Add swaylock protocol, add resource destructors

This prevents sway crashing if swaybg or swaybar dies.

include/extensions.h

@@ -1,18 +1,21 @@
 #ifndef _SWAY_EXTENSIONS_H
 #define _SWAY_EXTENSIONS_H
 
+#include <wayland-server-core.h>
+#include <wlc/wlc-wayland.h>
 #include "wayland-desktop-shell-server-protocol.h"
 #include "list.h"
-#include "wlc/wlc-wayland.h"
 
 struct background_config {
         wlc_handle output;
         wlc_resource surface;
+        struct wl_resource *resource;
 };
 
 struct panel_config {
         wlc_handle output;
         wlc_resource surface;
+        struct wl_resource *resource;
 };
 
 struct desktop_shell_state {
@@ -22,6 +25,12 @@ struct desktop_shell_state {
         struct wlc_size panel_size;
 };
 
+struct swaylock_state {
+        bool active;
+        wlc_handle output;
+        wlc_resource surface;
+};
+
 extern struct desktop_shell_state desktop_shell;
 
 void register_extensions(void);

protocols/CMakeLists.txt

@@ -13,10 +13,21 @@ WAYLAND_ADD_PROTOCOL_SERVER(proto-server-desktop-shell
 	desktop-shell
 )
 
+WAYLAND_ADD_PROTOCOL_CLIENT(proto-client-swaylock
+	swaylock.xml
+	swaylock
+)
+WAYLAND_ADD_PROTOCOL_SERVER(proto-server-swaylock
+	swaylock.xml
+	swaylock
+)
+
 add_library(sway-protocols
 	${proto-client-xdg-shell}
 	${proto-client-desktop-shell}
 	${proto-server-desktop-shell}
+	${proto-client-swaylock}
+	${proto-server-swaylock}
 	)
 
 set(PROTOCOLS_INCLUDE_DIRS ${CMAKE_BINARY_DIR}/protocols PARENT_SCOPE)

protocols/swaylock.xml

@@ -0,0 +1,18 @@
+<protocol name="lock">
+
+  <interface name="lock" version="1">
+    <description summary="create lock screen UIs">
+      The Weston desktop-shell protocol's locking functionality depends more
+      on the behavior of the compositor than of a screen locking client, so
+      another protocol is necessary.
+    </description>
+
+    <request name="set_lock_surface">
+      <arg name="output" type="object" interface="wl_output"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </request>
+
+    <request name="unlock"/>
+
+  </interface>
+</protocol>

sway/extensions.c

@@ -8,6 +8,31 @@
 
 struct desktop_shell_state desktop_shell;
 
+void background_surface_destructor(struct wl_resource *resource) {
+	sway_log(L_DEBUG, "Background surface killed");
+	int i;
+	for (i = 0; i < desktop_shell.backgrounds->length; ++i) {
+		struct background_config *config = desktop_shell.backgrounds->items[i];
+		if (config->resource == resource) {
+			list_del(desktop_shell.backgrounds, i);
+			break;
+		}
+	}
+}
+
+void panel_surface_destructor(struct wl_resource *resource) {
+	sway_log(L_DEBUG, "Panel surface killed");
+	int i;
+	for (i = 0; i < desktop_shell.panels->length; ++i) {
+		struct panel_config *config = desktop_shell.panels->items[i];
+		if (config->resource == resource) {
+			list_del(desktop_shell.panels, i);
+			arrange_windows(&root_container, -1, -1);
+			break;
+		}
+	}
+}
+
 static void set_background(struct wl_client *client, struct wl_resource *resource,
 		struct wl_resource *_output, struct wl_resource *surface) {
 	wlc_handle output = wlc_handle_from_wl_output_resource(_output);
@@ -18,7 +43,9 @@ static void set_background(struct wl_client *client, struct wl_resource *resourc
 	struct background_config *config = malloc(sizeof(struct background_config));
 	config->output = output;
 	config->surface = wlc_resource_from_wl_surface_resource(surface);
+	config->resource = surface;
 	list_add(desktop_shell.backgrounds, config);
+	wl_resource_set_destructor(surface, background_surface_destructor);
 }
 
 static void set_panel(struct wl_client *client, struct wl_resource *resource,
@@ -31,7 +58,9 @@ static void set_panel(struct wl_client *client, struct wl_resource *resource,
 	struct panel_config *config = malloc(sizeof(struct panel_config));
 	config->output = output;
 	config->surface = wlc_resource_from_wl_surface_resource(surface);
+	config->resource = surface;
 	list_add(desktop_shell.panels, config);
+	wl_resource_set_destructor(surface, panel_surface_destructor);
 	desktop_shell.panel_size = *wlc_surface_get_size(config->surface);
 	arrange_windows(&root_container, -1, -1);
 }