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  1. Qt
  2. QTBUG-50719

QOpenGLWidget and QQuickWidget not clipped away when clipRect is empty

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.6.0 RC
    • 5.6.0 Alpha
    • GUI: OpenGL
    • None
    • 920472c85f6a5cd96344c28dbba0f199c34c6c10

    Description

      QTBUG-45860 fixed the biggest issues with clipping render-to-texture widgets. However, one particular case remains broken: when a widget is completely clipped away, it will still show up if there happen to be neighbouring QOpenGL/QuickWidgets around the scroll area.

      This is likely because of the incorrect interpretation of QWidgetPrivate::clipRect. Based on reading various QWidget code, it seems an empty rect indicates clip away completely, instead of no clipping. Currently the composition code in the backingstores interprets empty clipRects as no clipping needed.

      Reproducible with a modified qopenglwidget example.

      Attachments

        1. clip_bad.png
          clip_bad.png
          32 kB
        2. clip_correct.png
          clip_correct.png
          35 kB

        Issue Links

          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-45860 QOpenGLWidget and QQuickWidget fail to apply clipping

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; Flaky tests; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              lagocs Laszlo Agocs
              lagocs Laszlo Agocs
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              Dates

                Created:
                Updated:
                Resolved:

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