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<h1 class="title">renderthread.cpp Example File</h1>
<span class="small-subtitle">threads/mandelbrot/renderthread.cpp</span>
<!-- $$$threads/mandelbrot/renderthread.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &lt;math.h&gt;</span>
<span class="preprocessor">#include &quot;renderthread.h&quot;</span>
RenderThread<span class="operator">::</span>RenderThread(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qthread.html">QThread</a></span>(parent)
{
restart <span class="operator">=</span> <span class="keyword">false</span>;
abort <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> ColormapSize; <span class="operator">+</span><span class="operator">+</span>i)
colormap<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> rgbFromWaveLength(<span class="number">380.0</span> <span class="operator">+</span> (i <span class="operator">*</span> <span class="number">400.0</span> <span class="operator">/</span> ColormapSize));
}
RenderThread<span class="operator">::</span><span class="operator">~</span>RenderThread()
{
mutex<span class="operator">.</span>lock();
abort <span class="operator">=</span> <span class="keyword">true</span>;
condition<span class="operator">.</span>wakeOne();
mutex<span class="operator">.</span>unlock();
wait();
}
<span class="type">void</span> RenderThread<span class="operator">::</span>render(<span class="type">double</span> centerX<span class="operator">,</span> <span class="type">double</span> centerY<span class="operator">,</span> <span class="type">double</span> scaleFactor<span class="operator">,</span>
<span class="type"><a href="qsize.html">QSize</a></span> resultSize)
{
<span class="type"><a href="qmutexlocker.html">QMutexLocker</a></span> locker(<span class="operator">&amp;</span>mutex);
<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>centerX <span class="operator">=</span> centerX;
<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>centerY <span class="operator">=</span> centerY;
<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>scaleFactor <span class="operator">=</span> scaleFactor;
<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>resultSize <span class="operator">=</span> resultSize;
<span class="keyword">if</span> (<span class="operator">!</span>isRunning()) {
start(LowPriority);
} <span class="keyword">else</span> {
restart <span class="operator">=</span> <span class="keyword">true</span>;
condition<span class="operator">.</span>wakeOne();
}
}
<span class="type">void</span> RenderThread<span class="operator">::</span>run()
{
forever {
mutex<span class="operator">.</span>lock();
<span class="type"><a href="qsize.html">QSize</a></span> resultSize <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>resultSize;
<span class="type">double</span> scaleFactor <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>scaleFactor;
<span class="type">double</span> centerX <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>centerX;
<span class="type">double</span> centerY <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>centerY;
mutex<span class="operator">.</span>unlock();
<span class="type">int</span> halfWidth <span class="operator">=</span> resultSize<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span>;
<span class="type">int</span> halfHeight <span class="operator">=</span> resultSize<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span>;
<span class="type"><a href="qimage.html">QImage</a></span> image(resultSize<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
<span class="keyword">const</span> <span class="type">int</span> NumPasses <span class="operator">=</span> <span class="number">8</span>;
<span class="type">int</span> pass <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (pass <span class="operator">&lt;</span> NumPasses) {
<span class="keyword">const</span> <span class="type">int</span> MaxIterations <span class="operator">=</span> (<span class="number">1</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> (<span class="number">2</span> <span class="operator">*</span> pass <span class="operator">+</span> <span class="number">6</span>)) <span class="operator">+</span> <span class="number">32</span>;
<span class="keyword">const</span> <span class="type">int</span> Limit <span class="operator">=</span> <span class="number">4</span>;
<span class="type">bool</span> allBlack <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="operator">-</span>halfHeight; y <span class="operator">&lt;</span> halfHeight; <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">if</span> (restart)
<span class="keyword">break</span>;
<span class="keyword">if</span> (abort)
<span class="keyword">return</span>;
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span>scanLine <span class="operator">=</span>
<span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(image<span class="operator">.</span>scanLine(y <span class="operator">+</span> halfHeight));
<span class="type">double</span> ay <span class="operator">=</span> centerY <span class="operator">+</span> (y <span class="operator">*</span> scaleFactor);
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="operator">-</span>halfWidth; x <span class="operator">&lt;</span> halfWidth; <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">double</span> ax <span class="operator">=</span> centerX <span class="operator">+</span> (x <span class="operator">*</span> scaleFactor);
<span class="type">double</span> a1 <span class="operator">=</span> ax;
<span class="type">double</span> b1 <span class="operator">=</span> ay;
<span class="type">int</span> numIterations <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">do</span> {
<span class="operator">+</span><span class="operator">+</span>numIterations;
<span class="type">double</span> a2 <span class="operator">=</span> (a1 <span class="operator">*</span> a1) <span class="operator">-</span> (b1 <span class="operator">*</span> b1) <span class="operator">+</span> ax;
<span class="type">double</span> b2 <span class="operator">=</span> (<span class="number">2</span> <span class="operator">*</span> a1 <span class="operator">*</span> b1) <span class="operator">+</span> ay;
<span class="keyword">if</span> ((a2 <span class="operator">*</span> a2) <span class="operator">+</span> (b2 <span class="operator">*</span> b2) <span class="operator">&gt;</span> Limit)
<span class="keyword">break</span>;
<span class="operator">+</span><span class="operator">+</span>numIterations;
a1 <span class="operator">=</span> (a2 <span class="operator">*</span> a2) <span class="operator">-</span> (b2 <span class="operator">*</span> b2) <span class="operator">+</span> ax;
b1 <span class="operator">=</span> (<span class="number">2</span> <span class="operator">*</span> a2 <span class="operator">*</span> b2) <span class="operator">+</span> ay;
<span class="keyword">if</span> ((a1 <span class="operator">*</span> a1) <span class="operator">+</span> (b1 <span class="operator">*</span> b1) <span class="operator">&gt;</span> Limit)
