WMF font object: font's familyname, italics flag, and the weight
Other inputs include: a ghostscript-style Fontmap, and up to two XML RedHat-style fontmaps. (These are all parsed earlier.) There are also the fallback 13 standard postscript fonts. And then there is a list of font directories to search for fonts.
libwmf requires fonts to have a postscript name, and maintains an internal cache of glyphs path and freetype font face, keyed to postscript font name. Unfortunately, although the XML fontmaps do have font familyname, the GS fontmap does not. In the latter, therefore, matching WMF font info to postscript font name is hit-and-miss.