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
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main()
{
int x, y;
{
// BIT ACCESS
QImage image;
// sets bit at (x, y) to 1
if (image.format() == QImage::Format_MonoLSB)
image.scanLine(y)[x >> 3] |= 1 << (x & 7);
else
image.scanLine(y)[x >> 3] |= 1 << (7 - (x & 7));
}
{
// 8-BIT ACCESS
QImage image;
// set entry 19 in the color table to yellow
image.setColor(19, qRgb(255, 255, 0));
// set 8 bit pixel at (x,y) to value yellow (in color table)
image.scanLine(y)[x] = 19;
}
{
// 32-BIT
QImage image;
// sets 32 bit pixel at (x,y) to yellow.
uint *ptr = reinterpret_cast<uint *>(image.scanLine(y)) + x;
*ptr = qRgb(255, 255, 0);
}
{
// SAVE
//! [0]
QImage image;
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
image.save(&buffer, "PNG"); // writes image into ba in PNG format
//! [0]
}
{
// PIX SAVE
//! [1]
QPixmap pixmap;
QByteArray bytes;
QBuffer buffer(&bytes);
buffer.open(QIODevice::WriteOnly);
pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format
//! [1]
}
{
// MASK
//! [2]
QPixmap alpha("image-with-alpha.png");
QPixmap alphacopy = alpha;
alphacopy.setMask(alphacopy.mask());
//! [2]
}
}
|
