279242 - Transparency not handled correctly when setting wallpaper

Status: RESOLVED EXPIRED

(Firefox :: Shell Integration, defect)

Description

[Damien Guard]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8a6) Gecko/20050104 Firefox/1.0+ (bangbang023)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8a6) Gecko/20050104 Firefox/1.0+

When setting a desktop wallpaper from an image with transparency all transparent
areas are filled in black.

While Windows BMP does not support black it should instead fill these areas with
the "desktop colour" selection that is present on the "Save as wallpaper" dialog.

Reproducible: Always

Steps to Reproduce:
1. Go to http://www.factorycity.net/mozilla/firefox-rgb.png
2. Right-click and choose "Set as wallpaper"
3. Choose a non-black desktop colour

Actual Results:  
The desktop is set with the correct colour and image but the image has an ugly
black area where the transparency was.

Expected Results:  
Use the chosen background colour from the "Save as wallpaper" dialog instead of
using black.

Comment 1

[Matthew Imakyure]

The problem is with how Windows renders the png image.  I believe that Internet
Explorer still does not fully support png transparency.  In this case, the
solution I would use would be to edit the image so that transparency is not
needed and save as bmp (so Active Desktop is not needed) and set that image as
wallpaper.

Comment 2

[Damien Guard]

(In reply to comment #1)
> The problem is with how Windows renders the png image.  I believe that Internet

No, Firefox is creating a BMP file for Windows, specifically
"%SYSTEMROOT%\Firefox  Wallpaper.bmp".

It therefore has nothing to do with how Windows handles PNG.

[)amien

Comment 3

[Jasper Lieber]

possibly related to 201198???

Comment 4

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
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you still believe we should implement it, please visit the URL of this bug
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If it is not a problem any longer, you need take no action. If this bug is not
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Comment 5

[Gervase Markham [:gerv]]

This bug has been automatically resolved after a period of inactivity (see above
comment). If anyone thinks this is incorrect, they should feel free to reopen it.