From sacadmin Fri Aug 18 14:25:15 2006 Received: from sac.sfbay.sun.com (localhost [127.0.0.1]) by sac.sfbay.sun.com (8.13.6+Sun/8.13.6) with ESMTP id k7ILPF6f014067; Fri, 18 Aug 2006 14:25:15 -0700 (PDT) Received: (from alanc@localhost) by sac.sfbay.sun.com (8.13.6+Sun/8.13.6/Submit) id k7ILPEYt014064; Fri, 18 Aug 2006 14:25:14 -0700 (PDT) Date: Fri, 18 Aug 2006 14:25:14 -0700 (PDT) From: Alan Coopersmith Message-Id: <200608182125.k7ILPEYt014064@sac.sfbay.sun.com> To: LSARC@sac.sfbay.sun.com Cc: Jay.Hobson@Sun.COM Subject: fontconfig Hide/Only/Poor (HOP) language matching [LSARC/2006/485 Timeout: 08/25/2006] Status: RO Content-Length: 4904 Subject: LSARC FastTrack [08/25/2006]: fontconfig Hide/Only/Poor (HOP) language matching I am sponsoring this fasttrack for Jay Hobson of the X11 engineering team. It times out on Friday, August 25 and requests a patch release binding. -Alan Coopersmith- alan.coopersmith@sun.com Sun Microsystems, Inc. - X Window System Engineering Template Version: @(#)sac_nextcase %I% %G% SMI This information Copyright 2006 Sun Microsystems 1. Introduction 1.1. Project/Component Working Name: fontconfig Hide/Only/Poor (HOP) language matching 1.2. Name of Document Author/Supplier: Author: Jay Hobson 1.3 Date of This Document: 18 August, 2006 4. Technical Description This project enhances the fontconfig library to allow fonts to have language subsections labeled Hide/Only/Poor (HOP). This enhancement is required to allow fonts with poor or broken language support to be used while not impacting the languages for which they have bad support. An example of the requirement for this enhancement is seen in bug 6405629 where font Lucida Sans Typewriter has support for both Latin and Arabic. Lucida Sans Typewriter was chosen for its Latin support, but because it has Arabic support, it is chosen over the better KacstQurn font. KacstQurn cannot be moved above Lucida Sans Typewriter in the fontconfig alias because it supports multiple langauges, which would force fonts for the other languages to be moved up. These fonts in turn support Latin languages and result in Lucida Sans Typewriter not being chosen. By allowing the fonts.conf file, or its derivatives, to include support for removing, or reducing a font's support for a particular language, this problem can be solved. In the above example, claiming that Lucida Sans Typewriter has poor support for Arabic will cause fontconfig to continue searching for a better match for Arabic language support. In this case, it will correctly find KacstQurn. Example addition to fonts.conf: Sans-serif Lucida Sans Typewrite ar Additional XML tags added to fontconfig: - denotes language(s) to completely remove from font. This tag is used when a font contains broken glyphs, or bad languages tables, claiming support where none exists. This tag, and below, create local copies of the font pattern, remove languages from the patterns list of supported languages before performing the match to the request. In this way, the font is prevented from being a match. The local copy is destroyed after the match is performed. - denotes language to perform operation on. - denotes the only language(s) that a font supports. This tag is the opposite of hide, where it may be more convenient to specify the list of allowed languages instead of the list of hidden languages. - denotes language(s) that the font has poor quality. This tag lowers the matching score for this fonts support for the specified langauge(s) allowing fonts further down the alias list to be used. If no better font is found to support the language in question, the poor font will be selected. This ability to continue to use the font if nothing better is found is the distinguishing characteristic over and which do not allow the font to be used if nothing better is found. - This existing tag is overloaded to include the HOP functionality. This modifiction only affects aliases created in fonts.conf. If a user specifically requests a particular font, that font will be returned. Future direction: This new XML interface addition is being declared Volatile, because while this patch has been contributed back to the open source community, it is unclear at this time which direction the community will take to resolve this problem. At some future point, if the community standardizes on solving the problem in a different way, we will want to remain compatible, and this present solution will be backed out. --------------------------------------------------------------------------- Imported interfaces: Interface Stability Comments ---------- --------- -------- /etc/fonts/fonts.conf External LSARC 2003/273 /etc/fonts/fonts.dtd External LSARC 2003/273 /usr/lib/libfontconfig.so.1 External LSARC 2003/273 Exported interfaces: -------------------- Interface Stability Comments ---------- --------- -------- fontconfig HOP XML interface Volatile see Future Direction. 6. Resources and Schedule 6.4. Steering Committee requested information 6.4.1. Consolidation C-team Name: X 6.5. ARC review type: FastTrack From sacadmin Mon Aug 28 14:51:18 2006 Received: from almas.sfbay.sun.com (almas.SFBay.Sun.COM [129.146.108.211]) by sac.sfbay.sun.com (8.13.6+Sun/8.13.6) with ESMTP id k7SLpIZE014040; Mon, 28 Aug 2006 14:51:18 -0700 (PDT) Received: from [IPv6:::1] (localhost [IPv6:::1]) by almas.sfbay.sun.com (8.13.6+Sun/8.13.6) with ESMTP id k7SLpGUt023006; Mon, 28 Aug 2006 14:51:18 -0700 (PDT) Message-ID: <44F36554.403@sun.com> Date: Mon, 28 Aug 2006 14:51:16 -0700 From: Alan Coopersmith User-Agent: Thunderbird 1.5.0.2 (X11/20060427) MIME-Version: 1.0 To: Alan Coopersmith CC: LSARC@sac.sfbay.sun.com, Jay.Hobson@sun.com Subject: Re: fontconfig Hide/Only/Poor (HOP) language matching [LSARC/2006/485 Timeout: 08/25/2006] References: <200608182125.k7ILPEYt014064@sac.sfbay.sun.com> In-Reply-To: <200608182125.k7ILPEYt014064@sac.sfbay.sun.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Status: RO Content-Length: 462 Alan Coopersmith wrote: > Subject: LSARC FastTrack [08/25/2006]: fontconfig Hide/Only/Poor (HOP) language matching > > I am sponsoring this fasttrack for Jay Hobson of the X11 engineering team. > It times out on Friday, August 25 and requests a patch release binding. Having received no comments or objections, this case is now closed approved. -- -Alan Coopersmith- alan.coopersmith@sun.com Sun Microsystems, Inc. - X Window System Engineering