See the PNG in the URL. That's xmms' "Simple Spectrum Analyzer" plugin under xcompmgr. Note the offset on both axes. This happens under all four xcompmgr modes so it's most likely a server bug. The offset is 100 pixels in the Y direction and 5 in the X direction. Note the wrapping occurs for both axes, though the screenshot only shows it for the X axis.
I can confirm this on PowerPC/Radeon. Here the offsets exactly match the height and width of the enlightenment16 window decorations. I traced and played around with some index in the code path but did not found yes a location where indeces get used/computerd(?) incoccetly ... :-(
Reported fixed with fix to bug #1101. Thanks!
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.