", error->message);
+      return EXIT_FAILURE;
+    }
+
+  main_loop = g_main_loop_new (NULL, FALSE);
+
+  window = g_object_new (GTK_TYPE_WINDOW,
+                         "default-width", 800,
+                         "default-height", 600,
+                         "title", "Mouse, Keyboard, Screen",
+                         NULL);
+  picture = g_object_new (GTK_TYPE_PICTURE,
+                          NULL);
+  gtk_window_set_child (window, GTK_WIDGET (picture));
+  g_signal_connect_swapped (window,
+                            "close-request",
+                            G_CALLBACK (g_main_loop_quit),
+                            main_loop);
+
+  if (!(session = mks_session_new_for_connection_sync (connection, NULL, &error)))
+    {
+      g_printerr ("Failed to create MksSession: %s\n", error->message);
+      return EXIT_FAILURE;
+    }
+
+  if (!(screen = mks_session_ref_screen (session)))
+    {
+      g_printerr ("No screen attached to session!\n");
+      return EXIT_FAILURE;
+    }
+
+  if (!(paintable = mks_screen_attach_sync (screen, NULL, &error)))
+    {
+      g_printerr ("Failed to create paintable for screen: %s\n", error->message);
+      return EXIT_FAILURE;
+    }
+
+  gtk_picture_set_paintable (picture, paintable);
+
+  gtk_window_present (window);
+  g_main_loop_run (main_loop);
+
+  return EXIT_SUCCESS;
+}