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  1. #1
    Registered User
    Join Date
    Jul 2010
    Posts
    99

    Qimage drawing SLOWER on Symbian^3 than S60v5?

    In my app i am displaying raster maps of about 640x640px.

    I load them into QImage and then i paint on the screen applying to the QPainter a QTransform with scaling and rotating.

    On my old 5800XM it works very fast, i can scale&resize&display at least five of those images with no slowdown (then i fill up the phone memory).

    On a new C7 instead even displaying just one is so slow to be unusable...


    Is there something special i should be aware of?
    Is it due to Symbin^3 using OpenVG instead of Raster?
    Can i switch back to raster in my code?
    Can i improve this by forcing the image depth of the QImages?

    Please, any pointer to find the root of the problem and any hope to fix it...

    thanks!
    Last edited by gardiol; 2011-04-18 at 13:24.

  2. #2
    Nokia Developer Expert
    Join Date
    Mar 2003
    Posts
    6

    Re: Qimage drawing SLOWER on Symbian^3 than S60v5?

    You should use QPixmap instead of QImage to get the optimal performance

  3. #3
    Registered User
    Join Date
    Jun 2007
    Location
    Mumbai, India
    Posts
    1,998

    Re: Qimage drawing SLOWER on Symbian^3 than S60v5?

    But using QPixmap you can't get to the pixel data directly for manipulation. And if using QImage it doesn't make use of graphics hardware so one might find it slow.

  4. #4
    Registered User
    Join Date
    Jul 2010
    Posts
    99

    Re: Qimage drawing SLOWER on Symbian^3 than S60v5?

    Now i try to draw in a QImage then convert to QPixmap and "paint" that. I hope this will speed up since i draw only once, then i need to paint the image to the screeen at each frame!

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