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Re: [ft-devel] Regression in 2.3.6


From: Werner LEMBERG
Subject: Re: [ft-devel] Regression in 2.3.6
Date: Tue, 01 Jul 2008 07:31:24 +0200 (CEST)

> > > After upgrade to 2.3.6 version freetype dysplays CMU Concrete
> > > font (http://cm-unicode.sourceforge.net ) with lower height for
> > > some small Latin letters (g, u, dotlessi) than for other ones
> > > (e.g. x, o, etc.) at some sizes (19, 21 ppem).
> >
> > I think this is a bug in the hinting of those glyphs.  IMHO, the
> > topmost horizontal hint of letter `u' (and others like `i' and
> > `j') is too small.  In the attached image it can be clearly seen
> > that the topmost hstem doesn't include the topmost points.
> >
> > If you change the hint height of the topmost hint from 59 to 73
> > font units, the glyph renders perfectly at all sizes.
> 
> I know about it.  But the font was produced in batch regime, so it
> could not be changed easily.  Moreover future versions for CMU fonts
> are unlikely.

So what?  It would be interesting to know how, say, Acrobat handles
this font at that resolution.  Does this application do what you want
FreeType to do?  This would be a reason to think of solutions how to
improve FreeType's hinting algorithm.


    Werner




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