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50
51#include "imagecomposer.h"
52
53#include <QtWidgets>
54
55//! [0]
56static const QSize resultSize(200, 200);
57//! [0]
58
59//! [1]
60ImageComposer::ImageComposer()
61{
62 sourceButton = new QToolButton;
63 sourceButton->setIconSize(resultSize);
64
65 operatorComboBox = new QComboBox;
66 addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver"));
67 addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver"));
68 addOp(QPainter::CompositionMode_Clear, tr("Clear"));
69 addOp(QPainter::CompositionMode_Source, tr("Source"));
70 addOp(QPainter::CompositionMode_Destination, tr("Destination"));
71 addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn"));
72 addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn"));
73 addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut"));
74 addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut"));
75 addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop"));
76 addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop"));
77 addOp(QPainter::CompositionMode_Xor, tr("Xor"));
78 addOp(QPainter::CompositionMode_Plus, tr("Plus"));
79 addOp(QPainter::CompositionMode_Multiply, tr("Multiply"));
80 addOp(QPainter::CompositionMode_Screen, tr("Screen"));
81 addOp(QPainter::CompositionMode_Overlay, tr("Overlay"));
82 addOp(QPainter::CompositionMode_Darken, tr("Darken"));
83 addOp(QPainter::CompositionMode_Lighten, tr("Lighten"));
84 addOp(QPainter::CompositionMode_ColorDodge, tr("ColorDodge"));
85 addOp(QPainter::CompositionMode_ColorBurn, tr("ColorBurn"));
86 addOp(QPainter::CompositionMode_HardLight, tr("HardLight"));
87 addOp(QPainter::CompositionMode_SoftLight, tr("SoftLight"));
88 addOp(QPainter::CompositionMode_Difference, tr("Difference"));
89 addOp(QPainter::CompositionMode_Exclusion, tr("Exclusion"));
90//! [1]
91
92//! [2]
93 destinationButton = new QToolButton;
94 destinationButton->setIconSize(resultSize);
95
96 equalLabel = new QLabel(tr("="));
97
98 resultLabel = new QLabel;
99 resultLabel->setMinimumWidth(resultSize.width());
100//! [2]
101
102//! [3]
103 connect(sourceButton, &QAbstractButton::clicked,
104 this, &ImageComposer::chooseSource);
105 connect(operatorComboBox, &QComboBox::activated,
106 this, &ImageComposer::recalculateResult);
107 connect(destinationButton, &QAbstractButton::clicked,
108 this, &ImageComposer::chooseDestination);
109//! [3]
110
111//! [4]
112 QGridLayout *mainLayout = new QGridLayout;
113 mainLayout->addWidget(sourceButton, 0, 0, 3, 1);
114 mainLayout->addWidget(operatorComboBox, 1, 1);
115 mainLayout->addWidget(destinationButton, 0, 2, 3, 1);
116 mainLayout->addWidget(equalLabel, 1, 3);
117 mainLayout->addWidget(resultLabel, 0, 4, 3, 1);
118 mainLayout->setSizeConstraint(QLayout::SetFixedSize);
119 setLayout(mainLayout);
120//! [4]
121
122//! [5]
123 resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied);
124
125 loadImage(":/images/butterfly.png", &sourceImage, sourceButton);
126 loadImage(":/images/checker.png", &destinationImage, destinationButton);
127
128 setWindowTitle(tr("Image Composition"));
129}
130//! [5]
131
132//! [6]
133void ImageComposer::chooseSource()
134{
135 chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton);
136}
137//! [6]
138
139//! [7]
140void ImageComposer::chooseDestination()
141{
142 chooseImage(tr("Choose Destination Image"), &destinationImage, destinationButton);
143}
144//! [7]
145
146//! [8]
147void ImageComposer::recalculateResult()
148{
149 QPainter::CompositionMode mode = currentMode();
150
151 QPainter painter(&resultImage);
152 painter.setCompositionMode(QPainter::CompositionMode_Source);
153 painter.fillRect(resultImage.rect(), Qt::transparent);
154 painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
155 painter.drawImage(0, 0, destinationImage);
156 painter.setCompositionMode(mode);
157 painter.drawImage(0, 0, sourceImage);
158 painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
159 painter.fillRect(resultImage.rect(), Qt::white);
160 painter.end();
161
162 resultLabel->setPixmap(QPixmap::fromImage(resultImage));
163}
164//! [8]
165
166//! [9]
167void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name)
168{
169 operatorComboBox->addItem(name, mode);
170}
171//! [9]
172
173//! [10]
174void ImageComposer::chooseImage(const QString &title, QImage *image,
175 QToolButton *button)
176{
177 QString fileName = QFileDialog::getOpenFileName(this, title);
178 if (!fileName.isEmpty())
179 loadImage(fileName, image, button);
180}
181//! [10]
182
183//! [11]
184void ImageComposer::loadImage(const QString &fileName, QImage *image,
185 QToolButton *button)
186{
187 image->load(fileName);
188
189 // Scale the image to given size
190 *image = image->scaled(resultSize, Qt::KeepAspectRatio);
191
192 QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied);
193 QPainter painter(&fixedImage);
194 painter.setCompositionMode(QPainter::CompositionMode_Source);
195 painter.fillRect(fixedImage.rect(), Qt::transparent);
196 painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
197 painter.drawImage(imagePos(*image), *image);
198 painter.end();
199 button->setIcon(QPixmap::fromImage(fixedImage));
200
201 *image = fixedImage;
202
203 recalculateResult();
204}
205//! [11]
206
207//! [12]
208QPainter::CompositionMode ImageComposer::currentMode() const
209{
210 return (QPainter::CompositionMode)
211 operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt();
212}
213//! [12]
214
215//! [13]
216QPoint ImageComposer::imagePos(const QImage &image) const
217{
218 return QPoint((resultSize.width() - image.width()) / 2,
219 (resultSize.height() - image.height()) / 2);
220}
221//! [13]
222