347 lines
12 KiB
Groff
347 lines
12 KiB
Groff
.\"
|
|
.\" $XFree86: xc/lib/Xrandr/Xrandr.man,v 1.7 2003/08/04 10:32:21 eich Exp $
|
|
.\" $XdotOrg: xc/lib/Xrandr/Xrandr.man,v 1.2 2004/04/23 18:43:47 eich Exp $
|
|
.\"
|
|
.\" Copyright 2002 Hewlett-Packard Company.\"
|
|
.\" Permission to use, copy, modify, distribute, and sell this software and its
|
|
.\" documentation for any purpose is hereby granted without fee, provided that
|
|
.\" the above copyright notice appear in all copies and that both that
|
|
.\" copyright notice and this permission notice appear in supporting
|
|
.\" documentation, and that the name of Hewlett-Packard Company not be used in
|
|
.\" advertising or publicity pertaining to distribution of the software without
|
|
.\" specific, written prior permission. Hewlett Packard Company makes no
|
|
.\" representations about the suitability of this software for any purpose. It
|
|
.\" is provided "as is" without express or implied warranty.
|
|
.\"
|
|
.\" Hewlett-Packard DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
.\" INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
.\" EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
.\" CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
|
|
.\" DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
.\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
.\" PERFORMANCE OF THIS SOFTWARE.
|
|
.\"
|
|
.de TQ
|
|
.br
|
|
.ns
|
|
.TP \\$1
|
|
..
|
|
.TH XRANDR __libmansuffix__ __vendorversion__
|
|
|
|
.SH NAME
|
|
Xrandr \- X Resize, Rotate and Reflection extension.
|
|
.SH SYNTAX
|
|
\&#include <X11/extensions/Xrandr.h>
|
|
.nf
|
|
.sp
|
|
Bool XRRQueryExtension \^(\^Display *\fIdpy\fP,
|
|
int *\fIevent_base_return\fP, int *\fIerror_base_return\fP\^);
|
|
.sp
|
|
Status XRRQueryVersion \^(\^Display *\fIdpy\fP,
|
|
int *\fImajor_version_return\fP,
|
|
int *\fIminor_version_return\fP\^);
|
|
.sp
|
|
XRRScreenConfiguration *XRRGetScreenInfo \^(\^Display *dpy,
|
|
Drawable \fIdraw\fP\^);
|
|
.sp
|
|
void XRRFreeScreenConfigInfo \^(\^
|
|
\fIXRRScreenConfiguration *config\fP\^);
|
|
.sp
|
|
Status XRRSetScreenConfig \^(\^Display *\fIdpy\fP,
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
Drawable \fIdraw\fP,
|
|
int \fIsize_index\fP,
|
|
Rotation \fIrotation\fP,
|
|
Time \fItimestamp\fP\^);
|
|
.sp
|
|
Status XRRSetScreenConfigAndRate \^(\^Display *\fIdpy\fP,
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
Drawable \fIdraw\fP,
|
|
int \fIsize_index\fP,
|
|
Rotation \fIrotation\fP,
|
|
short \fIrate\fP,
|
|
Time \fItimestamp\fP\^);
|
|
.sp
|
|
Rotation XRRConfigRotations\^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
Rotation *\fIcurrent_rotation\fP\^);
|
|
.sp
|
|
Time XRRConfigTimes \^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
Time *\fIconfig_timestamp\fP\^);
|
|
.sp
|
|
XRRScreenSize *XRRConfigSizes\^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
int *\fInsizes\fP\^);
|
|
.sp
|
|
short *XRRConfigRates \^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
int \fIsize_index\fP,
|
|
int *\fInrates\fP\^);
|
|
.sp
|
|
SizeID XRRConfigCurrentConfiguration \^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP,
|
