[Dev-luatex] missing signature in the manual

Hans Hagen pragma at wxs.nl
Sun Feb 8 00:35:08 CET 2009


Taco Hoekwater wrote:

> That one doesn't actually work (it is never called). There are
> interesting issues when it comes to the timing of this, and that made
> me stop when I first looked at it (seems like a long time ago).
> The original goal of this callback was to provide a method to create
> missing glyphs on the fly, but it was surprisingly hard to find the
> right time to do that check.
> 
> Just after hyphenation and before the kerning/ligaturing step would
> be a good moment, but since those are all callbacks now themselves,
> maybe I should just forget about char_exists completely.

if i remember right we dropped the idea char_exists in favour of the 
ability to add (virtual) characters to a font (only once per char) but 
we put than wish on the long term wishlist

Hans


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