On Fri, 14 Sep 2012 16:12:00 +0200, <[email protected]> wrote:
> Forget my last comment, this seems to be directly related to the use
of
> QImage instead of QPixmaps.
>
> The directfb platform plugin uses QBlitterPaintEngine which handles
> drawPixmap in QDirectFbBlitter::drawPixmap rather than using straight
> CPU raster for drawImage.
>
> ________________________________________
> From: [email protected]
> [[email protected]] on behalf of Turcotte Jocelyn
> (Nokia-MP/Oslo)
> Sent: Friday, September 14, 2012 3:53 PM
> To: [email protected]; [email protected]
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Ahh it's a canvas test, this might also be related to the deep-copy
> protection that was removed in the patch, when a QPainter is beginning
> on an existing image.
>
> ________________________________________
> From: [email protected]
> [[email protected]] on behalf of Turcotte Jocelyn
> (Nokia-MP/Oslo)
> Sent: Friday, September 14, 2012 3:35 PM
> To: [email protected]; [email protected]
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Why was it necessary to switch from QPixmap to QImage?
>
> I don't think that this can be solved on the Qt side, it's a design
> advantage that QPixmap has in this kind of situations.
> As far as I know this might be mostly related to reusing a graphics
> buffer that already has been uploaded to graphics memory.
>
> Jocelyn
>
> ________________________________________
> From: [email protected]
> [[email protected]] on behalf of ext Zoltan Horvath
> [[email protected]]
> Sent: Friday, September 14, 2012 3:17 PM
> To: [email protected]
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Hi there,
>
> Shouldn't we report this on Qt-side instead?
>
> Cheers,
> Zoltan
>
>
> On Fri, 14 Sep 2012 15:02:13 +0200, Allan Sandfeld Jensen
>
> <[email protected]> wrote:
>> On Friday 14 September 2012, Brianceau, Julien wrote:
>>> With r126284 based webkit version, I get 11,3 displayed fps, with a
CPU
>>> usage of more than 95% With r126284 based webkit version with
changeset
>>> 122720 reverted, I get 25,6 displayed fps, with a CPU usage of about
>>> 90%
>>
>> Yes with a 50% speed regression also on Qt5, I think we need to
revert
>> the
>> patch in trunk, otherwise I would have suggested only reverting it in
>> QtWebKit
>> 2.3. But having as few difference as possible is better, so I am
>> actually
>> relieved it was also slower in Qt5.
>>
>> Cheers
>> `Allan
>> _______________________________________________
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>> [email protected]
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>
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