The X Window System - Design Principles

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The X Window System - Design Principles Josef Spillner <[email protected]>, May 2003 Based on Jim Gettys' video presentation The X Window System - Design Principles ● Video recapitulation ● X11 protocol terms protocol atoms ● C interface: Xlib ● Extensions glX (OpenGL) DOUBLE-BUFFER MIT-SHM ● IPC with ICElib ● Discussion Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles Recapitulation Jim Gettys, Rob Scheifler developed distributed windowing system Open standard, many implementations today Window managers Toolkits Networking issues Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles Terms and acronyms server: graphical display client: application window: attributes visual: “drawable” requests events errors atoms: see next slide Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles X atoms packet structure: header + data samples of atoms include: CARDINAL PIXMAP STRING FONT RGB_GRAY_MAP WM_NAME STRIKEOUT_DESCENT Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles Xlib (main X library) <X11/Xlib.h> client-side protocol wrapper low-level, thus: toolkit libraries Xt -> Motif -> Qt, Gtk+ glut, SDL Demonstration! Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles X protocol extensions glX: OpenGL context DOUBLE-BUFFER: ensure flicker-free graphics operations MIT-SHM: high-performance messaging shortcut Extensions are implementation dependent -> fallbacks? Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles Inter-client exchange: ICElib Generic IPC facility Independent of X11, but can gain network transparency and more K Desktop Environment: DCOP Representative for many other X libraries: ICCCM, fontlib, XIM Josef Spillner <[email protected]>, May 2003 The X Window System - Design Principles XClosePresentation(); -> X didn't lose importance -> new projects like MAS Questions? x.org xfree86.org xwin.org man x Josef Spillner <[email protected]>, May 2003.

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