X Window System core protocol: Difference between revisions

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Latest revision as of 14:33, 25 March 2025

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Most requests for graphic operations include a ''graphic context'', which is a structure that contains the parameters of the graphic operations. A graphic context includes the foreground color, the background color, the font of text, and other graphic parameters. When requesting a graphic operation, the client includes a graphic context. Not all parameters of the graphic context affect the operation: for example, the font does not affect drawing a line.

The core protocol specifies the use of server-side fonts.<ref name="font-faq">{{Cite web|url=http://www.faqs.org/faqs/fonts-faq/part15/|title=comp.fonts FAQ: X11 Info|website=www.faqs.org}}</ref> Such fonts are stored as [[Computer file|file]]s, and the server accesses them either directly via the local [[filesystem]] or via the network from another program called ''font server''. Clients can request the list of fonts available to the server and can request a font to be loaded (if not already) or unloaded (if not used by other clients) by the server. A client can request general information about a font (for example, the font ascent) and the space a specific string takes when drawn with a specific font.{{cn|date=March 2025}}

[[Image:Xfontsel.png|thumb|450px|The <code>xfontsel</code> program allows the user to view the glyphs of a font.]]