731113 - border-radius rendering bug with box-shadow or hover colour change

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[nemo]

This might be a dupe, but dolske thought it was worth reporting.

The lower-right corner, where the box-shadow is, has an unattractive line of grey pixels, as if it is being blended against the page, and not the shadow.

Comment 1

[nemo]

Attachment: demo of problem

Comment 2

[Justin Dolske [:Dolske]]

Attachment: Screenshot

Weird. Wonder if this is a recent regression, or we've just never noticed this before.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Almost certainly an antialiasing artifact.

Comment 4

[Timothy Nikkel (:tnikkel)]

We've had bugs like this filed before.

Comment 5

[[:Aleksej]]

Bug 538383, which the comments say to be a duplicate of bug 527695.

Comment 6

[nemo]

So. Something I just noticed and figured I'd bring up.
http://m8y.org/tmp/testcase128.xhtml is an examination of font rendering on 3 computers from a few years ago.
I just noticed that the linux screenshot does not have the bug.

But, if I load http://ljouanneau.com/lab/css3/font_shadow_radius/font_shadow_radius.html in Linux now (on the same computer)
the bug is there again.

So. Rendering layer specific I suppose.

Comment 7

[nemo]

Updated title since it also occurs on http://m8y.org/tmp/testcase383.xhtml  (set background color on page to white to make it more obvious)
In this case, if you hover over the button, the border-color shifts to white.  The antialiasing on the border is not changed.
Cross-platform, all Firefox versions, Firefox only impacted, other browsers seem fine.

Comment 8

[Gregory Pappas [:gregp]]

Attachment: Comparison.png

Comment 9

[Gregory Pappas [:gregp]]

Looks like this still reproduces

Comment 10

[fredhno]

This is still a problem