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XScreenSaver is a collection of about two hundred〔(【引用サイトリンク】 date=2008-12-27 )〕 free screensavers for Unix, Mac OS X and iOS. It was created by Jamie Zawinski in 1992 and is still maintained by him.〔(【引用サイトリンク】 date=2008-12-27 )〕 The free software and open source Unix-like operating systems running the X Window System (such as Linux and FreeBSD) use XScreenSaver almost exclusively. On those systems, there are two parts to XScreenSaver: the collection of screen savers; and the framework for blanking and locking the screen. In recent years, some Linux distributions have been using the gnome-screensaver or kscreensaver screen-blanking frameworks by default instead of the framework included with XScreenSaver.〔(【引用サイトリンク】 url=http://www.jwz.org/xscreensaver/faq.html#kde )〕 They still depend on the XScreenSaver collection of screen savers, which is over 90% of the package,〔(【引用サイトリンク】 date=2008-12-27 )〕 with the exception of gnome-screensaver version 3 and onward, which has dropped support for screensavers completely, supporting only simple screen blanking. On Macintosh systems, XScreenSaver works with the usual Apple screen saver framework, and X11 is unneeded. XScreenSaver is released under the terms of the X11 License. == Software architecture == One reason for XScreenSaver's popularity is the modularity of its design, which makes it easy to add new display modes. The display modes (termed "hacks" from the historical usage "display hack") are each stand-alone programs invoked by the xscreensaver daemon. In this way, a third-party screen saver can be written in any language or with any graphics library, so long as it is capable of rendering onto an externally provided window. For portability, the included hacks are all written in C, using libX11 and/or OpenGL 1.3. An important feature of the xscreensaver daemon's design is that the display modes are sandboxed into a separate process from the screen locking framework. This means that a programming error in one of the graphical display modes cannot compromise the screen locker itself (e.g., a crash in a display mode will not un-lock the screen). On Unix systems, running the hacks from the command line will cause them to open their own non-full-screen window. For testing purposes GLMatrix was ported to Wayland.〔(【引用サイトリンク】title=a Wayland screensaver )〕〔(【引用サイトリンク】title=Integrate wscreensaver into Weston )〕 The author choose GLMatrix because it renders with OpenGL and the ones that do not, render with Xlib, and the author did not want to port such to Cairo. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XScreenSaver」の詳細全文を読む スポンサード リンク
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