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<h1 class="title">imageanalyzer.cpp Example File</h1>
<span class="small-subtitle">webkit/imageanalyzer/imageanalyzer.cpp</span>
<!-- $$$webkit/imageanalyzer/imageanalyzer.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;QNetworkReply&gt;</span>
<span class="preprocessor">#include &lt;QNetworkRequest&gt;</span>
<span class="preprocessor">#include &lt;QNetworkAccessManager&gt;</span>
<span class="preprocessor">#include &lt;QNetworkDiskCache&gt;</span>
<span class="preprocessor">#include &quot;imageanalyzer.h&quot;</span>
<span class="comment">/*!
* This class operates as follows:
* Parent calls the slot startAnalysis which shoves a list of QStrings into URLQueue and then calls fetchURLs.
* FetchURLs sends out HTTP GETs for each image it can't get out of the cache.
* As the responses come in, handleReply tries to create an image out of each and pushes those images into imageQueue.
* On the last (detected by no outstandingFetches and URLQueue.isEmpty()) call to queueImage (from handleReply)
* a thread is forked to process all the images. When it finishes, it emits a finished signal that is received
* by our JavaScript code.
*/</span>
ImageAnalyzer<span class="operator">::</span>ImageAnalyzer(<span class="type"><a href="qnetworkdiskcache.html">QNetworkDiskCache</a></span><span class="operator">*</span> netcache<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span><span class="operator">*</span> parent)
: <span class="type"><a href="qobject.html">QObject</a></span>(parent)<span class="operator">,</span> m_cache(netcache)<span class="operator">,</span> m_outstandingFetches(<span class="number">0</span>)
{
<span class="comment">/* ImageAnalyzer only wants to receive http responses
for requests that it makes, so that's why it has its own
QNetworkAccessManager. */</span>
m_network <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qnetworkaccessmanager.html">QNetworkAccessManager</a></span>(<span class="keyword">this</span>);
m_watcher <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qfuturewatcher.html">QFutureWatcher</a></span><span class="operator">&lt;</span><span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span><span class="operator">&gt;</span>(<span class="keyword">this</span>);
<span class="comment">/* We want to share a cache with the web browser,
in case it has some images we want: */</span>
m_network<span class="operator">-</span><span class="operator">&gt;</span>setCache(m_cache);
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(m_network<span class="operator">,</span> SIGNAL(finished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(handleReply(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>)));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(m_watcher<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(doneProcessing()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(m_watcher<span class="operator">,</span> SIGNAL(progressValueChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(progressStatus(<span class="type">int</span>)));
}
ImageAnalyzer<span class="operator">::</span><span class="operator">~</span>ImageAnalyzer()
{
<span class="keyword">delete</span>(m_watcher);
}
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> ImageAnalyzer<span class="operator">::</span>lastResults()
{
<span class="type">int</span> rTot <span class="operator">=</span> <span class="number">0</span>;
<span class="type">int</span> bTot <span class="operator">=</span> <span class="number">0</span>;
<span class="type">int</span> gTot <span class="operator">=</span> <span class="number">0</span>;
<span class="type">int</span> count <span class="operator">=</span> m_watcher<span class="operator">-</span><span class="operator">&gt;</span>future()<span class="operator">.</span>results()<span class="operator">.</span>size();
foreach(<span class="keyword">const</span> <span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">&amp;</span> triplet<span class="operator">,</span> m_watcher<span class="operator">-</span><span class="operator">&gt;</span>future()<span class="operator">.</span>results())
{
rTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qRed">qRed</a>(triplet);
bTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qBlue">qBlue</a>(triplet);
gTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qGreen">qGreen</a>(triplet);
}
<span class="keyword">return</span> <a href="qcolor.html#qRgb">qRgb</a>(rTot<span class="operator">/</span>count<span class="operator">,</span> bTot<span class="operator">/</span>count<span class="operator">,</span> gTot<span class="operator">/</span>count);
}
<span class="type">float</span> ImageAnalyzer<span class="operator">::</span>lastRed() { <span class="keyword">return</span> <a href="qcolor.html#qRed">qRed</a>(lastResults())<span class="operator">/</span><span class="number">2.55</span>; }
<span class="type">float</span> ImageAnalyzer<span class="operator">::</span>lastGreen() { <span class="keyword">return</span> <a href="qcolor.html#qGreen">qGreen</a>(lastResults())<span class="operator">/</span><span class="number">2.55</span>; }
<span class="type">float</span> ImageAnalyzer<span class="operator">::</span>lastBlue() { <span class="keyword">return</span> <a href="qcolor.html#qBlue">qBlue</a>(lastResults())<span class="operator">/</span><span class="number">2.55</span>; }
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>progressStatus(<span class="type">int</span> newstat)
{
<span class="keyword">emit</span> updateProgress(newstat<span class="operator">,</span> m_watcher<span class="operator">-</span><span class="operator">&gt;</span>progressMaximum());
}
<span class="type">bool</span> ImageAnalyzer<span class="operator">::</span>isBusy()
{
<span class="keyword">return</span> m_watcher<span class="operator">-</span><span class="operator">&gt;</span>isRunning();
}
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>startAnalysis(<span class="keyword">const</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> <span class="operator">&amp;</span> urls)
{
m_URLQueue <span class="operator">=</span> urls;
fetchURLs();
}
<span class="comment">/*!
* Analyzes the entire queue - just starts all our http GETs.
