Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-74492

QWebEngineView: A blinking white dot displays on dark website

    XMLWordPrintable

Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.12.5, 5.13.1, 5.14.0 Alpha
    • 5.12.0, 5.12.2
    • GUI: OpenGL
    • None
    • Windows
    • cc873ec23a98ac32d10ac5fa569792fde2f6b2c8 (qt/qtbase/5.12)

    Description

      Simplified bug report

      A blinking white dot appears on the window / widget when using OpenGL on Windows.

      According to a few people it can be reproduced with multiple examples:

      1. "Qt Quick Controls - Gallery" example: qt_source/qtquickcontrols2/examples/quickcontrols2/gallery/gallery.pro
      2. https://bugreports.qt.io/secure/attachment/84270/84270_mcve_74492.cpp
      3. import QtQuick 2.12
        import QtQuick.Window 2.12
        
        Window {    
          visible: true    
          width: 640    
          height: 480    
          color: 'black'   
         
          TextEdit {        
            anchors.centerIn: parent        
            width: 200        
            height: 20        
            text: 'Sample text'        
            color: 'red'    
          }
        }

      Platform is Windows, details environment info is in Environment field.

      Original bug report below

      Note that this is independent of WebEngine and also happens with a variety of other Qt modules that use OpenGL (in contrast to OpenGL ES or software rendering).

      For example open https://www.speedtest.net/fr for example you will see a blinking  white dot at the middle of the webview parasiting the display

      This blinking dot shows up in many other website when the background is dark. 

      The blinking dot shows up also on some youtube video.

      Again you can see the blinking dot on the error when you open any metacafe video, (metacafe doesn't work with webengine it's another bug, but the intersting thing here is the white dot) 

      Reportedly introduced by "Fix automatic showing/hiding of the Windows 10 on-screen keyboard" 3d867b8 https://codereview.qt-project.org/c/qt/qtbase/+/232927

      Attachments

        1. Screenshot 2019-07-02 at 18.35.00.png
          Screenshot 2019-07-02 at 18.35.00.png
          1.27 MB
        2. Screen Recording 2019-05-28 at 15.45.16.mov
          4.48 MB
        3. qtdiag.txt
          8 kB
        4. qtbug74492.qml
          0.3 kB
        5. mcve_andre_74492.7z
          0.7 kB
        6. mcve_74492.py
          1 kB
        7. mcve_74492.cpp
          0.7 kB
        8. image-2019-03-16-20-47-10-288.png
          image-2019-03-16-20-47-10-288.png
          87 kB
        9. image-2019-03-16-20-35-58-680.png
          image-2019-03-16-20-35-58-680.png
          236 kB
        10. image-2019-03-16-20-34-45-254.png
          image-2019-03-16-20-34-45-254.png
          234 kB
        11. evil_dot_4.png
          evil_dot_4.png
          31 kB
        12. evil_dot_3.png
          evil_dot_3.png
          137 kB
        13. evil_dot_2.png
          evil_dot_2.png
          101 kB
        14. evil_dot_1.png
          evil_dot_1.png
          49 kB
        15. bpl_system_information.txt
          10 kB
        16. 2019-05-28_14-53-22.gif
          2019-05-28_14-53-22.gif
          37 kB
        17. 2019-05-28_13-20-55.gif
          2019-05-28_13-20-55.gif
          35 kB
        18. 2019-05-28_13-20-00.gif
          2019-05-28_13-20-00.gif
          51 kB

        Issue Links

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

          Activity

            People

              anrocha André De La Rocha (Inactive)
              navis-raven Dragoon Gryffoon
              Votes:
              4 Vote for this issue
              Watchers:
              12 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes