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.TH DMXGetScreenAttributes __libmansuffix__ __vendorversion__

.SH NAME

DMXGetScreenAttributes \- determine back-end screen attributes

.SH SYNOPSIS

.B #include <X11/extensions/dmxext.h>

.sp

.nf

.BI "Bool DMXGetScreenAttributes(Display " *dpy ,

.BI "                            int " screen ,

.BI "                            DMXScreenAttributes " *attr );

.fi

.SH DESCRIPTION

.B DMXGetScreenAttributes()

returns the attributes for the single DMX screen specified in

.IR screen .

.PP

The

.I DMXScreenAttributes

structure is:

.sp

.nf

typedef struct {

    char         *displayName;

    int          logicalScreen;

    unsigned int screenWindowWidth;

    unsigned int screenWindowHeight;

    int          screenWindowXoffset;

    int          screenWindowYoffset;

    unsigned int rootWindowWidth;

    unsigned int rootWindowHeight;

    int          rootWindowXoffset;

    int          rootWindowYoffset;

    int          rootWindowXorigin;

    int          rootWindowYorigin;

} DMXScreenAttributes;

.fi

.PP

.I displayName

is the name used to open the display, either from the

.BR Xdmx (1)

command-line or from the configuration file.

.PP

.I logicalScreen

is the value of the screen that that

.BR Xdmx (1)

server exports to clients.  When Xinerama is in use, this value is

typically 0 for all values of physicalScreen.  If Xinerama is in

use,

.I rootWindowXorigin

and

.I rootWindowYorigin

specify where the physical screen is positioned in the global Xinerama

coordinate system.  Otherwise, these values are set to 0.

.PP

.IR screenWindowWidth ", " screenWindowHeight ", "

.IR screenWindowXoffset ", and " screenWindowYoffset

are a geometry specification (see

.BR X (7x))

for the location of the DMX screen on the back-end screen.  The

coordinate system of the back-end display is used for these values.

.PP

.IR rootWindowWidth ", " rootWindowHeight ", "

.IR rootWindowXoffset ", and " rootWindowYoffset

are a geometry specification (see

.BR X (7x))

for the location of the root window on the screen window.  The

coordinate system of the screen window is used.  In most cases, the root

window will have the same geometry as the DMX screen window, and will

occupy the same area of the back-end display.  (This would not be the

case, for example, if automatic projector alignment is used.)

.SH "RETURN VALUE"

.B DMXGetScreenAttributes()

returns

.B True

unless there is a protocol error.

.PP

.B DMXGetScreenAttributes()

can generate

.B BadValue

errors.

.SH "SEE ALSO"

.BR DMXGetScreenCount "(__libmansuffix__), "

.BR DMXChangeScreensAttributes "(__libmansuffix__), "

.BR DMX "(__libmansuffix__), " Xdmx (1)