title: Is it possible to draw from 2 threads on 1 widget without additional synchronization tools?
body: <p>Imagine that a widget with an extension of 1000 \ 1000 pixels is conditionally vertically divided into two even parts .If I start to draw a picture in coordinates 0 \ 0 at a certain point in time in the number one thread and at the same moment in time in thread number two, I’ll start to draw another picture in the coordinates 0 \ 500 of the same widget, will this be insecure access to the same data? </p>