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Misc. Reference Manual Pages XRANDR(3xrandr)

NAME

Xrandr - X Resize, Rotate and Reflection extension.

SYNTAX

cc [ flag... ] file... -lXrandr [ library... ]

#include

Bool XRRQueryExtension (Display *dpy,

int *event_base_return, int *error_base_return);

Status XRRQueryVersion (Display *dpy,

int *major_version_return,

int *minor_version_return);

XRRScreenConfiguration *XRRGetScreenInfo (Display *dpy, Drawable draw); void XRRFreeScreenConfigInfo ( XRRScreenConfiguration *config); Status XRRSetScreenConfig (Display *dpy, XRRScreenConfiguration *config, Drawable draw,

int size_index,

Rotation rotation, Time timestamp); Status XRRSetScreenConfigAndRate (Display *dpy, XRRScreenConfiguration *config, Drawable draw,

int size_index,

Rotation rotation, short rate, Time timestamp); Rotation XRRConfigRotations( XRRScreenConfiguration *config,

Rotation *current_rotation);

Time XRRConfigTimes ( XRRScreenConfiguration *config,

Time *config_timestamp);

XRRScreenSize *XRRConfigSizes( XRRScreenConfiguration *config, int *nsizes); short *XRRConfigRates ( XRRScreenConfiguration *config,

int size_index,

int *nrates); X Version 11 Last change: libXrandr 1.3.0 1 Misc. Reference Manual Pages XRANDR(3xrandr) SizeID XRRConfigCurrentConfiguration ( XRRScreenConfiguration *config, Rotation *rotation); short XRRConfigCurrentRate ( XRRScreenConfiguration *config);

int XRRRootToScreen(

Display *dpy, Window root); void XRRSelectInput(Display *dpy, Window window, int mask); /* * intended to take RRScreenChangeNotify, or * ConfigureNotify (on the root window) * returns 1 if it is an event type it understands, 0 if not */ int XRRUpdateConfiguration(XEvent *event^); /* * the following are always safe to call, even if RandR is * not implemented on a screen */ Rotation XRRRotations( Display *dpy, int screen,

Rotation *current_rotation);

XRRScreenSize *XRRSizes(Display *dpy, int screen, int *nsizes); short *XRRRates (Display *dpy, int screen,

int size_index, int *nrates);

Time XRRTimes (Display *dpy, int screen, Time *config_timestamp);

ARGUMENTS display Specifies the connection to the X server. screen Specifies which screen. draw Specifies the screen. rotation Specifies the rotations or reflections possible of the screen.

current_rotation

Specifies the current rotations and reflection of the screen. timestamp Specifies the server timestamp. X Version 11 Last change: libXrandr 1.3.0 2 Misc. Reference Manual Pages XRANDR(3xrandr)

config_timestamp

Specifies the timestamp when the screen was last (re)configured. config Specifies the screen configuration being used. sizes Specifies the array of sizes supported. rate Specifies the refresh rate in Hz. DATATYPES

Rotations/Reflections Can be any of:

#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; XRRScreenSize structure contains a possible root size in pixels and in millimeters. XRRScreenChangeNotifyEvent Is X Version 11 Last change: libXrandr 1.3.0 3 Misc. Reference Manual Pages XRANDR(3xrandr) sent to a client that has requested notification whenever the screen configuration is changed.

XRRScreenConfiguration This is an opaque data type contain-

ing the configuration information for a screen. Timestamps 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.

DESCRIPTION

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 per-

formance if rotation and reflection are implemented in this fashion (as are all implementations as of October 2002). 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, miti-

gating 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.

Rotation and reflection and how they interact can be confus-

ing. In Randr, the coordinate system is rotated in a

counter-clockwise direction relative to the normal orienta-

tion. Reflection is along the window system coordinate sys-

tem, 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. The XRRScreenChangeNotify event is sent to clients that ask to be informed whenever the root window configuration

changes. Configuration changes may include resolution, phy-

sical 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 X Version 11 Last change: libXrandr 1.3.0 4 Misc. Reference Manual Pages XRANDR(3xrandr)

monitor/flat panel display being hot-plugged) and is not

only the result of a protocol/library request to the X server. Additionally, to eliminate a potential race condition, this

event may be generated immediately upon selecting for notif-

ication if the screen has changed since the client of Xrandr

connected to the X server, to enable reliable screen resolu-

tion changing when a user may log in and change the confi-

guration while one or many clients are starting up. Xlib notification

Clients must call back into Xlib using XRRUpdateConfigura-

tion when screen configuration change notify events are gen-

erated (or root window configuration changes occur, to update Xlib's view of the resolution, size, rotation,

reflection or subpixel order. Generally, toolkits will per-

form 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 condi-

tions might occur. Toolkits should provide clients some mechanism for notification of screen change, of course. 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 exten-

sion is not present. 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. 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 sup-

ported, it returns 0 for the number of sizes. 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. 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 configura-

tion will fail until the client has an up to date timestamp. X Version 11 Last change: libXrandr 1.3.0 5 Misc. Reference Manual Pages XRANDR(3xrandr)

XRRRootToScreen returns the screen number given a root win-

dow (for example, from an XRRScreenChangeNotifyEvent. The rest of the functions will fail if applied to screens not implementing the RandR extension. XRRSetScreenConfig sets the screen size and rotation and reflection to the desired values on the screen specified by draw, or returns a

BadValue error. size_index specifies which size configura-

tion is to be used, rotation specifies which rotation or reflection is to be used (or a BadValue error is returned). The timestamp 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 XRRGetScreenInfo). XRRSetScreenConfigAndRate like XRRSetScreenConfig but also set the refresh rate. If specified rate is not supported a BadValue error is returned.

XRRConfigRotations, XRRConfigSizes, XRRConfigCurrentConfi-

guration, XRRConfigTimes, XRRConfigRates, and XRRCon-

figCurrentRate are used to get specific configuration infor-

mation out of a screen configuration. XRRGetScreenInfo Returns a screen configuration for later use; the information is private to the library. Call XRRFreeScreenConfigInfo to free this information when you are finished with it. It forces a round trip to the server. Other functions include: XRRQueryExtension which returns the event and error base codes, XRRQueryVersion , which

returns the current version of the extension (this informa-

tion is cached by the library). RESTRICTIONS Xrandr will remain upward compatible after the current 1.0 release. AUTHOR Jim Gettys, and Keith Packard, HP.

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes: X Version 11 Last change: libXrandr 1.3.0 6 Misc. Reference Manual Pages XRANDR(3xrandr)

____________________________________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

|_____________________________|_____________________________|

| Availability | x11/library/libxrandr |

|_____________________________|_____________________________|

| Interface Stability | Volatile |

|_____________________________|_____________________________|

| MT-Level | See XInitThreads(3X11) |

|_____________________________|_____________________________|

X Version 11 Last change: libXrandr 1.3.0 7