Bug 472833 - Oxygen style mishandles background transparency
Oxygen style mishandles background transparency
Product: Fedora
Classification: Fedora
Component: kdebase-runtime (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Ngo Than
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2008-11-24 17:38 EST by Craig Scott
Modified: 2009-09-12 18:50 EDT (History)
8 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2009-09-12 18:50:06 EDT
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Regression: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Sample code to show the bug (684 bytes, application/octet-stream)
2008-11-24 17:38 EST, Craig Scott
no flags Details
Screen shot of the incorrectly rendered result (10.04 KB, image/png)
2008-11-24 17:39 EST, Craig Scott
no flags Details

External Trackers
Tracker ID Priority Status Summary Last Updated
KDE Software Compilation 207216 None None None Never

  None (edit)
Description Craig Scott 2008-11-24 17:38:06 EST
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 17:39:00 EST
Created attachment 324547 [details]
Screen shot of the incorrectly rendered result
Comment 2 Bug Zapper 2009-06-09 23:21:35 EDT
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Approximately 30 (thirty) days from now Fedora will stop maintaining
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bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
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Comment 3 Kevin Kofler 2009-06-10 01:52:46 EDT
Does this still happen with Qt 4.5.x and current KDE?
Comment 4 Craig Scott 2009-06-10 02:01:07 EDT
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 02:25:55 EDT
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 09:04:51 EDT
Is this still an issue with 4.3?

Steven M. Parrish - KDE Triage Master
                  - PackageKit Triager
Fedora Bugzappers volunteer triage team
Comment 7 Craig Scott 2009-09-08 19:46:38 EDT
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 Ngo Than 2009-09-11 11:40:19 EDT
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 18:50:06 EDT
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

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