<span class="keyword">break</span>;
} <span class="keyword">while</span> (numIterations <span class="operator">&lt;</span> MaxIterations);
<span class="keyword">if</span> (numIterations <span class="operator">&lt;</span> MaxIterations) {
<span class="operator">*</span>scanLine<span class="operator">+</span><span class="operator">+</span> <span class="operator">=</span> colormap<span class="operator">[</span>numIterations <span class="operator">%</span> ColormapSize<span class="operator">]</span>;
allBlack <span class="operator">=</span> <span class="keyword">false</span>;
} <span class="keyword">else</span> {
<span class="operator">*</span>scanLine<span class="operator">+</span><span class="operator">+</span> <span class="operator">=</span> <a href="qcolor.html#qRgb">qRgb</a>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
}
}
}
<span class="keyword">if</span> (allBlack <span class="operator">&amp;</span><span class="operator">&amp;</span> pass <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
pass <span class="operator">=</span> <span class="number">4</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (<span class="operator">!</span>restart)
<span class="keyword">emit</span> renderedImage(image<span class="operator">,</span> scaleFactor);
<span class="operator">+</span><span class="operator">+</span>pass;
}
}
mutex<span class="operator">.</span>lock();
<span class="keyword">if</span> (<span class="operator">!</span>restart)
condition<span class="operator">.</span>wait(<span class="operator">&amp;</span>mutex);
restart <span class="operator">=</span> <span class="keyword">false</span>;
mutex<span class="operator">.</span>unlock();
}
}
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> RenderThread<span class="operator">::</span>rgbFromWaveLength(<span class="type">double</span> wave)
{
<span class="type">double</span> r <span class="operator">=</span> <span class="number">0.0</span>;
<span class="type">double</span> g <span class="operator">=</span> <span class="number">0.0</span>;
<span class="type">double</span> b <span class="operator">=</span> <span class="number">0.0</span>;
<span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">380.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">440.0</span>) {
r <span class="operator">=</span> <span class="operator">-</span><span class="number">1.0</span> <span class="operator">*</span> (wave <span class="operator">-</span> <span class="number">440.0</span>) <span class="operator">/</span> (<span class="number">440.0</span> <span class="operator">-</span> <span class="number">380.0</span>);
b <span class="operator">=</span> <span class="number">1.0</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">440.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">490.0</span>) {
g <span class="operator">=</span> (wave <span class="operator">-</span> <span class="number">440.0</span>) <span class="operator">/</span> (<span class="number">490.0</span> <span class="operator">-</span> <span class="number">440.0</span>);
b <span class="operator">=</span> <span class="number">1.0</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">490.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">510.0</span>) {
g <span class="operator">=</span> <span class="number">1.0</span>;
b <span class="operator">=</span> <span class="operator">-</span><span class="number">1.0</span> <span class="operator">*</span> (wave <span class="operator">-</span> <span class="number">510.0</span>) <span class="operator">/</span> (<span class="number">510.0</span> <span class="operator">-</span> <span class="number">490.0</span>);
} <span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">510.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">580.0</span>) {
r <span class="operator">=</span> (wave <span class="operator">-</span> <span class="number">510.0</span>) <span class="operator">/</span> (<span class="number">580.0</span> <span class="operator">-</span> <span class="number">510.0</span>);
g <span class="operator">=</span> <span class="number">1.0</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">580.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">645.0</span>) {
r <span class="operator">=</span> <span class="number">1.0</span>;
g <span class="operator">=</span> <span class="operator">-</span><span class="number">1.0</span> <span class="operator">*</span> (wave <span class="operator">-</span> <span class="number">645.0</span>) <span class="operator">/</span> (<span class="number">645.0</span> <span class="operator">-</span> <span class="number">580.0</span>);
} <span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">645.0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> wave <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">780.0</span>) {
r <span class="operator">=</span> <span class="number">1.0</span>;
}
<span class="type">double</span> s <span class="operator">=</span> <span class="number">1.0</span>;
<span class="keyword">if</span> (wave <span class="operator">&gt;</span> <span class="number">700.0</span>)
s <span class="operator">=</span> <span class="number">0.3</span> <span class="operator">+</span> <span class="number">0.7</span> <span class="operator">*</span> (<span class="number">780.0</span> <span class="operator">-</span> wave) <span class="operator">/</span> (<span class="number">780.0</span> <span class="operator">-</span> <span class="number">700.0</span>);
<span class="keyword">else</span> <span class="keyword">if</span> (wave <span class="operator">&lt;</span> <span class="number">420.0</span>)
s <span class="operator">=</span> <span class="number">0.3</span> <span class="operator">+</span> <span class="number">0.7</span> <span class="operator">*</span> (wave <span class="operator">-</span> <span class="number">380.0</span>) <span class="operator">/</span> (<span class="number">420.0</span> <span class="operator">-</span> <span class="number">380.0</span>);
r <span class="operator">=</span> pow(r <span class="operator">*</span> s<span class="operator">,</span> <span class="number">0.8</span>);
g <span class="operator">=</span> pow(g <span class="operator">*</span> s<span class="operator">,</span> <span class="number">0.8</span>);
b <span class="operator">=</span> pow(b <span class="operator">*</span> s<span class="operator">,</span> <span class="number">0.8</span>);
<span class="keyword">return</span> <a href="qcolor.html#qRgb">qRgb</a>(<span class="type">int</span>(r <span class="operator">*</span> <span class="number">255</span>)<span class="operator">,</span> <span class="type">int</span>(g <span class="operator">*</span> <span class="number">255</span>)<span class="operator">,</span> <span class="type">int</span>(b <span class="operator">*</span> <span class="number">255</span>));
}</pre>
</div>
<!-- @@@threads/mandelbrot/renderthread.cpp -->
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