From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Werner LEMBERG Newsgroups: gmane.emacs.bugs Subject: bug#50177: Support U+20DD COMBINING ENCLOSING CIRCLE Date: Sat, 28 Aug 2021 06:40:02 +0000 (UTC) Message-ID: <20210828.084002.1335089005801839087.wl@gnu.org> References: <87eeaj21py.8.fsf@jidanni.org> <8335qyx0f3.fsf@gnu.org> <87tuja2ido.fsf@gnu.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20695"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 50177@debbugs.gnu.org, larsi@gnus.org, jidanni@jidanni.org To: handa@gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Aug 28 08:41:16 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mJs1k-0005EH-Bq for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 28 Aug 2021 08:41:16 +0200 Original-Received: from localhost ([::1]:38118 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mJs1j-0004ZJ-2u for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 28 Aug 2021 02:41:15 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54568) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mJs1W-0004ZB-G6 for bug-gnu-emacs@gnu.org; Sat, 28 Aug 2021 02:41:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:41758) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mJs1W-0003GN-8E for bug-gnu-emacs@gnu.org; Sat, 28 Aug 2021 02:41:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mJs1V-0000ug-W4 for bug-gnu-emacs@gnu.org; Sat, 28 Aug 2021 02:41:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Werner LEMBERG Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 28 Aug 2021 06:41:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 50177 X-GNU-PR-Package: emacs Original-Received: via spool by 50177-submit@debbugs.gnu.org id=B50177.16301328183448 (code B ref 50177); Sat, 28 Aug 2021 06:41:01 +0000 Original-Received: (at 50177) by debbugs.gnu.org; 28 Aug 2021 06:40:18 +0000 Original-Received: from localhost ([127.0.0.1]:53304 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mJs0n-0000tY-Sf for submit@debbugs.gnu.org; Sat, 28 Aug 2021 02:40:18 -0400 Original-Received: from mout01.posteo.de ([185.67.36.65]:38695) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mJs0k-0000tE-Ez for 50177@debbugs.gnu.org; Sat, 28 Aug 2021 02:40:17 -0400 Original-Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id E8EFF240026 for <50177@debbugs.gnu.org>; Sat, 28 Aug 2021 08:40:08 +0200 (CEST) Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4GxRlq0bGJz6tmF; Sat, 28 Aug 2021 08:40:06 +0200 (CEST) In-Reply-To: <87tuja2ido.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:212855 Archived-At: >> CC'ing Handa-san, in the hope that he could explain better why we >> disallow character composition from different fonts. > > The main reason is what Eli wrote. An opentype font contains rules > to tell how to compose two glyphs in that font. But such rules are > specific to that font, and there's no way to combine rules of > different fonts. So, an opentype rendering engine does not work for > different fonts. > > And, when we artificially compose characters from different fonts, > there is a possibility that the resulting image looks like a > different character which I think is worse than not composing. +1 Werner