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<book id="xtestlib">

<bookinfo>
   <title>XTEST Extension Library</title>
   <subtitle>X Consortium Standard</subtitle>
   <releaseinfo>X Version 11, Release &fullrelvers;</releaseinfo>
   <releaseinfo>Version 2.2</releaseinfo>
   <authorgroup>
      <author>
         <firstname>Kieron</firstname><surname>Drake</surname>
         <affiliation><orgname>UniSoft Ltd.</orgname></affiliation>
      </author>
   </authorgroup>
   <copyright><year>1992</year><holder>UniSoft Group Ltd.</holder></copyright>

<legalnotice>
<para>
Permission to use, copy, modify, and distribute this documentation for
any purpose and without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.  UniSoft
makes no representations about the suitability for any purpose of the
information in this document.  This documentation is provided
&ldquo;as is&rdquo; without express or implied warranty.
</para>
</legalnotice>

<legalnotice>
<para role="multiLicensing">Copyright © 1992,1994 X Consortium</para>
<para>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files
(the &ldquo;Software&rdquo;), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following
conditions:
</para>
<para>
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
</para>
<para>
THE SOFTWARE IS PROVIDED &ldquo;AS IS&rdquo;, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN
NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
</para>
<para>
Except as contained in this notice, the name of the X Consortium shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
</para>
<para>X Window System is a trademark of The Open Group.</para>
</legalnotice>
</bookinfo>

<chapter id='Overview'>
<title>Overview</title>

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

<para>
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].
</para>

<para>
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.
</para>

<para>We have also tried to:</para>
<itemizedlist mark='bullet'>
  <listitem>
    <para>
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.
    </para>
  </listitem>
  <listitem>
    <para>
Minimize the changes required in the rest of the server.
    </para>
  </listitem>
  <listitem>
    <para>
Minimize performance penalties on normal server operation.
    </para>
  </listitem>
</itemizedlist>
</chapter>

<chapter id='Description'>
<title>Description</title>

<para>The functions provided by this extension fall into two groups:</para>

<itemizedlist>
    <listitem>
      <para>Client Operations</para>
      <para>
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 -
<symbol role='Pn'>GC</symbol>s
and
<function>Visual</function>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.
      </para>
    </listitem>
    <listitem>
      <para>Server Requests</para>
      <para>
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:
      </para>
    </listitem>
    <listitem>
      <itemizedlist>
        <listitem>
          <para>
Access to an otherwise "write-only" server resource: the
cursor associated with a given window
          </para>
        </listitem>
        <listitem>
          <para>
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.
          </para>
        </listitem>
      </itemizedlist>
    </listitem>
</itemizedlist>
</chapter>

<chapter id='C_Language_Binding'>
<title>C Language Binding</title>

<para>
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.
</para>

<para>
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.
</para>

<para>
The include file for this extension is
&lt;<symbol role='Pn'>X11/extensions/XTest.h</symbol>&gt;.
</para>

<funcsynopsis id='XTestQueryExtension'>
<funcprototype>
<funcdef>Bool<function> XTestQueryExtension</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>int<parameter> *event_base</parameter></paramdef>
<paramdef>int<parameter> *error_base</parameter></paramdef>
<paramdef>int<parameter> *major_version</parameter></paramdef>
<paramdef>int<parameter> *minor_version</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>
<xref linkend='XTestQueryExtension' xrefstyle='select: title'/>
returns
<function>True</function>
if the specified display supports the XTEST extension, else
<function>False</function>
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.
</para>

<funcsynopsis id='XTestCompareCursorWithWindow'>
<funcprototype>
<funcdef>Bool<function> XTestCompareCursorWithWindow</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>Window<parameter> *window</parameter></paramdef>
<paramdef>Cursor<parameter> cursor</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If the extension is supported,
<xref linkend='XTestCompareCursorWithWindow' xrefstyle='select: title'/>
performs a comparison of the cursor whose ID is specified by cursor (which
may be
<function>None</function>
with the cursor of the window specified by window returning
<function>True</function>
if they are the same and
<function>False</function>
otherwise.  If the extension is not supported, then the request is ignored and
zero is returned.
</para>

<funcsynopsis id='XTestCompareCurrentCursorWithWindow'>
<funcprototype>
<funcdef>Bool<function>XTestCompareCurrentCursorWithWindow</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>Window<parameter> window</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If the extension is supported,
<xref linkend='XTestCompareCurrentCursorWithWindow' xrefstyle='select: title'/>
performs a comparison of the current cursor with the cursor of the specified
window returning
<function>True</function>
if they are the same and
<function>False</function>
otherwise.  If the extension is not supported, then the request is ignored and
zero is returned.
</para>

