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+.\" $XFree86$
+.\"
+.\" Copyright 2004 Red Hat Inc., Durham, North Carolina.
+.\" All Rights Reserved.
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation on the rights to use, copy, modify, merge,
+.\" publish, distribute, sublicense, and/or sell copies of the Software,
+.\" and to permit persons to whom the Software is furnished to do so,
+.\" subject to the following conditions:
+.\"
+.\" he above copyright notice and this permission notice (including the
+.\" next paragraph) shall be included in all copies or substantial
+.\" portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+.\" NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+.\" BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+.\" ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+.\" CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+.\" SOFTWARE.
+.TH DMXChangeDesktopAttributes 3X __vendorversion__
+.SH NAME
+DMXChangeDesktopAttributes \- change global bounding box
+.SH SYNOPSIS
+.B #include <X11/extensions/dmxext.h>
+.sp
+.nf
+.BI "int DMXChangeDesktopAttributes(Display " *dpy ,
+.BI "                               unsigned int " mask ,
+.BI "                               DMXDesktopAttributes " *attr );
+.fi
+.SH DESCRIPTION
+.B DMXChangeDesktopAttributes()
+resizes the bounding box of the whole screen when using the Xinerama
+extension.  Otherwise, it has no effect on the screen layout.
+An attribute mask is placed in
+.I mask
+and the attributes to change are placed in
+.IR attr .
+.PP
+The values that are used to compute
+.I mask
+are as follows:
+.sp
+.nf
+DMXDesktopWidth
+DMXDesktopHeight
+DMXDesktopShiftX
+DMXDesktopShiftY
+.fi
+.PP
+The
+.B DMXDesktopAttributes
+structure is:
+.sp
+.nf
+typedef struct {
+    unsigned int width;
+    unsigned int height;
+    int          shiftX;
+    int          shiftY;
+} DMXDesktopAttributes;
+.fi
+.PP
+.I width " and " height
+specify the new width and height for the bounding box.
+.I shiftX " and " shiftY
+specify where the Xinerama origin will be placed with respect to the
+origin of the new bounding box.  This allows the left and upper edges of
+the bounding box to be changed without changing the visual position of
+the windows on the desktop.  If
+.I width " or " height
+is not specified, the current values will be used.  If
+.I shiftX " or " shiftY
+is not specified, 0 will be used.
+.PP
+All coordinants are in the global DMX coordinant system.  If Xinerama is
+not active, an error will be generated.
+.SH "RETURN VALUE"
+.B DMXChangeDesktopAttributes()
+will return 0 on success,
+.B DmxBadXinerama
+if Xinerama is not active,
+.B DmxBadValue
+if the size of the bounding box is too large, and
+.B DmxBadReply
+if there was a protocol error.
+.PP
+.B DMXChangeDesktopAttributes()
+can generate
+.B BadLength
+(if the request is malformed, which should never happen when using this
+library interface), and
+.B BadValue
+(if any values are out of range).
+.SH "SEE ALSO"
+.BR DMXGetDesktopAttributes "(3X), " DMX "(3X), " Xdmx (1)