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