1730710 - Scale animations on out-of-process iframes are slow

Status: VERIFIED FIXED

(Core :: Graphics: WebRender, defect)

Comment 1

[Alex Thayer [:alexical] (she/her)]

Attachment: test.html

Attaching a file which demos the issue. However, you need to have fission enabled, then open it as a file, but also have an http server serving its directory (to get it into a separate process). I.e., run python -m SimpleHTTPServer 8000 in Downloads or wherever it is, then just open it in your browser as a file:// URL.

Comment 2

[Alex Thayer [:alexical] (she/her)]

Attachment: Bug 1730710 - Propagate raster spaces in GPU process r?gw

This actually does two things. One: it lets child stacking contexts inherit out
of process raster spaces by checking the parent stacking context's raster space
inside WR itself, and Two: it mirrors the logic in get_raster_space_for_prim
which undoes the device_pixel_scale for pinch zooms in order to get a
consistent glyph rasterization scale. This second thing won't affect the test
page linked in the bug, but it will affect the performance of, say, animating a
whole browser's scale, which is useful for reasons.

Comment 3

[Chris Peterson [:cpeterson]]

Setting status-firefox93=wontfix. I assume we don't need to uplift this fix to Beta 93 because Fission is disabled by default in 93.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/2c675190a51a
Propagate raster spaces in GPU process r=gw

Comment 5

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/2c675190a51a

Comment 6

[Ciprian Georgiu, Desktop QA]

I've reproduced this bug using test.html file from comment 1, on macOS 11.

The issue is verified as fixed on latest Beta 94.0b6, under macOS 11 and Win 10 x64.