Does it have cross platform Hi-DPI support? No.
Are you joking? I can't tell. Just in case you aren't, what do you think is required for a platform to support Hi-DPI displays?
When I use a hi-DPI display (like 4K displays), a lot of old software renders text and widgets too small to see, because they were programmed to display things as so-many pixels high, without concern for DPI. It's frequently a problem with old video games, though it affects regular applications too.