xdbequeryextension(3x11) [redhat man page]

XdbeQueryExtension(3X11)					    X FUNCTIONS 					  XdbeQueryExtension(3X11)

NAME

       XdbeQueryExtension - returns the version of DBE supported by the server.

SYNOPSIS

       #include <X11/extensions/Xdbe.h>

       Status XdbeQueryExtension(
	   Display *dpy,
	   int	   *major_version_return,
	   int	   *minor_version_return)

DESCRIPTION

       Sets major_version_return and minor_version_return to the major and minor DBE protocol version supported by the server.	If the DBE library
       is compatible with the version returned by the server, this function returns non-zero.  If dpy does not support the DBE	extension,  or	if
       there  was  an  error  during communication with the server, or if the server and library protocol versions are incompatible, this function
       returns zero.  No other Xdbe functions may be called before this function.  If a client violates this rule, the effects of  all	subsequent
       Xdbe calls that it makes are undefined.

SEE ALSO

       DBE,  XdbeAllocateBackBufferName(),  XdbeBeginIdiom(),  XdbeDeallocateBackBufferName(),	XdbeEndIdiom(), XdbeFreeVisualInfo(), XdbeGetBack-
       BufferAttributes(), XdbeGetVisualInfo(), XdbeSwapBuffers().

X Version 11							    Release 6.6 					  XdbeQueryExtension(3X11)

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_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:

       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 contents of the old back buffer

ERRORS

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

       BadWindow
	      An invalid window was specified.

       BadValue
	      An invalid swap action was specified.

SEE ALSO

       DBE, XdbeAllocateBackBufferName(), XdbeBeginIdiom(),  XdbeDeallocateBackBufferName(),  XdbeEndIdiom(),  XdbeFreeVisualInfo(),  XdbeGetBack-
       BufferAttributes(), XdbeGetVisualInfo(), XdbeQueryExtension().

X Version 11							   libXext 1.3.2						XdbeSwapBuffers(3)