static struct window *
window_create_internal(struct display *display,
                       struct window *parent, int type)
{
        struct window *window;

        window = malloc(sizeof *window);
        if (window == NULL)
                return NULL;

        memset(window, 0, sizeof *window);
        window->display = display;
        window->parent = parent;
        window->surface = wl_compositor_create_surface(display->compositor);
        wl_surface_add_listener(window->surface, &surface_listener, window);
        if (type != TYPE_CUSTOM && display->shell) {
                window->shell_surface =
                        wl_shell_get_shell_surface(display->shell,
                                                   window->surface);
                if (window->title)
                        wl_shell_surface_set_title(window->shell_surface,
                                                   window->title);
        }
        window->allocation.x = 0;
        window->allocation.y = 0;
        window->allocation.width = 0;
        window->allocation.height = 0;
        window->saved_allocation = window->allocation;