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    41 

    42 #include "videoitem.h"

    43 

    44 #include <QtGui>

    45 #include <qvideosurfaceformat.h>

    46 

    47 VideoItem::VideoItem(QGraphicsItem *parent)

    48     : QGraphicsItem(parent)

    49     , imageFormat(QImage::Format_Invalid)

    50     , framePainted(false)

    51 {

    52 }

    53 

    54 VideoItem::~VideoItem()

    55 {

    56 }

    57 

    58 QRectF VideoItem::boundingRect() const

    59 {

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

    61 }

    62 

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

    64 {

    65     Q_UNUSED(option);

    66     Q_UNUSED(widget);

    67 

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

    69         const QTransform oldTransform = painter->transform();

    70 

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

    72            painter->scale(1, -1);

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

    74         }

    75 

    76         painter->drawImage(boundingRect(), QImage(

    77                 currentFrame.bits(),

    78                 imageSize.width(),

    79                 imageSize.height(),

    80                 imageFormat));

    81 

    82         painter->setTransform(oldTransform);

    83 

    84         framePainted = true;

    85 

    86         currentFrame.unmap();

    87     }

    88 }

    89 

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

    91         QAbstractVideoBuffer::HandleType handleType) const

    92 {

    93     if (handleType == QAbstractVideoBuffer::NoHandle) {

    94         return QList<QVideoFrame::PixelFormat>()

    95                 << QVideoFrame::Format_RGB32

    96                 << QVideoFrame::Format_ARGB32

    97                 << QVideoFrame::Format_ARGB32_Premultiplied

    98                 << QVideoFrame::Format_RGB565

    99                 << QVideoFrame::Format_RGB555;

   100     } else {

   101         return QList<QVideoFrame::PixelFormat>();

   102     }

   103 }

   104 

   105 bool VideoItem::start(const QVideoSurfaceFormat &format)

   106 {

   107     if (isFormatSupported(format)) {

   108         imageFormat = QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat());

   109         imageSize = format.frameSize();

   110         framePainted = true;

   111 

   112         QAbstractVideoSurface::start(format);

   113 

   114         prepareGeometryChange();

   115 

   116         return true;

   117     } else {

   118         return false;

   119     }

   120 }

   121 

   122 void VideoItem::stop()

   123 {

   124     currentFrame = QVideoFrame();

   125     framePainted = false;

   126 

   127     QAbstractVideoSurface::stop();

   128 }

   129 

   130 bool VideoItem::present(const QVideoFrame &frame)

   131 {

   132     if (!framePainted) {

   133         if (!QAbstractVideoSurface::isActive())

   134             setError(StoppedError);

   135 

   136         return false;

   137     } else {

   138         currentFrame = frame;

   139         framePainted = false;

   140 

   141         update();

   142 

   143         return true;

   144     }

   145 }