oracular (3) XPresentQueryVersion.3.gz

NAME

       Xpresent - X Present Extension

SYNTAX

       #include <X11/extensions/Xpresent.h>

       Bool XPresentQueryExtension (Display *dpy, int *major_opcode_return,
            int *event_base_return, int *error_base_return);

       Status XPresentQueryVersion (Display *dpy,
            int *major_version_return,
            int *minor_version_return);

       int XPresentVersion (void);

ARGUMENTS

       dpy       Specifies the connection to the X server.

DESCRIPTION

       Xpresent  is  a  library designed to interface the X Present Extension.  The Present extension provides a
       way for applications to  update  their  window  contents  from  a  pixmap  in  a  well  defined  fashion,
       synchronizing  with the display refresh and potentially using a more efficient mechanism than copying the
       contents of the source pixmap.  The XPresentQueryExtension function checks if the X server  specified  by
       dpy  supports  the  X Present extension.  If the server does not support the extension, it returns False.
       If the server does support the extension, it returns True, and sets the  values  of  major_opcode_return,
       event_base_return, and error_base_return if the pointers are not NULL.

       Clients  must call the XPresentQueryExtension function to verify the server supports the extension before
       calling any other function for this extension.  The XPresentQueryVersion function sets the values pointed
       to  by  major_version_return  and minor_version_return to the version of the extension supported by the X
       server specified by dpy.  The XPresentQueryVersion  function  returns  the  version  of  the  libXpresent
       library in use, as defined by the PRESENT_VERSION macro in <X11/extensions/Xpresent.h>.

SEE ALSO

       XPresentNotifyMSC(3), XPresentPixmap(3), XPresentQueryCapabilities(3), XPresentSelectInput(3)

RESTRICTIONS

       Xpresent will remain upward compatible after the 1.0 release.

AUTHORS

       Keith Packard, Intel