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* [svn-r9723] Purpose:before_signed_unsigned_changesQuincey Koziol2004-12-291-0/+39
generated by cgit v0.12 at 2024-09-06 03:36:20 (GMT)
option value='bug_92e028b41b'>bug_92e028b41b Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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the demo so that the analysis
+takes a noticeable time to complete.
+
+\snippet examples/webkit/imageanalyzer/imageanalyzer.cpp ImageAnalyzer - averageRGB
+
+*/
+
diff --git a/doc/src/getting-started/examples.qdoc b/doc/src/getting-started/examples.qdoc
index bfe7be9..398eee8 100644
--- a/doc/src/getting-started/examples.qdoc
+++ b/doc/src/getting-started/examples.qdoc
@@ -32,7 +32,7 @@
Qt includes a set of examples that cover nearly every aspect of Qt
development. They aren't meant to be impressive when you run them,
but in each case the source code has been carefully written to
- illustrate one or more best Qt programming practices.
+ illustrate one or more best Qt programming practices.
You can run the examples from the \l{Examples and Demos Launcher}
application (except see \l{QML Examples and Demos} {QML Examples}
@@ -764,6 +764,9 @@
\row \o \l{webkit/googlechat}{Google Chat}
\o A real-world example that shows how an existing Web-based service can be accessed
using QtWebKit.
+ \row \o \l{webkit/imageanalyzer}{Image Analyzer}\raisedaster
+ \o A \l{The QtWebKit Bridge}{QtWebKit bridge} application which contains a
+ web interface and client-side processing.
\row \o \l{webkit/previewer}{Previewer}\raisedaster
\o Shows how to make a simple Web page previewer by using Qt's text input widgets
together with a QWebView widget.
@@ -776,7 +779,7 @@
*/
/*!
- \page examples-helpsystem.html
+ \page examples-helpsystem.html
\ingroup all-examples
\title Help System Examples
\brief Adding interactive help to your Qt application.
diff --git a/doc/src/images/webkit-imageanalyzer-complete.png b/doc/src/images/webkit-imageanalyzer-complete.png
new file mode 100644
index 0000000..47c0ee1
--- /dev/null
+++ b/doc/src/images/webkit-imageanalyzer-complete.png
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diff --git a/doc/src/images/webkit-imageanalyzer-progress.png b/doc/src/images/webkit-imageanalyzer-progress.png
new file mode 100644
index 0000000..5bab890
--- /dev/null
+++ b/doc/src/images/webkit-imageanalyzer-progress.png
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diff --git a/doc/src/images/webkit-imageanalyzer-screenshot.png b/doc/src/images/webkit-imageanalyzer-screenshot.png
new file mode 100644
index 0000000..987f8a2
--- /dev/null
+++ b/doc/src/images/webkit-imageanalyzer-screenshot.png
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diff --git a/examples/webkit/imageanalyzer/README b/examples/webkit/imageanalyzer/README
new file mode 100644
index 0000000..9415b57
--- /dev/null
+++ b/examples/webkit/imageanalyzer/README
@@ -0,0 +1,20 @@
+This example demonstrates the use of Qt WebKit to make a hybrid application.
+
+Build instructions:
+
+ On Mac OS X:
+ In this directory:
+ qmake -spec macx-g++
+ make clean all
+ open imageanalyzer.app
+ On Linux/Unix:
+ In this directory:
+ qmake
+ make clean all
+ ./imageanalyzer
+
+ On Windows:
+ In this directory:
+ qmake
+ nmake clean all
+ debug\imageanalyzer.exe
diff --git a/examples/webkit/imageanalyzer/imageanalyzer.cpp b/examples/webkit/imageanalyzer/imageanalyzer.cpp
new file mode 100644
index 0000000..c663cf3
--- /dev/null
+++ b/examples/webkit/imageanalyzer/imageanalyzer.cpp
@@ -0,0 +1,222 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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 Nokia Corporation 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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QNetworkAccessManager>
+#include <QNetworkDiskCache>
+#include "imageanalyzer.h"
+
+/*!
+ * 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 trys 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.
