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465 lines
24 KiB
465 lines
24 KiB
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<title>QPaintDevice Class</title>
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<font color="#004faf">Home</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>QPaintDevice Class Reference</h1>
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<p>The QPaintDevice class is the base class of objects that
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can be painted.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpaintdevice-h.html">qpaintdevice.h</a>></tt>
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<p>Inherited by <a href="qwidget.html">QWidget</a>, <a href="qpixmap.html">QPixmap</a>, <a href="qpicture.html">QPicture</a>, and <a href="qprinter.html">QPrinter</a>.
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<p><a href="qpaintdevice-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>virtual <a href="#~QPaintDevice"><b>~QPaintDevice</b></a> ()</li>
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<li class=fn>bool <a href="#isExtDev"><b>isExtDev</b></a> () const</li>
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<li class=fn>bool <a href="#paintingActive"><b>paintingActive</b></a> () const</li>
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<li class=fn>virtual HDC <b>handle</b> () const</li>
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<li class=fn>virtual Qt::HANDLE <a href="#handle"><b>handle</b></a> () const</li>
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<li class=fn>Display * <a href="#x11Display"><b>x11Display</b></a> () const</li>
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<li class=fn>int <a href="#x11Screen"><b>x11Screen</b></a> () const</li>
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<li class=fn>int <a href="#x11Depth"><b>x11Depth</b></a> () const</li>
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<li class=fn>int <a href="#x11Cells"><b>x11Cells</b></a> () const</li>
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<li class=fn>Qt::HANDLE <a href="#x11Colormap"><b>x11Colormap</b></a> () const</li>
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<li class=fn>bool <a href="#x11DefaultColormap"><b>x11DefaultColormap</b></a> () const</li>
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<li class=fn>void * <a href="#x11Visual"><b>x11Visual</b></a> () const</li>
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<li class=fn>bool <a href="#x11DefaultVisual"><b>x11DefaultVisual</b></a> () const</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>Display * <a href="#x11AppDisplay"><b>x11AppDisplay</b></a> ()</li>
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<li class=fn>int <a href="#x11AppScreen"><b>x11AppScreen</b></a> ()</li>
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<li class=fn>int <a href="#x11AppDpiX-2"><b>x11AppDpiX</b></a> ()</li>
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<li class=fn>int <a href="#x11AppDpiY-2"><b>x11AppDpiY</b></a> ()</li>
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<li class=fn>void <a href="#x11SetAppDpiX-2"><b>x11SetAppDpiX</b></a> ( int dpi )</li>
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<li class=fn>void <a href="#x11SetAppDpiY-2"><b>x11SetAppDpiY</b></a> ( int dpi )</li>
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<li class=fn>int <a href="#x11AppDepth-2"><b>x11AppDepth</b></a> ()</li>
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<li class=fn>int <a href="#x11AppCells"><b>x11AppCells</b></a> ()</li>
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<li class=fn>Qt::HANDLE <a href="#x11AppRootWindow"><b>x11AppRootWindow</b></a> ()</li>
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<li class=fn>Qt::HANDLE <a href="#x11AppColormap"><b>x11AppColormap</b></a> ()</li>
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<li class=fn>bool <a href="#x11AppDefaultColormap"><b>x11AppDefaultColormap</b></a> ()</li>
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<li class=fn>void * <a href="#x11AppVisual"><b>x11AppVisual</b></a> ()</li>
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<li class=fn>bool <a href="#x11AppDefaultVisual"><b>x11AppDefaultVisual</b></a> ()</li>
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<li class=fn>int <a href="#x11AppDepth"><b>x11AppDepth</b></a> ( int screen )</li>
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<li class=fn>int <a href="#x11AppCells-2"><b>x11AppCells</b></a> ( int screen )</li>
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<li class=fn>Qt::HANDLE <a href="#x11AppRootWindow-2"><b>x11AppRootWindow</b></a> ( int screen )</li>
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<li class=fn>Qt::HANDLE <a href="#x11AppColormap-2"><b>x11AppColormap</b></a> ( int screen )</li>
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<li class=fn>void * <a href="#x11AppVisual-2"><b>x11AppVisual</b></a> ( int screen )</li>
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<li class=fn>bool <a href="#x11AppDefaultColormap-2"><b>x11AppDefaultColormap</b></a> ( int screen )</li>
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<li class=fn>bool <a href="#x11AppDefaultVisual-2"><b>x11AppDefaultVisual</b></a> ( int screen )</li>
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<li class=fn>int <a href="#x11AppDpiX"><b>x11AppDpiX</b></a> ( int screen )</li>
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<li class=fn>int <a href="#x11AppDpiY"><b>x11AppDpiY</b></a> ( int screen )</li>
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<li class=fn>void <a href="#x11SetAppDpiX"><b>x11SetAppDpiX</b></a> ( int dpi, int screen )</li>
