This issue seems specific to the macOS platform of FLTK since Metal is involved.
Therefore, adding in your code a small bit of Objective-c should be a working solution.

Here is a suggestion:
starting from your Fl_Window * object (which can also be an Fl_Double_Window), say win,
NSView *view = [fl_xid(win) contentView];
will give you the NSView object, view, corresponding to this window,
NSSize s = [view convertSizeToBacking:NSMakeSize(10, 10)];
int scale = (int(s.width + 0.5) > 10 ? 2 : 1);
will give you the correct scale factor for your window, 2 if it's on a retina display,
1 if it's not.

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