506066 - Animated gif on mouseover doesnt animated correctly

Status: RESOLVED INVALID

(Core :: Graphics, defect)

Description

[Mark Ellis]

User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv:1.9.1) Gecko/20090705 Gentoo Firefox/3.5
Build Identifier: Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv:1.9.1) Gecko/20090705 Gentoo Firefox/3.5

Animated gif on mouseover doesn't animated correctly.

See here, http://thisaintnews.com/viewblog/317/#comment41080

Mouse over the image, it only animates the top left 1/4 of the image, rather than the whole thing.

Here is the original image for comparison, http://www.thedigitalsite.co.uk/forum/files/crazy_fireworks1.gif

This is only affecting FF, and works as expected in IE/Chrome/Safari etc. The javascript code involved is mootools, I've chatted with them on irc, and they believe it to be a FF bug, so here I am!

This has been reported by several users, including myself, all using FF, multiple OS's and FF versions.

The JS code involved is here, http://pastebin.com/f2a9cd421

Reproducible: Always

Steps to Reproduce:
1. Go to http://thisaintnews.com/viewblog/317/#comment41080
2. mouseover image
3. compare to http://www.thedigitalsite.co.uk/forum/files/crazy_fireworks1.gif
Actual Results:  
Only top left 1/4 of image animates

Expected Results:  
All of image to animate

Comment 1

[Ria Klaassen (not reading all bugmail)]

Confirmed with Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2a1pre) Gecko/20090723 Minefield/3.6a1pre

Comment 2

[Joe Drew (not getting mail)]

I don't see "top left 1/4" of the image animating (OS X, latest trunk nightly), but I do see some odd not-finished-decoding frame artifacts. This might be fixed by magic by Bobby Holley's decode-on-draw patch, but otherwise, we'll need to look at this at some later time.

Comment 3

[Mark Ellis]

still not fixed in Firefox 3.6. :(

Comment 4

[Joe Drew (not getting mail)]

In fact, still applies to trunk, just as it was described originally.

Comment 5

[Mark Ellis]

I did some digging, and it seems to be only broken when the image has a fixed height/width. I've also simplified the html/js a lot and uploaded those, hope it helps

Comment 6

[Mark Ellis]

Attachment: Broken mouse over

Comment 7

[Mark Ellis]

Attachment: Works(ish) mouseover

Comment 8

[Mark Ellis]

this works now, has for several versions. sorry forgot to close it sooner, and thanks