qt 6.5.1 original

examples/widgets/painting/imagecomposition/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(imagecomposition LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/painting/imagecomposition")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(imagecomposition
+    imagecomposer.cpp imagecomposer.h
+    main.cpp
+)
+
+set_target_properties(imagecomposition PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(imagecomposition PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(imagecomposition_resource_files
+    "images/butterfly.png"
+    "images/checker.png"
+)
+
+qt_add_resources(imagecomposition "imagecomposition"
+    PREFIX
+        "/"
+    FILES
+        ${imagecomposition_resource_files}
+)
+
+install(TARGETS imagecomposition
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/painting/imagecomposition/imagecomposer.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "imagecomposer.h"
+
+#include <QtWidgets>
+
+//! [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, &QAbstractButton::clicked,
+            this, &ImageComposer::chooseSource);
+    connect(operatorComboBox, &QComboBox::activated,
+            this, &ImageComposer::recalculateResult);
+    connect(destinationButton, &QAbstractButton::clicked,
+            this, &ImageComposer::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);
+
+    // Scale the image to given size
+    *image = image->scaled(resultSize, Qt::KeepAspectRatio);
+
+    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]

examples/widgets/painting/imagecomposition/imagecomposer.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef IMAGECOMPOSER_H
+#define IMAGECOMPOSER_H
+
+#include <QPainter>
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QComboBox;
+class QLabel;
+class QToolButton;
+QT_END_NAMESPACE
+
+//! [0]
+class ImageComposer : public QWidget
+{
+    Q_OBJECT
+
+public:
+    ImageComposer();
+
+private slots:
+    void chooseSource();
+    void chooseDestination();
+    void recalculateResult();
+//! [0]
+
+//! [1]
+private:
+    void addOp(QPainter::CompositionMode mode, const QString &name);
+    void chooseImage(const QString &title, QImage *image, QToolButton *button);
+    void loadImage(const QString &fileName, QImage *image, QToolButton *button);
+    QPainter::CompositionMode currentMode() const;
+    QPoint imagePos(const QImage &image) const;
+
+    QToolButton *sourceButton;
+    QToolButton *destinationButton;
+    QComboBox *operatorComboBox;
+    QLabel *equalLabel;
+    QLabel *resultLabel;
+
+    QImage sourceImage;
+    QImage destinationImage;
+    QImage resultImage;
+};
+//! [1]
+
+#endif // IMAGECOMPOSER_H

examples/widgets/painting/imagecomposition/imagecomposition.pro

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+QT += widgets
+requires(qtConfig(combobox))
+
+HEADERS       = imagecomposer.h
+SOURCES       = imagecomposer.cpp \
+                main.cpp
+RESOURCES     = imagecomposition.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/painting/imagecomposition
+INSTALLS += target

examples/widgets/painting/imagecomposition/imagecomposition.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>images/butterfly.png</file>
+    <file>images/checker.png</file>
+</qresource>
+</RCC>

examples/widgets/painting/imagecomposition/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "imagecomposer.h"
+
+#include <QApplication>
+
+//! [0]
+int main(int argc, char *argv[])
+{
+    Q_INIT_RESOURCE(imagecomposition);
+
+    QApplication app(argc, argv);
+    ImageComposer composer;
+    composer.show();
+    return app.exec();
+}
+//! [0]