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

[vern adams]

Werner,

Not sure if this helps but it looks like it may!!

I was playing in Fontforge with the prep table of a thin weight ttfautohinted 
font, trying to prevent pixel 'drop out'.
At one point  i simply replaced the whole prep table with 

PUSHW_1
 511
SCANCTRL
PUSHB_1
 4
SCANTYPE

The result (on Win XP greyscale and Cleartype) looked a LOT like the shredded 
rendering on iOS!


MS Greyscale = 
https://lh6.googleusercontent.com/-YZlQfUB1PjU/Tqztfo8XFJI/AAAAAAAABHw/qrT-G4mkTPI/s745/Screen%252520shot%2525202011-10-30%252520at%25252006.23.26.png
MS Cleartype = 
https://lh6.googleusercontent.com/-qQZH_Phhfi0/Tqzr-04GT1I/AAAAAAAABHo/1ATMNSXPmf0/s753/Screen%252520shot%2525202011-10-30%252520at%25252006.15.42.png

The shredding looks very much like under iOS. Could it be that Apple's render 
engine on iOS doesn't like something in the prep tables of ttfautohinted fonts ?
Maybe the instructions are fine, but the prep table is causing the issue? 
Something missing perhaps?

-v



On 28 Oct 2011, at 13:19, Werner LEMBERG wrote:

> 
>> Please see http://newtypography.co.uk/ttfautohint/
>> These are 4 forms that are guaranteed to get shredded :)
> 
> Thanks!
> 
> 
>    Werner