scene_graph: Maintain `wlr_scene_node`s for the sway tree.

1 files changed, 29 insertions, 0 deletions

diff --git a/sway/tree/node.c b/sway/tree/node.c
index 12361c75..213cf0a6 100644
--- a/sway/tree/node.c
+++ b/sway/tree/node.c
@@ -159,3 +159,32 @@ bool node_has_ancestor(struct sway_node *node, struct sway_node *ancestor) {
         }
         return false;
 }
+
+void scene_node_disown_children(struct wlr_scene_tree *tree) {
+        // this function can be called as part of destruction code that will be invoked
+        // upon an allocation failure. Let's not crash on NULL due to an allocation error.
+        if (!tree) {
+                return;
+        }
+
+        struct wlr_scene_node *child, *tmp_child;
+        wl_list_for_each_safe(child, tmp_child, &tree->children, link) {
+                wlr_scene_node_reparent(child, root->staging);
+        }
+}
+
+struct wlr_scene_tree *alloc_scene_tree(struct wlr_scene_tree *parent,
+                bool *failed) {
+        // fallthrough
+        if (*failed) {
+                return NULL;
+        }
+
+        struct wlr_scene_tree *tree = wlr_scene_tree_create(parent);
+        if (!tree) {
+                sway_log(SWAY_ERROR, "Failed to allocate a scene node");
+                *failed = true;
+        }
+
+        return tree;
+}