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

From: Werner LEMBERG
Subject: Re: [ft-devel] ttfautohint 0.4 has been released
Date: Sun, 30 Oct 2011 08:31:34 +0100 (CET)

> 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
>  511
>  4

:-)  This fails, of course.

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

Very interesting!  Among other things, ttfautohint's `prep' table is
used to set up some elements of the storage area.  Maybe Apple's
interpreter resets this area while rendering a new glyph?
Unfortunately, the TTF reference manual of Apple says nothing about
the scope of storage area elements.

I'll send you a patch which uses elements from the cvt only.


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