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

Thu, 13 Sep 2012 10:44:39 -0700


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 <[email protected]> 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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