source: trunk/examples/painting/imagecomposition/imagecomposer.cpp@ 157

Last change on this file since 157 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 7.3 KB
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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you are unsure which license is appropriate for your use, please
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38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <QtGui>
43
44#include "imagecomposer.h"
45
46//! [0]
47static const QSize resultSize(200, 200);
48//! [0]
49
50//! [1]
51ImageComposer::ImageComposer()
52{
53 sourceButton = new QToolButton;
54 sourceButton->setIconSize(resultSize);
55
56 operatorComboBox = new QComboBox;
57 addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver"));
58 addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver"));
59 addOp(QPainter::CompositionMode_Clear, tr("Clear"));
60 addOp(QPainter::CompositionMode_Source, tr("Source"));
61 addOp(QPainter::CompositionMode_Destination, tr("Destination"));
62 addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn"));
63 addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn"));
64 addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut"));
65 addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut"));
66 addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop"));
67 addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop"));
68 addOp(QPainter::CompositionMode_Xor, tr("Xor"));
69 addOp(QPainter::CompositionMode_Plus, tr("Plus"));
70 addOp(QPainter::CompositionMode_Multiply, tr("Multiply"));
71 addOp(QPainter::CompositionMode_Screen, tr("Screen"));
72 addOp(QPainter::CompositionMode_Overlay, tr("Overlay"));
73 addOp(QPainter::CompositionMode_Darken, tr("Darken"));
74 addOp(QPainter::CompositionMode_Lighten, tr("Lighten"));
75 addOp(QPainter::CompositionMode_ColorDodge, tr("ColorDodge"));
76 addOp(QPainter::CompositionMode_ColorBurn, tr("ColorBurn"));
77 addOp(QPainter::CompositionMode_HardLight, tr("HardLight"));
78 addOp(QPainter::CompositionMode_SoftLight, tr("SoftLight"));
79 addOp(QPainter::CompositionMode_Difference, tr("Difference"));
80 addOp(QPainter::CompositionMode_Exclusion, tr("Exclusion"));
81//! [1]
82
83//! [2]
84 destinationButton = new QToolButton;
85 destinationButton->setIconSize(resultSize);
86
87 equalLabel = new QLabel(tr("="));
88
89 resultLabel = new QLabel;
90 resultLabel->setMinimumWidth(resultSize.width());
91//! [2]
92
93//! [3]
94 connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource()));
95 connect(operatorComboBox, SIGNAL(activated(int)),
96 this, SLOT(recalculateResult()));
97 connect(destinationButton, SIGNAL(clicked()),
98 this, SLOT(chooseDestination()));
99//! [3]
100
101//! [4]
102 QGridLayout *mainLayout = new QGridLayout;
103 mainLayout->addWidget(sourceButton, 0, 0, 3, 1);
104 mainLayout->addWidget(operatorComboBox, 1, 1);
105 mainLayout->addWidget(destinationButton, 0, 2, 3, 1);
106 mainLayout->addWidget(equalLabel, 1, 3);
107 mainLayout->addWidget(resultLabel, 0, 4, 3, 1);
108 mainLayout->setSizeConstraint(QLayout::SetFixedSize);
109 setLayout(mainLayout);
110//! [4]
111
112//! [5]
113 resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied);
114
115 loadImage(":/images/butterfly.png", &sourceImage, sourceButton);
116 loadImage(":/images/checker.png", &destinationImage, destinationButton);
117
118 setWindowTitle(tr("Image Composition"));
119}
120//! [5]
121
122//! [6]
123void ImageComposer::chooseSource()
124{
125 chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton);
126}
127//! [6]
128
129//! [7]
130void ImageComposer::chooseDestination()
131{
132 chooseImage(tr("Choose Destination Image"), &destinationImage,
133 destinationButton);
134}
135//! [7]
136
137//! [8]
138void ImageComposer::recalculateResult()
139{
140 QPainter::CompositionMode mode = currentMode();
141
142 QPainter painter(&resultImage);
143 painter.setCompositionMode(QPainter::CompositionMode_Source);
144 painter.fillRect(resultImage.rect(), Qt::transparent);
145 painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
146 painter.drawImage(0, 0, destinationImage);
147 painter.setCompositionMode(mode);
148 painter.drawImage(0, 0, sourceImage);
149 painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
150 painter.fillRect(resultImage.rect(), Qt::white);
151 painter.end();
152
153 resultLabel->setPixmap(QPixmap::fromImage(resultImage));
154}
155//! [8]
156
157//! [9]
158void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name)
159{
160 operatorComboBox->addItem(name, mode);
161}
162//! [9]
163
164//! [10]
165void ImageComposer::chooseImage(const QString &title, QImage *image,
166 QToolButton *button)
167{
168 QString fileName = QFileDialog::getOpenFileName(this, title);
169 if (!fileName.isEmpty())
170 loadImage(fileName, image, button);
171}
172//! [10]
173
174//! [11]
175void ImageComposer::loadImage(const QString &fileName, QImage *image,
176 QToolButton *button)
177{
178 image->load(fileName);
179
180 QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied);
181 QPainter painter(&fixedImage);
182 painter.setCompositionMode(QPainter::CompositionMode_Source);
183 painter.fillRect(fixedImage.rect(), Qt::transparent);
184 painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
185 painter.drawImage(imagePos(*image), *image);
186 painter.end();
187 button->setIcon(QPixmap::fromImage(fixedImage));
188
189 *image = fixedImage;
190
191 recalculateResult();
192}
193//! [11]
194
195//! [12]
196QPainter::CompositionMode ImageComposer::currentMode() const
197{
198 return (QPainter::CompositionMode)
199 operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt();
200}
201//! [12]
202
203//! [13]
204QPoint ImageComposer::imagePos(const QImage &image) const
205{
206 return QPoint((resultSize.width() - image.width()) / 2,
207 (resultSize.height() - image.height()) / 2);
208}
209//! [13]
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