[GTK] Accelerated compositing mode is in poor state

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Michael Catanzaro]

Unfortunately accelerated compositing mode has suffered some regressions between 2.22 (where I believe it was working *almost* well enough) and 2.23.1. I've made the executive decision to disable AC mode in Epiphany git master since this fixes several issues, including annoying issues with GitLab that were making development difficult. I'll leave it enabled in 3.30 for a while longer because 3.30 branch users are expected to use 2.22, but when we get closer to 2.24 release I'll go back and disable it there too.

Here are the issues:

 * Bug #178387 (an old bug, but I do not remember hitting it in 2.22)
 * Bug #182276 (seems like a recent regression)
 * Bug #192230 (seems like a recent regression)
 * Bug #192522 (not a regression from 2.22, but a blocker for Epiphany regardless)

I'm also tracking this as https://gitlab.gnome.org/GNOME/epiphany/issues/595.

[Michael Catanzaro]

(In reply to Michael Catanzaro from comment #0)
>  * Bug #182276 (seems like a recent regression)

Oops, bug #192276

[Michael Catanzaro]

Does anyone know of any websites other than https://webkit.org/blog-files/3d-transforms/poster-circle.html that are broken by having disabled AC mode?

[Carlos Bentzen]

(In reply to Michael Catanzaro from comment #2)
> Does anyone know of any websites other than
> https://webkit.org/blog-files/3d-transforms/poster-circle.html that are
> broken by having disabled AC mode?

Any website that uses CSS 3D transforms?

Tested a few from https://www.creativebloq.com/css3/20-stunning-examples-css-3d-transforms-11112759 and seems like it.

[Michael Catanzaro]

Yeah, but I suppose I was looking for something other than a test/example websites. We know many websites trigger AC mode by using 3D transforms, but almost none of them appear to suffer any functionality regression when it is turned off. And for some users, these websites are only usable once it is turned off.

Basically we need to decide if losing 3D transforms is worth the cost of dependent bug #178387, bug #192522, bug #192982, bug #193001, bug #193011, etc.

[Michael Catanzaro]

I suppose my hypothesis is: the set of websites harmed by leaving AC mode enabled on-demand is overwhelmingly larger than the set of websites harmed by turning it off.

[Zan Dobersek]

Removing the WPE tag because the remaining bugs are either stale/unconfirmed or simply unrelated to WPE, and because the idea in comment #4 is not compatible with WPE roadmap.

[Fujii Hironori]

IIRC, WebInspector's element highlight is using GraphicsLayer.

[Michael Catanzaro]

(In reply to Michael Catanzaro from comment #4)
> Basically we need to decide if losing 3D transforms is worth the cost of
> dependent bug #178387, bug #192522, bug #192982, bug #193001, bug #193011,
> etc.

All of these except bug #193011 have now been solved.

If we buy the needed hardware and fix bug #193011, then we could try turning AC mode back on in Epiphany. Hopefully any users complaining about AC mode performance have similar hardware. And if not, well, no point in worrying about future bug reports before they arrive.

[Carlos Garcia Campos]

(In reply to Michael Catanzaro from comment #8)
> (In reply to Michael Catanzaro from comment #4)
> > Basically we need to decide if losing 3D transforms is worth the cost of
> > dependent bug #178387, bug #192522, bug #192982, bug #193001, bug #193011,
> > etc.
> 
> All of these except bug #193011 have now been solved.
> 
> If we buy the needed hardware and fix bug #193011, then we could try turning
> AC mode back on in Epiphany. Hopefully any users complaining about AC mode
> performance have similar hardware. And if not, well, no point in worrying
> about future bug reports before they arrive.

Or we can disable AC only for that particular hardware

[Michael Catanzaro]

(In reply to Carlos Garcia Campos from comment #9)
> Or we can disable AC only for that particular hardware

Yes indeed.

[Michael Catanzaro]

All issues are closed.

I'll reenable AC mode in Ephy soon if no more issues are reported. I'm sure we will get more bug reports, but it doesn't make sense to worry too much about bugs that haven't been reported yet.

[Michael Catanzaro]

Reopening due to bug #200575.

[Michael Catanzaro]

All fixed again.

[Michael Catanzaro]

Reopening due to bug #202362.

[james]

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[Michael Catanzaro]

All dependent bugs closed, thanks everyone!