~oif-team/ubuntu/natty/qt4-x11/xi2.1

<td width="1">  </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td><td class="searchBar" align="right" valign="center"><form action="http://www.google.com/cse" id="cse-search-box"><div><input type="hidden" name="cx" value="000136343326384750312:dhbxnqlakyu" /><input type="hidden" name="ie" value="UTF-8" /><input type="text" name="q" size="31" /><input type="submit" name="sa" value="Search" /></div></form></td>

</tr></table><h1 class="title">videoitem.cpp Example File<br /><span class="small-subtitle">video/videographicsitem/videoitem.cpp</span>

</h1>

<pre><span class="comment"> /****************************************************************************

** Contact: Nokia Corporation (qt-info@nokia.com)

** This file is part of the examples 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.

** $QT_END_LICENSE$

****************************************************************************/</span>

#include "videoitem.h"

#include <QtMultimedia>

VideoItem::VideoItem(QGraphicsItem *parent)

: QGraphicsItem(parent)

, imageFormat(QImage::Format_Invalid)

, framePainted(false)

{

}

VideoItem::~VideoItem()

{

}

QRectF VideoItem::boundingRect() const

{

return QRectF(QPointF(0,0), surfaceFormat().sizeHint());

}

void VideoItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

{

Q_UNUSED(option);

Q_UNUSED(widget);

if (currentFrame.map(QAbstractVideoBuffer::ReadOnly)) {

const QTransform oldTransform = painter->transform();

if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) {

painter->scale(1, -1);

painter->translate(0, -boundingRect().height());

}

painter->drawImage(boundingRect(), QImage(

currentFrame.bits(),

imageSize.width(),

imageSize.height(),

imageFormat));

painter->setTransform(oldTransform);

framePainted = true;

100

currentFrame.unmap();

101

}

102

}

103

104

QList<QVideoFrame::PixelFormat> VideoItem::supportedPixelFormats(

105

QAbstractVideoBuffer::HandleType handleType) const

106

{

107

if (handleType == QAbstractVideoBuffer::NoHandle) {

108

return QList<QVideoFrame::PixelFormat>()

109

<< QVideoFrame::Format_RGB32

110

<< QVideoFrame::Format_ARGB32

111

<< QVideoFrame::Format_ARGB32_Premultiplied

112

<< QVideoFrame::Format_RGB565

113

<< QVideoFrame::Format_RGB555;

114

} else {

115

return QList<QVideoFrame::PixelFormat>();

116

}

117

}

118

119

bool VideoItem::start(const QVideoSurfaceFormat &format)

120

{

121

if (isFormatSupported(format)) {

122

imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat());

123

imageSize = format.frameSize();

124

framePainted = true;

125

126

QAbstractVideoSurface::start(format);

127

128

prepareGeometryChange();

129

130

return true;

131

} else {

132

return false;

133

}

134

}

135

136

void VideoItem::stop()

137

{

138

currentFrame = QVideoFrame();

139

framePainted = false;

140

141

QAbstractVideoSurface::stop();

142

}

143

144

bool VideoItem::present(const QVideoFrame &frame)

145

{

146

if (!framePainted) {

147

if (!isStarted())

148

setError(StoppedError);

149

150

return false;

151

} else {

152

currentFrame = frame;

153

framePainted = false;

154

155

update();

156

157

return true;

158

}

159

}</pre>

160

161

162

163

<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>

164

165

166

</html>

Older »