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Re: [ft-devel] otvalid modules

From: Behdad Esfahbod
Subject: Re: [ft-devel] otvalid modules
Date: Tue, 07 Aug 2007 18:35:00 -0400

On Tue, 2007-08-07 at 18:06 -0400, George Williams wrote:
> I am working on a validator for the MATH table to slot it in to otvalid.

Hi George,

Any spec on the MATH table available online?



> I noticed that if the version number of the GDEF table is unknown it
> raises FT_INVALID_FORMAT, but if the version number of GSUB is unknown
> FT_INVALID_DATA is raised. Does this matter? I wasn't sure which to
> raise for the math table.
> I did not wish to change the API, but the OT validator currently has
> arguments in which all the other tables are returned. The result is that
> MATH is a second class citizen -- it gets validated, but not returned.
> This has been tested on a total of one font, because I've only got one
> font. It was also tested on FontForge's output on an additional 2 fonts,
> but I'm not sure that means anything (Since I wrote both I might have
> made the same mistakes both places -- I did take pains not to refer to
> my previous work when writing this, however).
> It tarball contains:
>    1) A patch to ftvalid in ft2demos
>    2) A patch to include/freetype
>    3) A patch to src/otvalid
>    4) otvmath.c which should go into src/otvalid
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