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50
51#include "videoitem.h"
52
53#include <QPainter>
54#include <QTransform>
55#include <QVideoSurfaceFormat>
56
57VideoItem::VideoItem(QGraphicsItem *parent)
58 : QGraphicsItem(parent)
59 , imageFormat(QImage::Format_Invalid)
60 , framePainted(false)
61{
62}
63
64VideoItem::~VideoItem()
65{
66}
67
68QRectF VideoItem::boundingRect() const
69{
70 return QRectF(QPointF(0,0), surfaceFormat().sizeHint());
71}
72
73void VideoItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
74{
75 Q_UNUSED(option);
76 Q_UNUSED(widget);
77
78 if (currentFrame.map(mode: QAbstractVideoBuffer::ReadOnly)) {
79 const QTransform oldTransform = painter->transform();
80
81 if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) {
82 painter->scale(sx: 1, sy: -1);
83 painter->translate(dx: 0, dy: -boundingRect().height());
84 }
85
86 painter->drawImage(r: boundingRect(), image: QImage(
87 currentFrame.bits(),
88 imageSize.width(),
89 imageSize.height(),
90 imageFormat));
91
92 painter->setTransform(transform: oldTransform);
93
94 framePainted = true;
95
96 currentFrame.unmap();
97 }
98}
99
100QList<QVideoFrame::PixelFormat> VideoItem::supportedPixelFormats(
101 QAbstractVideoBuffer::HandleType handleType) const
102{
103 if (handleType == QAbstractVideoBuffer::NoHandle) {
104 return QList<QVideoFrame::PixelFormat>()
105 << QVideoFrame::Format_RGB32
106 << QVideoFrame::Format_ARGB32
107 << QVideoFrame::Format_ARGB32_Premultiplied
108 << QVideoFrame::Format_RGB565
109 << QVideoFrame::Format_RGB555;
110 } else {
111 return QList<QVideoFrame::PixelFormat>();
112 }
113}
114
115bool VideoItem::start(const QVideoSurfaceFormat &format)
116{
117 if (isFormatSupported(format)) {
118 imageFormat = QVideoFrame::imageFormatFromPixelFormat(format: format.pixelFormat());
119 imageSize = format.frameSize();
120 framePainted = true;
121
122 QAbstractVideoSurface::start(format);
123
124 prepareGeometryChange();
125
126 return true;
127 } else {
128 return false;
129 }
130}
131
132void VideoItem::stop()
133{
134 currentFrame = QVideoFrame();
135 framePainted = false;
136
137 QAbstractVideoSurface::stop();
138}
139
140bool VideoItem::present(const QVideoFrame &frame)
141{
142 if (!framePainted) {
143 if (!QAbstractVideoSurface::isActive())
144 setError(StoppedError);
145
146 return false;
147 } else {
148 currentFrame = frame;
149 framePainted = false;
150
151 update();
152
153 return true;
154 }
155}
156

source code of qtmultimedia/examples/multimediawidgets/customvideosurface/customvideoitem/videoitem.cpp