441338 - GIF images with transparency rendered with transparent pixels shifted down

Status: RESOLVED INCOMPLETE

(Firefox :: General, defect)

Description

[Brett Fattori]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0

When rendering GIF images with transparency, the transparent pixels are shifted into the wrong place.  The image is designed to repeat along the X axis, but not the Y axis.  However, to get the image to display properly, I have had to enable repeat on BOTH axis, and move the background position by 9 pixels to fix the display.

Reproducible: Always

Steps to Reproduce:
1. Check out the attached file which contains a simple example of the problem with included HTML, CSS, and imagery.

Actual Results:  
The GIF image renders improperly with the transparent pixels shifted down by 9 pixels.

Expected Results:  
The transparent pixels should render at the top of the GIF image.

Comment 1

[Brett Fattori]

Attachment: HTML, CSS, and imagery to reproduce the bug.

Open the file "gifbug.html" in Firefox 3 and see the incorrect results at the top with a workaround below.  This did not occur in Firefox prior to version 3.0

Comment 2

[Martijn Wargers (dead)]

Brett, is there a chance you could make a simpler testcase, with more of the styling removed?

Comment 3

[Brett Fattori]

I don't know how much more of the styling I can remove.  I really tried to scale back the amount of styling needed.  Even when I remove all styles (except for the background url) from ".component-tabbedpane-middle-inactive" I still get the strange offset problem.

This issue still exists today.

Comment 4

[Tyler Downer [He/Him]]

This is a mass search for Firefox General bugs filed against version 3.0 that are UNCO and have not been changed for 200 days.

Reporter, please update to Firefox 3.6.10 or alter. Firefox 3.0 is no longer supported and is no longer receiving updates. After you update, please create a fresh profile, http://support.mozilla.com/kb/managing+profiles, and test to see if your bug still exists. If you still the bug, then please post a comment with the version you tested against, and the problem. If the issue is no longer there, please set the RESOLUTION to  RESOLVED, WORKSFORME.

Comment 5

[Tyler Downer [He/Him]]

No reply from reporter, INCOMPLETE. Please retest with Firefox 3.6.12 or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.