I have an old font called `Agenda-MediumItalic.ttf' (probably from
1993) which has very strange `hhea' entries:
<ascent value="0"/>
<descent value="0"/>
<lineGap value="0"/>
Additionally, it has an `OS/2' table, version 0 -- something which
Windows doesn't accept IIRC -- so it seems that this font is from/for
the Mac. On the other hand, it has valid entries in `OS/2':
<sTypoAscender value="712"/>
<sTypoDescender value="-231"/>
<sTypoLineGap value="71"/>
<usWinAscent value="930"/>
<usWinDescent value="238"/>
Currently, FreeType only uses the `hhea' table entries to compute the
`ascender', `descender', and `height' fields in `FT_Face' which means
that you get unusable values for this font. What do you think about
providing a fall-back, say:
if ascent == 0 && descent == 0
use sTypoAscender and sTypoDescender
endif
if lineGap == 0
use TypoLineGap
endif
Do you have a better idea? Shall I take care of this situation at
all?
Werner
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