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Re: How to walk a Lisp_String?

From: Po Lu
Subject: Re: How to walk a Lisp_String?
Date: Fri, 02 Sep 2022 09:08:10 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux)

Manuel Giraud <manuel@ledu-giraud.fr> writes:

> Finally, I'd like to walk this Lisp_String and call FACE_FOR_CHAR for
> each charater of this frame.  And then be able to call XftDrawStringUtf8
> (or XmbDrawString) on each substring/font pair.  WDYT?

That won't work correctly since glyphs do not correspond to characters.

After you obtain the substring containing characters that can be
displayed with a single font, you should pass it to the font driver's
`shape' function, and then give the resulting glyphs and offsets to

Using XftDrawStringUtf8 is a bad idea, along with any other "UTF-8"
interface provided by an X library.  They simply don't work very well,
and cannot handle complicated things such as character compositions and

Using XmbDrawString in conjunction with the Emacs face machinery is
probably a bad idea too, since both have differing notions of "fontset"
and "font".

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