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<li class=fn>void <a href="#x11SetAppDpiY"><b>x11SetAppDpiY</b></a> ( int dpi, int screen )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn><a href="#QPaintDevice"><b>QPaintDevice</b></a> ( uint devflags )</li>
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<li class=fn>virtual bool <a href="#cmd"><b>cmd</b></a> ( int, QPainter *, QPDevCmdParam * )</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>void <a href="#bitBlt"><b>bitBlt</b></a> ( QPaintDevice * dst, int dx, int dy, const QPaintDevice * src, int sx, int sy, int sw, int sh, Qt::RasterOp rop, bool ignoreMask )</li>
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<li class=fn>void <a href="#bitBlt-2"><b>bitBlt</b></a> ( QPaintDevice * dst, const QPoint & dp, const QPaintDevice * src, const QRect & sr, RasterOp rop )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPaintDevice class is the base class of objects that
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can be painted.
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<p>
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<p> A paint device is an abstraction of a two-dimensional space that
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can be drawn using a <a href="qpainter.html">QPainter</a>. The drawing capabilities are
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implemented by the subclasses <a href="qwidget.html">QWidget</a>, <a href="qpixmap.html">QPixmap</a>, <a href="qpicture.html">QPicture</a> and
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<a href="qprinter.html">QPrinter</a>.
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<p> The default coordinate system of a paint device has its origin
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located at the top-left position. X increases to the right and Y
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increases downward. The unit is one pixel. There are several ways
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to set up a user-defined coordinate system using the painter, for
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example, using <a href="qpainter.html#setWorldMatrix">QPainter::setWorldMatrix</a>().
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<p> Example (draw on a paint device):
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<pre>
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void MyWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> p; // our painter
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p.<a href="qpainter.html#begin">begin</a>( this ); // start painting the widget
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p.<a href="qpainter.html#setPen">setPen</a>( red ); // red outline
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p.<a href="qpainter.html#setBrush">setBrush</a>( yellow ); // yellow fill
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p.<a href="qpainter.html#drawEllipse">drawEllipse</a>( 10, 20, 100,100 ); // 100x100 ellipse at position (10, 20)
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p.<a href="qpainter.html#end">end</a>(); // painting done
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}
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</pre>
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<p> The bit block transfer is an extremely useful operation for
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copying pixels from one paint device to another (or to itself). It
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is implemented as the global function <a href="#bitBlt">bitBlt</a>().
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<p> Example (scroll widget contents 10 pixels to the right):
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<pre>
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<a href="#bitBlt">bitBlt</a>( myWidget, 10, 0, myWidget );
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</pre>
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<p> <b>Warning:</b> Qt requires that a <a href="qapplication.html">QApplication</a> object exists before
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any paint devices can be created. Paint devices access window
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system resources, and these resources are not initialized before
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an application object is created.
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<p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPaintDevice"></a>QPaintDevice::QPaintDevice ( uint devflags )<tt> [protected]</tt>
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</h3>
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Constructs a paint device with internal flags <em>devflags</em>. This
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constructor can be invoked only from QPaintDevice subclasses.
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<h3 class=fn><a name="~QPaintDevice"></a>QPaintDevice::~QPaintDevice ()<tt> [virtual]</tt>
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</h3>
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Destroys the paint device and frees window system resources.
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<h3 class=fn>bool <a name="cmd"></a>QPaintDevice::cmd ( int, <a href="qpainter.html">QPainter</a> *, QPDevCmdParam * )<tt> [virtual protected]</tt>
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</h3>
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Internal virtual function that interprets drawing commands from
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the painter.
