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CentOS 7.0 - man page for xclearwindow (centos section 3)

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XClearArea(3)				  XLIB FUNCTIONS			    XClearArea(3)

NAME
       XClearArea, XClearWindow - clear area or window

SYNTAX
       int XClearArea(Display *display, Window w, int x, int y, unsigned width, unsigned height,
	      Bool exposures);

       int XClearWindow(Display *display, Window w);

ARGUMENTS
       display	 Specifies the connection to the X server.

       exposures Specifies a Boolean value that indicates if Expose events are to be generated.

       w	 Specifies the window.

       width
       height	 Specify the width and height, which are the dimensions of the rectangle.

       x
       y	 Specify the x and y coordinates, which are relative to the origin of the window
		 and specify the upper-left corner of the rectangle.

DESCRIPTION
       The XClearArea function paints a rectangular area in the specified window according to the
       specified dimensions with the window's background pixel or pixmap.  The subwindow-mode
       effectively is ClipByChildren.  If width is zero, it is replaced with the current width of
       the window minus x.  If height is zero, it is replaced with the current height of the win-
       dow minus y.  If the window has a defined background tile, the rectangle clipped by any
       children is filled with this tile.  If the window has background None, the contents of the
       window are not changed.	In either case, if exposures is True, one or more Expose events
       are generated for regions of the rectangle that are either visible or are being retained
       in a backing store.  If you specify a window whose class is InputOnly, a BadMatch error
       results.

       XClearArea can generate BadMatch, BadValue, and BadWindow errors.

       The XClearWindow function clears the entire area in the specified window and is equivalent
       to XClearArea (display, w, 0, 0, 0, 0, False).  If the window has a defined background
       tile, the rectangle is tiled with a plane-mask of all ones and GXcopy function.	If the
       window has background None, the contents of the window are not changed.	If you specify a
       window whose class is InputOnly, a BadMatch error results.

       XClearWindow can generate BadMatch and BadWindow errors.

DIAGNOSTICS
       BadMatch  An InputOnly window is used as a Drawable.

       BadValue  Some numeric value falls outside the range of values accepted by the request.
		 Unless a specific range is specified for an argument, the full range defined by
		 the argument's type is accepted.  Any argument defined as a set of alternatives
		 can generate this error.

       BadWindow A value for a Window argument does not name a defined Window.

SEE ALSO
       XCopyArea(3)
       Xlib - C Language X Interface

X Version 11				   libX11 1.6.0 			    XClearArea(3)
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