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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #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, QOverload<int>::of(&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] |