209 lines
7.4 KiB
C++
209 lines
7.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "imagecomposer.h"
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#include <QtWidgets>
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//! [0]
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static const QSize resultSize(200, 200);
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//! [0]
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//! [1]
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ImageComposer::ImageComposer()
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{
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sourceButton = new QToolButton;
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sourceButton->setIconSize(resultSize);
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operatorComboBox = new QComboBox;
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addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver"));
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addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver"));
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addOp(QPainter::CompositionMode_Clear, tr("Clear"));
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addOp(QPainter::CompositionMode_Source, tr("Source"));
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addOp(QPainter::CompositionMode_Destination, tr("Destination"));
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addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn"));
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addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn"));
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addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut"));
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addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut"));
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addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop"));
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addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop"));
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addOp(QPainter::CompositionMode_Xor, tr("Xor"));
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addOp(QPainter::CompositionMode_Plus, tr("Plus"));
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addOp(QPainter::CompositionMode_Multiply, tr("Multiply"));
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addOp(QPainter::CompositionMode_Screen, tr("Screen"));
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addOp(QPainter::CompositionMode_Overlay, tr("Overlay"));
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addOp(QPainter::CompositionMode_Darken, tr("Darken"));
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addOp(QPainter::CompositionMode_Lighten, tr("Lighten"));
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addOp(QPainter::CompositionMode_ColorDodge, tr("ColorDodge"));
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addOp(QPainter::CompositionMode_ColorBurn, tr("ColorBurn"));
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addOp(QPainter::CompositionMode_HardLight, tr("HardLight"));
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addOp(QPainter::CompositionMode_SoftLight, tr("SoftLight"));
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addOp(QPainter::CompositionMode_Difference, tr("Difference"));
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addOp(QPainter::CompositionMode_Exclusion, tr("Exclusion"));
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//! [1]
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//! [2]
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destinationButton = new QToolButton;
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destinationButton->setIconSize(resultSize);
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equalLabel = new QLabel(tr("="));
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resultLabel = new QLabel;
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resultLabel->setMinimumWidth(resultSize.width());
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//! [2]
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//! [3]
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connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource()));
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connect(operatorComboBox, SIGNAL(activated(int)), this, SLOT(recalculateResult()));
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connect(destinationButton, SIGNAL(clicked()), this, SLOT(chooseDestination()));
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//! [3]
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//! [4]
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QGridLayout *mainLayout = new QGridLayout;
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mainLayout->addWidget(sourceButton, 0, 0, 3, 1);
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mainLayout->addWidget(operatorComboBox, 1, 1);
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mainLayout->addWidget(destinationButton, 0, 2, 3, 1);
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mainLayout->addWidget(equalLabel, 1, 3);
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mainLayout->addWidget(resultLabel, 0, 4, 3, 1);
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mainLayout->setSizeConstraint(QLayout::SetFixedSize);
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setLayout(mainLayout);
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//! [4]
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//! [5]
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resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied);
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loadImage(":/images/butterfly.png", &sourceImage, sourceButton);
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loadImage(":/images/checker.png", &destinationImage, destinationButton);
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setWindowTitle(tr("Image Composition"));
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}
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//! [5]
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//! [6]
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void ImageComposer::chooseSource()
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{
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chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton);
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}
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//! [6]
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//! [7]
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void ImageComposer::chooseDestination()
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{
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chooseImage(tr("Choose Destination Image"), &destinationImage, destinationButton);
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}
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//! [7]
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//! [8]
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void ImageComposer::recalculateResult()
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{
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QPainter::CompositionMode mode = currentMode();
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QPainter painter(&resultImage);
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painter.setCompositionMode(QPainter::CompositionMode_Source);
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painter.fillRect(resultImage.rect(), Qt::transparent);
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painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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painter.drawImage(0, 0, destinationImage);
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painter.setCompositionMode(mode);
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painter.drawImage(0, 0, sourceImage);
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painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
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painter.fillRect(resultImage.rect(), Qt::white);
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painter.end();
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resultLabel->setPixmap(QPixmap::fromImage(resultImage));
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}
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//! [8]
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//! [9]
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void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name)
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{
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operatorComboBox->addItem(name, mode);
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}
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//! [9]
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//! [10]
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void ImageComposer::chooseImage(const QString &title, QImage *image,
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QToolButton *button)
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{
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QString fileName = QFileDialog::getOpenFileName(this, title);
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if (!fileName.isEmpty())
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loadImage(fileName, image, button);
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}
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//! [10]
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//! [11]
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void ImageComposer::loadImage(const QString &fileName, QImage *image,
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QToolButton *button)
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{
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image->load(fileName);
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// Scale the image to given size
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*image = image->scaled(resultSize, Qt::KeepAspectRatio);
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QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied);
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QPainter painter(&fixedImage);
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painter.setCompositionMode(QPainter::CompositionMode_Source);
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painter.fillRect(fixedImage.rect(), Qt::transparent);
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painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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painter.drawImage(imagePos(*image), *image);
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painter.end();
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button->setIcon(QPixmap::fromImage(fixedImage));
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*image = fixedImage;
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recalculateResult();
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}
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//! [11]
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//! [12]
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QPainter::CompositionMode ImageComposer::currentMode() const
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{
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return (QPainter::CompositionMode)
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operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt();
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}
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//! [12]
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//! [13]
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QPoint ImageComposer::imagePos(const QImage &image) const
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{
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return QPoint((resultSize.width() - image.width()) / 2,
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(resultSize.height() - image.height()) / 2);
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}
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//! [13]
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