+ */
+
+//! [ ImageAnalyzer - Constructor ]
+ImageAnalyzer::ImageAnalyzer(QNetworkDiskCache* netcache, QObject* parent)
+: QObject(parent), m_cache(netcache), m_outstandingFetches(0)
+{
+ /* ImageAnalyzer only wants to receive http responses
+ for requests that it makes, so that's why it has its own
+ QNetworkAccessManager. */
+ m_network = new QNetworkAccessManager(this);
+ m_watcher = new QFutureWatcher<QRgb>(this);
+ /* We want to share a cache with the web browser,
+ in case it has some images we want: */
+ m_network->setCache(m_cache);
+
+ QObject::connect(m_network, SIGNAL(finished(QNetworkReply*)),
+ this, SLOT(handleReply(QNetworkReply*)));
+ QObject::connect(m_watcher, SIGNAL(finished()),
+ this, SLOT(doneProcessing()));
+ QObject::connect(m_watcher, SIGNAL(progressValueChanged(int)),
+ this, SLOT(progressStatus(int)));
+}
+//! [ ImageAnalyzer - Constructor ]
+ImageAnalyzer::~ImageAnalyzer()
+{
+ delete(m_watcher);
+}
+
+
+QRgb ImageAnalyzer::lastResults()
+{
+ int rTot = 0;
+ int bTot = 0;
+ int gTot = 0;
+ int count = m_watcher->future().results().size();
+ foreach(const QRgb & triplet, m_watcher->future().results())
+ {
+ rTot += qRed(triplet);
+ bTot += qBlue(triplet);
+ gTot += qGreen(triplet);
+ }
+ return qRgb(rTot/count, bTot/count, gTot/count);
+}
+
+float ImageAnalyzer::lastRed() { return qRed(lastResults())/2.55; }
+float ImageAnalyzer::lastGreen() { return qGreen(lastResults())/2.55; }
+float ImageAnalyzer::lastBlue() { return qBlue(lastResults())/2.55; }
+
+void ImageAnalyzer::progressStatus(int newstat)
+{
+ emit updateProgress(newstat, m_watcher->progressMaximum());
+}
+
+
+bool ImageAnalyzer::isBusy()
+{
+ return m_watcher->isRunning();
+}
+
+
+//! [ ImageAnalyzer - startAnalysis ]
+void ImageAnalyzer::startAnalysis(const QStringList & urls)
+{
+ m_URLQueue = urls;
+ fetchURLs();
+}
+//! [ ImageAnalyzer - startAnalysis ]
+
+/*!
+ * Analyzes the entire queue - just starts all our http GETs.
+ */
+//! [ ImageAnalyzer - fetchURLs ]
+void ImageAnalyzer::fetchURLs()
+{
+ while (!m_URLQueue.isEmpty())
+ {
+ QString url = m_URLQueue.takeFirst();
+ QUrl URL = QUrl(url);
+ QIODevice * pData = m_cache->data(URL);
+ // Is image already loaded in cache?
+ if (pData == 0) {
+ // HTTP Get image over network.
+ m_outstandingFetches++;
+ QNetworkRequest request = QNetworkRequest(URL);
+ request.setRawHeader("User-Agent", "Nokia - Custom QT app");
+ m_network->get(request);
+ } else {
+ // Get image from cache
+ QImage image;
+ image.load(pData, 0);
+ if (!image.isNull())
+ queueImage(image);
+ delete(pData);
+ }
+ }
+}
+//! [ ImageAnalyzer - fetchURLs ]
+/*
+ * Slot to handle the incoming responses from our http GETs
+ */
+//! [ ImageAnalyzer - handleReply ]
+void ImageAnalyzer::handleReply(QNetworkReply * pReply)
+{
+ m_outstandingFetches--;
+ if (pReply->error()) {
+ qDebug() << "Error code" << pReply->error();
+ qDebug() << "Http code" << pReply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
+ return;
+ }
+ QImage image;
+ image.load(pReply, 0);
+ pReply->deleteLater();
+ if (image.isNull()) {
+ qDebug() << "bad image";
+ qDebug() << pReply->rawHeaderList();
+ foreach(QByteArray element, pReply->rawHeaderList()) {
+ qDebug() << element << " = " << pReply->rawHeader(element);
+ }
+ return;
+ }
+ queueImage(image);
+}
+//! [ ImageAnalyzer - handleReply ]
+
+void ImageAnalyzer::doneProcessing()
+{
+ m_imageQueue = QList<QImage>();
+ emit finishedAnalysis();
+}
+//! [ ImageAnalyzer - queueImage ]
+void ImageAnalyzer::queueImage(QImage img)
+{
+ if (!img.isNull())
+ m_imageQueue << img;
+
+ if (m_outstandingFetches == 0 && m_URLQueue.isEmpty()) {
+ m_watcher->setFuture(QtConcurrent::mapped(m_imageQueue, averageRGB));
+ }
+}
+//! [ ImageAnalyzer - queueImage ]
+
+//! [ ImageAnalyzer - averageRGB ]
+QRgb averageRGB(const QImage &img)
+{
+ int pixelCount = img.width() * img.height();
+ int rAvg, gAvg, bAvg;
+
+ // We waste some time here:
+ for (int timeWaster=0; timeWaster < 100; timeWaster++) {
+ quint64 rTot = 0;
+ quint64 gTot = 0;
+ quint64 bTot = 0;
+ for (int i=0; i < img.width(); i++) {
+ for (int j=0; j < img.height(); j++) {
+ QRgb pixel = img.pixel(i,j);
+ rTot += qRed(pixel);
+ gTot += qGreen(pixel);
+ bTot += qBlue(pixel);
+ }
+ }
+ rAvg = (rTot)/(pixelCount);
+ gAvg = (gTot)/(pixelCount);
+ bAvg = (bTot)/(pixelCount);
+ }
+ return qRgb(rAvg, gAvg, bAvg);
+}
+//! [ ImageAnalyzer - averageRGB ]
diff --git a/examples/webkit/imageanalyzer/imageanalyzer.h b/examples/webkit/imageanalyzer/imageanalyzer.h
new file mode 100644