Closed Bug 1600382 Opened 4 years ago Closed 1 year ago

CSS: transform: skew: two very slim white lines

Categories

(Core :: Graphics, defect, P5)

70 Branch
defect

Tracking

()

RESOLVED WORKSFORME

People

(Reporter: r.rudolph, Unassigned)

References

Details

Attachments

(4 files)

Attached file trapezoid.html

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0

Steps to reproduce:

open attachment

Actual results:

two very slim white lines in the trapezoid
(visible when looking at the display from different angle of views)

Expected results:

there should be no slim white lines at all
(in Chromium there are no slim white lines)

Component: Untriaged → Layout
Product: Firefox → Core

I don't see slim white lines, so this is probably a graphics issue.

Can you attach your about:support?

Component: Layout → Graphics
Flags: needinfo?(r.rudolph)
Attached file about_support.txt

see the asked attachment:
about_support.txt

Flags: needinfo?(r.rudolph)

answer to Emilio Cobos Álvarez:
indeed, on a tablet in Firefox, I also can't see the two slim lines

this is a screenshot of the computer, so you can see the two slim white lines inside the trapezoid; both white lines are going from left to the right

side by side comparison:
left: Firefox: two slim white lines inside the trapezoid
right: Chromium: no white lines inside the trapezoid

Looks like slim black lines to me? I see it on the left though.
jrmuizel: Do you know who to route this to? Basic layers, css transform artifact?

Flags: needinfo?(jmuizelaar)
Priority: -- → P3

It looks like this happens with Basic layers and not WebRender. It's likely a somewhat fundamental artifact caused by how we draw borders interacting with 3d transforms.

Since we don't plan on supporting this path in the long term we're unlikely to fix this before we get WebRender everywhere. If you want to try out WebRender now you can by setting gfx.webrender.all=true in about:config

Flags: needinfo?(jmuizelaar)
Priority: P3 → P5
Severity: normal → S3
Status: UNCONFIRMED → RESOLVED
Closed: 1 year ago
Depends on: fixed-by-webrender
Resolution: --- → WORKSFORME
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