I have made two test builds to experiment with adapting REW to high DPI screens, one for Windows-64 and one for Linux. MacOS builds already adapt to retina screens automatically. If the screen is above 96 DPI the fonts and icons will be adjusted to suit. Scaling of fonts can be enabled or disabled via a new View preference setting
Scale fonts for display DPI. Fonts will only be scaled if the resolution is more than 96 DPI.
Edit: builds removed with release of V5.20 beta 54.
Scaling will have no effect on Windows unless the
High DPI scaling override is enabled with scaling set to
Application. That property can be changed by right-clicking on the REW shortcut, selecting Properties, then the Compatibility tab, then the
Change high DPI settings button.
On Linux it may be necessary to set the DPI figure, for example using
xrandr --dpi 192 to set 192 DPI.
On both builds the DPI figure REW is being given can be viewed in the About REW dialog:
The builds will be available for the next few days for anyone that would like to try them out and provide feedback here on how it goes.