X Window System core protocol: Difference between revisions

Revision as of 04:37, 15 June 2024

Revision as of 17:52, 19 November 2024

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[[Image:X11.svg|thumb|100px|The X Window System logo]]

The '''X Window System core protocol'''<ref name="sche-gett">Robert W. Scheifler and James Gettys: ''X Window System: Core and extension protocols, X version 11, releases 6 and 6.1'', Digital Press 1996, {{ISBN|1-55558-148-X}}</ref><ref name="rfc 1013">RFC 1013</ref><ref name="intr">Grant Edwards. [http://www.visi.com/~grante/Xtut/ An Introduction to X11 User Interfaces] {{Webarchive|url=https://web.archive.org/web/20070103060448/http://www.visi.com/~grante/Xtut/ |date=2007-01-03 }}</ref> is the base protocol of the [[X Window System]], which is a [[Computer network|networked]] [[windowing system]] for [[bitmap]] displays used to build [[graphical user interface]]s on [[Unix]], [[Unix-like]], and other [[operating system]]s. The X Window System is based on a [[client–server model]]: a single [[Server (computing)|server]] controls the [[input/output]] hardware, such as the [[Computer screen|screen]], the [[Computer keyboard|keyboard]], and the [[Computer mouse|mouse]]; all application [[Computer program|program]]s act as [[client (computing)|client]]s, interacting with the [[user (computing)|user]] and with the other clients via the server. This interaction is regulated by the X Window System core protocol. Other [[protocol (computing)|protocol]]s related to the X Window System exist, both built at the top of the X Window System core protocol or as separate protocols.

In the X Window System core protocol, only four kinds of packets are sent, [[wikt:asynchronously|asynchronously]], over the network: requests, replies, events, and errors. ''Requests'' are sent by a client to the server to ask it to perform some operation (for example, create a new window) and to send back data it holds. ''Replies'' are sent by the server to provide such data. ''Events'' are sent by the server to notify clients of user activity or other occurrences they are interested in. ''Errors'' are packets sent by the server to notify a client of errors occurred during processing of its requests. Requests may generate replies, events, and errors; other than this, the protocol does not mandate a specific order in which packets are sent over the network. Some extensions to the core protocol exist, each one having its own requests, replies, events, and errors.

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A part of the X colour system is the X Color Management System (xcms). This system was introduced with X11R6 Release 5 in 1991. This system consists of several additional features in xlib, found in the Xcms* series of functions. This system defines device independent color schemes which can be converted into device dependent RGB systems. The system consists of the xlib Xcms* functions and as well the X Device Color Characterization Convention (XDCCC) which describes how to convert the various device independent colour systems into device dependent RGB colour systems. This system supports the [[CIEXYZ]], [[xyY]], [[CIELUV]] and [[CIELAB]] and as well the [[TekHVC]] colour systems.

[http://insar.stanford.edu/~lharcke/programming/Xcms/] {{Webarchive|url=https://web.archive.org/web/20111005224650/http://insar.stanford.edu/~lharcke/programming/Xcms/ |date=2011-10-05 }}, [http://tronche.com/gui/x/xlib/color/]

== Atoms ==

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*[http://www.x.org/ X.Org Foundation] (official home page) - [http://xorg.freedesktop.org/wiki/ Mirror] with the ___domain name 'freedesktop.org'.

*[https://xwindow.angelfire.com/ X Window System Internals]

*[http://www.rahul.net/kenton/bib.html Kenton Lee's pages on X Window and Motif] {{Webarchive|url=https://web.archive.org/web/20130520013725/http://www.rahul.net/kenton/bib.html |date=2013-05-20 }}

*[http://www.x.org/releases/current/doc/xproto/x11protocol.html X Window System Protocol, Version 11 (current Release)]

{{XWinSys}}