XkbAddGeomOverlayRow man page on Raspbian

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XkbAddGeomOverlayRow(3)		 XKB FUNCTIONS	       XkbAddGeomOverlayRow(3)

NAME
       XkbAddGeomOverlayRow - Add a row to an existing overlay

SYNOPSIS
       XkbOverlayRowPtr XkbAddGeomOverlayRow (XkbOverlayPtr overlay, XkbRowPtr
	      row_under, int sz_keys);

ARGUMENTS
       - overlay
	      overlay to be updated

       - row_under
	      row to be overlayed in the section overlay overlays

       - sz_keys
	      number of keys to reserve in the row

DESCRIPTION
       Xkb provides functions to add a single new  element  to	the  top-level
       keyboard	 geometry. In each case the num_ * fields of the corresponding
       structure is incremented by 1.  These  functions	 do  not  change  sz_*
       unless there is no more room in the array. Some of these functions fill
       in the values of the element's structure from the arguments. For	 other
       functions,  you must explicitly write code to fill the structure's ele‐
       ments.

       The top-level geometry description includes a list of geometry  proper‐
       ties.   A  geometry  property  associates  an  arbitrary string with an
       equally arbitrary name. Programs that display images of	keyboards  can
       use  geometry properties as hints, but they are not interpreted by Xkb.
       No other geometry structures refer to geometry properties.

       XkbAddGeomOverlayRow adds one row to the overlay.  The new row contains
       space for sz_keys keys. If row_under specifies a row that doesn't exist
       on  the	underlying  section,  XkbAddGeomOverlayRow  returns  NULL  and
       doesn't	change	the overlay.  XkbAddGeomOverlayRow returns NULL if any
       of the parameters is empty or if it was not able to allocate space  for
       the overlay.

STRUCTURES
	   typedef struct _XkbOverlayRow {
	       unsigned short	   row_under;	 /∗ index into the row under this overlay row */
	       unsigned short	   num_keys;	 /∗ number of keys in the keys array */
	       unsigned short	   sz_keys;	 /∗ size of the keys array */
	       XkbOverlayKeyPtr	   keys;	 /∗ array of keys in the overlay row */
	   } XkbOverlayRowRec,*XkbOverlayRowPtr;

X Version 11			 libX11 1.3.3	       XkbAddGeomOverlayRow(3)
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