From owner-freebsd-gecko@FreeBSD.ORG  Sun Oct 19 18:23:24 2014
Return-Path: <owner-freebsd-gecko@FreeBSD.ORG>
Delivered-To: gecko@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 51DA78A2
 for <gecko@freebsd.org>; Sun, 19 Oct 2014 18:23:24 +0000 (UTC)
Received: from sinkng.sics.se (unknown
 [IPv6:2001:6b0:3a:1:c654:44ff:fe45:117c])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id D9C8278E
 for <gecko@freebsd.org>; Sun, 19 Oct 2014 18:23:23 +0000 (UTC)
Received: from P142s.sics.se (h139n3-u-d1.ias.bredband.telia.com
 [90.228.197.139])
 by sinkng.sics.se (8.14.9/8.14.9) with ESMTP id s9JINJnW028009
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK);
 Sun, 19 Oct 2014 20:23:20 +0200 (CEST)
 (envelope-from bengta@P142s.sics.se)
Received: from P142s.sics.se (localhost [127.0.0.1])
 by P142s.sics.se (8.14.9/8.14.9) with ESMTP id s9JIMAuH053777;
 Sun, 19 Oct 2014 20:22:10 +0200 (CEST)
 (envelope-from bengta@P142s.sics.se)
Received: (from bengta@localhost)
 by P142s.sics.se (8.14.9/8.14.9/Submit) id s9JIMAfe053776;
 Sun, 19 Oct 2014 20:22:10 +0200 (CEST)
 (envelope-from bengta@P142s.sics.se)
From: Bengt Ahlgren <bengta@sics.se>
To: gecko@freebsd.org
Subject: Downscaled images broken in Firefox built with OPTIMIZED_CFLAGS
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (berkeley-unix)
Date: Sun, 19 Oct 2014 20:22:10 +0200
Message-ID: <uh738ajvs19.fsf@P142s.sics.se>
MIME-Version: 1.0
Content-Type: text/plain
X-BeenThere: freebsd-gecko@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Gecko Rendering Engine issues <freebsd-gecko.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-gecko>,
 <mailto:freebsd-gecko-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-gecko/>
List-Post: <mailto:freebsd-gecko@freebsd.org>
List-Help: <mailto:freebsd-gecko-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-gecko>,
 <mailto:freebsd-gecko-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 19 Oct 2014 18:23:24 -0000

I have started to see this problem (now with FF 33.0) with white stripes
in downscaled images:

https://bugzilla.mozilla.org/show_bug.cgi?id=810604

That bug report says that the problem appears when compiling with -O3 -
-O2 (or -Os) should be ok.  My FF indeed seems to be built with -O3 when
using standard options.  I rebuilt with unchecked option
OPTIMIZED_CFLAGS, and the problem disappeared.

A workaround is to turn off image.high_quality_downscaling.enabled.

(I run 9.3-REL amd64, but build packages on 9.1-REL using poudriere.)

Bengt