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XSetClipOrigin(3)


NAME

   XSetClipOrigin, XSetClipMask, XSetClipRectangles - GC convenience
   routines

SYNTAX

   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);

ARGUMENTS

   display   Specifies the connection to the X server.

   clip_x_origin
   clip_y_origin
             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.

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

DESCRIPTION

   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-origin).

   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.

DIAGNOSTICS

   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.

SEE ALSO

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



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