hpux man page for xdisplayplanes

XDisplayPlanes()														  XDisplayPlanes()

Name
  XDisplayPlanes, DisplayPlanes - get number of planes of specified screen.

Synopsis
  int XDisplayPlanes(display, screen_number)
	   Display *display;
	   int screen_number;

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

  screen_number
	    Specifies the appropriate screen number on the host server.

Returns
  The number of planes.

Description
  XDisplayPlanes() returns the depth (number of planes or number of bits per pixel) of the root window of the specified screen.

  The C language macro DisplayPlanes() is equivalent and slightly more efficient.

  This function is misnamed; it should really be XScreenPlanes().

See Also
  XDefaultDepth*(), XDefaultDepthOfScreen().

Xlib - Macro Equivalents													  XDisplayPlanes()