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187 lines
11 KiB
187 lines
11 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qbitmap.cpp:42 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QBitmap Class</title>
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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>QBitmap Class Reference</h1>
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<p>The QBitmap class provides monochrome (1-bit depth) pixmaps.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qbitmap-h.html">qbitmap.h</a>></tt>
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<p>Inherits <a href="qpixmap.html">QPixmap</a>.
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<p><a href="qbitmap-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="#QBitmap"><b>QBitmap</b></a> ()</li>
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<li class=fn><a href="#QBitmap-2"><b>QBitmap</b></a> ( int w, int h, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )</li>
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<li class=fn><a href="#QBitmap-3"><b>QBitmap</b></a> ( const QSize & size, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )</li>
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<li class=fn><a href="#QBitmap-4"><b>QBitmap</b></a> ( int w, int h, const uchar * bits, bool isXbitmap = FALSE )</li>
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<li class=fn><a href="#QBitmap-5"><b>QBitmap</b></a> ( const QSize & size, const uchar * bits, bool isXbitmap = FALSE )</li>
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<li class=fn><a href="#QBitmap-6"><b>QBitmap</b></a> ( const QBitmap & bitmap )</li>
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<li class=fn><a href="#QBitmap-7"><b>QBitmap</b></a> ( const QString & fileName, const char * format = 0 )</li>
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<li class=fn>QBitmap & <a href="#operator-eq"><b>operator=</b></a> ( const QBitmap & bitmap )</li>
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<li class=fn>QBitmap & <a href="#operator-eq-2"><b>operator=</b></a> ( const QPixmap & pixmap )</li>
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<li class=fn>QBitmap & <a href="#operator-eq-3"><b>operator=</b></a> ( const QImage & image )</li>
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<li class=fn>QBitmap <a href="#xForm"><b>xForm</b></a> ( const QWMatrix & matrix ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QBitmap class provides monochrome (1-bit depth) pixmaps.
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<p>
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<p> The QBitmap class is a monochrome off-screen paint device used
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mainly for creating custom <a href="qcursor.html">QCursor</a> and <a href="qbrush.html">QBrush</a> objects, in
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<a href="qpixmap.html#setMask">QPixmap::setMask</a>() and for <a href="qregion.html">QRegion</a>.
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<p> A QBitmap is a <a href="qpixmap.html">QPixmap</a> with a <a href="qpixmap.html#depth">depth</a>
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of 1. If a pixmap with a depth greater than 1 is assigned to a
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bitmap, the bitmap will be dithered automatically. A QBitmap is
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guaranteed to always have the depth 1, unless it is
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<a href="qpixmap.html#isNull">QPixmap::isNull</a>() which has depth 0.
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<p> When drawing in a QBitmap (or QPixmap with depth 1), we recommend
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using the <a href="qcolor.html">QColor</a> objects <tt>Qt::color0</tt> and <tt>Qt::color1</tt>.
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Painting with <tt>color0</tt> sets the bitmap bits to 0, and painting
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with <tt>color1</tt> sets the bits to 1. For a bitmap, 0-bits indicate
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background (or transparent) and 1-bits indicate foreground (or
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opaque). Using the <tt>black</tt> and <tt>white</tt> QColor objects make no
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sense because the <a href="qcolor.html#pixel">QColor::pixel</a>() value is not necessarily 0 for
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black and 1 for white.
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<p> The QBitmap can be transformed (translated, scaled, sheared or
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rotated) using <a href="#xForm">xForm</a>().
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<p> Just like the <a href="qpixmap.html">QPixmap</a> class, QBitmap is optimized by the use of
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<a href="shclass.html">implicit sharing</a>, so it is very
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efficient to pass QBitmap objects as arguments.
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<p> <p>See also <a href="qpixmap.html">QPixmap</a>, <a href="qpainter.html#drawPixmap">QPainter::drawPixmap</a>(), <a href="qpaintdevice.html#bitBlt">bitBlt</a>(), <a href="shclass.html">Shared Classes</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QBitmap"></a>QBitmap::QBitmap ()
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</h3>
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Constructs a null bitmap.
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<p> <p>See also <a href="qpixmap.html#isNull">QPixmap::isNull</a>().
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<h3 class=fn><a name="QBitmap-2"></a>QBitmap::QBitmap ( int w, int h, bool clear = FALSE, <a href="qpixmap.html#Optimization-enum">QPixmap::Optimization</a> optimization = QPixmap::DefaultOptim )
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</h3>
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Constructs a bitmap with width <em>w</em> and height <em>h</em>.
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<p> The contents of the bitmap is uninitialized if <em>clear</em> is FALSE;
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otherwise it is filled with pixel value 0 (the <a href="qcolor.html">QColor</a> <tt>Qt::color0</tt>).
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<p> The optional <em>optimization</em> argument specifies the optimization
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setting for the bitmap. The default optimization should be used in
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most cases. Games and other pixmap-intensive applications may
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benefit from setting this argument; see <a href="qpixmap.html#Optimization-enum">QPixmap::Optimization</a>.
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<p> <p>See also <a href="qpixmap.html#setOptimization">QPixmap::setOptimization</a>() and <a href="qpixmap.html#setDefaultOptimization">QPixmap::setDefaultOptimization</a>().
