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  1. Qt
  2. QTBUG-41103

directfb performance regression from Qt4

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Details

    • Bug
    • Resolution: Invalid
    • Not Evaluated
    • None
    • 5.3.1
    • QPA: DirectFB
    • None

    Description

      With a simple widget that repeatedly draws QPixmaps on the screen we noticed a performance regression of factor 4 from Qt4.

      On the target platform we use the directfb plugin as there's no OpenGL available.

      The diagnostical output of the app looks like this:

      (*) DirectFB/Core: Single Application Core. (2011-08-26 17:23)
(*) Direct/Thread: Started 'VT Switcher' (-1) [CRITICAL OTHER/OTHER 0/0] <8388608>...
(*) Direct/Modules: suppress module 'linux_input'
(*) Direct/Modules: suppress module 'tslib'
(*) Direct/Thread: Started 'Keyboard Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: Keyboard 0.9 (directfb.org)
(*) DirectFB/Graphics: Generic Software Rasterizer 0.6 (directfb.org)
(*) DirectFB/Core/WM: Default 0.3 (directfb.org)
(*) FBDev/Surface: Allocated 800x480 32 bit RGB32 buffer (index 0) at offset 0 and pitch 3200.

      The attached example is performing fine with Qt4 and QWS.

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            rve Anders Bakken
            jbornema Joerg Bornemann
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            Dates

              Created:
              Updated:
              Resolved:

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