From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Kangas Newsgroups: gmane.emacs.bugs Subject: bug#47040: 27.1; PNG binary transparency is ignored Date: Sun, 31 Oct 2021 07:49:16 -0700 Message-ID: References: <86o8fr1e3d.fsf@gmail.com> <87czw7jbgq.fsf@gnus.org> <83tupjniri.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7562"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: ynyaaa@gmail.com, Lars Ingebrigtsen , 47040@debbugs.gnu.org To: Alan Third Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Oct 31 15:50:14 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 1mhCA1-0001mF-27 for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Oct 2021 15:50:13 +0100 Original-Received: from localhost ([::1]:47596 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mhC9z-0001TC-M3 for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Oct 2021 10:50:11 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37866) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mhC9r-0001SX-7o for bug-gnu-emacs@gnu.org; Sun, 31 Oct 2021 10:50:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:49481) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mhC9q-0007dL-Vw for bug-gnu-emacs@gnu.org; Sun, 31 Oct 2021 10:50:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mhC9q-00072n-TT for bug-gnu-emacs@gnu.org; Sun, 31 Oct 2021 10:50:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Kangas Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 31 Oct 2021 14:50:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 47040 X-GNU-PR-Package: emacs Original-Received: via spool by 47040-submit@debbugs.gnu.org id=B47040.163569176426896 (code B ref 47040); Sun, 31 Oct 2021 14:50:02 +0000 Original-Received: (at 47040) by debbugs.gnu.org; 31 Oct 2021 14:49:24 +0000 Original-Received: from localhost ([127.0.0.1]:32794 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mhC9E-0006zk-27 for submit@debbugs.gnu.org; Sun, 31 Oct 2021 10:49:24 -0400 Original-Received: from mail-pf1-f175.google.com ([209.85.210.175]:36479) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mhC9C-0006zX-Md for 47040@debbugs.gnu.org; Sun, 31 Oct 2021 10:49:23 -0400 Original-Received: by mail-pf1-f175.google.com with SMTP id m26so14000810pff.3 for <47040@debbugs.gnu.org>; Sun, 31 Oct 2021 07:49:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:in-reply-to:references:user-agent :mime-version:date:message-id:subject:to:cc; bh=8mxfDdBle5Z/4td0WU5Q4DeFA3GdBrRAinmT5YNFVRI=; b=q16m4KBqo8pByfDxDpv88Z8/JED10GGLZAarRVPN39+Tckyct+Gzg6nqqpZtfx3ER1 hB61bPJ/8hiWfcu/TSiz7mgqOPeCk8WyE0DmsLL+Q3XbBDuS6UeLcVQsiU3Wse7F2Kwn umkQEh8vaLLIjvuECp2ZbDXo0kJFivgEdKk9Hdxi3ywfGw7OcXJYBqLIDWFNp+NfF6vz g8lV8blNkvKMUX9TDFX3nAotr3ksRd6EbVAuuuhuKJaCGid/8DEjYneJ5buJ84pyP5Z9 WIqp3SeoSNKxws0l37Dh1zCey8rFBHTA1jyHmUXG77Fy8QTWclbDHnHb05jBS1D94e+F 8jyw== X-Gm-Message-State: AOAM530Md2TtQbSjhV7ltXX1Xi1nsPfYJjPLgj5jEelfB4FsA8HzvrTn EaIJechbSk6hEqtWgQiyuaf9fEGDHwLibUxISqY= X-Google-Smtp-Source: ABdhPJxhs+ECdyy7mAxLIHR1rSKLgl/CFj0DERNw5ok6q++GnxMKmg2pRS3kXn4zul6F5xLD0ZgQSsDInoL50t68v1k= X-Received: by 2002:a05:6a00:244d:b0:44d:c279:5155 with SMTP id d13-20020a056a00244d00b0044dc2795155mr22818591pfj.0.1635691756976; Sun, 31 Oct 2021 07:49:16 -0700 (PDT) Original-Received: from 753933720722 named unknown by gmailapi.google.com with HTTPREST; Sun, 31 Oct 2021 07:49:16 -0700 In-Reply-To: (Alan Third's message of "Wed, 10 Mar 2021 22:14:25 +0000") 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:218689 Archived-At: Alan Third writes: > I see the same on NS, so it must be something wrong with the libpng > support code. Although I don't know why Lars doesn't see it on Debian. > > I wonder if it's related to image.c:6909 > > # ifdef PNG_tRNS_SUPPORTED > > It looks like that is not defined here... I don't really understand > what the png code is doing with transparency. That was added in commit 8826beaf0066. I think this if this is undefined in your case, I think it could be a problem with your libpng build, as Paul alludes to here: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37153#71 As far as I can tell from here, https://github.com/mitsuba-renderer/libpng/search?q=PNG_tRNS_SUPPORTED and here, https://github.com/mitsuba-renderer/libpng/blob/master/scripts/pnglibconf.h.prebuilt libpng is built with PNG_tRNS_SUPPORTED by default. So why is your libpng not built with that?