Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-25198

Bad image quality using raster and 16 bpp depth

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Reported
    • Priority: P3: Somewhat important
    • Resolution: Unresolved
    • Affects Version/s: 4.8.0, 5.5.1
    • Fix Version/s: None
    • Component/s: GUI: Painting
    • Labels:
      None
    • Environment:
      Fedora 17 Beta RC3
      Qt 4.8.0
      16 bpp, raster graphics system
      xorg-x11-drv-cirrus-1.3.2-18

      Description

      For Fedora 17 Beta RC3 the Xorg maintainers decided to switch Cirrus driver to 16 bpp depth by default for virt. evironments (as the Cirrus/VNC combo in KVM) due to the huge breakage of Gnome Shell. The reason is that 24 bpp (32 bpp is not supported on Cirrus) code path is not very well written/tested/used (but for Qt has been already fixed...).

      You can see the image quality on attached screenshots (KDE Plasma Workspaces but I expect I can write a simple reproducer using QPixmap) - the raster one is corrupted, the native one is ok.

      See https://bugzilla.redhat.com/show_bug.cgi?id=810161 and https://bugzilla.redhat.com/show_bug.cgi?id=809052

        Attachments

        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

            Assignee:
            rodal Samuel Rødal
            Reporter:
            jreznik Jaroslav Reznik
            Votes:
            1 Vote for this issue
            Watchers:
            2 Start watching this issue

              Dates

              Created:
              Updated:

                Gerrit Reviews

                There are no open Gerrit changes