From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Jason Rumney Newsgroups: gmane.emacs.devel Subject: Re: Several suggestions for image support Date: Fri, 16 Apr 2004 10:09:07 +0100 Organization: Integra SP Ltd Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <407FA2B3.1060800@gnu.org> References: NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1082106844 27239 80.91.224.253 (16 Apr 2004 09:14:04 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Fri, 16 Apr 2004 09:14:04 +0000 (UTC) Cc: David Kastrup , emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Fri Apr 16 11:13:56 2004 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1BEPQ3-0006tp-00 for ; Fri, 16 Apr 2004 11:13:55 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.35 #1 (Debian)) id 1BEPQ3-0002Uu-00 for ; Fri, 16 Apr 2004 11:13:55 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BEPOM-0005eR-VD for emacs-devel@quimby.gnus.org; Fri, 16 Apr 2004 05:12:10 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.30) id 1BEPMc-0003qI-Sb for emacs-devel@gnu.org; Fri, 16 Apr 2004 05:10:22 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.30) id 1BEPLt-0002je-MP for emacs-devel@gnu.org; Fri, 16 Apr 2004 05:10:10 -0400 Original-Received: from [209.61.173.204] (helo=integrasp.com) by monty-python.gnu.org with smtp (Exim 4.30) id 1BEPLs-0002iL-QP for emacs-devel@gnu.org; Fri, 16 Apr 2004 05:09:36 -0400 Original-Received: (qmail 13746 invoked from network); 16 Apr 2004 08:55:07 -0000 Original-Received: from unknown (HELO ntserver.integrasp.com) (217.207.198.106) by 66.216.96.43 with SMTP; 16 Apr 2004 08:55:07 -0000 Original-Received: from gnu.org (altiojr.altio.com [192.168.111.196]) by ntserver.integrasp.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id 2CQ68Z8T; Fri, 16 Apr 2004 10:09:06 +0100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-gb, en, ja Original-To: "Kim F. Storm" In-Reply-To: X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.4 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:21738 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:21738 Kim F. Storm wrote: > David Kastrup writes: > >>PNG images support transparency. Emacs can't make use of it. You can >>only have Emacs declare a particular color as transparent. This is >>dissatisfactory. It should tell the PNG decoding routines Emacs' >>background color for the purpose of transparency. > > Using `:mask heuristic' should make the image background transparent. > The tool-bar code uses this. I don't think :mask heuristic has anything to do with PNG transparency. It is for heuristically determining the background color of a non-transparent image, in order to make it transparent. That said, PNG transparency used to just work back when I was porting image support to Windows.