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Re: [ft-devel] Hinting paths

From: Nikolaus Waxweiler
Subject: Re: [ft-devel] Hinting paths
Date: Sun, 1 Nov 2015 11:39:01 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

Alright, will also ask fontconfig people.

Native TrueType hinting with explicitly disabling X-fitting is not
supported (yet) by FreeType.  If you activate Infinality's subpixel
hinting, however, you sort-of get this because most hinting
instructions along the horizontal axis are not executed.  However, a
font *can* circumvent this limitation by activating `native ClearType
hinting' (selector index 3 of the INSTCTRL instruction; this works
since FreeType version 2.6).  In this mode, there are no
backwards-compatibility restrictions, and you can happily emit
horizontal hints in ClearType.

Ah, so native ClearType hinting works now, just not backwards-compatible ClearType hinting for older fonts? And the latter is needed to fully handle ClearType?

What do you mean with `stronger X-and-Y-fitting'?  FreeType's
auto-hinter only supports two modes: `normal' and `light'.

I found rendering differences between autohint on and hintmedium/full that were different from autohint off and hintmedium/full.

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