|
Rotation *\fIrotation\fP\^);
|
|
.sp
|
|
short XRRConfigCurrentRate \^(\^
|
|
XRRScreenConfiguration *\fIconfig\fP\^);
|
|
.sp
|
|
int XRRRootToScreen\^(\^
|
|
Display *\fIdpy\fP,
|
|
Window \fIroot\fP\^);
|
|
.sp
|
|
void XRRSelectInput\^(\^Display *\fIdpy\fP, Window \fIwindow\fP, int \fImask\fP\^);
|
|
.sp
|
|
/\(**
|
|
* intended to take RRScreenChangeNotify, or
|
|
* ConfigureNotify \^(\^\fIon the root window\fP\^)
|
|
* returns 1 if it is an event type it understands, 0 if not
|
|
*/
|
|
int XRRUpdateConfiguration\^(\^XEvent *\fIevent\fP^);
|
|
.sp
|
|
/\(**
|
|
* the following are always safe to call, even if RandR is
|
|
* not implemented on a screen
|
|
*/
|
|
.br
|
|
Rotation XRRRotations\^(\^
|
|
Display *\fIdpy\fP, int \fIscreen\fP,
|
|
Rotation *\fIcurrent_rotation\fP\^);
|
|
.sp
|
|
XRRScreenSize *XRRSizes\^(\^Display *\fIdpy\fP,
|
|
int \fIscreen\fP, int *\fInsizes\fP\^);
|
|
.sp
|
|
short *XRRRates \^(\^Display *\fIdpy\fP, int \fIscreen\fP,
|
|
int \fIsize_index\fP, int *\fInrates\fP\^);
|
|
.sp
|
|
Time XRRTimes \^(\^Display *\fIdpy\fP, int \fIscreen\fP, Time *\fIconfig_timestamp\fP\^);
|
|
.fi
|
|
.SH ARGUMENTS
|
|
.IP \fIdisplay\fP 1i
|
|
Specifies the connection to the X server.
|
|
.IP \fIscreen\fP 1i
|
|
Specifies which screen.
|
|
.IP \fIdraw\fP 1i
|
|
Specifies the screen.
|
|
.IP \fIrotation\fP 1i
|
|
Specifies the rotations or reflections possible of the screen.
|
|
.IP \fIcurrent_rotation\fP 1i
|
|
Specifies the current rotations and reflection of the screen.
|
|
.IP \fItimestamp\fP 1i
|
|
Specifies the server timestamp.
|
|
.IP \fIconfig_timestamp\fP 1i
|
|
Specifies the timestamp when the screen was last (re)configured.
|
|
.IP \fIconfig\fP 1i
|
|
Specifies the screen configuration being used.
|
|
.IP \fIsizes\fP 1i
|
|
Specifies the array of sizes supported.
|
|
.IP \fIrate\fP 1i
|
|
Specifies the refresh rate in Hz.
|
|
|
|
.SH DATATYPES
|
|
|
|
.PP
|
|
.B Rotations/Reflections
|
|
.PP
|
|
Can be any of:
|
|
.nf
|
|
\&#define RR_Rotate_0 1
|
|
\&#define RR_Rotate_90 2
|
|
\&#define RR_Rotate_180 4
|
|
\&#define RR_Rotate_270 8
|
|
|
|
/\(** new in 1.0 protocol, to allow reflection of screen */
|
|
/\(** reflection is applied after rotation */
|
|
|
|
\&#define RR_Reflect_X 16
|
|
\&#define RR_Reflect_Y 32
|
|
|
|
|
|
typedef struct {
|
|
int width, height;
|
|
int mwidth, mheight;
|
|
} XRRScreenSize;
|
|
|
|
typedef struct {
|
|
int type; /\(** event base */
|
|
unsigned long serial; /\(** # of last request processed by server */
|
|
Bool send_event; /\(** true if this came from a SendEvent request */
|
|
Display *display; /\(** Display the event was read from */
|
|
Window window; /\(** window which selected for this event */
|
|
Window root; /\(** Root window for changed screen */
|
|
Time timestamp; /\(** when the screen change occurred */
|
|
Time config_timestamp; /\(** when the last configuration change */
|
|
SizeID size_index;
|
|
SubpixelOrder subpixel_order;
|
|
Rotation rotation;
|
|
int width;
|
|
int height;
|
|
int mwidth;
|
|
int mheight;
|
|
} XRRScreenChangeNotifyEvent;
|
|
.sp
|
|
.fi
|
|
.B XRRScreenSize
|
|
structure contains a possible root size in pixels and in millimeters.
