Bug 472833

Summary: Oxygen style mishandles background transparency
Product: [Fedora] Fedora Reporter: Craig Scott <audiofanatic>
Component: kdebase-runtimeAssignee: Than Ngo <than>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 11CC: fedora, jreznik, kevin, lorenzo, ltinkl, rdieter, smparrish, than
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2009-09-12 22:50:06 UTC Type: ---
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Description Flags
Sample code to show the bug
none
Screen shot of the incorrectly rendered result none

Description Craig Scott 2008-11-24 22:38:06 UTC
Created attachment 324546 [details]
Sample code to show the bug

Description of problem:
When the Oxygen style is being used, transparent backgrounds for widgets are not handled correctly. Undesirable artefacts are shown and transparency is not always enforced. Sample code is attached and I'll also attach a screen shot shortly. Using any other style works as expected, so the problem seems to be restricted to the Oxygen style. I have had correspondence with Nokia on this issue and we agree that the Oxygen style appears to be the cause.

Version-Release number of selected component (if applicable):
The bug only shows up for Qt4.4.1 and later. When using Qt4.4.0 the bug does not seem to show up.

How reproducible:
See attached code sample and screen shot.

Actual/expected results:
The sample code should show a light green box with QLabel text drawn over it. The bug instead causes a dark green box to be drawn partly over the light green box and the label never appears. Other manifestations of the bug show a black box instead, but the general behavior seems to be that a darker box seems to cover approximately the upper half of the widget and transparency is mishandled.

Comment 1 Craig Scott 2008-11-24 22:39:00 UTC
Created attachment 324547 [details]
Screen shot of the incorrectly rendered result

Comment 2 Bug Zapper 2009-06-10 03:21:35 UTC
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Comment 3 Kevin Kofler 2009-06-10 05:52:46 UTC
Does this still happen with Qt 4.5.x and current KDE?

Comment 4 Craig Scott 2009-06-10 06:01:07 UTC
Yep, the sample attachment still shows the bug with current Qt (4.5.0) and KDE (4.2.3).

Comment 5 Kevin Kofler 2009-06-10 06:25:55 UTC
Well, let's rebase to F11 then (not Rawhide because that one has 4.3, so maybe it's fixed there already... we can always hope ;-) ).

Comment 6 Steven M. Parrish 2009-09-08 13:04:51 UTC
Is this still an issue with 4.3?

-- 
Steven M. Parrish - KDE Triage Master
                  - PackageKit Triager
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers

Comment 7 Craig Scott 2009-09-08 23:46:38 UTC
Don't know, I don't have access to a system running KDE 4.3 and probably won't for at least a few weeks.

Comment 8 Than Ngo 2009-09-11 15:40:19 UTC
it's still effacted in 4.3.1. It's great if someone could report this to KDE upstream (component: kstyle). thanks

Comment 9 Steven M. Parrish 2009-09-12 22:50:06 UTC
Ok reported upstream. Going to close this report in favor of the upstream one.

-- 
Steven M. Parrish - KDE Triage Master
                  - PackageKit Triager
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers