125629 - PNG with alpha transparency used as background are incorrectly displayed

Status: RESOLVED DUPLICATE of bug 137223

(Core :: Layout, defect, P2)

Description

[Pascal Chevrel:pascalc]

When using a PNG image with alpha transparency as backgroung image for a layer,
this image is incorrectly laid out, it does not fill the whole box. This is a
regression bug since NS6.2.1 displays it flawlessly. 

Reproducible : always
Steps to reproduce :
1 go to http://perso.chevrelbureau.com/bugzilla/png/index.htm
2 compare the two boxes, the one with a PNG background isn't entirely drawn. The
one with a JPEG background is correctly drawn.

Expected result : the PNG image should fill the whole box
Current situation : the PNG image does not fill the whole box, when you hover a
link on the page, there is some redrawing and the PNG images stretches itself a
bit but does not reach the box' borders.

Comment 1

[R.K.Aa.]

same as bug 125484?

Comment 2

[Chris Petersen]

Which build are you using ? I don't see this issue under Feb 15th OS X build
(2002-02-15-08).

Comment 3

[viipale+bugzilla]

I tried it with W2K and Mac OS X. 
Results: works fine in Mac, but not in W2K.

Both are 20020215 build.

Comment 4

[Terri Preston]

These boxes don't appear to be the same on win xp build 2002022703, marking new

Comment 5

[Kevin McCluskey (gone)]

Reassigning to Don.

Comment 6

[Christian 'CeeJay' Jensen]

I can confirm this on build 2002032708 using WinXP
The PNG does not fill the entire box .. it seems to be shifted up and to the left.

There are plenty of other PNG transparency bug (i was researching them to look
for things they had in common when I found this) .. and I think most or all of
them are regressions as I do not remember seeing them in some earlier builds.

This tranparency bug seems slighty different though because the PNG seems
shifted but it could still be the same bug.

Comment 7

[Aaron Kaluszka]

Resize your window to be smaller than the testcase area.. notice how the
unpainted part of the background follows the bottom of the browser window...

Comment 8

[Emmanuel Bourg]

Another example of alpha transparent PNG used as background :

http://www.magelo.com/eq_view_profile.html?num=70474

Both boxes can be moved around by dragging the upper left corner.

Comment 9

[Fabrice Bonny]

It seems that 125581 and 125484 are duplicates. This bug have more votes so
isn't it would be simple to keep this one ?

Comment 10

[Brett Donald]

dupe of bug 123511?

Comment 11

[Aaron Kaluszka]

No!

Comment 12

[James Lariviere]

*** Bug 125581 has been marked as a duplicate of this bug. ***

Comment 13

[dcone (gone)]

Duplicate of 137223.  Patch is posted in that bug.

*** This bug has been marked as a duplicate of 137223 ***