sync code with last improvements from OpenBSD
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lib/libX11/man/XIntersectRegion.man
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lib/libX11/man/XIntersectRegion.man
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided "as is" without express or implied warranty.
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.\"
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.TH XIntersectRegion __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XIntersectRegion, XUnionRegion, XUnionRectWithRegion, XSubtractRegion, XXorRegion, XOffsetRegion, XShrinkRegion \- region arithmetic
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.SH SYNTAX
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.HP
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int XIntersectRegion\^(\^Region \fIsra\fP\^, Region \fIsrb\fP\^, Region
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\fIdr_return\fP\^);
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.HP
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int XUnionRegion\^(\^Region \fIsra\fP\^, Region \fIsrb\fP\^, Region
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\fIdr_return\fP\^);
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.HP
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int XUnionRectWithRegion\^(\^XRectangle *\fIrectangle\fP\^, Region
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\fIsrc_region\fP\^, Region \fIdest_region_return\fP\^);
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.HP
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int XSubtractRegion\^(\^Region \fIsra\fP\^, Region \fIsrb\fP\^, Region
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\fIdr_return\fP\^);
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.HP
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int XXorRegion\^(\^Region \fIsra\fP\^, Region \fIsrb\fP\^, Region
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\fIdr_return\fP\^);
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.HP
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int XOffsetRegion\^(\^Region \fIr\fP\^, int \fIdx\fP\^, int \fIdy\fP\^);
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.HP
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int XShrinkRegion\^(\^Region \fIr\fP\^, int \fIdx\fP\^, int \fIdy\fP\^);
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.SH ARGUMENTS
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.IP \fIdest_region_return\fP 1i
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Returns the destination region.
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.IP \fIdr_return\fP 1i
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Returns the result of the computation.
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.IP \fIdx\fP 1i
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.br
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.ns
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.IP \fIdy\fP 1i
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Specify the x and y coordinates,
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which define the amount you want to move or shrink the specified region.
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.IP \fIr\fP 1i
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Specifies the region.
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.IP \fIrectangle\fP 1i
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Specifies the rectangle.
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.IP \fIsra\fP 1i
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.br
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.ns
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.IP \fIsrb\fP 1i
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Specify the two regions with which you want to perform the computation.
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.IP \fIsrc_region\fP 1i
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Specifies the source region to be used.
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.SH DESCRIPTION
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The
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.B XIntersectRegion
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function computes the intersection of two regions.
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.LP
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The
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.B XUnionRegion
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function computes the union of two regions.
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.LP
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The
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.B XUnionRectWithRegion
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function updates the destination region from a union of the specified rectangle
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and the specified source region.
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.LP
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The
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.B XSubtractRegion
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function subtracts srb from sra and stores the results in dr_return.
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.LP
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The
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.B XXorRegion
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function calculates the difference between the union and intersection
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of two regions.
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.LP
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The
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.B XOffsetRegion
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function moves the specified region by a specified amount.
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.LP
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The
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.B XShrinkRegion
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function reduces the specified region by a specified amount.
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Positive values shrink the size of the region,
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and negative values expand the region.
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.SH "SEE ALSO"
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XCreateRegion(__libmansuffix__),
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XDrawRectangle(__libmansuffix__),
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XEmptyRegion(__libmansuffix__)
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.br
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\fI\*(xL\fP
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