Product: Fedora https://bugzilla.redhat.com/show_bug.cgi?id=891457
--- Comment #20 from Hin-Tak Leung htl10@users.sourceforge.net --- (In reply to comment #18) ...
It is hard to see how cairo could cause this sort of output. It looks more like a FreeType bug. I'm not sure how to debug this any further without writing some FreeType test code to check the output from FreeType. And that is something I don't have time to do.
Werner suggested trying to reproduce similar problems if possible with ftview, which can do font effects on display. But I am not hopeful in that since it looks like the problem does not affect bitmap-based output.
Note: the png output from the testcase is using the glyph bitmaps generated by FreeType while the PDF/PS output is using the outlines from FreeType.
I haven't figured out where/how cairo write fonts yet...