187825 - Image with src update doesn't get updated

Status: RESOLVED INCOMPLETE

(Core :: Graphics: ImageLib, defect)

Description

[Neil Marshall]

I have a web cam which updates the image every time the image is reloaded
(http://www.stratoware.com/webcam2000/).  I tried to setup a timer on the web
page to reload the image every n seconds as I don't want the web page itself to
keep reloading.

If the filename in the .src changes, then the image updates as it should. 
However, if the filename doesn't change in any way, the image doesn't update.

This even happens if I set <meta http-equiv="pragma" content="no-cache"> in the
html (moz 1.3a release).  It works as I would like it to in IE 6.

Comment 1

[Neil Marshall]

Attachment: Testcase

Comment 2

[Neil Marshall]

Oh, one more thing.  If you open the testcase in 2 tabs at the same time, it
will start to work.

Comment 3

[Boris Zbarsky [:bzbarsky]]

we optimize away changes to the DOM that would change nothing (in this case
setting "image.src = image.src").  You may want to set .src = ""; then
.src="whatever"....

Comment 4

[Neil Marshall]

I already tried that.  It doesn't work.  The image doesn't do anything until I
replace it with another valid image.

Comment 5

[Boris Zbarsky [:bzbarsky]]

hm... then it's more likely an imagelib bug than a DOM bug.

Comment 6

[Neil Marshall]

The example isn't working anymore because the port with the image changed, so
I've put up a url to my camera which shows the problem.

I'd just like to find a workaround if possible.

Comment 7

[Christian :Biesinger (don't email me, ping me on IRC)]

*** Bug 195510 has been marked as a duplicate of this bug. ***

Comment 8

[Jeffrey Friedl]

Neil, if you add a changing ?number to the end of the url, e.g. with

  image.src = url + "?" + count++;

it should work, if the program serving the image knows to ignore what follows
the question mark (as most servers should).  It's a kluge, but it could
be the workaround you were looking for.

Comment 9

[Neil Marshall]

It worked, thanks!

Comment 10

[Neil Marshall]

Now that the version with the workaround is up at
http://www.eightlines.com/neil/webcam/
I've placed a simplified version here
http://www.eightlines.com/neil/webcam/mozbug.html

Comment 11

[Johnny Stenback (:jst)]

Mass-reassigning bugs to [e-mail]

Comment 12

[Boris Zbarsky [:bzbarsky]]

Is this still an issue?  I suspect the problem may actually be in the guts of
libpr0n....

Comment 13

[Mats Palmgren (inactive)]

*** Bug 211393 has been marked as a duplicate of this bug. ***

Comment 14

[Mats Palmgren (inactive)]

Yes, this still occurs.  Seems ImageLib/Cache related...

Comment 15

[Christian :Biesinger (don't email me, ping me on IRC)]

the issue here is basically the same as in
http://bugzilla.mozilla.org/show_bug.cgi?id=202274#c8 (though the (ugly) patch
there would not fix this bug)

Comment 16

[Benoit Jacob [:bjacob] (mostly away)]

Last input in 2003. better treat as incomplete.