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<p> Implemented by subclasses that have no direct support for drawing
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graphics (external paint devices, for example, <a href="qpicture.html">QPicture</a>).
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<h3 class=fn>Qt::HANDLE <a name="handle"></a>QPaintDevice::handle () const<tt> [virtual]</tt>
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</h3>
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Returns the window system handle of the paint device, for
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low-level access. Using this function is not portable.
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<p> The HANDLE type varies with platform; see <a href="qpaintdevice-h.html">qpaintdevice.h</a> and
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<a href="qwindowdefs-h.html">qwindowdefs.h</a> for details.
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<p> <p>See also <a href="#x11Display">x11Display</a>().
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<h3 class=fn>bool <a name="isExtDev"></a>QPaintDevice::isExtDev () const
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</h3>
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<p> Returns TRUE if the device is an external paint device; otherwise
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returns FALSE.
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<p> External paint devices cannot be <a href="#bitBlt">bitBlt</a>()'ed from. <a href="qpicture.html">QPicture</a> and
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<a href="qprinter.html">QPrinter</a> are external paint devices.
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<h3 class=fn>bool <a name="paintingActive"></a>QPaintDevice::paintingActive () const
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</h3>
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<p> Returns TRUE if the device is being painted, i.e. someone has
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called <a href="qpainter.html#begin">QPainter::begin</a>() but not yet called <a href="qpainter.html#end">QPainter::end</a>() for
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this device; otherwise returns FALSE.
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<p> <p>See also <a href="qpainter.html#isActive">QPainter::isActive</a>().
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<h3 class=fn>int <a name="x11AppCells"></a>QPaintDevice::x11AppCells ()<tt> [static]</tt>
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</h3>
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<p> Returns the number of entries in the colormap for the default
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screen of the X display global to the application (X11
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only). Using this function is not portable.
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<p> <p>See also <a href="#x11Colormap">x11Colormap</a>().
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<h3 class=fn>int <a name="x11AppCells-2"></a>QPaintDevice::x11AppCells ( int screen )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns the number of entries in the colormap for screen <em>screen</em>
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of the X display global to the application (X11 only). Using this
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function is not portable.
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<p> <p>See also <a href="#x11Colormap">x11Colormap</a>().
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<h3 class=fn>Qt::HANDLE <a name="x11AppColormap"></a>QPaintDevice::x11AppColormap ()<tt> [static]</tt>
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</h3>
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<p> Returns the colormap for the default screen of the X display
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global to the application (X11 only). Using this function is not
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portable.
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<p> <p>See also <a href="#x11Cells">x11Cells</a>().
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<h3 class=fn>Qt::HANDLE <a name="x11AppColormap-2"></a>QPaintDevice::x11AppColormap ( int screen )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns the colormap for screen <em>screen</em> of the X display global
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to the application (X11 only). Using this function is not
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portable.
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<p> <p>See also <a href="#x11Cells">x11Cells</a>().
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<h3 class=fn>bool <a name="x11AppDefaultColormap"></a>QPaintDevice::x11AppDefaultColormap ()<tt> [static]</tt>
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</h3>
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<p> Returns the default colormap for the default screen of the X
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display global to the application (X11 only). Using this function
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is not portable.
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<p> <p>See also <a href="#x11Cells">x11Cells</a>().
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<h3 class=fn>bool <a name="x11AppDefaultColormap-2"></a>QPaintDevice::x11AppDefaultColormap ( int screen )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns the default colormap for screen <em>screen</em> of the X display
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global to the application (X11 only). Using this function is not
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portable.
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<p> <p>See also <a href="#x11Cells">x11Cells</a>().
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<h3 class=fn>bool <a name="x11AppDefaultVisual"></a>QPaintDevice::x11AppDefaultVisual ()<tt> [static]</tt>
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</h3>
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<p> Returns TRUE if the Visual used is the default for the default
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screen of the X display global to the application (X11 only);
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otherwise returns FALSE. Using this function is not portable.
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<h3 class=fn>bool <a name="x11AppDefaultVisual-2"></a>QPaintDevice::x11AppDefaultVisual ( int screen )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns TRUE if the Visual used is the default for screen
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<em>screen</em> of the X display global to the application (X11 only);
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otherwise returns FALSE. Using this function is not portable.
