util: add wlr_addon

1 files changed, 43 insertions, 0 deletions

diff --git a/include/wlr/util/addon.h b/include/wlr/util/addon.h
new file mode 100644
index 00000000..3ad71f54
--- /dev/null
+++ b/include/wlr/util/addon.h
@@ -0,0 +1,43 @@
+/*
+ * 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_UTIL_ADDON_H
+#define WLR_UTIL_ADDON_H
+
+#include <wayland-server-core.h>
+
+struct wlr_addon_set {
+	// private state
+	struct wl_list addons;
+};
+
+struct wlr_addon;
+
+struct wlr_addon_interface {
+	const char *name;
+	void (*destroy)(struct wlr_addon *addon);
+};
+
+struct wlr_addon {
+	const struct wlr_addon_interface *impl;
+	// private state
+	const void *owner;
+	struct wl_list link;
+};
+
+void wlr_addon_set_init(struct wlr_addon_set *set);
+void wlr_addon_set_finish(struct wlr_addon_set *set);
+
+void wlr_addon_init(struct wlr_addon *addon, struct wlr_addon_set *set,
+		const void *owner, const struct wlr_addon_interface *impl);
+void wlr_addon_finish(struct wlr_addon *addon);
+
+struct wlr_addon *wlr_addon_find_by_owner(struct wlr_addon_set *set,
+		const void *owner);
+
+#endif