>>
>> I guess these are the two things darktable needs to do on a
>> high-pixel-density  display:
>>
>> - scale up the icon and UI pixels by a factor of 2
>> - reduce downsampling of photos by a factor of 2  (e.g. if a 4K photo
>> will be downsampled as 1K on an ordinary screen, we can display it on
>> a retina screen as 2K)
>
>
> Nah, factor of 2 is too general.
> Because you can set the Retina to different scalings.
> I, for example, prefer one that gives me the same font sizes as on a
> 1920x1080 screen.
> I also have no idea what people are complaining about. DT's info.plist on OS
> X already has the resp. entry, so the OS takes care of scaling fonts in the
> UI. Yes, Icons simply lack the proper resultion but that's a minor thing.
> Any label (typography) looks super crisp.
>

It is completely fine to scale the fonts and icons, however
the point is that photos pixels should *not* be simply scaled up like
the icons by rendering a scaled-down photo pixel into four screen
pixels (for example), instead, darktable should select the display
scaling factor to display the photo, so that the screen resolution can
be fully utilized.

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