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<h3 class=fn>int <a name="x11AppDepth"></a>QPaintDevice::x11AppDepth ( int screen )<tt> [static]</tt>
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</h3>
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<p> Returns the depth for screen <em>screen</em> of the X display global to
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the application (X11 only). Using this function is not portable.
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<p> <p>See also <a href="qpixmap.html#defaultDepth">QPixmap::defaultDepth</a>().
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<h3 class=fn>int <a name="x11AppDepth-2"></a>QPaintDevice::x11AppDepth ()<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns the depth for the default screen of the X display global
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to the application (X11 only). Using this function is not
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portable.
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<p> <p>See also <a href="qpixmap.html#defaultDepth">QPixmap::defaultDepth</a>().
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<h3 class=fn>Display * <a name="x11AppDisplay"></a>QPaintDevice::x11AppDisplay ()<tt> [static]</tt>
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</h3>
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<p> Returns a pointer to the X display global to the application (X11
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only). Using this function is not portable.
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<p> <p>See also <a href="#handle">handle</a>().
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<h3 class=fn>int <a name="x11AppDpiX"></a>QPaintDevice::x11AppDpiX ( int screen )<tt> [static]</tt>
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</h3>
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Returns the horizontal DPI of the X display (X11 only) for screen
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<em>screen</em>. Using this function is not portable. See
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<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> for portable access to related information.
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Using this function is not portable.
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<p> <p>See also <a href="#x11AppDpiY">x11AppDpiY</a>(), <a href="#x11SetAppDpiX">x11SetAppDpiX</a>(), and <a href="qpaintdevicemetrics.html#logicalDpiX">QPaintDeviceMetrics::logicalDpiX</a>().
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<h3 class=fn>int <a name="x11AppDpiX-2"></a>QPaintDevice::x11AppDpiX ()<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns the horizontal DPI of the X display (X11 only) for the
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default screen. Using this function is not portable. See
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<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> for portable access to related information.
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Using this function is not portable.
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<h3 class=fn>int <a name="x11AppDpiY"></a>QPaintDevice::x11AppDpiY ( int screen )<tt> [static]</tt>
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</h3>
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Returns the vertical DPI of the X11 display (X11 only) for screen
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<em>screen</em>. Using this function is not portable. See
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<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> for portable access to related information.
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Using this function is not portable.
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<p> <p>See also <a href="#x11AppDpiX">x11AppDpiX</a>(), <a href="#x11SetAppDpiY">x11SetAppDpiY</a>(), and <a href="qpaintdevicemetrics.html#logicalDpiY">QPaintDeviceMetrics::logicalDpiY</a>().
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<h3 class=fn>int <a name="x11AppDpiY-2"></a>QPaintDevice::x11AppDpiY ()<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns the vertical DPI of the X11 display (X11 only) for the
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default screen. Using this function is not portable. See
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<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> for portable access to related information.
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Using this function is not portable.
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<p> <p>See also <a href="#x11AppDpiX">x11AppDpiX</a>(), <a href="#x11SetAppDpiY">x11SetAppDpiY</a>(), and <a href="qpaintdevicemetrics.html#logicalDpiY">QPaintDeviceMetrics::logicalDpiY</a>().
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<h3 class=fn>Qt::HANDLE <a name="x11AppRootWindow"></a>QPaintDevice::x11AppRootWindow ()<tt> [static]</tt>
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</h3>
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<p> Returns the root window for the default screen of the X display
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global to the applicatoin (X11 only). Using this function is not
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portable.
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<h3 class=fn>Qt::HANDLE <a name="x11AppRootWindow-2"></a>QPaintDevice::x11AppRootWindow ( int screen )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p>
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<p> Returns the root window for screen <em>screen</em> of the X display
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global to the applicatoin (X11 only). Using this function is not
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portable.
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<h3 class=fn>int <a name="x11AppScreen"></a>QPaintDevice::x11AppScreen ()<tt> [static]</tt>
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</h3>
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<p> Returns the screen number on the X display global to the
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application (X11 only). Using this function is not portable.
