1313628 - Non-stop repainting of transform animation after CSS positioned mask enabled

Status: RESOLVED DUPLICATE of bug 1234485

(Core :: Layout, defect)

Description

[Loic]

+++ This bug was initially created as a clone of Bug #1313332 +++

Steps to reproduce:

1) about:config > nglayout.debug.paint_flashing = true
2) Visit https://cityecho.ca/rentopedia and check the red radar spinner

Actual results:
Non-stop repainting of the rectangle layer containing the radar spinner.

Regression range:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=906c1f635c43ca24c685c7d1343d58eb0e4b0baf&tochange=bb8f2e88d99176437cdee6f4d50e6c5cd6a91f60

Astley Chen — Bug 1294660: Part 1 - enable CSS positioned mask on nightly and aurora. r=glandium


Is this non-stop repainting expected?

Comment 1

[u459114]

Yes, it's expected behavior. All OMTA in a masked box are disable.
Bug 1234485 is filed to improve this symptom, please refer to bug 1234485 comment 20. I am active working on it.

Comment 2

[Astley Chen (inactive)]

(In reply to C.J. Ku[:cjku](UTC+8) from comment #1)
> Yes, it's expected behavior. All OMTA in a masked box are disable.
> Bug 1234485 is filed to improve this symptom, please refer to bug 1234485
> comment 20. I am active working on it.

As CJ's reply, it's a known issue and being actively worked by CJ now.
Let's track the status on bug 1234485.
Thanks.

Comment 3

[u459114]

By apply the patches in bug 1234485, OMTA works normally.

Comment 4

[u459114]

Attachment: Paint mask on mask layer

Left hand side the original way, using basic layer manager, paint masked elements indirectly. FPS is jumpy, 45 in average. Right hand side paint mask onto mask layer, FPS is constant 60.

Comment 5

[Astley Chen (inactive)]

mask-image was enabled on nightly & aurora only, so this issue would be gone when 51 turns to beta. Will not uplift fix in bug 1234485 to 51.