Xlib â C Language X Interface

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Xlib − C LibraryX11, Release 6.7 DRAFTchar *XLookUpAssoc(display, table, x_id)Display *display;XAssocTable *table;XID x_id;displaytablex_idSpecifies the connection to the X server.Specifies the assoc table.Specifies the X resource ID.The XLookUpAssoc function retrieves the data stored in an XAssocTable by its XID. If anappropriately matching XID can be found in the table, XLookUpAssoc returns the data associatedwith it. If the x_id cannot be found in the table, it returns NULL.To delete an entry from a given XAssocTable, use XDeleteAssoc.XDeleteAssoc (display, table, x_id)Display *display;XAssocTable *table;XID x_id;displaytablex_idSpecifies the connection to the X server.Specifies the assoc table.Specifies the X resource ID.The XDeleteAssoc function deletes an association in an XAssocTable keyed on its XID. Redundantdeletes (and deletes of nonexistent XIDs) are ignored. Deleting associations in no wayimpairs the performance of an XAssocTable.To free the memory associated with a given XAssocTable, use XDestroyAssocTable.XDestroyAssocTable (table)XAssocTable *table;tableSpecifies the assoc table.473
Xlib − C LibraryX11, Release 6.7 DRAFTGlossaryAccess control listXmaintains a list of hosts from which client programs can be run. By default, only programson the local host and hosts specified in an initial list read by the server can use thedisplay. This access control list can be changed by clients on the local host. Some serverimplementations can also implement other authorization mechanisms in addition to or inplace of this mechanism. The action of this mechanism can be conditional based on theauthorization protocol name and data received bythe server at connection setup.Active grabAncestorsAtomAgrab is active when the pointer or keyboard is actually owned by the single grabbingclient.If W is an inferior of A, then A is an ancestor of W.An atom is a unique ID corresponding to a string name. Atoms are used to identify properties,types, and selections.BackgroundAn InputOutput window can have a background, which is defined as a pixmap. Whenregions of the window have their contents lost or invalidated, the server automatically tilesthose regions with the background.Backing storeWhen a server maintains the contents of a window, the pixels saved off-screen are known asabacking store.Base font nameBit gravityAfont name used to select a family of fonts whose members may be encoded in variouscharsets. The CharSetRegistry and CharSetEncoding fields of an XLFD name identifythe charset of the font. Abase font name may be a full XLFD name, with all fourteen ’-’delimiters, or an abbreviated XLFD name containing only the first 12 fields of an XLFDname, up to but not including CharSetRegistry, with or without the thirteenth ’-’, or anon-XLFD name. Any XLFD fields may contain wild cards.When creating an XFontSet, Xlib accepts from the client a list of one or more base fontnames which select one or more font families. They are combined with charset namesobtained from the encoding of the locale to load the fonts required to render text.When a window isresized, the contents of the window are not necessarily discarded. It ispossible to request that the server relocate the previous contents to some region of the window(though no guarantees are made). This attraction of window contents for some locationof a window isknown as bit gravity.474
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AcknowledgmentsThe design and imple
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Release 6Stephen Gildea (X Consorti
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Xlib − C LibraryX11, Release 6.7
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Page 427 and 428: Xlib − C LibraryX11, Release 6.7
Page 477: Xlib − C LibraryX11, Release 6.7
Page 495 and 496: 4.2. Translating Screen Coordinates
Page 497 and 498: 10.7. Input Focus Events . . . . .
Page 499 and 500: 13.5.6.1. Input Style . . . . . . .
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