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<h3 class=fn>void * <a name="x11AppVisual"></a>QPaintDevice::x11AppVisual ()<tt> [static]</tt>
|
|
</h3>
|
|
|
|
<p> Returns the Visual for the default screen of the X display global
|
|
to the application (X11 only). Using this function is not
|
|
portable.
|
|
|
|
<h3 class=fn>void * <a name="x11AppVisual-2"></a>QPaintDevice::x11AppVisual ( int screen )<tt> [static]</tt>
|
|
</h3>
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
|
<p>
|
|
<p> Returns the Visual for screen <em>screen</em> of the X display global to
|
|
the application (X11 only). Using this function is not portable.
|
|
|
|
<h3 class=fn>int <a name="x11Cells"></a>QPaintDevice::x11Cells () const
|
|
</h3>
|
|
|
|
<p> Returns the number of entries in the colormap of the X display for
|
|
the paint device (X11 only). Using this function is not portable.
|
|
<p> <p>See also <a href="#x11Colormap">x11Colormap</a>().
|
|
|
|
<h3 class=fn>Qt::HANDLE <a name="x11Colormap"></a>QPaintDevice::x11Colormap () const
|
|
</h3>
|
|
|
|
<p> Returns the colormap of the X display for the paint device (X11
|
|
only). Using this function is not portable.
|
|
<p> <p>See also <a href="#x11Cells">x11Cells</a>().
|
|
|
|
<h3 class=fn>bool <a name="x11DefaultColormap"></a>QPaintDevice::x11DefaultColormap () const
|
|
</h3>
|
|
|
|
<p> Returns the default colormap of the X display for the paint device
|
|
(X11 only). Using this function is not portable.
|
|
<p> <p>See also <a href="#x11Cells">x11Cells</a>().
|
|
|
|
<h3 class=fn>bool <a name="x11DefaultVisual"></a>QPaintDevice::x11DefaultVisual () const
|
|
</h3>
|
|
|
|
<p> Returns the default Visual of the X display for the paint device
|
|
(X11 only). Using this function is not portable.
|
|
|
|
<h3 class=fn>int <a name="x11Depth"></a>QPaintDevice::x11Depth () const
|
|
</h3>
|
|
|
|
<p> Returns the depth of the X display for the paint device (X11
|
|
only). Using this function is not portable.
|
|
<p> <p>See also <a href="qpixmap.html#defaultDepth">QPixmap::defaultDepth</a>().
|
|
|
|
<h3 class=fn>Display * <a name="x11Display"></a>QPaintDevice::x11Display () const
|
|
</h3>
|
|
|
|
<p> Returns a pointer to the X display for the paint device (X11
|
|
only). Using this function is not portable.
|
|
<p> <p>See also <a href="#handle">handle</a>().
|
|
|
|
<h3 class=fn>int <a name="x11Screen"></a>QPaintDevice::x11Screen () const
|
|
</h3>
|
|
|
|
<p> Returns the screen number on the X display for the paint device
|
|
(X11 only). Using this function is not portable.
|
|
|
|
<h3 class=fn>void <a name="x11SetAppDpiX"></a>QPaintDevice::x11SetAppDpiX ( int dpi, int screen )<tt> [static]</tt>
|
|
</h3>
|
|
Sets the value returned by <a href="#x11AppDpiX">x11AppDpiX</a>() to <em>dpi</em> for screen
|
|
<em>screen</em>. The default is determined by the display configuration.
|
|
Changing this value will alter the scaling of fonts and many other
|
|
metrics and is not recommended. Using this function is not
|
|
portable.
|
|
<p> <p>See also <a href="#x11SetAppDpiY">x11SetAppDpiY</a>().
|
|
|
|
<h3 class=fn>void <a name="x11SetAppDpiX-2"></a>QPaintDevice::x11SetAppDpiX ( int dpi )<tt> [static]</tt>
|
|
</h3>
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
|
<p> Sets the value returned by <a href="#x11AppDpiX">x11AppDpiX</a>() to <em>dpi</em> for the default
|
|
screen. The default is determined by the display configuration.
|
|
Changing this value will alter the scaling of fonts and many other
|
|
metrics and is not recommended. Using this function is not
|
|
portable.
|
|
<p>
|
|
<h3 class=fn>void <a name="x11SetAppDpiY"></a>QPaintDevice::x11SetAppDpiY ( int dpi, int screen )<tt> [static]</tt>
|
|
</h3>
|
|
Sets the value returned by <a href="#x11AppDpiY">x11AppDpiY</a>() to <em>dpi</em> for screen
|
|
<em>screen</em>. The default is determined by the display configuration.