|
|
.B XRRScreenChangeNotifyEvent
|
|
Is sent to a client that has requested notification whenever the screen
|
|
configuration is changed.
|
|
|
|
.B XRRScreenConfiguration
|
|
This is an opaque data type containing the configuration information
|
|
for a screen.
|
|
|
|
.B Timestamps
|
|
.PP
|
|
Time stamps are included and must be used to ensure the client is playing
|
|
with a full deck: the screen may change properties
|
|
on the fly and this ensures its knowledge of the configuration is up to date.
|
|
This is to help issues when screens may become hot-pluggable in the future.
|
|
|
|
.SH DESCRIPTION
|
|
.B Xrandr
|
|
is a simple library designed to interface the X Resize and Rotate
|
|
Extension. This allows clients to change the size and rotation of the
|
|
root window of a screen, along with the ability to reflect the screen
|
|
about either axis (if supported by the implementation). Rotation and
|
|
reflection may be implemented by software and may result in slower
|
|
performance if rotation and reflection are implemented in this fashion
|
|
(as are all implementations as of October 2002).
|
|
.PP
|
|
The Xrandr library does some minimal caching to avoid roundtrips to
|
|
provide clients frequently used information. See "The X Resize and
|
|
Rotate Extension" for a detailed description; also note that depth
|
|
switching, as described in the document is not implemented, and may
|
|
(or may not) ever be implemented, as display memory is growing rapidly,
|
|
and toolkits are already beginning to support migration, mitigating the
|
|
need for depth switching. If it is implemented in the future, we
|
|
expect to do so via an upward compatible extension to the
|
|
current library/protocol; functionality described here should continue
|
|
to work.
|
|
.PP
|
|
Rotation and reflection and how they interact can be confusing. In
|
|
Randr, the coordinate system is rotated in a counter-clockwise
|
|
direction relative to the normal orientation. Reflection is along the
|
|
window system coordinate system, not the physical screen X and Y axis,
|
|
so that rotation and reflection do not interact. The other way to
|
|
consider reflection is to is specified in the "normal" orientation,
|
|
before rotation, if you find the other way confusing.
|
|
.PP
|
|
The
|
|
.B XRRScreenChangeNotify
|
|
event is sent to clients that ask to be informed whenever the root window
|
|
configuration changes. Configuration changes may include resolution,
|
|
physical size, subpixel order (see XRender(3)), and rotation. Note
|
|
that changes to any or all of these could occur due to external events
|
|
(user control in the X server, a different monitor/flat panel display
|
|
being hot-plugged) and is not only the result of a protocol/library
|
|
request to the X server.
|
|
.PP
|
|
Additionally, to eliminate a potential race condition,
|
|
this event may be generated
|
|
immediately upon selecting for notification if the screen has changed
|
|
since the client of Xrandr connected to the X server, to enable
|
|
reliable screen resolution changing when a user may log in and
|
|
change the configuration while one or many clients are starting up.
|
|
.PP
|
|
.B Xlib notification
|
|
.PP
|
|
Clients must call back into Xlib using
|
|
.B XRRUpdateConfiguration
|
|
when screen configuration change notify events are generated
|
|
(or root window configuration changes occur, to update Xlib's
|
|
view of the resolution, size, rotation, reflection or subpixel order.
