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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QBitmap Class Reference</h1><br clear="all">
<p>
The QBitmap class provides monochrome (1 bit depth) pixmaps.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qbitmap-h.html">qbitmap.h</a>></code>
<p>
Inherits <a href="qpixmap.html">QPixmap</a>.
<p><a href="qbitmap-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#353e84"><b>QBitmap</b></a>()</div>
<li><div class="fn"><a href="#12bed2"><b>QBitmap</b></a>(intw, inth, boolclear=FALSE, QPixmap::Optimization=QPixmap::DefaultOptim)</div>
<li><div class="fn"><a href="#2c4ff2"><b>QBitmap</b></a>(constQSize&, boolclear=FALSE, QPixmap::Optimization=QPixmap::DefaultOptim)</div>
<li><div class="fn"><a href="#c9b25d"><b>QBitmap</b></a>(intw, inth, constuchar*bits, boolisXbitmap=FALSE)</div>
<li><div class="fn"><a href="#29fa2b"><b>QBitmap</b></a>(constQSize&, constuchar*bits, boolisXbitmap=FALSE)</div>
<li><div class="fn"><a href="#9ee1bb"><b>QBitmap</b></a>(constQBitmap&)</div>
<li><div class="fn"><a href="#28e426"><b>QBitmap</b></a>(constQString&fileName, constchar*format=0)</div>
<li><div class="fn">QBitmap&<a href="#6d398d"><b>operator=</b></a>(constQBitmap&)</div>
<li><div class="fn">QBitmap&<a href="#57c2bf"><b>operator=</b></a>(constQPixmap&)</div>
<li><div class="fn">QBitmap&<a href="#cd1e18"><b>operator=</b></a>(constQImage&)</div>
<li><div class="fn">QBitmap<a href="#33c04b"><b>xForm</b></a>(constQWMatrix&)const</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QBitmap class provides monochrome (1 bit depth) pixmaps.
<p>
The QBitmap class is a monochrome off-screen paint device, used
mainly for creating custom <a href="qcursor.html">QCursor</a> and <a href="qbrush.html">QBrush</a> objects, in
<a href="qpixmap.html#68a75d">QPixmap::setMask</a>() and for <a href="qregion.html">QRegion</a>.
<p>A QBitmap is a <a href="qpixmap.html">QPixmap</a> with a <a href="qpixmap.html#3c91c2">QPixmap::depth</a>() of 1.
If a pixmap with a depth greater than 1 is assigned to a bitmap, the
bitmap will be automatically dithered. A QBitmap is guaranteed to always
have the depth 1, unless it is <a href="qpixmap.html#7803c4">QPixmap::isNull</a>() (has depth 0).
<p>When drawing in a QBitmap (or QPixmap with depth 1), we recommend using
the <a href="qcolor.html">QColor</a> objects <code>Qt::color0</code> and <code>Qt::color1.</code> Painting with <code>color0</code> sets the bitmap bits to 0, and painting with <code>color1</code> sets the
bits to 1. For a bitmap, 0-bits indicate background (or white) and
1-bits indicate foreground (or black). Using the <code>black</code> and <code>white</code>
QColor objects make no sense, because the <a href="qcolor.html#4cec2b">QColor::pixel</a>()
value is not necessarily 0 for black and 1 for white.
<p>Just like the QPixmap class, QBitmap is optimized by the use of <a href="shclass.html">implicit sharing</a>, so it is very efficient to pass
QBitmap objects as arguments.
<p>See also <a href="qpixmap.html">QPixmap</a>, <a href="qpainter.html#c64b89">QPainter::drawPixmap</a>(), <a href="qpaintdevice.html#35ae2e">bitBlt</a>() and <a href="shclass.html">Shared Classes</a>
<p>Examples:
<a href="cursor-cursor-cpp.html#QBitmap">cursor/cursor.cpp</a>
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="353e84"></a>QBitmap::QBitmap()</h3>
<p>Constructs a null bitmap.
<p>See also <a href="qpixmap.html#7803c4">QPixmap::isNull</a>().
<h3 class="fn"><a name="28e426"></a>QBitmap::QBitmap(const<a href="qstring.html">QString</a>&fileName, constchar*format=0)</h3>
<p>Constructs a pixmap from the file <em>fileName.</em> If the file does not
exist, or is of an unknown format, the pixmap becomes a null pixmap.
<p>The parameters are passed on to <a href="qpixmap.html#a728cf">QPixmap::load</a>(). Dithering will be
performed if the file format uses more than 1 bit per pixel.
