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.TH DMXChangeDesktopAttributes __libmansuffix__ __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 coordinates are in the global DMX coordinate 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 "(__libmansuffix__), " DMX "(__libmansuffix__), " Xdmx (1)