[cairo-bugs] [Bug 31897] _composite_glyphs: Assertion `! (((this_x+4096) | (this_y+4096)) & ~0x3fffu)' failed.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31897

--- Comment #5 from Uli Schlachter <psychon at znc.in> 2010-11-24 10:22:34 PST ---
Created an attachment (id=40551)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40551)
Test (ugly) case that (hopefuly) does the same thing wireshark does

My cairo clone was outdated, sorry for that.
I can reproduce this problem with the provided pcap trace, thanks a lot.

Wireshark allocates a 15124x100 surface which is large enough to hit this
problem and then draws text to it.
The Xlib backend handles this case by doing a fallback instead of assert().

Just removing the assert() doesn't seem to cause any integer overflows (xtrace
output looks good), but I bet there are cases out there which manage to hit the
overflow.

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