|
|
Changing this value will alter the scaling of fonts and many other
|
|
metrics and is not recommended. Using this function is not
|
|
portable.
|
|
<p> <p>See also <a href="#x11SetAppDpiX">x11SetAppDpiX</a>().
|
|
|
|
<h3 class=fn>void <a name="x11SetAppDpiY-2"></a>QPaintDevice::x11SetAppDpiY ( int dpi )<tt> [static]</tt>
|
|
</h3>
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
|
<p> Sets the value returned by <a href="#x11AppDpiY">x11AppDpiY</a>() to <em>dpi</em> for the default
|
|
screen. The default is determined by the display configuration.
|
|
Changing this value will alter the scaling of fonts and many other
|
|
metrics and is not recommended. Using this function is not
|
|
portable.
|
|
|
|
<h3 class=fn>void * <a name="x11Visual"></a>QPaintDevice::x11Visual () const
|
|
</h3>
|
|
|
|
<p> Returns the Visual of the X display for the paint device (X11
|
|
only). Using this function is not portable.
|
|
|
|
<hr><h2>Related Functions</h2>
|
|
<h3 class=fn>void <a name="bitBlt"></a>bitBlt ( <a href="qpaintdevice.html">QPaintDevice</a> * dst, int dx, int dy, const <a href="qpaintdevice.html">QPaintDevice</a> * src, int sx, int sy, int sw, int sh, <a href="qt.html#RasterOp-enum">Qt::RasterOp</a> rop, bool ignoreMask )
|
|
</h3>
|
|
|
|
<p> Copies a block of pixels from <em>src</em> to <em>dst</em>, perhaps merging
|
|
each pixel according to the <a href="qt.html#RasterOp-enum">raster operation</a>
|
|
<em>rop</em>. <em>sx</em>, <em>sy</em>
|
|
is the top-left pixel in <em>src</em> (0, 0) by default, <em>dx</em>, <em>dy</em> is
|
|
the top-left position in <em>dst</em> and <em>sw</em>, <em>sh</em> is the size of
|
|
the copied block (all of <em>src</em> by default).
|
|
<p> The most common values for <em>rop</em> are CopyROP and XorROP; the <a href="qt.html#RasterOp-enum">Qt::RasterOp</a> documentation defines all the possible values.
|
|
<p> If <em>ignoreMask</em> is FALSE (the default) and <em>src</em> is a
|
|
masked <a href="qpixmap.html">QPixmap</a>, the entire blit is masked by <em>src</em>->mask().
|
|
<p> If <em>src</em>, <em>dst</em>, <em>sw</em> or <em>sh</em> is 0, <a href="#bitBlt">bitBlt</a>() does nothing. If
|
|
<em>sw</em> or <em>sh</em> is negative bitBlt() copies starting at <em>sx</em> (and
|
|
respectively, <em>sy</em>) and ending at the right end (respectively,
|
|
bottom) of <em>src</em>.
|
|
<p> <em>src</em> must be a <a href="qwidget.html">QWidget</a> or QPixmap. You cannot blit from a
|
|
<a href="qprinter.html">QPrinter</a>, for example. bitBlt() does nothing if you attempt to
|
|
blit from an unsupported device.
|
|
<p> bitBlt() does nothing if <em>src</em> has a greater depth than <em>dst</em>.
|
|
If you need to for example, draw a 24-bit pixmap on an 8-bit
|
|
widget, you must use drawPixmap().
|
|
|
|
<h3 class=fn>void <a name="bitBlt-2"></a>bitBlt ( <a href="qpaintdevice.html">QPaintDevice</a> * dst, const <a href="qpoint.html">QPoint</a> & dp, const <a href="qpaintdevice.html">QPaintDevice</a> * src, const <a href="qrect.html">QRect</a> & sr, RasterOp rop )
|
|
</h3>
|
|
|
|
<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
|
<p> Overloaded <a href="#bitBlt">bitBlt</a>() with the destination point <em>dp</em> and source
|
|
rectangle <em>sr</em>.
|
|
|
|
<!-- eof -->
|
|
<hr><p>
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
|
Copyright © 1995-2007
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|