[ft-devel] State of autohinter stem darkening

[Nikolaus Waxweiler]

Hi list,
I'm using my autohinter stem darkening patches daily and so far only 
have stumbled over a minor rendering difference and one major fault: 
DroidSansFallback.ttf renders excessively bold after 
FT_Outline_EmboldenXY treatment, meaning, the same emboldening values 
lead to a much stronger emboldening compared to the same values for 
other fonts. I noticed that the font is constructed with 256 units per 
EM. I don't know why this happens. Using ftview to open the font and 
pressing "2" to go to the emboldening view, the font renders similarly 
to other fonts in that mode. It's just when I do it inside the 
autohinter that emboldening is excessive. Is there any special 
processing in the autohinter that I'm overlooking?

After this is resolved, the code should be ripe for a review :)

https://github.com/madig/freetype2/tree/stem-darkening-autohinter