I filed this bug regarding the high dpi scaling on Linux when using the FXCanvas for SWT: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8233181 I think I found the problem in the FXCancas class whereas the Linux case is simply not handled: https://github.com/openjdk/jfx/blob/master/modules/javafx.swt/src/main/java/javafx/embed/swt/FXCanvas.java#L174
https://github.com/openjdk/jfx/blob/master/modules/javafx.swt/src/main/java/javafx/embed/swt/FXCanvas.java#L240 In both cases the scale factor for MacOSX and Windows is returned (by reflection) but not for Linux which I think i the same method as for Windows. Thus the scaling factor is always 1 which leads to this graphical distortion (if I set the scale with DPIUtil.setScale differently I can also cause a distortion!) However I was not able to built openjfx on Ubuntu 19.10 so far. Is there a gradle command to built the swt module only? @Kevin Rushforth: can you confirm that this is the cause for the bug? Unfortunately there is no issue tab on the Github page so I post here.
