875184 - visible border around transparent pngs in ubuntu 12.10 (but not other OSs)

Status: UNCONFIRMED

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[Steve]

Attachment: Screenshot from 2013-05-21 18:22:51.png

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:21.0) Gecko/20100101 Firefox/21.0 (Beta/Release)
Build ID: 20130512194354

Steps to reproduce:

I'm testing a new version of craftyjs, a javascript game engine. I opened this example game:

http://sjbyrnes.com/crafty/test/demos/fruitassassin/fruitassassin.htm


Actual results:

There are square white (or gray) 1-pixel frames around the sprites (see attached image). (FYI, the sprites are png images cut out using css from a larger png image with transparent background. No canvas is involved.)


Expected results:

There should not be any visible frames.

Additional info:

I can reproduce this behavior 100% of the time on my computer running ubuntu 12.10, firefox 21.0+build2-0ubuntu0.12.10.2 ... including in a brand-new fresh profile in safe mode. On the other hand, I opened the page in firefox 21 in windows and ubuntu 13.04, and could NOT reproduce the bug. Someone else reports that they also could not reproduce the bug on firefox 21 on a mac. Also, the bug goes away with zooming either in or out (Ctrl-+ or Ctrl-minus), but changing the overall screen resolution does not make any difference.

Of course it's possible that there is a bug in craftyjs ... but the fact that it is OS-specific suggests that the javascript code is OK and it's something about firefox. But I don't really know. Any ideas? And can anyone else reproduce it? Thanks in advance!

Comment 1

[[:Aleksej]]

I guess it is specific to a version of a system library, or a video driver.

Seemingly similar reports found with "png transparent" are in Firefox::ImageLib,  Core::Layout: Images and Firefox::General.

Comment 2

[Steve]

OK. Please let me know if there's anything I can do to help narrow down the cause, and also whether I should file a bug with ubuntu bug center. (I did briefly search mozilla-bugzilla for png transparency bugs but I couldn't find an obvious match.)