XdbeSwapBuffers man page on QNX

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XdbeSwapBuffers(3)		  X FUNCTIONS		    XdbeSwapBuffers(3)

       XdbeSwapBuffers - swaps front and back DBE buffers.

       #include <X11/extensions/Xdbe.h>

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

       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_action 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:

	      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.

	      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.

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

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

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

	      An invalid window was specified.

	      An invalid swap action was specified.

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

X Version 11			 libXext 1.1.1		    XdbeSwapBuffers(3)
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