-// do_canvas - 1 for incremental drawing of resources
-// FORCE_REDRAW for delete and redraw of resources
-// IGNORE_THREAD to ignore picon thread
+// do_canvas -
+// NO_DRAW disable canvas draw
+// IGNORE_THREAD to ignore picon thread
+// NORMAL_DRAW for incremental drawing of resources
+// FORCE_REDRAW for delete and redraw of resources