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QT widget based UI rendering slow on qt5 when ported from qt4

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  • SGaistS SGaist

    If you are seeing a slowdown between Qt 4.8.1 and Qt 4.8.7, you should compare the code of both backend to see what's going on.

    L Offline
    L Offline
    linuxsnail
    wrote on last edited by
    #21

    @SGaist Sure that's what I am doing right now but on a separate note is it possible to use any software acceleration with QTWidgets?

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #22

      What software acceleration do you have in mind ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • SGaistS SGaist

        What software acceleration do you have in mind ?

        L Offline
        L Offline
        linuxsnail
        wrote on last edited by
        #23

        @SGaist i just want to understand can opengl or svg libraries be used without gpu or any other backend like directfb can improve performance rendering apart from linuxfb

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #24

          You can use mesa for software based OpenGL rendering (don't expect hight performance).

          SVG is not a screen rendering backend.

          IIRC DirectFB should be faster than plain LinuxFB.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          L 1 Reply Last reply
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          • SGaistS SGaist

            You can use mesa for software based OpenGL rendering (don't expect hight performance).

            SVG is not a screen rendering backend.

            IIRC DirectFB should be faster than plain LinuxFB.

            L Offline
            L Offline
            linuxsnail
            wrote on last edited by
            #25

            @SGaist Ok I believe qt 4 has qt-gfx driver which provides some sort of software acceleration when used with linux fb, any idea qt5 has any such driver which I can use?

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #26

              You have the complete list of backend available here.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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