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

From: suzuki toshiya
Subject: Re: [ft-devel] gamma correction and stem darkening
Date: Tue, 19 Jan 2016 22:37:19 +0900
User-agent: Mozilla-Thunderbird (X11/20100329)

oh my god. now the detection of tricky fonts is
becoming something like a discussion for anti-virus
software... Do we need the bytecode level finger
printing? The embedding producer can spend longer
time for bytecode interpretation and size optimization,
but the reader of embedded font would not want to
spend similar time to detect the tricky fonts...

Behdad Esfahbod wrote:
> On 16-01-17 06:58 AM, Werner LEMBERG wrote:
>> 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.
> Note that this will eventually change ;).
> behdad
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