168911 2017-02-27 04:27:31 -0800 [GTK] Flickering when leaving accelerated compositing mode 2017-02-27 06:40:48 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Local Build Unspecified Unspecified RESOLVED FIXED Gtk P2 Normal --- 1 cgarcia webkit-unassigned bugs-noreply oldest_to_newest 1281351 0 cgarcia 2017-02-27 04:27:31 -0800 It doesn't always happen, and it too fast, more noticeable in website with a dark background, because we are drawing a single white fame. This happens when we leave AC mode and the threaded compositor is still rendering a frame. The render layer compositor already detached the root layer, so the threaded compositor doesn't actually render any of its layer (the backing store of all the layers has been destroyed at this point). However, CoordinatedGraphicsScene::paintToCurrentGLContext() always renders a white background when no web view color has been set. And that's the white frame we get. Rendering the web view background in CoordinatedGraphicsScene::paintToCurrentGLContext() is not needed at all, because the web view already takes care of rendering its background. So, we can simply remove the m_viewBackgroundColor member from CoordinatedGraphicsScene because nobody is actually calling setViewBackgroundColor() and we never want to draw a white background either. 1281352 1 302837 cgarcia 2017-02-27 04:30:00 -0800 Created attachment 302837 Patch 1281353 2 302837 zan 2017-02-27 04:44:58 -0800 Comment on attachment 302837 Patch Does this cause any change in behavior when loading pages in forced accelerated mode? E.g. the inital screen not being white? 1281354 3 cgarcia 2017-02-27 04:51:53 -0800 (In reply to comment #2) > Comment on attachment 302837 [details] > Patch > > Does this cause any change in behavior when loading pages in forced > accelerated mode? E.g. the inital screen not being white? No, the web view renders the white background. 1281361 4 302839 cgarcia 2017-02-27 06:24:09 -0800 Created attachment 302839 New patch This is a simpler approach suggested by Zan, thanks! 1281365 5 cgarcia 2017-02-27 06:40:48 -0800 Committed r213060: <http://trac.webkit.org/changeset/213060> 302837 2017-02-27 04:30:00 -0800 2017-02-27 06:24:09 -0800 Patch wk2-flickering.diff text/plain 4521 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJLaXQyL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQyL0No YW5nZUxvZwppbmRleCBjOTIzMDY5Mzc2My4uMjE5MDE0ZDk2NjAgMTAwNjQ0Ci0tLSBhL1NvdXJj ZS9XZWJLaXQyL0NoYW5nZUxvZworKysgYi9Tb3VyY2UvV2ViS2l0Mi9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyOCBAQAorMjAxNy0wMi0yNyAgQ2FybG9zIEdhcmNpYSBDYW1wb3MgIDxjZ2FyY2lhQGln YWxpYS5jb20+CisKKyAgICAgICAgW0dUS10gRmxpY2tlcmluZyB3aGVuIGxlYXZpbmcgYWNjZWxl cmF0ZWQgY29tcG9zaXRpbmcgbW9kZQorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9z aG93X2J1Zy5jZ2k/aWQ9MTY4OTExCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BT 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