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202 lines
9.3 KiB
202 lines
9.3 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qdirectpainter_qws.cpp:72 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QDirectPainter Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QDirectPainter Class Reference</h1>
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<p>The QDirectPainter class provides direct access to the video hardware.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qdirectpainter_qws-h.html">qdirectpainter_qws.h</a>></tt>
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<p>Inherits <a href="qpainter.html">QPainter</a>.
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<p><a href="qdirectpainter-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QDirectPainter"><b>QDirectPainter</b></a> ( const QWidget * w )</li>
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<li class=fn><a href="#~QDirectPainter"><b>~QDirectPainter</b></a> ()</li>
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<li class=fn>uchar * <a href="#frameBuffer"><b>frameBuffer</b></a> ()</li>
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<li class=fn>int <a href="#lineStep"><b>lineStep</b></a> ()</li>
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<li class=fn>int <a href="#transformOrientation"><b>transformOrientation</b></a> ()</li>
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<li class=fn>int <a href="#numRects"><b>numRects</b></a> () const</li>
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<li class=fn>const QRect & <a href="#rect"><b>rect</b></a> ( int i ) const</li>
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<li class=fn>QRegion <a href="#region"><b>region</b></a> () const</li>
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<li class=fn>int <a href="#depth"><b>depth</b></a> () const</li>
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<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>int <a href="#xOffset"><b>xOffset</b></a> () const</li>
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<li class=fn>int <a href="#yOffset"><b>yOffset</b></a> () const</li>
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<li class=fn>QPoint <a href="#offset"><b>offset</b></a> () const</li>
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<li class=fn>QSize <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>void <a href="#setAreaChanged"><b>setAreaChanged</b></a> ( const QRect & r )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QDirectPainter class provides direct access to the video hardware.
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<p>
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<p> Only available in Qt/Embedded.
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<p> When the hardware is known and well defined, as is often the case
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with software for embedded devices, it may be useful to manipulate
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the underlying video hardware directly. In order to do this in a
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way that is co-operative with other applications, you must lock
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the video hardware for exclusive use for a small time while you
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write to it, and you must know the clipping region which is
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allocated to a widget.
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<p> QDirectPainter provides this functionality.
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<p> In the simplest case, you make a QDirectPainter on a widget and
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then, observing the clip region, perform some platform-specific
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operation. For example:
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<pre>
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void MyWidget::updatePlatformGraphics()
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{
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QDirectPainter dp( this );
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for ( int i = 0; i < dp.numRects; i++ ) {
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const <a href="qrect.html">QRect</a>& clip = dp.<a href="#rect">rect</a>(i);
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... // platform specific operation
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}
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}
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</pre>
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<p> The platform-specific code has access to the display, but should
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only modify graphics in the rectangles specified by <a href="#numRects">numRects</a>() and
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<a href="#rect">rect</a>(). Note that these rectangles are relative to the entire
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display.
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<p> The <a href="#offset">offset</a>() function returns the position of the widget relative
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to the entire display, allowing you to offset platform-specific
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operations appropriately. The <a href="#xOffset">xOffset</a>() and <a href="#yOffset">yOffset</a>() functions
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merely return the component values of offset().
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<p> For simple frame-buffer hardware, the <a href="#frameBuffer">frameBuffer</a>(), <a href="#lineStep">lineStep</a>(),
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and <a href="#depth">depth</a>() functions provide basic access, though some hardware
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configurations are insufficiently specified by such simple
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parameters.
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<p> Note that while a QDirectPainter exists, the entire Qt/Embedded
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window system is locked from use by other applications. Always
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construct the QDirectPainter as an auto (stack) variable, and be
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very careful to write robust and stable code within its scope.
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<p>See also <a href="graphics.html">Graphics Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QDirectPainter"></a>QDirectPainter::QDirectPainter ( const <a href="qwidget.html">QWidget</a> * w )
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</h3>
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Construct a direct painter on <em>w</em>. The display is locked and the
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mouse cursor is hidden if it is above <em>w</em>.
