1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the TGA plugin in the Qt ImageFormats module.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
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15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qtgahandler.h"
41#include "qtgafile.h"
42
43#include <QtCore/QVariant>
44#include <QtCore/QDebug>
45#include <QtGui/QImage>
46
47QT_BEGIN_NAMESPACE
48
49QTgaHandler::QTgaHandler()
50 : QImageIOHandler()
51 , tga(0)
52{
53}
54
55QTgaHandler::~QTgaHandler()
56{
57 delete tga;
58}
59
60bool QTgaHandler::canRead() const
61{
62 if (!tga)
63 tga = new QTgaFile(device());
64 if (tga->isValid())
65 {
66 setFormat("tga");
67 return true;
68 }
69 qWarning(msg: "QTgaHandler::canRead(): %s", qPrintable(tga->errorMessage()));
70 return false;
71}
72
73bool QTgaHandler::canRead(QIODevice *device)
74{
75 if (!device) {
76 qWarning(msg: "QTgaHandler::canRead() called with no device");
77 return false;
78 }
79
80 // TGA reader implementation needs a seekable QIODevice, so
81 // sequential devices are not supported
82 if (device->isSequential())
83 return false;
84 qint64 pos = device->pos();
85 bool isValid;
86 {
87 QTgaFile tga(device);
88 isValid = tga.isValid();
89 }
90 device->seek(pos);
91 return isValid;
92}
93
94bool QTgaHandler::read(QImage *image)
95{
96 if (!canRead())
97 return false;
98 *image = tga->readImage();
99 return !image->isNull();
100}
101
102QVariant QTgaHandler::option(ImageOption option) const
103{
104 if (option == Size && canRead()) {
105 return tga->size();
106 } else if (option == CompressionRatio) {
107 return tga->compression();
108 } else if (option == ImageFormat) {
109 return QImage::Format_ARGB32;
110 }
111 return QVariant();
112}
113
114void QTgaHandler::setOption(ImageOption option, const QVariant &value)
115{
116 Q_UNUSED(option);
117 Q_UNUSED(value);
118}
119
120bool QTgaHandler::supportsOption(ImageOption option) const
121{
122 return option == CompressionRatio
123 || option == Size
124 || option == ImageFormat;
125}
126
127QT_END_NAMESPACE
128

source code of qtimageformats/src/plugins/imageformats/tga/qtgahandler.cpp