> I just upgraded to a newer mac laptop, and discovered that fltk apps
> don't render in the new highres mode.  It seems like it shouldn't be
> too hard for text at least, but I wasn't able to find an "enable high
> res" flag after a bit of looking at
>
> https://developer.apple.com/library/mac/#documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Introduction/Introduction.html#//apple_ref/doc/uid/TP40012302-CH1-SW1
>
> There is kWindowHighResolutionCapableAttribute  but it's for Carbon.
> The implication seems to be that for Cocoa apps it should just work.
> Any of the more mac knowledgeable sorts know what's going on here, or
> should I keep poking through the apple docs?
>

I have activated QuartzDebug, as suggested in the above-mentionned
web-page, to test high resolution without a retina display,
and discover that fltk graphics have jagged look everywhere.
What a delusion!
A very strange thing is that system-created windows (the "About
my prog", open/save and print dialogs) also have jagged graphics.
This suggests we miss some application-wide property.
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