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<h1 class="title">Qt for Embedded Linux Environment Variables</h1>
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<!-- $$$qt-embedded-envvars.html-description -->
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<p>These environment variables are relevant to <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> users.</p>
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<thead><tr class="qt-style"><th >Variable</th><th >Description</th></tr></thead>
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<tr valign="top" class="odd"><td ><b>POINTERCAL_FILE</b> <a name="pointercal-file"></a></td><td >Specifies the file containing the data used to calibrate the pointer device.<p>See also <a href="qwscalibratedmousehandler.html">QWSCalibratedMouseHandler</a> and <a href="qt-embedded-pointer.html">Qt for Embedded Linux Pointer Handling</a>.</p>
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</td></tr>
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<tr valign="top" class="even"><td ><b>QT_ONSCREEN_PAINT</b> <a name="qt-onscreen-paint"></a></td><td >If defined, the application will render its widgets directly on screen. The affected regions of the screen will not be modified by the screen driver unless another window with a higher focus requests (parts of) the same region.<p>Setting this environment variable is equivalent to setting the <a href="qt.html#WidgetAttribute-enum">Qt::WA_PaintOnScreen</a> attribute for all the widgets in the application.</p>
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<p>See also the Qt for Embedded Linux <a href="qt-embedded-architecture.html#graphics-rendering">graphics rendering</a> documentation.</p>
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</td></tr>
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<tr valign="top" class="odd"><td ><b>QWS_SW_CURSOR</b> <a name="qws-sw-cursor"></a></td><td >If defined, the software mouse cursor is always used (even when using an accelerated driver that supports a hardware cursor).</td></tr>
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<tr valign="top" class="even"><td ><b>QWS_DISPLAY</b> <a name="qws-display"></a></td><td >Specifies the display type and framebuffer. For example, if the current shell is bash, ksh, zsh or sh:<pre class="cpp"> export QWS_DISPLAY=<driver>[:<driver specific options>]...
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[:<display num>]</pre>
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<p>The valid values for the <tt><driver></tt> argument are <tt>LinuxFb</tt>, <tt>QVFb</tt>, <tt>VNC</tt>, <tt>Transformed</tt>, <tt>Multi</tt> and <a href="qscreendriverplugin.html#keys">keys</a> identifying custom drivers, and the <tt><display num></tt> argument is used to separate screens that are using the same screen driver and to enable multiple displays (see the <a href="qt-embedded-running.html">Running Qt for Embedded Linux Applications</a> documentation for more details).</p>
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<p>The driver specific options are described in the <a href="qt-embedded-displaymanagement.html">display management</a> documentation.</p>
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</td></tr>
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<tr valign="top" class="odd"><td ><b>QWS_SIZE</b> <a name="qws-size"></a></td><td >Specifies the size of the <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> window which is centered within the screen. For example, if the current shell is bash, ksh, zsh or sh:<pre class="cpp"> export QWS_SIZE=<width>x<height></pre>
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</td></tr>
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<tr valign="top" class="even"><td ><b>QWS_MOUSE_PROTO</b> <a name="qws-mouse-proto"></a></td><td >Specifies the driver for pointer handling. For example, if the current shell is bash, ksh, zsh or sh:<pre class="cpp"> export QWS_MOUSE_PROTO=<driver>[:<driver specific options>]</pre>
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<p>The valid values for the <tt><driver></tt> argument are <tt>MouseMan</tt>, <tt>IntelliMouse</tt>, <tt>Microsoft</tt>, <tt>LinuxTP</tt>, <tt>LinuxInput</tt>, <tt>Tslib</tt> and <a href="qmousedriverplugin.html#keys">keys</a> identifying custom drivers, and the driver specific options are typically a device, e.g., <tt>/dev/mouse</tt> for mouse devices and <tt>/dev/ts</tt> for touch panels.</p>
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<p>Multiple mouse drivers can be specified in one go:</p>
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<pre class="cpp"> export QWS_MOUSE_PROTO="<driver>[:<driver specific options>]
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<driver>[:<driver specific options>]
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<driver>[:<driver specific options>]"</pre>
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<p>Input will be read from all specified drivers.</p>
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<p>See also <a href="qt-embedded-pointer.html">Qt for Embedded Linux Pointer Handling</a>.</p>
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</td></tr>
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<tr valign="top" class="odd"><td ><b>QWS_KEYBOARD</b> <a name="qws-keyboard"></a></td><td >Specifies the driver and device for character input. For example, if the current shell is bash, ksh, zsh or sh:<pre class="cpp"> export QWS_KEYBOARD=<driver>[:<driver specific options>]</pre>
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<p>The valid values for the <tt><driver></tt> argument are <tt>TTY</tt>, <tt>LinuxInput</tt> and <a href="qkbddriverplugin.html#keys">keys</a> identifying custom drivers, and the driver specific options are typically a device, e.g., <tt>/dev/tty0</tt>.</p>
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<p>Multiple keyboard drivers can be specified in one go:</p>
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<pre class="cpp"> export QWS_KEYBOARD="<driver>[:<driver specific options>]
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<driver>[:<driver specific options>]
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<driver>[:<driver specific options>]"</pre>
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<p>Input will be read from all specified drivers.</p>
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<p>See also <a href="qt-embedded-charinput.html">Qt for Embedded Linux Character Input</a>.</p>
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