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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 DMXChangeScreensAttributes 3X __vendorversion__
+.SH NAME
+DMXChangeScreensAttributes \- change back-end screen attributes
+.SH SYNOPSIS
+.B #include <X11/extensions/dmxext.h>
+.sp
+.nf
+.BI "int DMXChangeScreensAttributes(Display " *dpy ,
+.BI "                               int " screen_count ,
+.BI "                               int " *screens ,
+.BI "                               int " mask_count ,
+.BI "                               unsigned int " *masks ,
+.BI "                               DMXScreenAttributes " *attr ,
+.BI "                               int *" error_screen );
+.fi
+.SH DESCRIPTION
+.B DMXChangeScreensAttributes()
+changes the geometries and positions of the DMX screen and DMX root
+windows on the back-end X servers.
+.I screen_count
+specifies the number of screens to be changed.  For each screen, the
+screen number is placed in
+.IR screens ,
+an attribute mask is placed in
+.IR masks ,
+and a
+.I DMXScreenAttributes
+structure is included in
+.IR attr .
+.PP
+An explanation of the
+.I DMXScreenAttributes
+structure is given in
+.BR DMXGetScreenAttributes (3X).
+.PP
+The values that are used to compute each value in
+.I masks
+are as follows
+.sp
+.nf
+DMXScreenWindowWidth
+DMXScreenWindowHeight
+DMXScreenWindowXoffset
+DMXScreenWindowYoffset
+DMXRootWindowWidth
+DMXRootWindowHeight
+DMXRootWindowXoffset
+DMXRootWindowYoffset
+DMXRootWindowXorigin
+DMXRootWindowYorigin
+.fi
+.PP
+In general,
+.I mask_count
+should be equal to
+.IR screen_count .
+However, as a convenience,
+.I mask_count
+may be less than
+.IR screen_count ,
+and the last entry in
+.I masks
+will then be used for all of the remaining screens.  For example, this
+allows identical changes to be made to several screens using only one
+mask.
+.SH "RETURN VALUE"
+On success, 0 is returned.  Otherwise,
+.I error_screen
+is set to the value of the first screen in the list that caused the
+error and a non-zero value is returned.  If
+.I screen_count
+or
+.I mask_count
+is less than 1, or if any of the attribute values are not within the
+appropriate bounding boxes,
+.B DmxBadValue
+is returned.  If a protocol error occurs,
+.B DmxBadReply
+is returned.
+.PP
+.B DMXChangeScreensAttributes()
+can generate
+.B BadLength
+(if the data provided does not match the data implicitly required by the
+.I screen_count
+and
+.I mask_count
+values),
+.B BadValue
+(if the values in
+.I screens
+are not valid), and
+.B BadAlloc
+errors.
+.SH "SEE ALSO"
+.BR DMXGetScreenCount "(3X), "
+.BR DMXGetScreenAttributes "(3X), "
+.BR DMX "(3X), " Xdmx (1)