*/</span>
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>fetchURLs()
{
<span class="keyword">while</span> (<span class="operator">!</span>m_URLQueue<span class="operator">.</span>isEmpty())
{
<span class="type"><a href="qstring.html">QString</a></span> url <span class="operator">=</span> m_URLQueue<span class="operator">.</span>takeFirst();
<span class="type"><a href="qurl.html">QUrl</a></span> URL <span class="operator">=</span> <span class="type"><a href="qurl.html">QUrl</a></span>(url);
<span class="type"><a href="qiodevice.html">QIODevice</a></span> <span class="operator">*</span> pData <span class="operator">=</span> m_cache<span class="operator">-</span><span class="operator">&gt;</span>data(URL);
<span class="comment">// Is image already loaded in cache?</span>
<span class="keyword">if</span> (pData <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="comment">// HTTP Get image over network.</span>
m_outstandingFetches<span class="operator">+</span><span class="operator">+</span>;
<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span> request <span class="operator">=</span> <span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span>(URL);
request<span class="operator">.</span>setRawHeader(<span class="string">&quot;User-Agent&quot;</span><span class="operator">,</span> <span class="string">&quot;Nokia - Custom QT app&quot;</span>);
m_network<span class="operator">-</span><span class="operator">&gt;</span>get(request);
} <span class="keyword">else</span> {
<span class="comment">// Get image from cache</span>
<span class="type"><a href="qimage.html">QImage</a></span> image;
image<span class="operator">.</span>load(pData<span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">if</span> (<span class="operator">!</span>image<span class="operator">.</span>isNull())
queueImage(image);
<span class="keyword">delete</span>(pData);
}
}
}
<span class="comment">/*
* Slot to handle the incoming responses from our http GETs
*/</span>
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>handleReply(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span> pReply)
{
m_outstandingFetches<span class="operator">-</span><span class="operator">-</span>;
<span class="keyword">if</span> (pReply<span class="operator">-</span><span class="operator">&gt;</span>error()) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Error code&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> pReply<span class="operator">-</span><span class="operator">&gt;</span>error();
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Http code&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> pReply<span class="operator">-</span><span class="operator">&gt;</span>attribute(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span><span class="operator">::</span>HttpStatusCodeAttribute);
<span class="keyword">return</span>;
}
<span class="type"><a href="qimage.html">QImage</a></span> image;
image<span class="operator">.</span>load(pReply<span class="operator">,</span> <span class="number">0</span>);
pReply<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
<span class="keyword">if</span> (image<span class="operator">.</span>isNull()) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;bad image&quot;</span>;
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> pReply<span class="operator">-</span><span class="operator">&gt;</span>rawHeaderList();
foreach(<span class="type"><a href="qbytearray.html">QByteArray</a></span> element<span class="operator">,</span> pReply<span class="operator">-</span><span class="operator">&gt;</span>rawHeaderList()) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> element <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot; = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> pReply<span class="operator">-</span><span class="operator">&gt;</span>rawHeader(element);
}
<span class="keyword">return</span>;
}
queueImage(image);
}
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>doneProcessing()
{
m_imageQueue <span class="operator">=</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qimage.html">QImage</a></span><span class="operator">&gt;</span>();
<span class="keyword">emit</span> finishedAnalysis();
}
<span class="type">void</span> ImageAnalyzer<span class="operator">::</span>queueImage(<span class="type"><a href="qimage.html">QImage</a></span> img)
{
<span class="keyword">if</span> (<span class="operator">!</span>img<span class="operator">.</span>isNull())
m_imageQueue <span class="operator">&lt;</span><span class="operator">&lt;</span> img;
<span class="keyword">if</span> (m_outstandingFetches <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> m_URLQueue<span class="operator">.</span>isEmpty()) {
m_watcher<span class="operator">-</span><span class="operator">&gt;</span>setFuture(<span class="type"><a href="qtconcurrent.html">QtConcurrent</a></span><span class="operator">::</span>mapped(m_imageQueue<span class="operator">,</span> averageRGB));
}
}
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> averageRGB(<span class="keyword">const</span> <span class="type"><a href="qimage.html">QImage</a></span> <span class="operator">&amp;</span>img)
{
<span class="type">int</span> pixelCount <span class="operator">=</span> img<span class="operator">.</span>width() <span class="operator">*</span> img<span class="operator">.</span>height();
<span class="type">int</span> rAvg<span class="operator">,</span> gAvg<span class="operator">,</span> bAvg;
<span class="comment">// We waste some time here:</span>
<span class="keyword">for</span> (<span class="type">int</span> timeWaster<span class="operator">=</span><span class="number">0</span>; timeWaster <span class="operator">&lt;</span> <span class="number">100</span>; timeWaster<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qtglobal.html#quint64-typedef">quint64</a></span> rTot <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#quint64-typedef">quint64</a></span> gTot <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#quint64-typedef">quint64</a></span> bTot <span class="operator">=</span> <span class="number">0</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> img<span class="operator">.</span>width(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="keyword">for</span> (<span class="type">int</span> j<span class="operator">=</span><span class="number">0</span>; j <span class="operator">&lt;</span> img<span class="operator">.</span>height(); j<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> pixel <span class="operator">=</span> img<span class="operator">.</span>pixel(i<span class="operator">,</span>j);
rTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qRed">qRed</a>(pixel);
gTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qGreen">qGreen</a>(pixel);
bTot <span class="operator">+</span><span class="operator">=</span> <a href="qcolor.html#qBlue">qBlue</a>(pixel);
}
}
rAvg <span class="operator">=</span> (rTot)<span class="operator">/</span>(pixelCount);
gAvg <span class="operator">=</span> (gTot)<span class="operator">/</span>(pixelCount);
bAvg <span class="operator">=</span> (bTot)<span class="operator">/</span>(pixelCount);
}
<span class="keyword">return</span> <a href="qcolor.html#qRgb">qRgb</a>(rAvg<span class="operator">,</span> gAvg<span class="operator">,</span> bAvg);
}</pre>
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