1 files changed, 5 insertions, 0 deletions
diff --git a/sub/sub.h b/sub/sub.h
index f894682596..205aa953d7 100644
--- a/sub/sub.h
+++ b/sub/sub.h
@@ -223,6 +223,11 @@ struct mp_image;
 bool osd_draw_on_image(struct osd_state *osd, struct mp_osd_res res,
                        double video_pts, int draw_flags, struct mp_image *dest);
 
+struct mp_draw_sub_backup;
+void osd_draw_on_image_bk(struct osd_state *osd, struct mp_osd_res res,
+                          double video_pts, int draw_flags,
+                          struct mp_draw_sub_backup *bk, struct mp_image *dest);
+
 struct mp_rect;
 bool sub_bitmaps_bb(struct sub_bitmaps *imgs, struct mp_rect *out_bb);