xdg-toplevel-tag-v1: new protocol

References: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/238

include/wlr/types/wlr_xdg_toplevel_tag_v1.h

@@ -0,0 +1,41 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_XDG_TOPLEVEL_TAG_V1_H
+#define WLR_TYPES_WLR_XDG_TOPLEVEL_TAG_V1_H
+
+#include <wayland-server-core.h>
+
+struct wlr_xdg_toplevel_tag_manager_v1 {
+	struct wl_global *global;
+
+	struct {
+		struct wl_signal set_tag; // struct wlr_xdg_toplevel_tag_manager_v1_set_tag_event
+		struct wl_signal set_description; // struct wlr_xdg_toplevel_tag_manager_v1_set_description_event
+		struct wl_signal destroy;
+	} events;
+
+	struct {
+		struct wl_listener display_destroy;
+	} WLR_PRIVATE;
+};
+
+struct wlr_xdg_toplevel_tag_manager_v1_set_tag_event {
+	struct wlr_xdg_toplevel *toplevel;
+	const char *tag;
+};
+
+struct wlr_xdg_toplevel_tag_manager_v1_set_description_event {
+	struct wlr_xdg_toplevel *toplevel;
+	const char *description;
+};
+
+struct wlr_xdg_toplevel_tag_manager_v1 *wlr_xdg_toplevel_tag_manager_v1_create(
+	struct wl_display *display, uint32_t version);
+
+#endif

protocol/meson.build

@@ -42,6 +42,7 @@ protocols = {
 	'xdg-dialog-v1': wl_protocol_dir / 'staging/xdg-dialog/xdg-dialog-v1.xml',
 	'xdg-system-bell-v1': wl_protocol_dir / 'staging/xdg-system-bell/xdg-system-bell-v1.xml',
 	'xdg-toplevel-icon-v1': wl_protocol_dir / 'staging/xdg-toplevel-icon/xdg-toplevel-icon-v1.xml',
+	'xdg-toplevel-tag-v1': wl_protocol_dir / 'staging/xdg-toplevel-tag/xdg-toplevel-tag-v1.xml',
 	'xwayland-shell-v1': wl_protocol_dir / 'staging/xwayland-shell/xwayland-shell-v1.xml',
 	'tearing-control-v1': wl_protocol_dir / 'staging/tearing-control/tearing-control-v1.xml',
 

types/meson.build

@@ -103,6 +103,7 @@ wlr_files += files(
 	'wlr_xdg_output_v1.c',
 	'wlr_xdg_system_bell_v1.c',
 	'wlr_xdg_toplevel_icon_v1.c',
+	'wlr_xdg_toplevel_tag_v1.c',
 )
 
 if features.get('drm-backend')

types/wlr_xdg_toplevel_tag_v1.c

@@ -0,0 +1,104 @@
+#include <assert.h>
+#include <stdlib.h>
+
+#include <wlr/types/wlr_xdg_shell.h>
+#include <wlr/types/wlr_xdg_toplevel_tag_v1.h>
+
+#include "xdg-toplevel-tag-v1-protocol.h"
+
+#define MANAGER_VERSION 1
+
+static const struct xdg_toplevel_tag_manager_v1_interface manager_impl;
+
+static struct wlr_xdg_toplevel_tag_manager_v1 *manager_from_resource(
+		struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource, &xdg_toplevel_tag_manager_v1_interface, &manager_impl));
+	return wl_resource_get_user_data(resource);
+}
+
+static void manager_handle_set_tag(struct wl_client *client, struct wl_resource *manager_resource,
+		struct wl_resource *toplevel_resource, const char *tag) {
+	struct wlr_xdg_toplevel_tag_manager_v1 *manager = manager_from_resource(manager_resource);
+	struct wlr_xdg_toplevel *toplevel = wlr_xdg_toplevel_from_resource(toplevel_resource);
+
+	struct wlr_xdg_toplevel_tag_manager_v1_set_tag_event event = {
+		.toplevel = toplevel,
+		.tag = tag,
+	};
+	wl_signal_emit_mutable(&manager->events.set_tag, &event);
+}
+
+static void manager_handle_set_description(struct wl_client *client, struct wl_resource *manager_resource,
+		struct wl_resource *toplevel_resource, const char *description) {
+	struct wlr_xdg_toplevel_tag_manager_v1 *manager = manager_from_resource(manager_resource);
+	struct wlr_xdg_toplevel *toplevel = wlr_xdg_toplevel_from_resource(toplevel_resource);
+
+	struct wlr_xdg_toplevel_tag_manager_v1_set_description_event event = {
+		.toplevel = toplevel,
+		.description = description,
+	};
+	wl_signal_emit_mutable(&manager->events.set_description, &event);
+}
+
+static void manager_handle_destroy(struct wl_client *client, struct wl_resource *manager_resource) {
+	wl_resource_destroy(manager_resource);
+}
+
+static const struct xdg_toplevel_tag_manager_v1_interface manager_impl = {
+	.destroy = manager_handle_destroy,
+	.set_toplevel_tag = manager_handle_set_tag,
+	.set_toplevel_description = manager_handle_set_description,
+};
+
+static void manager_bind(struct wl_client *client, void *data, uint32_t version, uint32_t id) {
+	struct wlr_xdg_toplevel_tag_manager_v1 *manager = data;
+
+	struct wl_resource *resource = wl_resource_create(client,
+		&xdg_toplevel_tag_manager_v1_interface, version, id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+	wl_resource_set_implementation(resource, &manager_impl, manager, NULL);
+}
+
+static void manager_handle_display_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_toplevel_tag_manager_v1 *manager =
+		wl_container_of(listener, manager, display_destroy);
+
+	wl_signal_emit_mutable(&manager->events.destroy, NULL);
+
+	assert(wl_list_empty(&manager->events.set_tag.listener_list));
+	assert(wl_list_empty(&manager->events.set_description.listener_list));
+	assert(wl_list_empty(&manager->events.destroy.listener_list));
+
+	wl_list_remove(&manager->display_destroy.link);
+	wl_global_destroy(manager->global);
+	free(manager);
+}
+
+struct wlr_xdg_toplevel_tag_manager_v1 *wlr_xdg_toplevel_tag_manager_v1_create(
+		struct wl_display *display, uint32_t version) {
+	assert(version <= MANAGER_VERSION);
+
+	struct wlr_xdg_toplevel_tag_manager_v1 *manager = calloc(1, sizeof(*manager));
+	if (manager == NULL) {
+		return NULL;
+	}
+
+	manager->global = wl_global_create(display, &xdg_toplevel_tag_manager_v1_interface,
+		version, manager, manager_bind);
+	if (manager->global == NULL) {
+		free(manager);
+		return NULL;
+	}
+
+	wl_signal_init(&manager->events.set_tag);
+	wl_signal_init(&manager->events.set_description);
+	wl_signal_init(&manager->events.destroy);
+
+	manager->display_destroy.notify = manager_handle_display_destroy;
+	wl_display_add_destroy_listener(display, &manager->display_destroy);
+
+	return manager;
+}