rootston: create screenshooter interface

include/rootston/desktop.h

@@ -8,6 +8,7 @@
 #include <wlr/types/wlr_wl_shell.h>
 #include <wlr/types/wlr_xdg_shell_v6.h>
 #include <wlr/types/wlr_gamma_control.h>
+#include <wlr/types/wlr_screenshooter.h>
 #include <wlr/util/list.h>
 #include "rootston/view.h"
 #include "rootston/config.h"
@@ -36,6 +37,7 @@ struct roots_desktop {
 	struct wlr_xdg_shell_v6 *xdg_shell_v6;
 	struct wlr_xwayland *xwayland;
 	struct wlr_gamma_control_manager *gamma_control_manager;
+	struct wlr_screenshooter *screenshooter;
 
 	struct wl_listener output_add;
 	struct wl_listener output_remove;

rootston/desktop.c

@@ -154,16 +154,15 @@ struct roots_desktop *desktop_create(struct roots_server *server,
 	wl_list_init(&desktop->output_remove.link);
 	desktop->output_remove.notify = output_remove_notify;
 
-	wl_signal_add(&server->backend->events.output_add,
-			&desktop->output_add);
+	wl_signal_add(&server->backend->events.output_add, &desktop->output_add);
 	wl_signal_add(&server->backend->events.output_remove,
 		&desktop->output_remove);
 
 	desktop->server = server;
 	desktop->config = config;
 	desktop->layout = wlr_output_layout_create();
-	desktop->compositor = wlr_compositor_create(
-			server->wl_display, server->renderer);
+	desktop->compositor = wlr_compositor_create(server->wl_display,
+		server->renderer);
 
 	desktop->xdg_shell_v6 = wlr_xdg_shell_v6_create(server->wl_display);
 	wl_signal_add(&desktop->xdg_shell_v6->events.new_surface,
@@ -183,6 +182,7 @@ struct roots_desktop *desktop_create(struct roots_server *server,
 
 	desktop->gamma_control_manager = wlr_gamma_control_manager_create(
 		server->wl_display);
+	desktop->screenshooter = wlr_screenshooter_create(server->wl_display);
 
 	return desktop;
 }