On OS X, using the pdf backend, I get the exception "RuntimeError:
TrueType font is missing table" when running examples/fonts_demo_kw.py,
because ttconv is trying to load /System/Library/Fonts/Times.dfont as a
TrueType font, which it of course is not.

A simple solution would be to limit the font searching algorithm to only
look for files matching *.ttf, but that would unnecessarily limit the
Agg-based backends, since freetype does understand and render dfont
files. The best solution would be to implement dfont support in the pdf
backend, but I have no idea how complicated that would be.

What would be a reasonable interim solution? Perhaps the font manager
should identify the file type of each font file it knows about, so e.g.
the pdf backend could request a list of just the TrueType fonts.

(See also:
http://article.gmane.org/gmane.comp.python.matplotlib.general/10069 )

-- 
Jouni K. Seppänen
http://www.iki.fi/jks


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