RESOLVED FIXED 117330
[Qt]CSS webkitTransform animation using translate-3d on composited layer is not correctly rendered and leaking memory 
https://bugs.webkit.org/show_bug.cgi?id=117330
Summary [Qt]CSS webkitTransform animation using translate-3d on composited layer is n...
Chen Zhixiang
Reported 2013-06-06 19:43:49 PDT
Use the attached test case, When the images slide(using CSS transfrom:rotate-3d) The background layer images are still there, And memory is leaking Well, Firefox renders this case good.
Attachments
A simple test case for css transform animation using setInterval & translate-3d (1.02 KB, text/html)
2013-06-06 19:56 PDT, Chen Zhixiang 		no flags
Details
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Chen Zhixiang
Comment 1 2013-06-06 19:55:26 PDT
Verified at a recent QtWebKit and Chrome 27. But Qt-5.0.2 WebKit has no such problem. So maybe this problem has been fixed in trunk.
Chen Zhixiang
Comment 2 2013-06-06 19:56:44 PDT
Created attachment 203992 [details] A simple test case for css transform animation using setInterval & translate-3d
Chen Zhixiang
Comment 3 2013-06-13 23:01:28 PDT
This case occurs at Qt-4.8.x with "-platform xlibgl" enable and WebKit with a version at 2012/3/7 nearby. Since Qt-5 has switched to xcb, and dropped xlib(and xlibgl also) support, this may not be fixed in the future?
Chen Zhixiang
Comment 4 2013-06-13 23:03:51 PDT
Source\WebCore\platform\graphics\texmap\TextureMapper.cpp: TextureMapper uses TextureMapperImageBuffer, though macro switch USE(ACCELERATED_COMPOSITING) is ON.
Chen Zhixiang
Comment 5 2013-06-14 00:07:54 PDT
Bug 102011 seems to be related to this problem.
Chen Zhixiang
Comment 6 2013-06-20 20:34:08 PDT
Problem fixed: This is due to under opengl graphics driver not supporting multi-sample feature, combined with Qt-4.8.x's not correctly fbo pool implementation. #see https://bugreports.qt-project.org/browse/QTBUG-31891
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