--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/painting/imagecomposition/imagecomposer.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,209 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "imagecomposer.h"
+
+//! [0]
+static const QSize resultSize(200, 200);
+//! [0]
+
+//! [1]
+ImageComposer::ImageComposer()
+{
+    sourceButton = new QToolButton;
+    sourceButton->setIconSize(resultSize);
+
+    operatorComboBox = new QComboBox;
+    addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver"));
+    addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver"));
+    addOp(QPainter::CompositionMode_Clear, tr("Clear"));
+    addOp(QPainter::CompositionMode_Source, tr("Source"));
+    addOp(QPainter::CompositionMode_Destination, tr("Destination"));
+    addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn"));
+    addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn"));
+    addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut"));
+    addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut"));
+    addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop"));
+    addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop"));
+    addOp(QPainter::CompositionMode_Xor, tr("Xor"));
+    addOp(QPainter::CompositionMode_Plus, tr("Plus"));
+    addOp(QPainter::CompositionMode_Multiply, tr("Multiply"));
+    addOp(QPainter::CompositionMode_Screen, tr("Screen"));
+    addOp(QPainter::CompositionMode_Overlay, tr("Overlay"));
+    addOp(QPainter::CompositionMode_Darken, tr("Darken"));
+    addOp(QPainter::CompositionMode_Lighten, tr("Lighten"));
+    addOp(QPainter::CompositionMode_ColorDodge, tr("ColorDodge"));
+    addOp(QPainter::CompositionMode_ColorBurn, tr("ColorBurn"));
+    addOp(QPainter::CompositionMode_HardLight, tr("HardLight"));
+    addOp(QPainter::CompositionMode_SoftLight, tr("SoftLight"));
+    addOp(QPainter::CompositionMode_Difference, tr("Difference"));
+    addOp(QPainter::CompositionMode_Exclusion, tr("Exclusion"));
+//! [1]
+
+//! [2]
+    destinationButton = new QToolButton;
+    destinationButton->setIconSize(resultSize);
+
+    equalLabel = new QLabel(tr("="));
+
+    resultLabel = new QLabel;
+    resultLabel->setMinimumWidth(resultSize.width());
+//! [2]
+
+//! [3]
+    connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource()));
+    connect(operatorComboBox, SIGNAL(activated(int)),
+            this, SLOT(recalculateResult()));
+    connect(destinationButton, SIGNAL(clicked()),
+            this, SLOT(chooseDestination()));
+//! [3]
+
+//! [4]
+    QGridLayout *mainLayout = new QGridLayout;
+    mainLayout->addWidget(sourceButton, 0, 0, 3, 1);
+    mainLayout->addWidget(operatorComboBox, 1, 1);
+    mainLayout->addWidget(destinationButton, 0, 2, 3, 1);
+    mainLayout->addWidget(equalLabel, 1, 3);
+    mainLayout->addWidget(resultLabel, 0, 4, 3, 1);
+    mainLayout->setSizeConstraint(QLayout::SetFixedSize);
+    setLayout(mainLayout);
+//! [4]
+
+//! [5]
+    resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied);
+
+    loadImage(":/images/butterfly.png", &sourceImage, sourceButton);
+    loadImage(":/images/checker.png", &destinationImage, destinationButton);
+
+    setWindowTitle(tr("Image Composition"));
+}
+//! [5]
+
+//! [6]
+void ImageComposer::chooseSource()
+{
+    chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton);
+}
+//! [6]
+
+//! [7]
+void ImageComposer::chooseDestination()
+{
+    chooseImage(tr("Choose Destination Image"), &destinationImage,
+                destinationButton);
+}
+//! [7]
+
+//! [8]
+void ImageComposer::recalculateResult()
+{
+    QPainter::CompositionMode mode = currentMode();
+
+    QPainter painter(&resultImage);
+    painter.setCompositionMode(QPainter::CompositionMode_Source);
+    painter.fillRect(resultImage.rect(), Qt::transparent);
+    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+    painter.drawImage(0, 0, destinationImage);
+    painter.setCompositionMode(mode);
+    painter.drawImage(0, 0, sourceImage);
+    painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
+    painter.fillRect(resultImage.rect(), Qt::white);
+    painter.end();
+
+    resultLabel->setPixmap(QPixmap::fromImage(resultImage));
+}
+//! [8]
+
+//! [9]
+void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name)
+{
+    operatorComboBox->addItem(name, mode);
+}
+//! [9]
+
+//! [10]
+void ImageComposer::chooseImage(const QString &title, QImage *image,
+                                QToolButton *button)
+{
+    QString fileName = QFileDialog::getOpenFileName(this, title);
+    if (!fileName.isEmpty())
+        loadImage(fileName, image, button);
+}
+//! [10]
+
+//! [11]
+void ImageComposer::loadImage(const QString &fileName, QImage *image,
+                              QToolButton *button)
+{
+    image->load(fileName);
+
+    QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied);
+    QPainter painter(&fixedImage);
+    painter.setCompositionMode(QPainter::CompositionMode_Source);
+    painter.fillRect(fixedImage.rect(), Qt::transparent);
+    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+    painter.drawImage(imagePos(*image), *image);
+    painter.end();
+    button->setIcon(QPixmap::fromImage(fixedImage));
+
+    *image = fixedImage;
+
+    recalculateResult();
+}
+//! [11]
+
+//! [12]
+QPainter::CompositionMode ImageComposer::currentMode() const
+{
+    return (QPainter::CompositionMode)
+           operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt();
+}
+//! [12]
+
+//! [13]
+QPoint ImageComposer::imagePos(const QImage &image) const
+{
+    return QPoint((resultSize.width() - image.width()) / 2,
+                  (resultSize.height() - image.height()) / 2);
+}
+//! [13]