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<h3 class=fn><a name="QBitmap-3"></a>QBitmap::QBitmap ( const <a href="qsize.html">QSize</a> & size, bool clear = FALSE, <a href="qpixmap.html#Optimization-enum">QPixmap::Optimization</a> optimization = QPixmap::DefaultOptim )
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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> Constructs a bitmap with the size <em>size</em>.
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<p> The contents of the bitmap is uninitialized if <em>clear</em> is FALSE;
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otherwise it is filled with pixel value 0 (the <a href="qcolor.html">QColor</a> <tt>Qt::color0</tt>).
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<p> The optional <em>optimization</em> argument specifies the optimization
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setting for the bitmap. The default optimization should be used in
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most cases. Games and other pixmap-intensive applications may
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benefit from setting this argument; see <a href="qpixmap.html#Optimization-enum">QPixmap::Optimization</a>.
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<h3 class=fn><a name="QBitmap-4"></a>QBitmap::QBitmap ( int w, int h, const uchar * bits, bool isXbitmap = FALSE )
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</h3>
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Constructs a bitmap with width <em>w</em> and height <em>h</em> and sets the
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contents to <em>bits</em>.
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<p> The <em>isXbitmap</em> flag should be TRUE if <em>bits</em> was generated by
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the X11 bitmap program. The X bitmap bit order is little endian.
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The <a href="qimage.html">QImage</a> documentation discusses bit order of monochrome images.
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<p> Example (creates an arrow bitmap):
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<pre>
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uchar arrow_bits[] = { 0x3f, 0x1f, 0x0f, 0x1f, 0x3b, 0x71, 0xe0, 0xc0 };
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QBitmap bm( 8, 8, arrow_bits, TRUE );
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</pre>
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<h3 class=fn><a name="QBitmap-5"></a>QBitmap::QBitmap ( const <a href="qsize.html">QSize</a> & size, const uchar * bits, bool isXbitmap = FALSE )
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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> Constructs a bitmap with the size <em>size</em> and sets the contents to
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<em>bits</em>.
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<p> The <em>isXbitmap</em> flag should be TRUE if <em>bits</em> was generated by
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the X11 bitmap program. The X bitmap bit order is little endian.
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The <a href="qimage.html">QImage</a> documentation discusses bit order of monochrome images.
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<h3 class=fn><a name="QBitmap-6"></a>QBitmap::QBitmap ( const <a href="qbitmap.html">QBitmap</a> & bitmap )
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</h3>
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Constructs a bitmap that is a copy of <em>bitmap</em>.
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<h3 class=fn><a name="QBitmap-7"></a>QBitmap::QBitmap ( const <a href="qstring.html">QString</a> & fileName, const char * format = 0 )
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</h3>
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Constructs a bitmap from the file <em>fileName</em>. If the file does
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not exist or is of an unknown format, the bitmap becomes a null
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bitmap.
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<p> The parameters <em>fileName</em> and <em>format</em> are passed on to
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<a href="qpixmap.html#load">QPixmap::load</a>(). Dithering will be performed if the file format
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uses more than 1 bit per pixel.
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<p> <p>See also <a href="qpixmap.html#isNull">QPixmap::isNull</a>(), <a href="qpixmap.html#load">QPixmap::load</a>(), <a href="qpixmap.html#loadFromData">QPixmap::loadFromData</a>(), <a href="qpixmap.html#save">QPixmap::save</a>(), and <a href="qpixmap.html#imageFormat">QPixmap::imageFormat</a>().
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<h3 class=fn><a href="qbitmap.html">QBitmap</a> & <a name="operator-eq"></a>QBitmap::operator= ( const <a href="qbitmap.html">QBitmap</a> & bitmap )
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</h3>
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Assigns the bitmap <em>bitmap</em> to this bitmap and returns a
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reference to this bitmap.
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<h3 class=fn><a href="qbitmap.html">QBitmap</a> & <a name="operator-eq-2"></a>QBitmap::operator= ( const <a href="qpixmap.html">QPixmap</a> & pixmap )
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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> Assigns the pixmap <em>pixmap</em> to this bitmap and returns a
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reference to this bitmap.
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<p> Dithering will be performed if the pixmap has a <a href="qpixmap.html#depth">QPixmap::depth</a>()
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greater than 1.
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<h3 class=fn><a href="qbitmap.html">QBitmap</a> & <a name="operator-eq-3"></a>QBitmap::operator= ( const <a href="qimage.html">QImage</a> & image )
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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> Converts the image <em>image</em> to a bitmap and assigns the result to
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this bitmap. Returns a reference to the bitmap.
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<p> Dithering will be performed if the image has a <a href="qimage.html#depth">QImage::depth</a>()
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greater than 1.
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<h3 class=fn><a href="qbitmap.html">QBitmap</a> <a name="xForm"></a>QBitmap::xForm ( const <a href="qwmatrix.html">QWMatrix</a> & matrix ) const
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</h3>
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Returns a transformed copy of this bitmap by using <em>matrix</em>.
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<p> This function does exactly the same as <a href="qpixmap.html#xForm">QPixmap::xForm</a>(), except
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that it returns a QBitmap instead of a <a href="qpixmap.html">QPixmap</a>.
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<p> <p>See also <a href="qpixmap.html#xForm">QPixmap::xForm</a>().
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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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<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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