Performance when using qt-gfx-transformed option to rotate the screen



  • Hi,

    I'm working on a graphic application based on Qt-4.7.4 embedded (ARM9, Freescale i.mx233).
    Graphics work on Linux framebuffer, the display driver is the default Freescale distribution one.
    The application was natively written for a 320x240 display and I have to make it run on a 240x320 display, because it is the available LCD on the current hardware.

    I read on previous discussions that I can obtain this by recompiling my app with the -qt-gfx-transformed option and launch the application with ./qt_app -qws -display "Transformed:90:0" &.
    If that is the right way my question is:

    • Does this compile option result in the same cpu consumption of the application, or greater?
      In other words, does Qt work always with a transformation on (a "neutral" one if I don't use the compile option) or does this Qt activate code requiring more cpu effort?

    Any help is appreciated.

    Thanks

    Alberto



  • I also use transform and framebuffer and i didn't notice any change in framerate (QML_SHOW_FRAMERATE environment variable). Try it yourself..


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