Question about bitmaps and retina / HiDPI

Hi there,

I have a question concerning using high-resolution bitmaps with macOS and 
retina screens.  
It seems there is support for this in wxWidgets, somewhat automagically, by 
putting a regular resolution e.g. "image.png" source file and also a 2x 
resolution e.g. "[email protected]" source file next to it in the same 
directory.  The code seems to indicate that if wxWidgets finds a retina 
screen and a version of the png file with @2x in the filename, then it will 
automatically use the @2x higher-resolution version of the image.
https://github.com/wxWidgets/wxWidgets/blob/master/src/osx/core/bitmap.cpp#L1143

I can't get this to work with wxPython, even though it seems the above 
wxWidgets code is in the version that wxPython uses.

Question 1: Should this work in wxPython?  Is there something I'm not doing 
right?

Question 2: I notice that the wxWidgets code is wrapped in an #if 
wxUSE_IMAGE, and furthermore that wxPython's build_wxwidgets.py doesn't 
seem to use wxUSE_IMAGE.  Is this why I can't get it to work with 
wxPython?  Is there a reason not to use the option wxUSE_IMAGE?

There was another post in wxpython-users about this too: 
https://groups.google.com/forum/#!topic/wxpython-users/EV5rOSohRCE

thanks much for the info,
Matt

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