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  1. Qt
  2. QTBUG-111499

multiple QPainter::drawImage() calls are broken when OpenGL is used

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 5.15.8, 6.4.2
    • GUI: OpenGL, GUI: Painting
    • None
    • All

      When multiple subsequent QPainter::drawImage() cals are made to a QOpenGLWidget based QGraphicsView, only the first image is rendered.

      See the attached example that renders a big image (my samples are > 8192x8192) tiled to the QGraphicView's background. When QOpenGLWidget is used, only the first tile is rendered on Windows. On Linux, the rendering works fine (tested on 2HW configurations Nvidia & AMD). Without OpenGL, the example works on all platforms.

        1. opengl_bug-windows.tar.gz
          1 kB
          Martin Tůma
        2. paris_france-mercator.jpg
          20.04 MB
          Martin Tůma
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            qt.team.graphics.and.multimedia Qt Graphics Team
            tumic Martin Tůma
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