http://bugs.winehq.org/show_bug.cgi?id=16412
--- Comment #12 from Stefan Dösinger stefandoesinger@gmx.at 2008-12-09 13:08:50 --- The "Unknown source argument 255" fixme's are related to the patch as well, although they are not the fault of the patch. The patch uncovered a bug in the rest of the code, where 0xffffffff is used instead of ARG_UNUSED. Since the size of the color/alpha op members in the ffp desc structure was changed this difference surfaced.
The problem is harmless, the FIXME is all the harm it does. I'll send a patch that fixes it.