Re: Changing font weight with buffer-face-mode-invoke

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 27 Jun 2024 08:48:18 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> > Users are not asked about these attributes, certainly not
> > "customarily", not in Emacs. In fact, users are not supposed to be
> > bothered by that at all, they just need to specify the family/families
> > of font(s) they want to use, and Emacs will do the rest automatically.
> 
> Customarily I want to set the height for good visibility which is larger
> than default.  And bold in some cases.

Selecting font size is easy and doesn't require all this complexity.

I was talking about the other font attributes: weight, slant, and
width.

> > IOW, I think you are talking about a problem that doesn't exist for
> > most Emacs users. I understand that you decided for some reason to
> > write some peculiar program that allows selection of these attributes
> > interactively, and I'm prepared to help you find the related Emacs
> > functionalities for that program. 
> 
> > But the problem you are trying to solve is largely an academic one, 
> > because the resulting font will be largely not useful in Emacs, as 
> > you will discover next. 
> 
> Not useful for the reason that it will not activate.  Or because the font 
> characteristics are not useful ?

Because using such a font in various situations and APIs will not
necessarily work.

> > Emacs was not designed to support selection of fonts by fine-tuning their 
> > weight, slant, and other similar attributes, so specifying such fonts works
> > in some cases but doesn't work in others.
> 
> If you do S-<down-mouse-1> to use "Change Buffer Font", one can select those attributes.
> I just want to do the same automatically in elisp code.

There's no practical reason for doing so, that's all I'm saying.