Do you have a typical platform dependent issue you're battling with ? Ask it here. Make sure you mention your platform, compiler, and wxWidgets version.
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I'm currently developing an app within the MSW environment and using the 'wxSize fromDPI(wxSize)' function to handle DPI calculations, so when Windows scaling is set to 200% 'fromDPI(wxSize(32,32))' effectively returns a wxSize object where both x and y are set to 64. Whilst this seems to work flawlessly under windows, could somebody please confirm if this currently works under macOS (I currently don't have access to a mac)?
AFAIK OSX handles HiDPI totally different than Windows. On retina displays the app only "sees" logical screen coordinates that are smaller than the physical ones. Check what you get as screen size.
Use the source, Luke!