imagecomposer.cpp Example File

painting/imagecomposition/imagecomposer.cpp
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#include "imagecomposer.h" #include <QtWidgets> static const QSize resultSize(200, 200); 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")); destinationButton = new QToolButton; destinationButton->setIconSize(resultSize); equalLabel = new QLabel(tr("=")); resultLabel = new QLabel; resultLabel->setMinimumWidth(resultSize.width()); connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource())); connect(operatorComboBox, SIGNAL(activated(int)), this, SLOT(recalculateResult())); connect(destinationButton, SIGNAL(clicked()), this, SLOT(chooseDestination())); 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); resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied); loadImage(":/images/butterfly.png", &sourceImage, sourceButton); loadImage(":/images/checker.png", &destinationImage, destinationButton); setWindowTitle(tr("Image Composition")); } void ImageComposer::chooseSource() { chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton); } void ImageComposer::chooseDestination() { chooseImage(tr("Choose Destination Image"), &destinationImage, destinationButton); } 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)); } void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name) { operatorComboBox->addItem(name, mode); } void ImageComposer::chooseImage(const QString &title, QImage *image, QToolButton *button) { QString fileName = QFileDialog::getOpenFileName(this, title); if (!fileName.isEmpty()) loadImage(fileName, image, button); } 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(); } QPainter::CompositionMode ImageComposer::currentMode() const { return (QPainter::CompositionMode) operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt(); } QPoint ImageComposer::imagePos(const QImage &image) const { return QPoint((resultSize.width() - image.width()) / 2, (resultSize.height() - image.height()) / 2); }