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X11R7.4 - man page for xcompositeversion (x11r4 section 3)

XCOMPOSITE(3)				   X Version 11 			    XCOMPOSITE(3)

       Xcomposite - X Composite Extension library

       #include <X11/extensions/Xcomposite.h>

       Bool XCompositeQueryExtension(Display *dpy, int *event_basep, int *error_basep);

       Status XCompositeQueryVersion(Display *dpy, int *major_versionp, int *minor_versionp);

       int XCompositeVersion(void);

       void XCompositeRedirectWindow(Display *dpy, Window window, int update);

       void XCompositeRedirectSubwindows(Display *dpy, Window window, int update);

       void XCompositeUnredirectWindow(Display *dpy, Window window, int update);

       void XCompositeUnredirectSubwindows(Display *dpy, Window window, int update);

       XserverRegion XCompositeCreateRegionFromBorderClip(Display *dpy, Window window);

       Pixmap XCompositeNameWindowPixmap(Display *dpy, Window window);

       Window XCompositeGetOverlayWindow(Display *dpy, Window window);

       void XCompositeReleaseOverlayWindow(Display *dpy, Window window);

       The composite extension provides several related mechanisms:

       Per-hierarchy storage
	   The rendering of an entire hierarchy of windows is redirected to off-screen storage.
	   The pixels of that hierarchy are available whenever it is viewable. Storage is
	   automatically reallocated when the top level window changes size. Contents beyond the
	   geometry of the top window are not preserved.

       Automatic shadow update
	   When a hierarchy is rendered off-screen, the X server provides an automatic mechanism
	   for presenting those contents within the parent window. The implementation is free to
	   make this update lag behind actual rendering operations by an unspecified amount of
	   time. This automatic update mechanism may be disabled so that the parent window
	   contents can be completely determined by an external application.

       Composite Overlay Window
	   Version 0.3 of the protocol adds the Composite Overlay Window, which provides
	   compositing managers with a surface on which to draw without interference. This window
	   is always above normal windows and is always below the screen saver window. It is an
	   InputOutput window whose width and height are the screen dimensions. Its visual is the
	   root visual and its border width is zero. Attempts to redirect it using the composite
	   extension are ignored. This window does not appear in the reply of the QueryTree
	   request. It is also an override redirect window. These last two features make it
	   invisible to window managers and other X11 clients. The only way to access the XID of
	   this window is via the CompositeGetOverlayWindow request. Initially, the Composite
	   Overlay Window is unmapped.

       Parent window clipping
	   Version 0.4 of the protocol modifies the semantics of parent window clipping in the
	   presence of manual redirected children. With this version, the area in the parent
	   covered by manual redirected children is left in the parent clip list instead of being
	   removed as in older versions.

       Per-hierarchy storage may be created for individual windows or for all children of a
       window. Manual shadow update may be selected by only a single application for each window;
       manual update may also be selected on a per-window basis or for each child of a window.
       Detecting when to update may be done with the Damage extension.

       The off-screen storage includes the window contents, its borders and the contents of all

	   Pointer to the Display structure returned from XOpenDisplay for the connection to the
	   X server.

	   Pointer to integer where the base value for Composite Extension events will be stored.

	   Pointer to integer where the base value for Composite Extension errors will be stored.

	   Pointer to integer where the major version of the Composite Extension supported by the
	   X server will be stored.

	   Pointer to integer where the minor version of the Composite Extension supported by the
	   X server will be stored.

	   Specifies the window ID to operate on.

	   Specifies the mode for updating the window contents. Must be either
	   CompositeRedirectAutomatic or CompositeRedirectManual.


	   XCompositeQueryExtension determines if the Composite Extension is available on the
	   given display. It returns True if the extension is supported, otherwise False. If the
	   extension is present, the base values for events and errors are returned, and can be
	   used to decode incoming event and error values.


	   XCompositeQueryVersion determines if the X Server supports a version of the X
	   Composite Extension which is compatible with the client library. A non-zero Status is
	   returned if a compatible version of the extension is supported, otherwise a zero
	   Status is returned. If the extension is supported, the major and minor version numbers
	   are returned to indicate the level of Composite Extension support. No other XComposite
	   functions (except XCompositeQueryExtension) may be called before this function. If a
	   client violates this rule, the effects of all subsequent XComposite calls that it
	   makes are undefined.


	   XCompositeVersion returns the version of the X Composite library. The version number
	   is encoded as: (major * 10000) + (minor * 100) + revision

	   For example, version 1.4.6 would be encoded as the integer 10406.


	   XCompositeRedirectWindow requests the X server to direct the hierarchy starting at
	   window to off-screen storage. The update argument specifies whether the contents are
	   mirrored to the parent window automatically or not. Only one client at a time may
	   specify an update type of CompositeRedirectManual, another attempt will result in a
	   BadAccess error. When all clients enabling redirection terminate, the redirection will
	   automatically be disabled.

	   The root window may not be redirected. Doing so results in a BadMatch error.
	   Specifying an invalid window id will result in a BadWindow error.


	   XCompositeRedirectSubwindows requests the X server to redirect hierarchies starting at
	   all current and future children of window as in XCompositeRedirectWindow. If update is
	   CompositeRedirectManual, then painting of the window background during window
	   manipulation and ClearArea requests is inhibited.


	   XCompositeUnredirectWindow requests the X server to terminate redirection of window.
	   If the specified window was not selected for redirection by the current client, a
	   BadValue error results.


	   XCompositeUnredirectWindow requests the X server to terminate redirection of all
	   children of window. If the specified window was not selected for sub-redirection by
	   the current client, a BadValue error results.


	   XCompositeCreateRegionFromBorderClip creates a region containing the "usual" border
	   clip value; that is the area of the window clipped against siblings and the parent.
	   This region can be used to restrict rendering to suitable areas while updating only a
	   single window. The region is copied at the moment the request is executed; future
	   changes to the window hierarchy will not be reflected in this region.


	   XCompositeNameWindowPixmap creates and returns a pixmap id that serves as a reference
	   to the off-screen storage for window. This pixmap will remain allocated until freed,
	   even if the window is unmapped, reconfigured or destroyed. However, the window will
	   get a new pixmap allocated each time it is mapped or resized, so this function will
	   need to be reinvoked for the client to continue to refer to the storage holding the
	   current window contents. Generates a BadMatch error if window is not redirected or is
	   not visible.

	   The X server must support at least version 0.2 of the Composite Extension for


	   XCompositeGetOverlayWindow returns the window ID of the Composite Overlay Window for
	   the screen specified by the argument window. This function notifies the X server that
	   the client wishes to use the Composite Overlay Window of this screen. If this
	   Composite Overlay Window has not yet been mapped, it is mapped by this request.

	   The Composite Overlay Window for a particular screen will be unmapped when all clients
	   who have called this function have either called XCompositeReleaseOverlayWindow for
	   that screen, or terminated their connection to the X server.

	   The X server must support at least version 0.3 of the Composite Extension for

	   This request specifies that the client is no longer using the Composite Overlay Window
	   on the screen specified by the argument window. A screen's Composite Overlay Window is
	   unmapped when there are no longer any clients using it.

	   The X server must support at least version 0.3 of the Composite Extension for

       Keith Packard <keithp@keithp.com>
	   Extension specification and implementation

       Deron Johnson <deron.johnson@sun.com>
	   Overlay Window specification and implementation

libXcomposite 0.4.0		 <pubdate>23 April 2007</pubdate>		    XCOMPOSITE(3)

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