XkbAddGeomOverlay man page on aLinux

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XkbAddGeomOverlay(3)		 XKB FUNCTIONS		  XkbAddGeomOverlay(3)

NAME
       XkbAddGeomOverlay - Add one overlay to a section

SYNOPSIS
       XkbOverlayPtr XkbAddGeomOverlay ( section, name, sz_rows )
	     XkbSectionPtr section;
	     Atom name;
	     int sz_rows;

ARGUMENTS
       - section
	      section to which an overlay will be added

       - name name of the overlay

       - sz_rows
	      number of rows to reserve in the overlay

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.

       XkbAddGeomOverlay adds an overlay with the specified name to the speci‐
       fied section.  The new overlay is  created  with	 space	allocated  for
       sz_rows	rows.  If an overlay with name name already exists in the sec‐
       tion, a pointer to the existing overlay is returned.  XkbAddGeomOverlay
       returns NULL if any of the parameters is empty or if it was not able to
       allocate space for the overlay. To allocate space for an arbitrary num‐
       ber of overlays to a section, use the XkbAllocGeomOverlay function.

STRUCTURES
	   typedef struct _XkbOverlayRec {
	       Atom		     name;	      /∗ overlay name */
	       XkbSectionPtr	     section_under;   /∗ the section under this overlay */
	       unsigned short	     num_rows;	      /∗ number of rows in the rows array */
	       unsigned short	     sz_rows;	      /∗ size of the rows array */
	       XkbOverlayRowPtr	     rows;	      /∗ array of rows in the overlay */
	       XkbBoundsPtr	     bounds;	      /∗ bounding box for the overlay */
	   } XkbOverlayRec,*XkbOverlayPtr;

SEE ALSO
       XkbAllocGeomOverlay(3)

X Version 11			  libX11 1.2		  XkbAddGeomOverlay(3)
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