|
|
Generally, toolkits will perform this operation on behalf of applications;
|
|
we did not want to change display structure data behind the back of toolkits,
|
|
as in multithreaded clients, various race conditions might occur.
|
|
Toolkits should provide clients some mechanism for notification of
|
|
screen change, of course.
|
|
|
|
.SH FUNCTIONS
|
|
There are two classes of interfaces: those which can be safely called
|
|
even if RandR is not implemented on a screen (to make common idioms not
|
|
dependent on the server having support), and those which will return
|
|
errors if the extension is not present.
|
|
.PP
|
|
.B XRRRotations
|
|
returns both the possible set of rotations/reflections supported
|
|
(as a bitmask) as the value of the function, along with the current
|
|
rotation/reflection of the screen.
|
|
.PP
|
|
.B XRRSizes
|
|
returns the size and a pointer to the current sizes supported by
|
|
the specified screen. The first size specified is the default size
|
|
of the server. If RandR is not supported, it returns 0 for
|
|
the number of sizes.
|
|
.PP
|
|
.B XRRRates
|
|
returns a pointer to a the rates supported by the specified size.
|
|
If RandR is not supported, it returns 0 for the number of rates.
|
|
.PP
|
|
.B XRRTimes
|
|
returns the time last reported by the server along with the
|
|
timestamp the last configuration changed.
|
|
If the configuration has changed since the client last updated
|
|
its view of the server time, requests to change the configuration
|
|
will fail until the client has an up to date timestamp.
|
|
.PP
|
|
.B XRRRootToScreen
|
|
returns the screen number given a root window (for example, from
|
|
an \fBXRRScreenChangeNotifyEvent\fI.
|
|
.PP
|
|
The rest of the functions will fail if applied to screens not
|
|
implementing the RandR extension.
|
|
.B XRRSetScreenConfig
|
|
sets the screen size and rotation and reflection to the desired
|
|
values on the screen specified by \fIdraw\fP, or returns a
|
|
.B BadValue
|
|
error.
|
|
\fIsize_index\fP specifies which size configuration is to be used,
|
|
\fIrotation\fP specifies which rotation or reflection is to
|
|
be used (or a
|
|
.B BadValue
|
|
error is returned).
|
|
The \fItimestamp\fP is used by the server to make sure the client
|
|
has up to date configuration information. Status is returned
|
|
to indicate success or failure; a client must refresh its configuration
|
|
information if it fails and try the call again (by calling
|
|
\fBXRRGetScreenInfo\fP).
|
|
.PP
|
|
.B XRRSetScreenConfigAndRate
|
|
like
|
|
.B XRRSetScreenConfig
|
|
but also set the refresh rate. If specified rate is not supported a
|
|
.B BadValue
|
|
error is returned.
|
|
.PP
|
|
.B XRRConfigRotations,
|
|
.B XRRConfigSizes,
|
|
.B XRRConfigCurrentConfiguration,
|
|
.B XRRConfigTimes,
|
|
.B XRRConfigRates,
|
|
and
|
|
.B XRRConfigCurrentRate
|
|
are used to get specific configuration information out of a screen
|
|
configuration.
|
|
.PP
|
|
.B XRRGetScreenInfo
|
|
Returns a screen configuration for later use; the information is
|
|
private to the library.
|
|
Call
|
|
.B XRRFreeScreenConfigInfo
|
|
to free this information when you are finished with it.
|
|
It forces a round trip to the server.
|
|
|
|
Other functions include:
|
|
.B XRRQueryExtension
|
|
which returns the event and error base codes,
|
|
.B XRRQueryVersion
|
|
, which returns the current version of the extension (this information
|
|
is cached by the library).
|
|
.SH RESTRICTIONS
|
|
.B Xrandr
|
|
will remain upward compatible after the current 1.0 release.
|
|
.SH AUTHOR
|
|
Jim Gettys, and Keith Packard, HP.
|
|
|