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
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the WebP plugins in the Qt ImageFormats module.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwebphandler_p.h"
#include "webp/encode.h"
#include <qimage.h>
#include <qdebug.h>
#include <qvariant.h>
static const int riffHeaderSize = 12; // RIFF_HEADER_SIZE from webp/format_constants.h
QWebpHandler::QWebpHandler() :
m_lossless(false),
m_quality(75),
m_scanState(ScanNotScanned)
{
}
bool QWebpHandler::canRead() const
{
if (m_scanState == ScanNotScanned && !canRead(device()))
return false;
if (m_scanState != ScanError) {
setFormat(QByteArrayLiteral("webp"));
return true;
}
return false;
}
bool QWebpHandler::canRead(QIODevice *device)
{
if (!device) {
qWarning("QWebpHandler::canRead() called with no device");
return false;
}
QByteArray header = device->peek(riffHeaderSize);
return header.startsWith("RIFF") && header.endsWith("WEBP");
}
bool QWebpHandler::ensureScanned() const
{
if (m_scanState != ScanNotScanned)
return m_scanState == ScanSuccess;
m_scanState = ScanError;
if (device()->isSequential()) {
qWarning() << "Sequential devices are not supported";
return false;
}
qint64 oldPos = device()->pos();
device()->seek(0);
QWebpHandler *that = const_cast<QWebpHandler *>(this);
QByteArray header = device()->peek(sizeof(WebPBitstreamFeatures));
if (WebPGetFeatures((const uint8_t*)header.constData(), header.size(), &(that->m_features)) == VP8_STATUS_OK)
m_scanState = ScanSuccess;
device()->seek(oldPos);
return m_scanState == ScanSuccess;
}
bool QWebpHandler::read(QImage *image)
{
if (!ensureScanned() || device()->isSequential())
return false;
QByteArray data = device()->readAll();
QImage result(m_features.width, m_features.height, QImage::Format_ARGB32);
uint8_t *output = result.bits();
size_t output_size = result.byteCount();
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (!WebPDecodeBGRAInto(reinterpret_cast<const uint8_t*>(data.constData()), data.size(), output, output_size, result.bytesPerLine()))
#else
if (!WebPDecodeARGBInto(reinterpret_cast<const uint8_t*>(data.constData()), data.size(), output, output_size, result.bytesPerLine()))
#endif
return false;
*image = result;
return true;
}
static int pictureWriter(const quint8 *data, size_t data_size, const WebPPicture *const pic)
{
QIODevice *io = reinterpret_cast<QIODevice*>(pic->custom_ptr);
return data_size ? ((quint64)(io->write((const char*)data, data_size)) == data_size) : 1;
}
bool QWebpHandler::write(const QImage &image)
{
if (image.isNull()) {
qWarning() << "source image is null.";
return false;
}
QImage srcImage = image;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (srcImage.format() != QImage::Format_ARGB32)
srcImage = srcImage.convertToFormat(QImage::Format_ARGB32);
#else /* Q_BIG_ENDIAN */
if (srcImage.format() != QImage::Format_RGBA8888)
srcImage = srcImage.convertToFormat(QImage::Format_RGBA8888);
#endif
WebPPicture picture;
WebPConfig config;
if (!WebPPictureInit(&picture) || !WebPConfigInit(&config)) {
qWarning() << "failed to init webp picture and config";
return false;
}
picture.width = srcImage.width();
picture.height = srcImage.height();
picture.use_argb = 1;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
if (!WebPPictureImportBGRA(&picture, srcImage.bits(), srcImage.bytesPerLine())) {
#else /* Q_BIG_ENDIAN */
if (!WebPPictureImportRGBA(&picture, srcImage.bits(), srcImage.bytesPerLine())) {
#endif
qWarning() << "failed to import image data to webp picture.";
WebPPictureFree(&picture);
return false;
}
config.lossless = m_lossless;
config.quality = m_quality;
picture.writer = pictureWriter;
picture.custom_ptr = device();
if (!WebPEncode(&config, &picture)) {
qWarning() << "failed to encode webp picture, error code: " << picture.error_code;
WebPPictureFree(&picture);
return false;
}
WebPPictureFree(&picture);
return true;
}
QVariant QWebpHandler::option(ImageOption option) const
{
if (!supportsOption(option) || !ensureScanned())
return QVariant();
switch (option) {
case Quality:
return m_quality;
case Size:
return QSize(m_features.width, m_features.height);
default:
return QVariant();
}
}
void QWebpHandler::setOption(ImageOption option, const QVariant &value)
{
switch (option) {
case Quality:
m_quality = qBound(0, value.toInt(), 100);
m_lossless = (m_quality >= 100);
return;
default:
break;
}
return QImageIOHandler::setOption(option, value);
}
bool QWebpHandler::supportsOption(ImageOption option) const
{
return option == Quality || option == Size;
}
QByteArray QWebpHandler::name() const
{
return QByteArrayLiteral("webp");
}
|
