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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Fill column indicator functionality
Date: Mon, 18 Mar 2019 05:35:43 +0200
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To: Ergus <spacibba@aol.com>
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> Date: Mon, 18 Mar 2019 02:03:13 +0100
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> The variable fill-column is defined in the buffer.c file. I should
> access it in every display_line when display-fill-column is enabled if I
> want to keep the difference between display-fill-column-indicator-column
> and fill-column. (when display-fill-column-indicator is t).
> 
> Whats the better method to do that?

Are you worried about performance?  If so, then don't: accessing a
single variable is not something that would slow down redisplay in any
tangible way.  So I don't recommend any more complex solution that
somehow caches the fill-column value, it isn't justified in this case.