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Re: How to walk a Lisp_String?

From: Manuel Giraud
Subject: Re: How to walk a Lisp_String?
Date: Thu, 01 Sep 2022 22:45:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (berkeley-unix)

Eli Zaretskii <eliz@gnu.org> writes:


> Btw, my suggestion would be to describe your preliminary design ideas
> here before you decide how to implement them.  E.g., it is not clear
> to me why you'd need to walk strings character by character in order
> to use the face machinery.  I'm probably missing something.

Sure, good idea.

I'm working into lwlib only.  So I've made a function to get the frame
of the menu widget (mw).  I'm also converting the char* display_string
of each menu entry to a Lisp_String with make_string (note: I don't know
if I should have done that but it seems the way to get a proper
multi-byte string from a char*).

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?
Manuel Giraud

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