From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Testing font things Date: Tue, 29 Nov 2022 22:48:53 -0500 Message-ID: References: <87bkoz6dkg.fsf@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36727"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: emacs-devel@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Nov 30 04:49:26 2022 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 1p0E69-0009LJ-R3 for ged-emacs-devel@m.gmane-mx.org; Wed, 30 Nov 2022 04:49:26 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p0E5p-0006sm-0i; Tue, 29 Nov 2022 22:49:05 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p0E5l-0006s5-OL for emacs-devel@gnu.org; Tue, 29 Nov 2022 22:49:01 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p0E5j-000604-1a for emacs-devel@gnu.org; Tue, 29 Nov 2022 22:49:00 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 250E944251B; Tue, 29 Nov 2022 22:48:57 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id C06274424FE; Tue, 29 Nov 2022 22:48:55 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1669780135; bh=ESyZgKl4C+O97Z+FVvjQs0h6Cgh+q7LRNOV2wng6IHE=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=R9ze74S1j+4C/1SySoxzVOlMaQtgZ7LWaVylMHd/75eOhK5fNHPFnwJR6WDU2QdtK zPNAHmIsDFZSQGO7SYOVY/UF/wc1qsQfwDIerykDFhsOpPPEfZWK69ciUdlMNabhyU JkO6KBz7prFwfGJrzPQfUeMU61KGpGJHtRnmEsBZO7T/2kiN1FahRIp/Ur2fD3kVit MXdFSu4ugO1N/QwxS/FS3+uA7zczN0axiAsKOhwIXwjQKwdd3Aqv145BX/RhfMF87r rwmhavVZWrn1n2tMv38YVGQ2KMCHPZSnodKmAa8QtfWesgVTOjT00ei3b5st14DoGv QP5g55y+UpDrw== Original-Received: from pastel (unknown [104.247.241.157]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 8B66B120346; Tue, 29 Nov 2022 22:48:55 -0500 (EST) In-Reply-To: <87bkoz6dkg.fsf@yahoo.com> (Po Lu's message of "Tue, 22 Nov 2022 08:24:47 +0800") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:300749 Archived-At: >> But this fails because `fonts-at` gets me a "font-object" whereas >> `list-fonts` gets me "font entities". How can I convert one to >> the other? > > You should resort to comparing font attributes with `font-get' instead. I think I can get something acceptable with `font-get`. indeed, thank you. > I don't think what you want is reliably possible. Hmmm... based on my naive understanding of these things I think we should be able to convert a font-entity into a font-object by calling the `open_font` method of the font driver. Of course, this can fail and it's not free so it's not a good option. Similarly it should be possible to compare font-object and font-entities but ignoring the last few fields. Or offer a function to convert a font-object or font-entity into a font-spec (similarly by dropping the last few fields). Also maybe we can use the FONT_OBJLIST_INDEX field of font-entities to provide a "font-instance-of" test to see if a font-object is an instance of a given font-entity. Stefan