XMaxRequestSize man page on DigitalUNIX

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AllPlanes(3X11)						       AllPlanes(3X11)

       AllPlanes,  BlackPixel,	WhitePixel, ConnectionNumber, DefaultColormap,
       DefaultDepth,  XListDepths,  DefaultGC,	 DefaultRootWindow,   Default‐
       ScreenOfDisplay,	 DefaultScreen,	 DefaultVisual, DisplayCells, Display‐
       Planes, DisplayString, XMaxRequestSize, XExtendedMaxRequestSize,	 Last‐
       KnownRequestProcessed,  NextRequest, ProtocolVersion, ProtocolRevision,
       QLength, RootWindow, ScreenCount, ScreenOfDisplay,  ServerVendor,  Ven‐
       dorRelease - Display macros and functions


       BlackPixel(display, screen_number)

       WhitePixel(display, screen_number)


       DefaultColormap(display, screen_number)

       DefaultDepth(display, screen_number)

       int *XListDepths(display, screen_number, count_return)
	       Display *display;
	       int screen_number;
	       int *count_return;

       DefaultGC(display, screen_number)




       DefaultVisual(display, screen_number)

       DisplayCells(display, screen_number)

       DisplayPlanes(display, screen_number)


       long XMaxRequestSize(display)
	       Display *display;

       long XExtendedMaxRequestSize(display)
	       Display *display;






       RootWindow(display, screen_number)


       ScreenOfDisplay(display, screen_number)



       Specifies  the  connection  to the X server.  Specifies the appropriate
       screen number on the host server.  Returns the number of depths.

       The AllPlanes macro returns a value with all bits set to 1 suitable for
       use in a plane argument to a procedure.

       The  BlackPixel	macro  returns the black pixel value for the specified

       The WhitePixel macro returns the white pixel value  for	the  specified

       The  ConnectionNumber  macro returns a connection number for the speci‐
       fied display.

       The DefaultColormap macro returns the default colormap ID  for  alloca‐
       tion on the specified screen.

       The  DefaultDepth  macro	 returns  the  depth (number of planes) of the
       default root window for the specified screen.

       The XListDepths function returns the array of depths that are available
       on  the	specified  screen. If the specified screen_number is valid and
       sufficient memory for the array	can  be	 allocated,  XListDepths  sets
       count_return  to the number of available depths. Otherwise, it does not
       set count_return and returns NULL. To release the memory allocated  for
       the array of depths, use XFree.

       The  DefaultGC  macro returns the default GC for the root window of the
       specified screen.

       The DefaultRootWindow macro returns the root  window  for  the  default

       The  DefaultScreenOfDisplay  macro  returns  the	 default screen of the
       specified display.

       The DefaultScreen macro returns the default screen number referenced in
       the XOpenDisplay routine.

       The  DefaultVisual macro returns the default visual type for the speci‐
       fied screen.

       The DisplayCells macro returns the number of  entries  in  the  default

       The  DisplayPlanes  macro  returns  the depth of the root window of the
       specified screen.

       The DisplayString macro returns the string that was passed to XOpenDis‐
       play when the current display was opened.

       The  XMaxRequestSize  function  returns	the  maximum  request size (in
       4-byte units) supported by the server without using an  extended-length
       protocol	 encoding.  Single  protocol  requests to the server can be no
       larger than this size unless an extended-length	protocol  encoding  is
       supported  by  the  server.  The	 protocol guarantees the size to be no
       smaller than 4096 units (16384 bytes). Xlib automatically  breaks  data
       up into multiple protocol requests as necessary for the following func‐
       tions: XDrawPoints, XDrawRectangles, XDrawSegments,  XFillArcs,	XFill‐
       Rectangles, and XPutImage.

       The XExtendedMaxRequestSize function returns zero if the specified dis‐
       play does not support an extended-length protocol encoding;  otherwise,
       it  returns the maximum request size (in 4-byte units) supported by the
       server using the extended-length encoding. The  Xlib  functions	XDraw‐
       Lines,  XDrawArcs,  XFillPolygon,  XChangeProperty, XSetClipRectangles,
       and XSetRegion will use the extended-length encoding as	necessary,  if
       supported  by the server.  Use of the extended-length encoding in other
       Xlib functions (for example,  XDrawPoints,  XDrawRectangles,  XDrawSeg‐
       ments,  XFillArcs,  XFillRectangles,  XPutImage)	 is  permitted but not
       required; an Xlib implementation may choose to split  the  data	across
       multiple smaller requests instead.

       The  LastKnownRequestProcessed macro extracts the full serial number of
       the last request known by Xlib to have been processed by the X server.

       The NextRequest macro extracts the full serial number  that  is	to  be
       used for the next request.

       The  ProtocolVersion macro returns the major version number (11) of the
       X protocol associated with the connected display.

       The ProtocolRevision macro returns the minor protocol  revision	number
       of the X server.

       The  QLength  macro  returns the length of the event queue for the con‐
       nected display.

       The RootWindow macro returns the root window.

       The ScreenCount macro returns the number of available screens.

       The ScreenOfDisplay macro returns a pointer to the screen of the speci‐
       fied display.

       The  ServerVendor  macro	 returns a pointer to a null-terminated string
       that provides some identification of the owner of the X	server	imple‐

       The  VendorRelease macro returns a number related to a vendor's release
       of the X server.

       BlackPixelOfScreen(3X11),   ImageByteOrder(3X11),    IsCursorKey(3X11),

       Xlib -- C Language X Interface


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