Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-120455

QPainter coordinates rounding broken when HiDPI scaling is used

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P3: Somewhat important P3: Somewhat important
    • None
    • 6.6.1
    • GUI: High-DPI
    • None
    • Linux/X11, Windows

      QPainter coordinates rounding is broken in in Qt6 when HiDPI scaling is enabled and set to the "typical" value of 125%. The 1px offsets are clearly visible on the attached GPXSee screenshot (Linux/X11, but the same applies to Windows 11).

      The issue affects only the raster renderer, when a QOpenGLWidget is used as the viewport instead of the standard QWidget (select "Use OpenGL" in the "System" preferences of GPXSee), the rounding error vanishes.

        1. rounding-error.mkv
          6.30 MB
        2. Screenshot_20231229_184932.png
          Screenshot_20231229_184932.png
          386 kB
        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            sorvig Morten Sørvig
            tumic Martin Tůma
            Votes:
            1 Vote for this issue
            Watchers:
            3 Start watching this issue

              Created:
              Updated:

                There are no open Gerrit changes