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XUnionRectWithRegion()					XUnionRectWithRegion()

Name
  XUnionRectWithRegion – add a rectangle to a region.

Synopsis
  XUnionRectWithRegion(rectangle, src_region, dest_region_return)
	  XRectangle *rectangle;
	  Region src_region;
	  Region dest_region_return;

Arguments
  rectangle Specifies the rectangle to add to the region.

  src_region
	    Specifies the source region to be used.

  dest_region_return
	    Specifies	the   resulting	 region.   May	be  the	 same  as
	    src_region.

Description
  XUnionRectWithRegion() computes the destination region from a union  of
  the  specified  rectangle  and the specified source region.  The source
  and destination regions may be the same.

  One common application of this function is to simplify the combining of
  the  rectangles  specified in contiguous Expose events into a clip_mask
  in the GC, thus restricting the redrawn areas to  the	 exposed  rectan‐
  gles.	  Use  XUnionRectWithRegion()  to  combine  the rectangle in each
  Expose event into a region, then call XSetRegion().  XSetRegion()  sets
  the  clip_mask  in  a	 GC  to the region.  In this case, src_region and
  dest_region_return would be the same region.

  If  src_region  and  dest_region_return  are	not  the   same	  region,
  src_region  is  copied  to  dest_region_return  before the rectangle is
  added to dest_region_return.

  For more information on regions, see Volume  One,  Chapter  6,  Drawing
  Graphics and Text.

Structures
     typedef struct {
	 short x, y;
	 unsigned short width, height;
     } XRectangle;

  Region is a pointer to an opaque data type.

See Also
  XClipBox(),  XDestroyRegion(),  XEmptyRegion(), XEqualRegion(), XInter‐
  sectRegion(),	 XOffsetRegion(),   XPointInRegion(),	XPolygonRegion(),
  XRectInRegion(),   XSetRegion(),   XShrinkRegion(),  XSubtractRegion(),
  XUnionRegion(), XXorRegion().

Xlib - Resource Manager					XUnionRectWithRegion()

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