From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: Ligature support Date: Fri, 05 Nov 2021 16:20:19 +0100 Message-ID: <87zgqiiq8c.fsf@gnus.org> References: <87cznths5j.fsf@gnus.org> <8ff3b131c56b7b2d1d6f@heytings.org> <83bl39tqnl.fsf@gnu.org> <8ff3b131c531f5254799@heytings.org> <83a6ittp5r.fsf@gnu.org> <8ff3b131c53b9df49236@heytings.org> <834k91th5c.fsf@gnu.org> <8ff3b131c5fe09753ca0@heytings.org> <83mtmtru6l.fsf@gnu.org> <8ff3b131c57f741d04e5@heytings.org> <83lf2drqx6.fsf@gnu.org> <87lf2c3k0z.fsf@gnus.org> <83wnlwqocq.fsf@gnu.org> <87wnlwyox9.fsf@gnus.org> <83lf2cq7n5.fsf@gnu.org> <87wnlnkxbo.fsf@gnus.org> <83cznfdohr.fsf@gnu.org> <87zgqik9bk.fsf@gnus.org> <83v916d64z.fsf@gnu.org> <878ry2k6qz.fsf@gnus.org> <83tugqd488.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9161"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: mattiase@acm.org, raman@google.com, gregory@heytings.org, schwab@linux-m68k.org, stefankangas@gmail.com, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Nov 05 16:22:23 2021 Return-path: Envelope-to: ged-emacs-devel@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 1mj12t-000250-1C for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Nov 2021 16:22:23 +0100 Original-Received: from localhost ([::1]:35802 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mj12r-0007Z8-7h for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Nov 2021 11:22:21 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35950) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mj11M-0006Sj-Q2 for emacs-devel@gnu.org; Fri, 05 Nov 2021 11:20:48 -0400 Original-Received: from quimby.gnus.org ([2a01:4f9:2b:f0f::2]:58462) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mj11K-00035X-SZ; Fri, 05 Nov 2021 11:20:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=fOdmBBsUiOa1ZTUUEKtchYnWxhPqgId2FItoX5Sfs4Y=; b=huAS0oKWSC7SCq1gt3fIcmmDts 9vl2psqCbjQUHXaydkaYmtpwqiNyyamMt3k8MLAlfGMzbIiBsslw5arr6LAROs2Sdv11g2NVjdayM FvZeDZ4zcRLRDr9OYg3ma7pDLAgQSmCoyKF3kmaaxPPWQbv9dASY1Tu19ZX0WcbONVbY=; Original-Received: from [84.212.220.105] (helo=elva) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mj10v-0005qp-7E; Fri, 05 Nov 2021 16:20:27 +0100 X-Now-Playing: Coffins's _Defilements_: "Hatred Storm" In-Reply-To: <83tugqd488.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 05 Nov 2021 17:14:31 +0200") Received-SPF: pass client-ip=2a01:4f9:2b:f0f::2; envelope-from=larsi@gnus.org; helo=quimby.gnus.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:278776 Archived-At: Eli Zaretskii writes: > Why do we need to depend on the font? As I said, if the font doesn't > have a ligature, font-shape-gstring will return nil, and we will then > display the characters as individual glyphs. Isn't that what is > expected? Different fonts have different ligatures (or "ligatures"). Since we don't want to send all strings through font-shape-gstring (because that'll be slow), we'll have to be selective as usual, I think? For instance, my test font has these ligatures: I.e. "#01" is translated into a very different glyph, and we need to know that so that we can send "#01" to harfbuzz to get the glyph out. (This is how all the "neat" programming fonts that translate => into fun glyphs work.) This data is in the GPOS table, and I just found this fun utility: ttx -t GPOS ~/.fonts/Jolie\ Romantique.ttf I'll have a peek at the source code to see how much work it is to extract this data. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no