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#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;

        currentFrame.unmap();

    }

}

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

        QAbstractVideoBuffer::HandleType handleType) const

{

    if (handleType == QAbstractVideoBuffer::NoHandle) {

        return QList<QVideoFrame::PixelFormat>()

                << QVideoFrame::Format_RGB32

                << QVideoFrame::Format_ARGB32

                << QVideoFrame::Format_ARGB32_Premultiplied

                << QVideoFrame::Format_RGB565

                << QVideoFrame::Format_RGB555;

    } else {

        return QList<QVideoFrame::PixelFormat>();

    }

}

bool VideoItem::start(const QVideoSurfaceFormat &format)

{

    if (isFormatSupported(format)) {

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

        imageSize = format.frameSize();

        framePainted = true;

        QAbstractVideoSurface::start(format);

        prepareGeometryChange();

        return true;

    } else {

        return false;

    }

}

void VideoItem::stop()

{

    currentFrame = QVideoFrame();

    framePainted = false;

    QAbstractVideoSurface::stop();

}

bool VideoItem::present(const QVideoFrame &frame)

{

    if (!framePainted) {

        if (!QAbstractVideoSurface::isActive())

            setError(StoppedError);

        return false;

    } else {

        currentFrame = frame;

        framePainted = false;

        update();

        return true;

    }

}