1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the Graphics Dojo project on Qt Labs.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 or 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include <cmath>
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
void applyUnderwater(const QImage* img, QImage* result1, QImage *result2, int amp, qreal tick)
{
Q_ASSERT(img);
Q_ASSERT(result1);
Q_ASSERT(result2);
Q_ASSERT(img->size() == result1->size());
Q_ASSERT(img->size() == result2->size());
Q_ASSERT(img->format() == QImage::Format_ARGB32);
int height = img->height();
int width = img->width();
int stride = img->bytesPerLine();
// shift horizontally
for (int y = 0; y < height; ++y) {
const uchar* src = img->scanLine(y);
uchar* dst = result1->scanLine(y);
int shift = amp / 2 * (1 + sin((4 * y / qreal(height) + tick) * 2 * M_PI));
int offset = 4 * shift;
memcpy(dst + offset, src, img->bytesPerLine() - offset);
}
// shift vertically
for (int x = 0; x < width; ++x) {
int shift = amp / 2 * (1 + sin((4 * x / qreal(width) + tick) * 2 * M_PI));
const uchar* src = result1->scanLine(0) + x * 4;
uchar* dst = result2->scanLine(shift) + x * 4;
for (int c = 0; c < height - shift; ++c, dst += stride, src += stride) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = src[3];
}
}
}
class UnderwaterDemo: public QWidget
{
public:
UnderwaterDemo();
void loadImage(const QString& file);
void loadImage(const QImage& image);
void dragEnterEvent(QDragEnterEvent*);
void dropEvent(QDropEvent* event);
void paintEvent(QPaintEvent*);
private:
QString m_fileName;
QImage m_image;
QImage m_modifiedImage1;
QImage m_modifiedImage2;
QTimeLine* m_timeLine;
QGroupBox* m_enableEffect;
QSlider* m_amplitudeSlider;
QSlider* m_speedSlider;
};
UnderwaterDemo::UnderwaterDemo()
{
setAcceptDrops(true);
setAttribute(Qt::WA_StaticContents, true);
setAttribute(Qt::WA_OpaquePaintEvent, true);
setAttribute(Qt::WA_NoSystemBackground, true);
m_timeLine = new QTimeLine(1000, this);
m_timeLine->setFrameRange(0, 4096);
m_timeLine->setCurveShape(QTimeLine::LinearCurve);
m_timeLine->setLoopCount(0);
connect(m_timeLine, SIGNAL(frameChanged(int)), this, SLOT(update()));
QWidget* toolWidget = new QWidget(this);
toolWidget->setWindowTitle("Parameters");
toolWidget->setWindowFlags(Qt::Tool | Qt::WindowTitleHint);
toolWidget->show();
QVBoxLayout* toolLayout = new QVBoxLayout;
toolWidget->setLayout(toolLayout);
toolLayout->setSizeConstraint(QLayout::SetFixedSize);
m_enableEffect = new QGroupBox(toolWidget);
m_enableEffect->setCheckable(true);
m_enableEffect->setTitle("Enable");
m_enableEffect->setFlat(true);
connect(m_enableEffect, SIGNAL(toggled(bool)), SLOT(update()));
toolLayout->addWidget(m_enableEffect);
m_amplitudeSlider = new QSlider(toolWidget);
m_amplitudeSlider->setRange(5, 16);
m_amplitudeSlider->setOrientation(Qt::Horizontal);
connect(m_amplitudeSlider, SIGNAL(sliderMoved(int)), SLOT(update()));
m_speedSlider = new QSlider(toolWidget);
m_speedSlider->setRange(1000, 4000);
m_speedSlider->setOrientation(Qt::Horizontal);
connect(m_speedSlider, SIGNAL(sliderMoved(int)), SLOT(update()));
QGridLayout* layout = new QGridLayout;
m_enableEffect->setLayout(layout);
layout->addWidget(new QLabel("Amplitude"), 0, 0);
layout->addWidget(m_amplitudeSlider, 0, 1);
layout->addWidget(new QLabel("Speed"), 1, 0);
layout->addWidget(m_speedSlider, 1, 1);
toolWidget->adjustSize();
m_enableEffect->setChecked(true);
m_amplitudeSlider->setValue(6);
m_speedSlider->setValue(1000);
}
void UnderwaterDemo::loadImage(const QImage& image)
{
m_image = image;
if (m_image.isNull()) {
setFixedSize(512, 256);
setWindowTitle(QString("Can not load %1").arg(m_fileName));
} else {
QString title = "Underwater Effect ";
if ((m_image.width() > 640) || (m_image.height() > 480)) {
qDebug() << "Image is too large. Rescaling....";
int w = m_image.width();
m_image = m_image.scaled(640, 480, Qt::KeepAspectRatio, Qt::SmoothTransformation);
title += QString("[Zoom %1%] ").arg(m_image.width() * 100 / w);
}
setWindowTitle(QString("%1: %2 (%3 x %4)").arg(title).arg(m_fileName).
arg(m_image.width()).arg(m_image.height()));
setFixedSize(m_image.width(), m_image.height());
m_image = m_image.convertToFormat(QImage::Format_ARGB32);
}
m_modifiedImage1 = m_image;
m_modifiedImage2 = m_image;
update();
}
void UnderwaterDemo::loadImage(const QString& fileName)
{
m_fileName = QFileInfo(fileName).fileName();
loadImage(QImage(fileName));
}
void UnderwaterDemo::dragEnterEvent(QDragEnterEvent* event)
{
if (event->mimeData()->hasFormat("text/uri-list"))
event->acceptProposedAction();
}
void UnderwaterDemo::dropEvent(QDropEvent* event)
{
QList<QUrl> urls = event->mimeData()->urls();
if (urls.count()) {
QString fname = urls[0].toLocalFile();
if (event->mimeData()->hasImage()) {
QImage img = qvariant_cast<QImage>(event->mimeData()->imageData());
m_fileName = QFileInfo(fname).fileName();
loadImage(img);
} else
loadImage(fname);
event->acceptProposedAction();
}
}
void UnderwaterDemo::paintEvent(QPaintEvent*)
{
QPainter painter(this);
if (!m_enableEffect->isChecked()) {
m_timeLine->setPaused(true);
painter.drawImage(0, 0, m_image);
} else {
if (m_timeLine->state() != QTimeLine::Running)
m_timeLine->start();
int speed = m_speedSlider->value();
int duration = m_speedSlider->maximum() - speed + m_speedSlider->minimum();
m_timeLine->setDuration(duration);
int amp = m_amplitudeSlider->value();
qreal tick = m_timeLine->currentValue();
if (!m_image.isNull())
if (!m_modifiedImage1.isNull())
if (!m_modifiedImage2.isNull())
applyUnderwater(&m_image, &m_modifiedImage1, &m_modifiedImage2, amp, tick);
painter.drawImage(0, 0, m_modifiedImage2);
}
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
UnderwaterDemo widget;
widget.show();
if (argc > 1)
widget.loadImage(argv[1]);
else
widget.loadImage("bridge.jpg");
return app.exec();
}
|
