xdbegetvisualinfo(3) [centos man page]

XdbeGetVisualInfo(3)						    X FUNCTIONS 					      XdbeGetVisualInfo(3)

NAME

       XdbeGetVisualInfo - Get dbe Visual Informations

SYNOPSIS

       #include <X11/extensions/Xdbe.h>

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

DESCRIPTION

       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 element 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  corre-
       sponds to the nth screen of the server, starting with screen zero.  The XdbeScreenVisualInfo 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 performance than the visual  having  the  lower  perflevel.   Nothing  can	be
       deduced from the following: the magnitude of the difference of two perflevels, a perflevel value in isolation, or comparing perflevels from
       different servers.

ERRORS

       BadDrawable
	      One or more values passed in screen_specifiers is not a valid drawable.

SEE ALSO

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

X Version 11							   libXext 1.3.2					      XdbeGetVisualInfo(3)

Check Out this Related Man Page

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 1.3.1						XdbeSwapBuffers(3)

Linux and UNIX Man Pages

xdbegetvisualinfo(3) [centos man page]

Check Out this Related Man Page