[Bug 356393] [NEW] scale plugin is buggy with transparency

[Bogdan Butnaru]

Public bug reported:

Binary package hint: compiz

Hello! I'm running up-to-date Jaunty on a machine with a GeForce 9600 GT
video card. I'm currently using nvidia-glx-180 version 180.44-0ubuntu1,
however the problem described below has been occurring for a while.

The scale plugin behaves strangely when transparency is involved. When I
activate it, first everything is displayed correctly. Then the parts
that are transparent (either because of windows' alpha channels or
because of the scale plugin's opacity setting) become less so, in steps
about a second apart. It looks a bit of it the transparent parts are
redrawn without erasing their old images (thus the transparency is
effectively reduced each step).

There are some delays between the effect of this on different windows,
but less than the “step” delay. I'll attach below two screenshots
showing the difference.

In addition to this, other operations, e.g. moving the mouse to focus
different windows while in the scaled mode, cause a kind of “flickering”
of the windows, as if they switch between different transparencies and
can't decide. In all cases, if I leave the scale mode active for a few
seconds without any activity all windows will become opaque.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

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scale plugin is buggy with transparency
https://bugs.launchpad.net/bugs/356393
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