WVisualWaveform #2 becomes corrupted after coming out of full screen mode

[ironstorm]

System: Core2, Kubuntu Gutsy, Nvidia Proprietary 169 Drivers, Compiz-Fusion and Emerald (Compiz window decorator)

1. Open Mixxx
2. Hit Escape to open full screen mode
3. Hit Escape to leave full screen mode

The Deck B WVisualWaveform widget becomes corrupt and 10% at the top of the screen becomes corrupted (it shows movement matching playback on Deck B)

Exit mixxx the video corruption disappears.

See attached screenshot

[ironstorm (ironstorm-gmail)]

This behavior is not observable on an eeePC running Xandros with an Intel i810 video chipset and no compiz.

[Albert Santoni (gamegod)]

On OS X, when you go into fullscreen and come back you also see the WVisualWaveform widget get corrupted, as per my screenshot.

At this point, I'm in favour of putting all effort into rewriting WVisualWaveform from scratch.

[Wesley Stessens (wesley)]

I agree with asantoni
the visual waveforms are causing a lot of weird issues that are very hard to track down and solve
I think it's better to start from scratch... we should write our ideas for this thing on a wikipage probably..
anyone wants to start?

[ironstorm (ironstorm-gmail)]

FYI, I noticed this also happens if I "window-shade" mixxx (i.e. double click on the taskbar to roll up the app window)

[ironstorm (ironstorm-gmail)]

This will be fixed in trunk when rryan's GSoC code merges sometime after 1.6.0... :D

[RJ Skerry-Ryan (rryan)]

Can you see if you can reproduce this now that the new waveform code has been merged into trunk? The bug might not be fixed by the re-write because it could have to do with how we use QGLWidget. (which is roughly the same)

[ironstorm (ironstorm-gmail)]

Reproducible with trunk by minimizing and restoring in Compiz-Fusion.
Window-shading also produces the problem (rolling up window into title-bar).

Full screen / restore does not cause it though.

[ironstorm (ironstorm-gmail)]

Occurs even if you don't load any tracks.

Does NOT occur with SIMPLE waveform (minimize, shade, fullscreen = all okay in simple waveform).

[RJ Skerry-Ryan (rryan)]

I asked in #qt and they said that many apps are reporting corruption with QGLWidgets related to Compiz. The interesting part is that it only seems to occur on waveform 2, which gets its GL context from waveform 1. We can try disabling context sharing and see if that fixes the problem.

[RJ Skerry-Ryan (rryan)]

In Bug #338353 I disabled context sharing. ironstorm : do you still have the machine that had this problem? Are you able to reproduce this?

[Daniel Schürmann (daschuer)]

This on is incomplete for long, I close it now.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issue/4928

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/4928