source: trunk/examples/multimedia/videowidget/videowidgetsurface.cpp@ 561

Last change on this file since 561 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.

  • Property svn:eol-style set to native
File size: 5.2 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this 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 have questions regarding the use of this file, please contact
37** Nokia at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include "videowidgetsurface.h"
43
44#include <QtMultimedia>
45
46VideoWidgetSurface::VideoWidgetSurface(QWidget *widget, QObject *parent)
47 : QAbstractVideoSurface(parent)
48 , widget(widget)
49 , imageFormat(QImage::Format_Invalid)
50{
51}
52
53//! [0]
54QList<QVideoFrame::PixelFormat> VideoWidgetSurface::supportedPixelFormats(
55 QAbstractVideoBuffer::HandleType handleType) const
56{
57 if (handleType == QAbstractVideoBuffer::NoHandle) {
58 return QList<QVideoFrame::PixelFormat>()
59 << QVideoFrame::Format_RGB32
60 << QVideoFrame::Format_ARGB32
61 << QVideoFrame::Format_ARGB32_Premultiplied
62 << QVideoFrame::Format_RGB565
63 << QVideoFrame::Format_RGB555;
64 } else {
65 return QList<QVideoFrame::PixelFormat>();
66 }
67}
68//! [0]
69
70//! [1]
71bool VideoWidgetSurface::isFormatSupported(
72 const QVideoSurfaceFormat &format, QVideoSurfaceFormat *similar) const
73{
74 Q_UNUSED(similar);
75
76 const QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat());
77 const QSize size = format.frameSize();
78
79 return imageFormat != QImage::Format_Invalid
80 && !size.isEmpty()
81 && format.handleType() == QAbstractVideoBuffer::NoHandle;
82}
83//! [1]
84
85//! [2]
86bool VideoWidgetSurface::start(const QVideoSurfaceFormat &format)
87{
88 const QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat());
89 const QSize size = format.frameSize();
90
91 if (imageFormat != QImage::Format_Invalid && !size.isEmpty()) {
92 this->imageFormat = imageFormat;
93 imageSize = size;
94 sourceRect = format.viewport();
95
96 QAbstractVideoSurface::start(format);
97
98 widget->updateGeometry();
99 updateVideoRect();
100
101 return true;
102 } else {
103 return false;
104 }
105}
106//! [2]
107
108//! [3]
109void VideoWidgetSurface::stop()
110{
111 currentFrame = QVideoFrame();
112 targetRect = QRect();
113
114 QAbstractVideoSurface::stop();
115
116 widget->update();
117}
118//! [3]
119
120//! [4]
121bool VideoWidgetSurface::present(const QVideoFrame &frame)
122{
123 if (surfaceFormat().pixelFormat() != frame.pixelFormat()
124 || surfaceFormat().frameSize() != frame.size()) {
125 setError(IncorrectFormatError);
126 stop();
127
128 return false;
129 } else {
130 currentFrame = frame;
131
132 widget->repaint(targetRect);
133
134 return true;
135 }
136}
137//! [4]
138
139//! [5]
140void VideoWidgetSurface::updateVideoRect()
141{
142 QSize size = surfaceFormat().sizeHint();
143 size.scale(widget->size().boundedTo(size), Qt::KeepAspectRatio);
144
145 targetRect = QRect(QPoint(0, 0), size);
146 targetRect.moveCenter(widget->rect().center());
147}
148//! [5]
149
150//! [6]
151void VideoWidgetSurface::paint(QPainter *painter)
152{
153 if (currentFrame.map(QAbstractVideoBuffer::ReadOnly)) {
154 const QTransform oldTransform = painter->transform();
155
156 if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) {
157 painter->scale(1, -1);
158 painter->translate(0, -widget->height());
159 }
160
161 QImage image(
162 currentFrame.bits(),
163 currentFrame.width(),
164 currentFrame.height(),
165 currentFrame.bytesPerLine(),
166 imageFormat);
167
168 painter->drawImage(targetRect, image, sourceRect);
169
170 painter->setTransform(oldTransform);
171
172 currentFrame.unmap();
173 }
174}
175//! [6]
Note: See TracBrowser for help on using the repository browser.