I see there has been effort in the Processing3 source to try to get DPI from the system but only for Windows so far. I know DPI scaling has always been a mess in Java and everywhere else…
Thanks @neilcsmith, setting the Processing preference for zoom at 200% and launching the PDE (4.x) with “-Dsun.java2d.uiScale=1” makes it look approximately consistent with everything else on my system. I have Unity scaling set at 1.5.
Neither the Processing zoom preference or “-Dsun.java2d.uiScale=1” appeared to change the behavior of the dimensions of the default (JAVA2D) renderer in 4.x as mentioned in my previous post. It seems to create a window with double the dimensions passed to size(…) which doesn’t happen in Processing 3.
Also inconsistent with Processing 3, 4.x sketch windows for P2D / P3D are not automatically centered on screen.
I also noticed on 4.x (even with default settings and no additional command line options on launch) that fullScreen windows for FX2D and P3D / P2D look to be half the size they are supposed to be in both dimensions. Similar to what @hooeef mentioned, the fullScreen window for JAVA2D does not draw over the Unity top bar thing and instead seems to be displaced below it and cut off at the bottom of the screen, but this is the same behavior as Processing 3 on my system.