From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#47040: 27.1; PNG binary transparency is ignored Date: Wed, 10 Mar 2021 17:14:09 +0200 Message-ID: <83tupjniri.fsf@gnu.org> References: <86o8fr1e3d.fsf@gmail.com> <87czw7jbgq.fsf@gnus.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7245"; mail-complaints-to="usenet@ciao.gmane.io" Cc: ynyaaa@gmail.com, 47040@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Mar 10 16:15:13 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 1lK0YL-0001lF-EN for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 10 Mar 2021 16:15:13 +0100 Original-Received: from localhost ([::1]:42576 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lK0YK-0006FG-Fz for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 10 Mar 2021 10:15:12 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:47448) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lK0YC-0006F5-RD for bug-gnu-emacs@gnu.org; Wed, 10 Mar 2021 10:15:04 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:40036) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lK0YA-0001v1-1B for bug-gnu-emacs@gnu.org; Wed, 10 Mar 2021 10:15:04 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lK0Y9-00040i-T1 for bug-gnu-emacs@gnu.org; Wed, 10 Mar 2021 10:15:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 10 Mar 2021 15:15:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 47040 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: moreinfo Original-Received: via spool by 47040-submit@debbugs.gnu.org id=B47040.161538926015357 (code B ref 47040); Wed, 10 Mar 2021 15:15:01 +0000 Original-Received: (at 47040) by debbugs.gnu.org; 10 Mar 2021 15:14:20 +0000 Original-Received: from localhost ([127.0.0.1]:51582 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lK0XU-0003zd-2t for submit@debbugs.gnu.org; Wed, 10 Mar 2021 10:14:20 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:57588) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lK0XS-0003zP-NI for 47040@debbugs.gnu.org; Wed, 10 Mar 2021 10:14:19 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:34995) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lK0XL-0001Ph-Hv; Wed, 10 Mar 2021 10:14:11 -0500 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1356 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1lK0XK-0000B3-UP; Wed, 10 Mar 2021 10:14:11 -0500 In-Reply-To: <87czw7jbgq.fsf@gnus.org> (message from Lars Ingebrigtsen on Wed, 10 Mar 2021 16:05:25 +0100) 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:202001 Archived-At: > From: Lars Ingebrigtsen > Date: Wed, 10 Mar 2021 16:05:25 +0100 > Cc: 47040@debbugs.gnu.org > > > Red pixels in the both images have 0 for alpha value, so they should be > > transparent and invisible, but transparent1.png is displayed as a red > > square with a green frame in a emacs buffer. > > > > transparent2.png is displayed as a white square with a green frame as > > expected. > > > > When they are displayed in a chrome browser, inner squares of the both > > images are displayed as transparent. > > I'm unable to reproduce this in Emacs 27.1 in Debian/bullseye, so this > may be a Windows-specific problem. It may also be fixed in Emacs 28, > since the transparency code has gotten a lot of work. Would it be > possible for you to check in Emacs 28 whether this problem is still > present there? > > If not, can somebody else with Windows and Emacs 28 check whether the > problem is still present? The problem is still present when using the default libpng, but not if I use the w32 native image API.