From: Eli Zaretskii <eliz@gnu.org>
To: "Kévin Le Gouguec" <kevin.legouguec@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Order of fonts returned by list-fonts
Date: Sun, 09 Jan 2022 21:55:04 +0200 [thread overview]
Message-ID: <83fspwadlz.fsf@gnu.org> (raw)
In-Reply-To: <87ilusitje.fsf@gmail.com> (message from Kévin Le Gouguec on Sun, 09 Jan 2022 20:43:49 +0100)
> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Cc: emacs-devel@gnu.org
> Date: Sun, 09 Jan 2022 20:43:49 +0100
>
> > As you've probably seen, font_list_entities calls the font driver's
> > 'list' method, and then reverses the resulting list. That is supposed
> > to produce the list of fonts in the same order in which the font
> > driver lists the fonts. Does that mean that Fontconfig produces
> > matching fonts with the best/newest/user-local one the last?
>
> (Mmm. Each time I've seen an nreverse (specifically, at the end of
> font_list_entities and ftfont_list), I've assumed it was because we had
> just iterated over something and accumulated results by Fcons'ing an
> item with an accumulator, so we had "inverted" the order of the thing we
> were iterating on, and nreverse restored the "original" order)
That's right. Here's what ftfont.c does to generate the list of
matching fonts:
for (i = 0; i < fontset->nfont; i++)
{
FcPattern *pat = fontset->fonts[i];
FcChar8 *str;
if (FcPatternGetString (pat, FC_FAMILY, 0, &str) == FcResultMatch)
list = Fcons (intern ((char *) str), list);
}
prev parent reply other threads:[~2022-01-09 19:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-08 22:59 Order of fonts returned by list-fonts Kévin Le Gouguec
2022-01-09 17:37 ` Eli Zaretskii
2022-01-09 19:43 ` Kévin Le Gouguec
2022-01-09 19:55 ` Eli Zaretskii [this message]
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