Add wayvncctl capture-changed event

Signed-off-by: Jim Ramsay <i.am@jimramsay.com>

include/ctl-server.h

@@ -76,3 +76,6 @@ void ctl_server_event_disconnected(struct ctl*,
 		const char* client_hostname,
 		const char* client_username,
 		int new_connection_count);
+
+void ctl_server_event_capture_changed(struct ctl*,
+		const char* captured_output);

src/ctl-server.c

@@ -56,6 +56,7 @@ enum cmd_type {
 enum event_type {
 	EVT_CLIENT_CONNECTED,
 	EVT_CLIENT_DISCONNECTED,
+	EVT_CAPTURE_CHANGED,
 	EVT_UNKNOWN,
 };
 #define EVT_LIST_LEN EVT_UNKNOWN
@@ -130,6 +131,14 @@ static struct cmd_info evt_list[] = {
 		"Sent when a vnc client disconnects from wayvnc",
 		{ CLIENT_EVENT_PARAMS("not including") }
 	},
+	[EVT_CAPTURE_CHANGED] = {"capture-changed",
+		"Sent when wayvnc changes which output is captured",
+		{
+			{"output", "The name of the output now being captured"},
+			{NULL, NULL},
+		},
+	},
+
 };
 
 struct cmd {
@@ -1038,3 +1047,10 @@ void ctl_server_event_disconnected(struct ctl* self,
 	ctl_server_event_connect(self, EVT_CLIENT_DISCONNECTED, client_id,
 			client_hostname, client_username, new_connection_count);
 }
+
+void ctl_server_event_capture_changed(struct ctl* self,
+		const char* captured_output)
+{
+	ctl_server_enqueue_event(self, EVT_CAPTURE_CHANGED,
+			json_pack("{s:s}", "output", captured_output));
+}

src/main.c

@@ -1087,6 +1087,8 @@ void set_selected_output(struct wayvnc* self, struct output* output) {
 	self->screencopy.wl_output = output->wl_output;
 	output->on_dimension_change = on_output_dimension_change;
 	output->userdata = self;
+	if (self->ctl)
+		ctl_server_event_capture_changed(self->ctl, output->name);
 	log_selected_output(self);
 }
 

wayvnc.scd

@@ -262,6 +262,16 @@ Parameters:
 *username=...*
 	The username used to authenticate this client. May be null.
 
+_CAPTURE_CHANGED_
+
+The *capture-changed* event is sent when the currently captured output
+changes.
+
+Parameters:
+
+*output=...*
+	The name of the output now being captured.
+
 ## IPC MESSAGE FORMAT
 
 The *wayvncctl(1)* command line utility will construct properly-formatted json