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: webkit-qt-boun...@lists.webkit.org [webkit-qt-boun...@lists.webkit.org] on behalf of Turcotte Jocelyn (Nokia-MP/Oslo) Sent: Friday, September 14, 2012 3:53 PM To: zol...@webkit.org; webkit-qt@lists.webkit.org 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: webkit-qt-boun...@lists.webkit.org [webkit-qt-boun...@lists.webkit.org] on behalf of Turcotte Jocelyn (Nokia-MP/Oslo) Sent: Friday, September 14, 2012 3:35 PM To: zol...@webkit.org; webkit-qt@lists.webkit.org 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: webkit-qt-boun...@lists.webkit.org [webkit-qt-boun...@lists.webkit.org] on behalf of ext Zoltan Horvath [zol...@webkit.org] Sent: Friday, September 14, 2012 3:17 PM To: webkit-qt@lists.webkit.org 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 <k...@carewolf.com> 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 > _______________________________________________ > webkit-qt mailing list > webkit-qt@lists.webkit.org > http://lists.webkit.org/mailman/listinfo/webkit-qt _______________________________________________ webkit-qt mailing list webkit-qt@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-qt _______________________________________________ webkit-qt mailing list webkit-qt@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-qt _______________________________________________ webkit-qt mailing list webkit-qt@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-qt _______________________________________________ webkit-qt mailing list webkit-qt@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-qt