<funcsynopsis id='XTestFakeKeyEvent'>
<funcprototype>
<funcdef><function>XTestFakeKeyEvent</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>unsigned int<parameter> keycode</parameter></paramdef>
<paramdef>Bool<parameter> is_press</parameter></paramdef>
<paramdef>unsigned long<parameter> delay</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If the extension is supported,
<xref linkend='XTestFakeKeyEvent' xrefstyle='select: title'/>
requests the server to simulate either a
<function>KeyPress</function>
(if is_press is
<function>True</function>
or a
<function>KeyRelease</function>
(if is_press is
<function>False</function>
of the key with the specified keycode; otherwise, the request is ignored.
</para>

<para>
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
<function>CurrentTime</function>
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.
</para>

<funcsynopsis id='XTestFakeButtonEvent'>
<funcprototype>
<funcdef><function>XTestFakeButtonEvent</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>unsigned int<parameter> button</parameter></paramdef>
<paramdef>Bool<parameter> is_press</parameter></paramdef>
<paramdef>unsigned long<parameter> delay</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If the extension is supported,
<xref linkend='XTestFakeButtonEvent' xrefstyle='select: title'/>
requests the server to simulate either a
<function>ButtonPress</function>
(if is_press is
<function>True</function>
or a
<function>ButtonRelease</function>
(if is_press is
<function>False</function>
of the logical button numbered by the specified button; otherwise, the
request is ignored.
</para>

<para>If the extension is supported,
the simulated event will not be processed until delay milliseconds
after the request is received (if delay is
<function>CurrentTime</function>
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.
</para>

<funcsynopsis id='XTestFakeMotionEvent'>
<funcprototype>
<funcdef><function>XTestFakeMotionEvent</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>int<parameter> screen_number</parameter></paramdef>
<paramdef>int<parameter> x</parameter></paramdef>
<paramdef>int<parameter> y</parameter></paramdef>
<paramdef>unsigned long<parameter> delay</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If the extension is supported,
<xref linkend='XTestFakeMotionEvent' xrefstyle='select: title'/>
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.
</para>

<para>
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
<function>CurrentTime</function>
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.
</para>

<funcsynopsis id='XTestFakeRelativeMotionEvent'>
<funcprototype>
<funcdef><function>XTestFakeRelativeMotionEvent</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>int<parameter> screen_number</parameter></paramdef>
<paramdef>int<parameter> x</parameter></paramdef>
<paramdef>int<parameter> y</parameter></paramdef>
<paramdef>unsigned long<parameter> delay</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>
If the extension is supported,
<xref linkend='XTestFakeRelativeMotionEvent' xrefstyle='select: title'/>
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.
</para>

<para>
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
<function>CurrentTime</function>
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.
</para>

<funcsynopsis id='XTestGrabControl'>
<funcprototype>
<funcdef><function>XTestGrabControl</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
<paramdef>Bool<parameter> impervious</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>If impervious is
<function>True</function>
then the executing client becomes impervious to server grabs.  If impervious is
<function>False</function>
then the executing client returns to the normal state of being susceptible
to server grabs.
</para>

<funcsynopsis id='XTestSetGContextOfGC'>
<funcprototype>
<funcdef>Bool<function> XTestSetGContextOfGC</function></funcdef>
<paramdef>GC<parameter> gc</parameter></paramdef>
<paramdef>GContext<parameter> gid</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>
<xref linkend='XTestSetGContextOfGC' xrefstyle='select: title'/>
sets the GContext within the opaque datatype referenced by gc to
be that specified by gid.
</para>

<funcsynopsis id='XTestSetVisualIDOfVisual'>
<funcprototype>
<funcdef><function>XTestSetVisualIDOfVisual</function></funcdef>
<paramdef>Visual<parameter> *visual</parameter></paramdef>
<paramdef>VisualID<parameter> visualid</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>
<xref linkend='XTestSetVisualIDOfVisual' xrefstyle='select: title'/>
sets the VisualID within the opaque datatype referenced by visual to
be that specified by visualid.
</para>

<funcsynopsis id='XTestDiscard'>
<funcprototype>
<funcdef>Bool<function> XTestDiscard</function></funcdef>
<paramdef>Display<parameter> *display</parameter></paramdef>
</funcprototype>
</funcsynopsis>

<para>
<xref linkend='XTestDiscard' xrefstyle='select: title'/>
discards any requests within the output buffer for the specified display.
It returns
<function>True</function>
if any requests were discarded; otherwise, it returns
<function>False</function>
</para>
</chapter>

<chapter id='References'>
<title>References</title>

<para>
Annicchiarico, D., et al., <emphasis remap='I'>XTrap: The XTrap
Architecture</emphasis>.
Digital Equipment Corporation, July 1991.
</para>

<para>
Drake, K. J., <emphasis remap='I'>Some Proposals for a Minimum X11
Testing Extension</emphasis>.
UniSoft Ltd., June 1991.
</para>

</chapter>
</book>
