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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtgui.html">QtGui</a></li> <li>QCustomRasterPaintDevice</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QCustomRasterPaintDevice Class Reference</h1> <!-- $$$QCustomRasterPaintDevice-brief --> <p>The QCustomRasterPaintDevice class is provided to activate hardware accelerated paint engines in Qt for Embedded Linux. <a href="#details">More...</a></p> <!-- @@@QCustomRasterPaintDevice --> <pre class="cpp"> <span class="preprocessor">#include <QCustomRasterPaintDevice></span></pre><p><b>This class is under development and is subject to change.</b></p> <p><b>Inherits: </b><a href="qpaintdevice.html">QPaintDevice</a>.</p> <p>This class was introduced in Qt 4.2.</p> <ul> <li><a href="qcustomrasterpaintdevice-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qcustomrasterpaintdevice.html#QCustomRasterPaintDevice">QCustomRasterPaintDevice</a></b> ( QWidget * <i>widget</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qcustomrasterpaintdevice.html#bytesPerLine">bytesPerLine</a></b> () const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual QImage::Format </td><td class="memItemRight bottomAlign"><b><a href="qcustomrasterpaintdevice.html#format">format</a></b> () const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void * </td><td class="memItemRight bottomAlign"><b><a href="qcustomrasterpaintdevice.html#memory">memory</a></b> () const</td></tr> </table> <a name="reimplemented-public-functions"></a> <h2>Reimplemented Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qcustomrasterpaintdevice.html#metric">metric</a></b> ( PaintDeviceMetric <i>m</i> ) const</td></tr> </table> <ul> <li class="fn">13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li> </ul> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li> </ul> <a name="details"></a> <!-- $$$QCustomRasterPaintDevice-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QCustomRasterPaintDevice class is provided to activate hardware accelerated paint engines in Qt for Embedded Linux.</p> <p>Note that this class is only available in <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>.</p> <p>In <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>, painting is a pure software implementation. But starting with Qt 4.2, it is possible to add an accelerated graphics driver to take advantage of available hardware resources.</p> <p>Hardware acceleration is accomplished by creating a custom screen driver, accelerating the copying from memory to the screen, and implementing a custom paint engine accelerating the various painting operations. Then a custom paint device (derived from the QCustomRasterPaintDevice class) and a custom window surface (derived from QWSWindowSurface) must be implemented to make <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> aware of the accelerated driver.</p> <p>See the <a href="qt-embedded-accel.html">Adding an Accelerated Graphics Driver to Qt for Embedded Linux</a> documentation for details.</p> </div> <p><b>See also </b><a href="qrasterpaintengine.html">QRasterPaintEngine</a> and <a href="qpaintdevice.html">QPaintDevice</a>.</p> <!-- @@@QCustomRasterPaintDevice --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QCustomRasterPaintDevice[overload1]$$$QCustomRasterPaintDeviceQWidget* --> <h3 class="fn"><a name="QCustomRasterPaintDevice"></a>QCustomRasterPaintDevice::<span class="name">QCustomRasterPaintDevice</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )</h3> <p>Constructs a custom raster based paint device for the given top-level <i>widget</i>.</p> <!-- @@@QCustomRasterPaintDevice --> <!-- $$$bytesPerLine[overload1]$$$bytesPerLine --> <h3 class="fn"><a name="bytesPerLine"></a><span class="type">int</span> QCustomRasterPaintDevice::<span class="name">bytesPerLine</span> () const<tt> [virtual]</tt></h3> <p>Returns the number of bytes per line in the framebuffer. Note that this number might be larger than the framebuffer width.</p> <!-- @@@bytesPerLine --> <!-- $$$format[overload1]$$$format --> <h3 class="fn"><a name="format"></a><span class="type"><a href="qimage.html#Format-enum">QImage::Format</a></span> QCustomRasterPaintDevice::<span class="name">format</span> () const<tt> [virtual]</tt></h3> <p>Returns the format of the device's memory buffet.</p> <p>The default format is <a href="qimage.html#Format-enum">QImage::Format_ARGB32_Premultiplied</a>. The only other valid format is <a href="qimage.html#Format-enum">QImage::Format_RGB16</a>.</p> <!-- @@@format --> <!-- $$$memory[overload1]$$$memory --> <h3 class="fn"><a name="memory"></a><span class="type">void</span> * QCustomRasterPaintDevice::<span class="name">memory</span> () const<tt> [virtual]</tt></h3> <p>Returns a pointer to the paint device's memory buffer, or 0 if no such buffer exists.</p> <!-- @@@memory --> <!-- $$$metric[overload1]$$$metricPaintDeviceMetric --> <h3 class="fn"><a name="metric"></a><span class="type">int</span> QCustomRasterPaintDevice::<span class="name">metric</span> ( <span class="type"><a href="qpaintdevice.html#PaintDeviceMetric-enum">PaintDeviceMetric</a></span> <i>m</i> ) const<tt> [virtual]</tt></h3> <p>Reimplemented from <a href="qpaintdevice.html#metric">QPaintDevice::metric</a>().</p> <!-- @@@metric --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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