[webkit-qt] [Qt] Strong performance degradation with DirectFB since r122720

[Zoltan Horvath]

Hi Julien,

There are several reasons, please check the mail archive and the related  
bug entries.

Thread about the discussion:  
http://lists.webkit.org/pipermail/webkit-qt/2012-February/002470.html

Can you verify this results with Qt5 as well?

Cheers,
Zoltan

On Thu, 13 Sep 2012 19:31:57 +0200, Brianceau, Julien <JBrianceau at nds.com>  
wrote:

>
> Hello all,
>
>
> I wonder why this changeset has been made :  
> http://trac.webkit.org/changeset/122720
>
>
> QPixmap and QImage are not the same with QPA platforms plugins (e.g.  
> DirectFB).
>
>
> To give you an idea of the performance issue, I performed the following  
> test on my ST armv7 >board :
>
> -          using a Qt 4.8 using QPA with DirectFB platform
>
> -          using WebKit r122719 and r122720
>
> -          using this URL :  
> http://www.craftymind.com/factory/guimark3/bitmap/GM3_JS_Bitmap.html >in  
> a QWebView sized to 1280x720 (with webkit 1 build)
>
>
> With r122719, I get 50,7 displayed fps with a CPU usage of about 25%
>
> With r122720, I fall to 25,3 displayed fps with a CPU usage of more than  
> 90%
>
>
> Is it possible to revert this commit, or at last provide a compilation  
> option to keep QPixmap >as native images ?
>
>
> Please ask if you need further information,
>
>
> Julien
>
>
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