xdoes(3) [hpux man page]

XDoes*()																  XDoes*()

Name
  XDoesBackingStore, XDoesSaveUnders, DoesBackingStore, DoesSaveUnders - query server support for backing store or save unders.

Synopsis
  int XDoesBackingStore(screen)
	   Screen *screen;
  Bool XDoesSaveUnders(screen)
	   Screen *screen;

Arguments
  screen    Specifies the appropriate Screen structure.

Returns
  XDoesSaveUnders() returns True or False.  XDoesBackingStore() returns WhenMapped, NotUseful, or Always.

Description
  XDoesSaveUnders()  returns  a  boolean value indicating whether the screen supports save unders.  If True, the screen supports save unders.
  If False, the screen does not support save unders.

  XDoesBackingStore() returns a value indicating whether the screen supports backing stores.  The value returned can be  one  of  WhenMapped,
  NotUseful, or Always.

  Save	unders	and  backing stores are optional server features controlled with window attributes.  These macros tell you whether the server
  supports them.  A "save under" is an area beneath a window (usually a menu or dialog box) that the server saves, so that when the window is
  removed  from the screen, the underlying applications do not need to redraw their windows.  This speeds up user response with a slight cost
  in increased server memory consumption.  A "backing store" is an off-screen copy of a window, maintained even when the window is not	visi-
  ble or not mapped.  The server uses the copy to redraw the window whenever that window would otherwise have received an Expose event.  This
  reduces the load on applications at the expense of a possibly great increase in server memory usage.

  The C language macros DoesSaveUnders() and DoesBackingStore() are equivalent and slightly more efficient.

See Also
  XChangeWindowAttributes(), XGetWindowAttributes().

Xlib - Macro Equivalents														  XDoes*()

BlackPixelOfScreen(3)						  XLIB FUNCTIONS					     BlackPixelOfScreen(3)

NAME

       BlackPixelOfScreen, WhitePixelOfScreen, CellsOfScreen, DefaultColormapOfScreen, DefaultDepthOfScreen, DefaultGCOfScreen, DefaultVisualOf-
       Screen, DoesBackingStore, DoesSaveUnders, DisplayOfScreen, XScreenNumberOfScreen, EventMaskOfScreen, HeightOfScreen, HeightMMOfScreen, Max-
       CmapsOfScreen, MinCmapsOfScreen, PlanesOfScreen, RootWindowOfScreen, WidthOfScreen, WidthMMOfScreen - screen information functions and
       macros

SYNTAX

       unsigned long BlackPixelOfScreen(Screen *screen);

       unsigned long WhitePixelOfScreen(Screen *screen);

       int CellsOfScreen(Screen *screen);

       Colormap DefaultColormapOfScreen(Screen *screen);

       int DefaultDepthOfScreen(Screen *screen);

       GC DefaultGCOfScreen(Screen *screen);

       Visual *DefaultVisualOfScreen(Screen *screen);

       int DoesBackingStore(Screen *screen);

       Bool DoesSaveUnders(Screen *screen);

       Display *DisplayOfScreen(Screen *screen);

       int XScreenNumberOfScreen(Screen *screen);

       long EventMaskOfScreen(Screen *screen);

       int HeightOfScreen(Screen *screen);

       int HeightMMOfScreen(Screen *screen);

       int MaxCmapsOfScreen(Screen *screen);

       int MinCmapsOfScreen(Screen *screen);

       int PlanesOfScreen(Screen *screen);

       Window RootWindowOfScreen(Screen *screen);

       int WidthOfScreen(Screen *screen);

       int WidthMMOfScreen(Screen *screen);

ARGUMENTS

       screen	 Specifies the appropriate Screen structure.

DESCRIPTION

       The BlackPixelOfScreen macro returns the black pixel value of the specified screen.

       The WhitePixelOfScreen macro returns the white pixel value of the specified screen.

       The CellsOfScreen macro returns the number of colormap cells in the default colormap of the specified screen.

       The DefaultColormapOfScreen macro returns the default colormap of the specified screen.

       The DefaultDepthOfScreen macro returns the default depth of the root window of the specified screen.

       The DefaultGCOfScreen macro returns the default GC of the specified screen, which has the same depth as the root window of the screen.

       The DefaultVisualOfScreen macro returns the default visual of the specified screen.

       The DoesBackingStore macro returns WhenMapped, NotUseful, or Always, which indicate whether the screen supports backing stores.

       The DoesSaveUnders macro returns a Boolean value indicating whether the screen supports save unders.

       The DisplayOfScreen macro returns the display of the specified screen.

       The XScreenNumberOfScreen function returns the screen index number of the specified screen.

       The EventMaskOfScreen macro returns the root event mask of the root window for the specified screen at connection setup.

       The HeightOfScreen macro returns the height of the specified screen.

       The HeightMMOfScreen macro returns the height of the specified screen in millimeters.

       The MaxCmapsOfScreen macro returns the maximum number of installed colormaps supported by the specified screen.

       The MinCmapsOfScreen macro returns the minimum number of installed colormaps supported by the specified screen.

       The PlanesOfScreen macro returns the number of planes in the root window of the specified screen.

       The RootWindowOfScreen macro returns the root window of the specified screen.

       The WidthOfScreen macro returns the width of the specified screen.

       The WidthMMOfScreen macro returns the width of the specified screen in millimeters.

SEE ALSO

       AllPlanes(3), ImageByteOrder(3), IsCursorKey(3)
       Xlib - C Language X Interface

X Version 11							   libX11 1.6.0 					     BlackPixelOfScreen(3)