<p>See also <a href="qpixmap.html#7803c4">QPixmap::isNull</a>(), <a href="qpixmap.html#a728cf">QPixmap::load</a>(), <a href="qpixmap.html#79475e">QPixmap::loadFromData</a>(), <a href="qpixmap.html#a38b1c">QPixmap::save</a>() and <a href="qpixmap.html#360626">QPixmap::imageFormat</a>().
<h3 class="fn"><a name="9ee1bb"></a>QBitmap::QBitmap(constQBitmap&bitmap)</h3>
<p>Constructs a bitmap which is a copy of <em>bitmap.</em>
<h3 class="fn"><a name="12bed2"></a>QBitmap::QBitmap(intw, inth, boolclear=FALSE, <a href="qpixmap.html#Optimization">QPixmap::Optimization</a>optimization=QPixmap::DefaultOptim)</h3>
<p>Constructs a bitmap with <em>w</em> width and <em>h</em> height.
<p>The contents of the bitmap is uninitialized if <em>clear</em> is FALSE, otherwise
it is filled with pixel value 0 (the <a href="qcolor.html">QColor</a> <code>Qt::color0).</code>
<p>The optional <em>optimization</em> argument specifies the optimization
setting for the bitmap. The default optimization should be used
in most cases. Games and other pixmap-intensive applications may
benefit from setting this argument.
<p>See also <a href="qpixmap.html#41f5cf">QPixmap::setOptimization</a>() and <a href="qpixmap.html#7675b8">QPixmap::setDefaultOptimization</a>().
<h3 class="fn"><a name="c9b25d"></a>QBitmap::QBitmap(intw, inth, constuchar*bits, boolisXbitmap=FALSE)</h3>
<p>Constructs a bitmap with <em>w</em> width and <em>h</em> height and sets the contents
to <em>bits.</em>
<p>The <em>isXbitmap</em> should be TRUE if <em>bits</em> was generated by the
X11 bitmap program. The X bitmap bit order is little endian.
The <a href="qimage.html">QImage</a> documentation discusses bit order of monochrome images.
<p>Example (creates an arrow bitmap):
<pre> uchar arrow_bits[] = { 0x3f, 0x1f, 0x0f, 0x1f, 0x3b, 0x71, 0xe0, 0xc0 };
<a href="qbitmap.html">QBitmap</a> bm( 8, 8, arrow_bits, TRUE );
</pre>
<h3 class="fn"><a name="2c4ff2"></a>QBitmap::QBitmap(const<a href="qsize.html">QSize</a>&size, boolclear=FALSE, <a href="qpixmap.html#Optimization">QPixmap::Optimization</a>optimization=QPixmap::DefaultOptim)</h3>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
<h3 class="fn"><a name="29fa2b"></a>QBitmap::QBitmap(const<a href="qsize.html">QSize</a>&size, constuchar*bits, boolisXbitmap=FALSE)</h3>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
<h3 class="fn">QBitmap&<a name="cd1e18"></a>QBitmap::operator=(const<a href="qimage.html">QImage</a>&image)</h3>
<p>Converts the image <em>image</em> to a bitmap and assigns the result to
this bitmap. Returns a reference to the bitmap.
<p>Dithering will be performed if the image has a
<a href="qimage.html#682415">QImage::depth</a>() greater than 1.
<h3 class="fn">QBitmap&<a name="57c2bf"></a>QBitmap::operator=(const<a href="qpixmap.html">QPixmap</a>&pixmap)</h3>
<p>Assigns the pixmap <em>pixmap</em> to this bitmap and returns a reference to this
bitmap.
<p>Dithering will be performed if the pixmap has a
<a href="qpixmap.html#3c91c2">QPixmap::depth</a>() greater than 1.
<h3 class="fn">QBitmap&<a name="6d398d"></a>QBitmap::operator=(constQBitmap&bitmap)</h3>
<p>Assigns the bitmap <em>bitmap</em> to this bitmap and returns a reference to this
bitmap.
<h3 class="fn">QBitmap<a name="33c04b"></a>QBitmap::xForm(const<a href="qwmatrix.html">QWMatrix</a>&matrix)const</h3>
<p>Returns a transformed copy of this bitmap, using <em>matrix.</em>
<p>This function does exactly the same as <a href="qpixmap.html#ff5fcf">QPixmap::xForm</a>(), except that
it returns a QBitmap instead of a <a href="qpixmap.html">QPixmap</a>.
<p>See also <a href="qpixmap.html#ff5fcf">QPixmap::xForm</a>().
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