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

Brianceau, Julien JBrianceau at nds.com
Thu Sep 13 10:31:57 PDT 2012

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,



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