XdbeGetVisualInfo man page on FreeBSD

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XdbeGetVisualInfo(3)		  X FUNCTIONS		  XdbeGetVisualInfo(3)

       XdbeGetVisualInfo - Get dbe Visual Informations

       #include <X11/extensions/Xdbe.h>

       XdbeScreenVisualInfo *XdbeGetVisualInfo(
	   Display  *dpy,
	   Drawable *screen_specifiers,
	   int	    *num_screens)

       This  function  returns	information about which visuals support double
       buffering.  The argument num_screens specifies how many elements	 there
       are  in the screen_specifiers list.  Each drawable in screen_specifiers
       designates  a  screen  for  which  the  supported  visuals  are	 being
       requested.   If	num_screens  is	 zero,	information for all screens is
       requested.  In this case, upon return from this	function,  num_screens
       will  be	 set  to  the  number of screens that were found.  If an error
       occurs, this function returns NULL, else it returns a pointer to a list
       of XdbeScreenVisualInfo structures of length num_screens.  The nth ele‐
       ment in the returned list  corresponds  to  the	nth  drawable  in  the
       screen_specifiers list, unless num_screens was passed in with the value
       zero, in which case the nth element in the returned list corresponds to
       the  nth	 screen	 of  the server, starting with screen zero.  The Xdbe‐
       ScreenVisualInfo structure has the following fields:

	    int		   count
	    XdbeVisualInfo *visinfo

       count specifies the number of items in visinfo.	 visinfo  specifies  a
       list of visuals, depths, and performance hints for this screen.

       The XdbeVisualInfo structure has the following fields:

	    VisualID visual
	    int	     depth
	    int	     perflevel

       visual  specifies  one visual ID that supports double-buffering.	 depth
       specifies the depth of the visual.  perflevel is a performance hint.

       The only operation defined on a perflevel is comparison to a  perflevel
       of  another  visual  on	the same screen.  The visual having the higher
       perflevel is likely to have better  double-buffering  graphics  perfor‐
       mance  than  the	 visual	 having	 the  lower perflevel.	Nothing can be
       deduced from the following: the magnitude of the difference of two per‐
       flevels,	 a  perflevel value in isolation, or comparing perflevels from
       different servers.

	      One or more values passed in screen_specifiers is	 not  a	 valid

       DBE,  XdbeAllocateBackBufferName(),  XdbeBeginIdiom(),  XdbeDeallocate‐
       BackBufferName(),  XdbeEndIdiom(),  XdbeFreeVisualInfo(),  XdbeGetBack‐
       BufferAttributes(), XdbeQueryExtension(), XdbeSwapBuffers().

X Version 11			 libXext 1.1.1		  XdbeGetVisualInfo(3)

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