# XTEST Extension Library

X Consortium Standard
X Version 11, Release &fullrelvers;
Version 2.2
Kieron
Drake
UniSoft Ltd.
1992
UniSoft Group Ltd.

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## Overview

This extension is a minimal set of client and server extensions required to completely test the X11 server with no user intervention.

This extension is not intended to support general journaling and playback of user actions. This is a difficult area [XTrap, 89] as it attempts to synchronize synthetic user interactions with their effects; it is at the higher level of dialogue recording/playback rather than at the strictly lexical level. We are interested only in the latter, simpler, case. A more detailed discussion and justification of the extension functionality is given in [Drake, 91].

We are aiming only to provide a minimum set of facilities that solve immediate testing and validation problems. The testing extension itself needs testing, where possible, and so should be as simple as possible.

We have also tried to:

- Confine the extension to an appropriate high level within the server to minimize portability problems. In practice this means that the extension should be at the DIX level or use the DIX/DDX interface, or both. This has effects, in particular, on the level at which "input synthesis" can occur.

- Minimize the changes required in the rest of the server.

- Minimize performance penalties on normal server operation.

## Description

The functions provided by this extension fall into two groups:

- Client Operations

  These routines manipulate otherwise hidden client-side behavior. The actual implementation will depend on the details of the actual language binding and what degree of request buffering, GContext caching, and so on, is provided. In the C binding, defined in section 7, routines are provided to access the internals of two opaque data structures - GCs and `Visual`s - and to discard any requests pending within the output buffer of a connection. The exact details can be expected to differ for other language bindings.

- Server Requests

  The first of these requests is similar to that provided in most extensions: it allows a client to specify a major and minor version number to the server and for the server to respond with major and minor versions of its own. The remaining two requests allow the following:

- - Access to an otherwise "write-only" server resource: the cursor associated with a given window

  - Perhaps most importantly, limited synthesis of input device events, almost as if a cooperative user had moved the pointing device or pressed a key or button.

## C Language Binding

The C functions either provide direct access to the protocol and add no additional semantics to those defined in section 5 or they correspond directly to the abstract descriptions of client operations in section 4.

All XTEST extension functions and procedures, and all manifest constants and macros, will start with the string "XTest". All operations are classified as server/client (Server) or client-only (Client). All routines that have return type Status will return nonzero for "success" and zero for "failure." Even if the XTEST extension is supported, the server may withdraw such facilities arbitrarily; in which case they will subsequently return zero.

The include file for this extension is <X11/extensions/XTest.h>.

    Bool XTestQueryExtension
    Display *display
    int *event_base
    int *error_base
    int *major_version
    int *minor_version

returns `True` if the specified display supports the XTEST extension, else `False` If the extension is supported, *event_base would be set to the event number for the first event for this extension and *error_base would be set to the error number for the first error for this extension. As no errors or events are defined for this version of the extension, the values returned here are not defined (nor useful). If the extension is supported, *major_version and *minor_version are set to the major and minor version numbers of the extension supported by the display. Otherwise, none of the arguments are set.

    Bool XTestCompareCursorWithWindow
    Display *display
    Window *window
    Cursor cursor

If the extension is supported, performs a comparison of the cursor whose ID is specified by cursor (which may be `None` with the cursor of the window specified by window returning `True` if they are the same and `False` otherwise. If the extension is not supported, then the request is ignored and zero is returned.

    BoolXTestCompareCurrentCursorWithWindow
    Display *display
    Window window

If the extension is supported, performs a comparison of the current cursor with the cursor of the specified window returning `True` if they are the same and `False` otherwise. If the extension is not supported, then the request is ignored and zero is returned.

    XTestFakeKeyEvent
    Display *display
    unsigned int keycode
    Bool is_press
    unsigned long delay

If the extension is supported, requests the server to simulate either a `KeyPress` (if is_press is `True` or a `KeyRelease` (if is_press is `False` of the key with the specified keycode; otherwise, the request is ignored.

If the extension is supported, the simulated event will not be processed until delay milliseconds after the request is received (if delay is `CurrentTime` then this is interpreted as no delay at all). No other requests from this client will be processed until this delay, if any, has expired and subsequent processing of the simulated event has been completed.

    XTestFakeButtonEvent
    Display *display
    unsigned int button
    Bool is_press
    unsigned long delay

If the extension is supported, requests the server to simulate either a `ButtonPress` (if is_press is `True` or a `ButtonRelease` (if is_press is `False` of the logical button numbered by the specified button; otherwise, the request is ignored.

If the extension is supported, the simulated event will not be processed until delay milliseconds after the request is received (if delay is `CurrentTime` then this is interpreted as no delay at all). No other requests from this client will be processed until this delay, if any, has expired and subsequent processing of the simulated event has been completed.

    XTestFakeMotionEvent
    Display *display
    int screen_number
    int x
    int y
    unsigned long delay

If the extension is supported, requests the server to simulate a movement of the pointer to the specified position (x, y) on the root window of screen_number; otherwise, the request is ignored. If screen_number is -1, the current screen (that the pointer is on) is used.

If the extension is supported, the simulated event will not be processed until delay milliseconds after the request is received (if delay is `CurrentTime` then this is interpreted as no delay at all). No other requests from this client will be processed until this delay, if any, has expired and subsequent processing of the simulated event has been completed.

    XTestFakeRelativeMotionEvent
    Display *display
    int screen_number
    int x
    int y
    unsigned long delay

If the extension is supported, requests the server to simulate a movement of the pointer by the specified offsets (x, y) relative to the current pointer position on screen_number; otherwise, the request is ignored. If screen_number is -1, the current screen (that the pointer is on) is used.

If the extension is supported, the simulated event will not be processed until delay milliseconds after the request is received (if delay is `CurrentTime` then this is interpreted as no delay at all). No other requests from this client will be processed until this delay, if any, has expired and subsequent processing of the simulated event has been completed.

    XTestGrabControl
    Display *display
    Bool impervious

If impervious is `True` then the executing client becomes impervious to server grabs. If impervious is `False` then the executing client returns to the normal state of being susceptible to server grabs.

    Bool XTestSetGContextOfGC
    GC gc
    GContext gid

sets the GContext within the opaque datatype referenced by gc to be that specified by gid.

    XTestSetVisualIDOfVisual
    Visual *visual
    VisualID visualid

sets the VisualID within the opaque datatype referenced by visual to be that specified by visualid.

    Bool XTestDiscard
    Display *display

discards any requests within the output buffer for the specified display. It returns `True` if any requests were discarded; otherwise, it returns `False`

## References

Annicchiarico, D., et al., XTrap: The XTrap Architecture. Digital Equipment Corporation, July 1991.

Drake, K. J., Some Proposals for a Minimum X11 Testing Extension. UniSoft Ltd., June 1991.