It is reset but, after CV program execution. Is it possible to reset it before 
CV program execution?

From: Alexei Podtelezhnikov <[email protected]>
Date: Wednesday, October 15, 2025 at 12:41 PM
To: Honnesh Ramachandra <[email protected]>
Cc: Werner LEMBERG <[email protected]>, [email protected] 
<[email protected]>
Subject: Re: Bug report: Set exec->backward_compatibility flag before TT CV 
program re-execution

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On Oct 15, 2025, at 12:29, Alexei Podtelezhnikov <[email protected]> wrote:



Given that this is a font issue and we don’t want to compensate for it. Is it 
possible to reset exec->backward_compatibility to known state every time a 
glyph is loaded since that is the root cause of the inconsistency in rendering 
of the glyph(irrespective of whether is correct or not).


It is already reset each time tt_loader_init is executed, which is for each 
glyph.

Therefore, I doubt that you identified the problem correctly. What is legal and 
problematic are the twilight point. Those can be moved by glyf and persist, 
which can create interesting effects.

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