Added example that uses WebKit to capture Web page frames.

The framecapture is based on GraphicsDojo/WebCapture
and shows how to use WebKit toolkit to capture a web
page and save its internal frames in different image
files using the new property QWebFrame::clipRenderToViewPort.

Merge-request: 1103
Reviewed-by: Ariya Hidayat <ariya.hidayat@nokia.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/examples/webkit/framecapture/framecapture.cpp b/examples/webkit/framecapture/framecapture.cpp
new file mode 100644
index 0000000..ef31f6d
--- /dev/null
+++ b/examples/webkit/framecapture/framecapture.cpp
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "framecapture.h"
+
+#include <iostream>
+#include <QtWebKit>
+
+FrameCapture::FrameCapture(): QObject(), m_percent(0)
+{
+    connect(&m_page, SIGNAL(loadProgress(int)), this, SLOT(printProgress(int)));
+    connect(&m_page, SIGNAL(loadFinished(bool)), this, SLOT(saveResult(bool)));
+}
+
+void FrameCapture::load(const QUrl &url, const QString &outputFileName)
+{
+    std::cout << "Loading " << qPrintable(url.toString()) << std::endl;
+    m_percent = 0;
+    int index = outputFileName.lastIndexOf('.');
+    m_fileName = (index == -1) ? outputFileName + ".png" : outputFileName;
+    m_page.mainFrame()->load(url);
+    m_page.mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
+    m_page.mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
+}
+
+void FrameCapture::printProgress(int percent)
+{
+    if (m_percent >= percent)
+        return;
+
+    while (m_percent++ < percent)
+        std::cout << "#" << std::flush;
+}
+
+void FrameCapture::saveResult(bool ok)
+{
+    std::cout << std::endl;
+
+    // crude error-checking
+    if (!ok) {
+        std::cerr << "Failed loading " << qPrintable(m_page.mainFrame()->url().toString()) << std::endl;
+        emit finished();
+        return;
+    }
+
+    // save each internal frame in different image files
+    int frameCounter = 0;
+    foreach(QWebFrame *frame, m_page.mainFrame()->childFrames()) {
+        QString fileName(m_fileName);
+        int index = m_fileName.lastIndexOf('.');
+        fileName = fileName.insert(index, "_frame" + QString::number(++frameCounter));
+
+        frame->setClipRenderToViewport(false);
+
+        QImage image(frame->contentsSize(), QImage::Format_ARGB32_Premultiplied);
+        image.fill(Qt::transparent);
+
+        saveFrame(frame, image, fileName);
+    }
+
+    // save the main frame
+    m_page.setViewportSize(m_page.mainFrame()->contentsSize());
+    QImage image(m_page.mainFrame()->contentsSize(), QImage::Format_ARGB32_Premultiplied);
+    image.fill(Qt::transparent);
+    saveFrame(m_page.mainFrame(), image, m_fileName);
+
+    emit finished();
+}
+
+void FrameCapture::saveFrame(QWebFrame *frame, QImage image, QString fileName)
+{
+    QPainter painter(&image);
+    painter.setRenderHint(QPainter::Antialiasing, true);
+    painter.setRenderHint(QPainter::TextAntialiasing, true);
+    painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
+
+    frame->render(&painter);
+
+    painter.end();
+
+    image.save(fileName);
+}
+