[ubuntu-mono] [Bug 403135] Re: Notification area icon wrongly rendered/uses bg_color as a background (multiple apps)

[Rémi Denis-Courmont]

How to make the tray icon transparent depends on the theme. If the tray
icon area uses a uniform background color, then the tray icon background
can simply be filled with the same color. That is what happens with
"old" desktop themes, and works in pretty much any application.

However, if the tray icon area background is _not_ uniform, then
composition is required, so that the icons are really transparent. To
that end, applications must create an X window for they tray icon, that
uses the ARGB X11 visual. Unfortunately, some applications hence fail to
do that. Instead, they use the old method and fill the background of
their tray icon with an uniform background color.

I know at least VLC and Skype fall in this category. In both cases, ARGB
visuals are disabled due to complications with video rendering, namely
the XVideo extension cannot be used with ARGB visuals. In principle,
this is not an issue: XVideo is used for the main application video
rendering window, not for the tray icon window. X11 allows an
application to use different visuals for different windows. However, to
my knowledge, the Qt4 GUI library does not expose this feature of X11,
and hence ARGB has to be disabled not just for the video widget, but for
all widgets including the tray icon.

-- 
Notification area icon wrongly rendered/uses bg_color as a background (multiple apps)
https://bugs.launchpad.net/bugs/403135
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Status in AllTray: Fix Released
Status in aMSN: Confirmed
Status in AMule: New
Status in Banshee Music Player: Confirmed
Status in Beagle Desktop Search: Confirmed
Status in a fast and powerful GTK+ based mail client: Unknown
Status in Desktop Drapes wallpaper managment.: Fix Released
Status in FileZilla FTP Client: Confirmed
Status in firestarter: New
Status in gmusicbrowser with now-playing support: New
Status in Mail Notification: Confirmed
Status in Pidgin: Fix Released
Status in Quod Libet is a GTK+-based audio player written in Python.: New
Status in VLC media player: Won't Fix
Status in Wine: Confirmed
Status in wxWidgets crossplatform GUI toolkit: New
Status in Ubuntu: New
Status in “alltray” package in Ubuntu: Confirmed
Status in “amsn” package in Ubuntu: Confirmed
Status in “azureus” package in Ubuntu: Fix Released
Status in “banshee” package in Ubuntu: Triaged
Status in “checkgmail” package in Ubuntu: New
Status in “claws-mail” package in Ubuntu: Confirmed
Status in “filezilla” package in Ubuntu: New
Status in “gajim” package in Ubuntu: New
Status in “gnome-panel” package in Ubuntu: Invalid
Status in “gxneur” package in Ubuntu: Confirmed
Status in “openoffice.org” package in Ubuntu: Confirmed
Status in “pidgin” package in Ubuntu: Fix Released
Status in “vlc” package in Ubuntu: Won't Fix
Status in “wine” package in Ubuntu: Won't Fix
Status in “wine1.2” package in Ubuntu: Triaged

Bug description:
The following bug may possibly depend on my setup, if so just tell me how to check this. I am using banshee 1.4.3-5 (in ubuntu karmic) and its notification area icon has a black background, unlike other applets that have a transparent background.

I attach a screenshot.

This bug is noticed when:
a) Themes set a background image in the gtkrc
b) If users set a custom image for the panel from Panel Properties > Background > Background Image

***This bug affects all themes , but has become easier to notice since the default light-themes use a background image.***

Also , see , comment #99 , might be a regression in gnome-panel since Karmic release.