I'd like to recreate the same style that OSM use when editing polygons. I'm calling it an 'interior stroke' or 'interior buffer'.
OSM example:
I know that I can use an array of ol.style.Style, with one sending back geometry for the interior buffer. However it seems really resource intensive to create new geometries simply to represent the original geometry with a buffer. Is that the recommended way? Can I use ol.style.Stroke in some advanced manner?
An additional feature is that the screen pixel width of the 'interior stroke' is a constant amount, irrespective of zoom level. For example, here's that polygon zoomed out and in:
