154069 2016-02-10 03:19:24 -0800 [Threaded Compositor] Flickering when zooming in/out in maps.google.com 2023-06-21 03:49:27 -0700 1 1 1 Unclassified WebKit WebKit2 WebKit Local Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=258348 Gtk P2 Normal --- 154066 1 cgarcia webkit-unassigned bugs-noreply changseok changseok commit-queue dino graouts kondapallykalyan magomez noam yoon oldest_to_newest 1163442 0 cgarcia 2016-02-10 03:19:24 -0800 Open maps.google.com and zoom in/out with the mouse scroll wheel, you see flickering. 1202498 1 cgarcia 2016-06-14 22:29:05 -0700 I've built with accelerated 2d canvas disabled, and the result is the same. Flickering when zooming and text sometimes disappear, even the background is sometimes fully back. 1202500 2 cgarcia 2016-06-14 22:53:49 -0700 And the same with the redirected X window disabled. 1208591 3 cgarcia 2016-07-07 03:46:00 -0700 Disabling WebGL in MiniBrowser settings fixes the issue, so I guess it's a problem with the threaded compositor and WebGL. 1208601 4 magomez 2016-07-07 05:35:29 -0700 The problem here is that the webgl frames are rendered faster than they are composited. As we only have 2 buffers in GraphicsContext3D to hold the rendered frames, sometimes a buffer is reused for rendering when it hasn't been composited yet (or while it's being composited), and this causes the flickering. I'll attach a patch that fixes this by using one extra buffer to hold the renderings. This removes the flicker issues. But at some point we should add a general solution (also for the acc canvas) that somehow blocks the renderings when there are no buffers available. 1208604 5 283008 magomez 2016-07-07 06:42:13 -0700 Created attachment 283008 Patch 1212320 6 cgarcia 2016-07-19 03:21:06 -0700 (In reply to comment #4) > The problem here is that the webgl frames are rendered faster than they are > composited. > As we only have 2 buffers in GraphicsContext3D to hold the rendered frames, > sometimes a buffer is reused for rendering when it hasn't been composited > yet (or while it's being composited), and this causes the flickering. > > I'll attach a patch that fixes this by using one extra buffer to hold the > renderings. This removes the flicker issues. > > But at some point we should add a general solution (also for the acc canvas) > that somehow blocks the renderings when there are no buffers available. If at some point this is the only blocker to enable the threaded compositor, I prefer to land this to fix the issue. We can always improve it later. 1213067 7 283008 cgarcia 2016-07-21 00:08:17 -0700 Comment on attachment 283008 Patch Let's land this for now, thanks Miguel! File new bug reports for any improvements you might want to do. 1213075 8 283008 commit-queue 2016-07-21 00:30:37 -0700 Comment on attachment 283008 Patch Clearing flags on attachment: 283008 Committed r203498: <http://trac.webkit.org/changeset/203498> 1213076 9 commit-queue 2016-07-21 00:30:44 -0700 All reviewed patches have been landed. Closing bug. 283008 2016-07-07 06:42:13 -0700 2016-07-21 00:30:37 -0700 Patch bug-154069-20160707154139.patch text/plain 8301 magomez U3VidmVyc2lvbiBSZXZpc2lvbjogMjAyODk5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYzhhMWY3MTdiYzM0OTMy NmU3YTMzZDA5ODEzNWQ4YzBlZGY0NWNiMC4uOTE2YjVmY2E3YzdhODNiODNlYjQxNmM1ZTVmZjkw NGFlYjYyM2ZiZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDM3IEBACisyMDE2LTA3LTA3ICBNaWd1 ZWwgR29tZXogIDxtYWdvbWV6QGlnYWxpYS5jb20+CisKKyAgICAgICAgW1RocmVhZGVkIENvbXBv c2l0b3JdIEZsaWNrZXJpbmcgd2hlbiB6b29taW5nIGluL291dCBpbiBtYXBzLmdvb2dsZS5jb20K KyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE1NDA2OQor CisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEFkZCBhIG5l dyBleHRyYSBidWZmZXIgdG8gR3JhcGhpY3NDb250ZXh0M0Qgd2hlbiB1c2luZyB0aGUgVGhyZWFk ZWQgQ29tcG9zaXRvciwKKyAgICAgICAgc28gaXQgZG9lc24ndCBoYXZlIHRvIHJldXNlIHRoZSBi 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