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Re: [ft-devel] gamma correction and stem darkening

From: Werner LEMBERG
Subject: Re: [ft-devel] gamma correction and stem darkening
Date: Sun, 17 Jan 2016 06:58:50 +0100 (CET)

> Unfortunately, I don't think it will be possible to detect the
> tricky fonts.

I think it *is* possible.  The method, as implemented by Toshiya-san,
compares various SFNT table checksums.  Among them is the `cvs '
table, and modifying this table is essentially impossible without
interpreting and changing the bytecode.  Ditto for `fpgm'.  I dare to
say that even a subsetted font with a single glyph contains the
original `cvs ' and `fpgm' tables unmodified, which should enable
FreeType to discover its trickyness.

Do you have counterexamples to this assumption?


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