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       XSetClipOrigin, XSetClipMask, XSetClipRectangles - GC convenience routines


       int XSetClipOrigin(Display *display, GC gc, int clip_x_origin, int clip_y_origin);

       int XSetClipMask(Display *display, GC gc, Pixmap pixmap);

       int  XSetClipRectangles(Display  *display,  GC  gc,  int clip_x_origin, int clip_y_origin,
              XRectangle rectangles[], int n, int ordering);


       display   Specifies the connection to the X server.

                 Specify the x and y coordinates of the clip-mask origin.

       gc        Specifies the GC.

       n         Specifies the number of rectangles.

       ordering  Specifies the ordering relations on the  rectangles.   You  can  pass  Unsorted,
                 YSorted, YXSorted, or YXBanded.

       pixmap    Specifies the pixmap or None.

                 Specifies an array of rectangles that define the clip-mask.


       The  XSetClipOrigin  function  sets  the  clip  origin in the specified GC.  The clip-mask
       origin is interpreted relative to the origin of whatever destination drawable is specified
       in the graphics request.

       XSetClipOrigin can generate BadAlloc and BadGC errors.

       The  XSetClipMask function sets the clip-mask in the specified GC to the specified pixmap.
       If the clip-mask is set to None, the pixels are are always drawn (regardless of the  clip-

       XSetClipMask can generate BadAlloc, BadGC, BadMatch, and BadValue errors.

       The XSetClipRectangles function changes the clip-mask in the specified GC to the specified
       list of rectangles and sets the clip origin.  The output is clipped  to  remain  contained
       within  the rectangles.  The clip-origin is interpreted relative to the origin of whatever
       destination drawable is specified in a graphics request.  The  rectangle  coordinates  are
       interpreted relative to the clip-origin.  The rectangles should be nonintersecting, or the
       graphics results will be undefined.  Note that the list of rectangles can be empty,  which
       effectively  disables  output.   This  is the opposite of passing None as the clip-mask in
       XCreateGC, XChangeGC, and XSetClipMask.

       If known by the client, ordering relations on the rectangles can  be  specified  with  the
       ordering  argument.   This  may  provide  faster operation by the server.  If an incorrect
       ordering is specified, the X server may generate a BadMatch error, but it is not  required
       to  do  so.  If no error is generated, the graphics results are undefined.  Unsorted means
       the  rectangles  are  in  arbitrary  order.   YSorted  means  that  the   rectangles   are
       nondecreasing  in  their Y origin.  YXSorted additionally constrains YSorted order in that
       all rectangles with an equal Y origin are  nondecreasing  in  their  X  origin.   YXBanded
       additionally  constrains  YXSorted  by  requiring that, for every possible Y scanline, all
       rectangles that include that scanline have an identical Y origins and Y extents.

       XSetClipRectangles can generate BadAlloc, BadGC, BadMatch, and BadValue errors.


       BadAlloc  The server failed to allocate the requested resource or server memory.

       BadGC     A value for a GContext argument does not name a defined GContext.

       BadMatch  Some argument or pair of arguments has the correct type and range but  fails  to
                 match in some other way required by the request.

       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.


       XCreateGC(3),  XDrawRectangle(3),  XQueryBestSize(3),  XSetArcMode(3),   XSetFillStyle(3),
       XSetFont(3), XSetLineAttributes(3), XSetState(3), XSetTile(3)
       Xlib - C Language X Interface