[repack] add graph_t::move_child helper function.
diff --git a/src/graph/graph.hh b/src/graph/graph.hh
index 9ebb57d..435e51a 100644
--- a/src/graph/graph.hh
+++ b/src/graph/graph.hh
@@ -80,6 +80,16 @@
}
}
+ void remove_real_link (unsigned child_index)
+ {
+ for (unsigned i = 0; i < obj.real_links.length; i++)
+ {
+ if (obj.real_links[i].objidx != child_index) continue;
+ obj.real_links.remove (i);
+ break;
+ }
+ }
+
void remap_parents (const hb_vector_t<unsigned>& id_map)
{
for (unsigned i = 0; i < parents.length; i++)
@@ -516,6 +526,37 @@
}
/*
+ * Moves the child of old_parent_idx pointed to by old_offset to a new
+ * vertex at the new_offset.
+ */
+ template<typename O>
+ void move_child (unsigned old_parent_idx,
+ const O* old_offset,
+ unsigned new_parent_idx,
+ const O* new_offset)
+ {
+ auto& old_v = vertices_[old_parent_idx];
+ auto& new_v = vertices_[new_parent_idx];
+
+ unsigned child_id = index_for_offset (old_parent_idx,
+ old_offset);
+
+ auto* new_link = new_v.obj.real_links.push ();
+ new_link->width = O::static_size;
+ new_link->objidx = child_id;
+ new_link->is_signed = 0;
+ new_link->whence = 0;
+ new_link->position = (const char*) old_offset - (const char*) new_v.obj.head;
+ new_link->bias = 0;
+
+ auto& child = vertices_[child_id];
+ child.parents.push (new_parent_idx);
+
+ old_v.remove_real_link (child_id);
+ child.remove_parent (old_parent_idx);
+ }
+
+ /*
* duplicates all nodes in the subgraph reachable from node_idx. Does not re-assign
* links. index_map is updated with mappings from old id to new id. If a duplication has already
* been performed for a given index, then it will be skipped.
