STR: Go to any Amazon.com page; I used http://www.amazon.com/The-Theology-Augustine-Introductory-Important/dp/0801048486/ Actual results: The page seems to start loading OK; the main image for the book comes in, followed by "frequently bought together", "customers who bought this item also bought", etc. Then, after waiting, most of the images on the page repaint with blank white, then repaint again with the intended images. This happens again, but the second time, the main image for the book no longer appears. I should note that this is on a 2560x1440 monitor, with Firefox in full screen, in case it's difficult to get all the stuff on the screen at once.

(In reply to Nathan Froyd [:froydnj] from comment #0) > I should note that this is on a 2560x1440 monitor, with Firefox in full > screen, in case it's difficult to get all the stuff on the screen at once. I can also see this on smaller windows, but I don't see it on my Windows machine at 1920x1080, FWIW.

I see this in my Linux build.

I get a ton of: [GFX2-]: DrawTargetCairo context in error state: invalid matrix (not invertible)(5) from the chrome process BasicCompositor. As far as I can tell, it might just be that DrawTargetCairo goes into an error state as soon as we try to draw with a singular transform, and stays there :-(. For example, we may be drawing a scale(0) transform element and then need to draw something else, but that next thing won't get drawn. I don't see any code that tries to avoid this problem.

Nathan, can you try that patch?

(In reply to Robert O'Callahan (:roc) (Mozilla Corporation) from comment #5) > Nathan, can you try that patch? It doesn't help. :( The repainting seems to happen a little faster, perhaps..? but there's still flashing and every image on the page getting repainted several times.

The 2015-09-18 nightly is good, the 2015-09-19 nightly is bad. Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=11dc79e232110ba6de5179e46dfbda77b52a88c3&tochange=4313752f69956ae248bd4e7ff3913c8dd4252698 Nothing immediately jumps out; bug 1205970 looks like it might be sort of in the right area?

[Tracking Requested - why for this release]: Bad rendering of amazon.com pages. Better pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=11dc79e232110ba6de5179e46dfbda77b52a88c3&tochange=4313752f69956ae248bd4e7ff3913c8dd4252698 Looks like this is bug 1097464. In a working build, you can see the cover of the book tilt as though showing you it has a side and you can open it up. I guess that's done with a 3d transform? I don't know if this entirely solves things; it looks like post-bug 1097464, we only repaint everything once, so we might have introduced another regression in there somewhere?

It seems a dup of bug 1224433. I make this bug depending on bug 1224433 now. And, I will check it later to make sure if this is a duplication.

(In reply to Nathan Froyd [:froydnj] from comment #6) > (In reply to Robert O'Callahan (:roc) (Mozilla Corporation) from comment #5) > > Nathan, can you try that patch? > > It doesn't help. :( The repainting seems to happen a little faster, > perhaps..? but there's still flashing and every image on the page getting > repainted several times. I saw such symptoms without my patch, and I definitely don't see them with the patch. Try results look good so I think we should take the patch anyway.

Bug 1224976. Recover from singular-matrix cairo errors. r=mattwoodrow

Comment on attachment 8690628 [details] MozReview Request: Bug 1224976. Recover from singular-matrix cairo errors. r=mattwoodrow https://reviewboard.mozilla.org/r/25895/#review23273

Robert, I just update patches at bug 1224433. I find it solves the symptoms here too.

(In reply to Robert O'Callahan (:roc) (Mozilla Corporation) from comment #11) > Created attachment 8690628 [details] > MozReview Request: Bug 1224976. Recover from singular-matrix cairo errors. > r=mattwoodrow > > Bug 1224976. Recover from singular-matrix cairo errors. r=mattwoodrow Is this patch relative to bug 1212483?

I don't think so.

https://hg.mozilla.org/integration/mozilla-inbound/rev/8684df98e6495ab2898b4a9da13ecb3777953952 Bug 1224976. Recover from singular-matrix cairo errors. r=mattwoodrow

Wontfix for 43, though this could potentially still make it into 44.

Ryan, why is this FF44 unaffected? A typo perhaps?

This was a regression from bug 1097464, which was backed out from 44. Therefore, 44 is unaffected.

(In reply to Ryan VanderMeulen [:RyanVM] from comment #23) > This was a regression from bug 1097464, which was backed out from 44. > Therefore, 44 is unaffected. Thanks Ryan! Since 44 is unaffected, there is no need to track it.

This along with the change that caused this regression were backed out from Firefox 45. https://hg.mozilla.org/releases/mozilla-aurora/rev/64ec448f156d