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XdbeSwapBuffers(3)		  X FUNCTIONS		    XdbeSwapBuffers(3)

NAME
       XdbeSwapBuffers - swaps front and back DBE buffers.

SYNOPSIS
       #include	<X11/extensions/Xdbe.h>

       Status XdbeSwapBuffers(
	   Display	*dpy,
	   XdbeSwapInfo	*swap_info,
	   int		num_windows)

DESCRIPTION
       This  function  swaps the front and back	buffers	for a list of windows.
       The argument num_windows	specifies how many windows are to  have	 their
       buffers	swapped;  it is	the number of elements in the swap_info	array.
       The argument swap_info specifies	the information	needed per  window  to
       do the swap.

       The XdbeSwapInfo	structure has the following fields:

	    Window	      swap_window
	    XdbeSwapAction    swap_action

       swap_window  specifies  the window for which to swap buffers.  swap_ac-
       tion specifies the swap action to use for this swap_window.

       swap_action determines what will	happen to the new back buffer  of  the
       swap_window it is paired	with in	the list in addition to	making the old
       back buffer become visible.  The	defined	actions	are as follows:

       XdbeUndefined
	      The  contents of the new back buffer become undefined.  This may
	      be the most efficient action since it allows the	implementation
	      to discard the contents of the buffer if it needs	to.

       XdbeBackground
	      The  unobscured region of	the new	back buffer will be tiled with
	      the window background.  The background action allows devices  to
	      use a fast clear capability during a swap.

       XdbeUntouched
	      The  unobscured region of	the new	back buffer will be unmodified
	      by the swap.

       XdbeCopied
	      The unobscured region of the new back buffer will	 be  the  con-
	      tents of the old back buffer

ERRORS
       BadMatch
	      A	non-double-buffered window was specified or a window was spec-
	      ified twice.

       BadWindow
	      An invalid window	was specified.

       BadValue
	      An invalid swap action was specified.

SEE ALSO
       DBE,  XdbeAllocateBackBufferName(),  XdbeBeginIdiom(),  XdbeDeallocate-
       BackBufferName(),  XdbeEndIdiom(),  XdbeFreeVisualInfo(),  XdbeGetBack-
       BufferAttributes(), XdbeGetVisualInfo(),	XdbeQueryExtension().

X Version 11			 libXext 1.3.6		    XdbeSwapBuffers(3)

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