From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#21028: Slow font rendering in emacs Date: Wed, 15 Mar 2017 17:40:17 +0200 Message-ID: <83varaa6qm.fsf@gnu.org> References: <559F9FAF.8090708@live.com> <83zigpayz8.fsf@gnu.org> <83tw6wc3mz.fsf@gnu.org> <3c939f8c-8f78-12b8-3e07-242aa6dd12be@ralfj.de> <83a88nbx79.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1489592541 814 195.159.176.226 (15 Mar 2017 15:42:21 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 15 Mar 2017 15:42:21 +0000 (UTC) Cc: 21028@debbugs.gnu.org, post@ralfj.de To: John Mastro Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Mar 15 16:42:17 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1coB3y-0007lP-EI for geb-bug-gnu-emacs@m.gmane.org; Wed, 15 Mar 2017 16:42:10 +0100 Original-Received: from localhost ([::1]:38071 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coB44-0004g2-Hp for geb-bug-gnu-emacs@m.gmane.org; Wed, 15 Mar 2017 11:42:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36499) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coB3u-0004dI-3x for bug-gnu-emacs@gnu.org; Wed, 15 Mar 2017 11:42:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1coB3q-0004Bi-7l for bug-gnu-emacs@gnu.org; Wed, 15 Mar 2017 11:42:06 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:59159) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1coB3q-0004BT-3s for bug-gnu-emacs@gnu.org; Wed, 15 Mar 2017 11:42:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1coB3p-00076r-RG for bug-gnu-emacs@gnu.org; Wed, 15 Mar 2017 11:42:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 15 Mar 2017 15:42:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 21028 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 21028-submit@debbugs.gnu.org id=B21028.148959246427262 (code B ref 21028); Wed, 15 Mar 2017 15:42:01 +0000 Original-Received: (at 21028) by debbugs.gnu.org; 15 Mar 2017 15:41:04 +0000 Original-Received: from localhost ([127.0.0.1]:57358 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1coB2u-00075e-6A for submit@debbugs.gnu.org; Wed, 15 Mar 2017 11:41:04 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:44940) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1coB2s-00074x-Jk for 21028@debbugs.gnu.org; Wed, 15 Mar 2017 11:41:02 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1coB2m-0003ZX-HM for 21028@debbugs.gnu.org; Wed, 15 Mar 2017 11:40:57 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:57415) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coB2e-0003Qs-Sr; Wed, 15 Mar 2017 11:40:48 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:1243 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1coB2d-00008r-MD; Wed, 15 Mar 2017 11:40:48 -0400 In-reply-to: (message from John Mastro on Tue, 14 Mar 2017 13:49:59 -0700) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:130617 Archived-At: > From: John Mastro > Date: Tue, 14 Mar 2017 13:49:59 -0700 > Cc: Eli Zaretskii , Ralf Jung > > > 2) set up a very detailed fontset with explicit ranges of codepoints > > allotted to each font that supports the respective characters > > well and whose looks on display you like > > Is it possible to get the codepoint ranges supported by a given font > programmatically within Emacs? Yes (although this capability doesn't seem to be exposed to Lisp as of now). But it's expensive when done for many fonts, because it requires opening each such font. > It sounds like that might help a user tell Emacs "use this font for > everything it supports" without specifying an overly-broad target > (like `unicode') or finding and spelling out the ranges of > codepoints manually. Yes, this could be a base of a useful feature. > In other words, I'm imagining something like this: > > (dolist (target (targets-supported-by-font "DejaVu Sans Mono")) > (set-fontset-font "fontset-default" target > (font-spec :name "DejaVu Sans Mono" :registry "iso10646-1") > nil 'prepend)) > > Where `targets-supported-by-font' is the hypothetical function I'm > imagining. This is not suitable for running at Emacs startup time, IMO, as it will probably slow down the startup too much. > Apologies if this doesn't actually make sense :) No apologies needed. This is a complex issue, and I'm not an expert either.