XClearArea, XClearWindow - clear area or window
int XClearArea(Display *display, Window w, int
x, int y, unsigned width, unsigned height, Bool
exposures);
int XClearWindow(Display *display, Window w);
- 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.
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 window 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.
- 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.
XCopyArea(3)
Xlib - C Language X Interface