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<h3 class=fn><a name="~QDirectPainter"></a>QDirectPainter::~QDirectPainter ()
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</h3>
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Destroys the direct painter. The mouse cursor is revealed if
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necessary and the display is unlocked.
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<h3 class=fn>int <a name="depth"></a>QDirectPainter::depth () const
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</h3>
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Returns the bit-depth of the display.
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<h3 class=fn>uchar * <a name="frameBuffer"></a>QDirectPainter::frameBuffer ()
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</h3>
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Returns a pointer to the framebuffer memory if available.
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<h3 class=fn>int <a name="height"></a>QDirectPainter::height () const
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</h3>
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Returns the height of the widget drawn upon.
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<h3 class=fn>int <a name="lineStep"></a>QDirectPainter::lineStep ()
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</h3>
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Returns the spacing in bytes from one framebuffer line to the
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next.
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<h3 class=fn>int <a name="numRects"></a>QDirectPainter::numRects () const
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</h3>
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Returns the number of rectangles in the drawable region.
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<p> <p>See also <a href="#rect">rect</a>() and <a href="#region">region</a>().
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<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="offset"></a>QDirectPainter::offset () const
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</h3>
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Returns the position of the widget relative to the entire display.
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<h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="rect"></a>QDirectPainter::rect ( int i ) const
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</h3>
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Returns a reference to rectangle <em>i</em> of the drawable region.
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Valid values for <em>i</em> are 0..<a href="#numRects">numRects</a>()-1.
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<p> <p>See also <a href="#region">region</a>().
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<h3 class=fn><a href="qregion.html">QRegion</a> <a name="region"></a>QDirectPainter::region () const
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</h3>
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Returns the region of the framebuffer which represents the exposed
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area of the widget being painted on. Note that this may be a sub-area of
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the clip region, because of child widgets and overlapping cousin widgets.
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<p> <p>See also <a href="#numRects">numRects</a>() and <a href="#rect">rect</a>().
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<h3 class=fn>void <a name="setAreaChanged"></a>QDirectPainter::setAreaChanged ( const <a href="qrect.html">QRect</a> & r )
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</h3>
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Sets the area changed by the transaction to <em>r</em>. By default, the
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entire widget is assumed to have changed. The area changed is only
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used by some graphics drivers, so often calling this function for
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a smaller area will make no difference to performance.
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<h3 class=fn><a href="qsize.html">QSize</a> <a name="size"></a>QDirectPainter::size () const
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</h3>
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Returns the size of the widget drawn upon.
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<p> <p>See also <a href="#width">width</a>() and <a href="#height">height</a>().
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<h3 class=fn>int <a name="transformOrientation"></a>QDirectPainter::transformOrientation ()
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</h3>
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Returns a number that signifies the orientation of the
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framebuffer.
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<center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#f0f0f0"> <td valign="top" colspan="1" rowspan="1"> 0 <td valign="top" colspan="1" rowspan="1"> no rotation
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<tr bgcolor="#d0d0d0"> <td valign="top" colspan="1" rowspan="1"> 1 <td valign="top" colspan="1" rowspan="1"> 90 degrees rotation
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<tr bgcolor="#f0f0f0"> <td valign="top" colspan="1" rowspan="1"> 2 <td valign="top" colspan="1" rowspan="1"> 180 degrees rotation
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<tr bgcolor="#d0d0d0"> <td valign="top" colspan="1" rowspan="1"> 3 <td valign="top" colspan="1" rowspan="1"> 270 degrees rotation
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</table></center>
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<h3 class=fn>int <a name="width"></a>QDirectPainter::width () const
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</h3>
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Returns the width of the widget drawn upon.
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<h3 class=fn>int <a name="xOffset"></a>QDirectPainter::xOffset () const
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</h3>
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Returns the X-position of the widget relative to the entire
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display.
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<h3 class=fn>int <a name="yOffset"></a>QDirectPainter::yOffset () const
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</h3>
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Returns the Y-position of the widget relative to the entire
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display.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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