feautre: added undo/redo buttons

The change history is kept in a ring buffer of definite size 2000.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cdraw.h b/src/cdraw.h
index 38bb058..1d66b6b 100644
--- a/src/cdraw.h
+++ b/src/cdraw.h
@@ -29,6 +29,8 @@ void            user_canvas_import_png(const Arg *);
 void            user_canvas_refresh(const Arg *);
 void            user_canvas_create_new(const Arg *);
 void            user_canvas_pal_col_chng(const Arg *);
+void            user_canvas_undo(const Arg *);
+void            user_canvas_redo(const Arg *);
 void            user_tool_change(const Arg *);
 void            user_layer_chng(const Arg *);
 void            user_testing_layer_add(const Arg *);