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Re: [ft-devel] [ft] ttfautohint 0.4 has been released

From: Infinality
Subject: Re: [ft-devel] [ft] ttfautohint 0.4 has been released
Date: Sat, 29 Oct 2011 14:16:06 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1

Hi Vernon,

I've achieved some results by selectively playing with the "dist" value in af_latin_compute_stem_width() in aflatin.c. The problem with doing this though is the lack of diagonal hinting in the autohinter. Things like W and A can start looking really thin when you force stems to something like 1 pixel wide. I would LOVE to see diagonal hinting get implemented, because it would really improve the quality of the autohinter. I'd also be interested to see if there is some sort of official answer to your question, as I'd certainly make use of it in my patchset. Currently I use a combination of emboldening, gamma correction, alignment and "dist" manipulation to make thinner fonts render in a more readable way. It would be nice to have one way to do it!


On 10/27/2011 11:05 AM, vern adams wrote:
Thanks Werner.
I will test this tonight :)

Also - i have noticed ttfautohint has limitations when it comes to instructing 
very light weighted fonts.
The autohinter is creating instructions that produce much too thin stems. The 
uniformity of the stems seems good :) but they are simply too thin and 
disappear at below 18-16 px.
Could there be a way to set the autohinter to impose a minimum size of stem 
widths, for example??

I will post you screenshots later of the issue.


On 27 Oct 2011, at 16:52, Werner LEMBERG wrote:

ttfautohint 0.4 has been released.  If you have had rendering problems
on Apple computers, please try this version.  Theoretically, those
issues should no longer be there.

It is available from




PS: Downloads from will redirect to your nearest
    mirror site.  Files on mirrors may be subject to a replication
    delay of up to 24 hours.  In case of problems use


This project provides a library which takes a TrueType font as the input,
remove its bytecode instructions (if any), and return a new font where all
glyphs are bytecode hinted using the information given by FreeType's
autohinting module.  The idea is to provide the excellent quality of the
autohinter on platforms which don't use FreeType.

The library has a single API function, `TTF_autohint'; see
`src/ttfautohint.h' for a detailed description.  Note that the library
itself won't get installed currently.

A simple command-line interface to the library is the demo program
`ttfautohint'; after compilation and installation, say

  ttfautohint --help

for usage information, or say

  man ttfautohint

to read its manual page.


New in 0.4:

* The bytecode has been changed to `create' twilight points.  This should
  avoid rendering artifacts on some platforms.

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