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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <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) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** 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: ** ** "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 Digia Plc and its Subsidiary(-ies) 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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QNetworkReply></span> <span class="preprocessor">#include <QNetworkRequest></span> <span class="preprocessor">#include <QNetworkAccessManager></span> <span class="preprocessor">#include <QNetworkDiskCache></span> <span class="preprocessor">#include "imageanalyzer.h"</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"><</span><span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span><span class="operator">></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">></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">></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">&</span> triplet<span class="operator">,</span> m_watcher<span class="operator">-</span><span class="operator">></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">></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">></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">&</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">></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">"User-Agent"</span><span class="operator">,</span> <span class="string">"Nokia - Custom QT app"</span>); m_network<span class="operator">-</span><span class="operator">></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">></span>error()) { <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Error code"</span> <span class="operator"><</span><span class="operator"><</span> pReply<span class="operator">-</span><span class="operator">></span>error(); <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Http code"</span> <span class="operator"><</span><span class="operator"><</span> pReply<span class="operator">-</span><span class="operator">></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">></span>deleteLater(); <span class="keyword">if</span> (image<span class="operator">.</span>isNull()) { <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"bad image"</span>; <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> pReply<span class="operator">-</span><span class="operator">></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">></span>rawHeaderList()) { <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> element <span class="operator"><</span><span class="operator"><</span> <span class="string">" = "</span> <span class="operator"><</span><span class="operator"><</span> pReply<span class="operator">-</span><span class="operator">></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"><</span><span class="type"><a href="qimage.html">QImage</a></span><span class="operator">></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"><</span><span class="operator"><</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">&</span><span class="operator">&</span> m_URLQueue<span class="operator">.</span>isEmpty()) { m_watcher<span class="operator">-</span><span class="operator">></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">&</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"><</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"><</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"><</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> </div> <!-- @@@webkit/imageanalyzer/imageanalyzer.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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