369864 - Borders on images rendered inconsistently

Status: RESOLVED DUPLICATE of bug 363220

(Core :: Graphics, defect)

Description

[hhh]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070208 BonEcho/2.0.0.2pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070208 BonEcho/2.0.0.2pre

Image borders at the url are showing inconsistent rendering. Specifically, one side of a 2px border is only being rendered at 1px. Additionally, the image seems shifted to the right by 1px.

Reproducible: Always

Steps to Reproduce:
1.
2.
3.



http://forums.mozillazine.org/viewtopic.php?p=2740544#2740544

Comment 1

[hhh]

Caused by fix of https://bugzilla.mozilla.org/show_bug.cgi?id=177805 ?

Comment 2

[Ryan VanderMeulen [:RyanVM]]

I see a little oddness from before bug 177805 landed, but things definitely look worse afterward. It appears that some of the images are shifted over a bit, leading to a white stripe down one side between the border and the image and a cutting into the border on the other side.

Comment 3

[Ryan VanderMeulen [:RyanVM]]

I'll try to write up a small testcase later on today if nobody else gets to it first.

Comment 4

[Dão Gottwald [:dao]]

> a 2px border is only being rendered at 1px. Additionally, the image
> seems shifted to the right by 1px.

Apparently the border is rendered correctly (at least regarding it's width) but it doesn't align with the image. That's because of margin-left/right:auto. Somehow the rounding is inconsistent.

Comment 5

[Peter van der Woude [:Peter6]]

Attachment: testcase

compare the border of a div with that one of an image

Comment 6

[Dão Gottwald [:dao]]

sorry, that testcase is useless, because of the inner (inset style) border of the image. there's no misrendering.

Comment 7

[Dão Gottwald [:dao]]

Attachment: testcase

Comment 8

[Jonathan Haas]

Notice that the <span/> is rendered incorrectly, too. Maybe the summary should be changed.

Comment 9

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I think this is the same as bug 363220.

Comment 10

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Marking in-testsuite+ since I believe this is covered by the tests in layout/reftests/pixel-rounding/ marked as failing due to bug 363220.

And I'm marking as duplicate rather than dependency.