[Devel] pure CFF fonts and advanced widths

[Tom Kacvinsky]

I have been seeing some of th same errors regarding advanced widths in pure CFF
fonts taht Eric Blinn has reported.  I can't seem to track it down, but I here
is what I have found:

If I take a OpenType/CFF font and extract the CFF table, the resulting pure CFF
font does not display properly: all of the glyphs overwrite one another.

If, on the other hand, I use ftview to display the OpenType/CFf font, the glyphs
display properly.

I tend to think that there is more metrics parsing going on for OpenType/CFF
fonts than there is for pure CFF fonts.  A quick scan of the code sort of
enforces this view point.

By the way, the code in t2parse, does not set decoder.builder.advance.x based on
the advanced width given in a charstring.

Tom