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#include "qgraphicsvideoitem.h"

#include <qmediaobject.h>

#include <qmediaservice.h>

#include <qpaintervideosurface_p.h>

#include <qvideorenderercontrol.h>

#include <QtCore/qcoreevent.h>

#include <QtCore/qpointer.h>

#include <qvideosurfaceformat.h>

#if !defined(QT_NO_OPENGL) && !defined(QT_OPENGL_ES_1_CL) && !defined(QT_OPENGL_ES_1)

#include <QtOpenGL/qgl.h>

#endif

QT_BEGIN_NAMESPACE

class QGraphicsVideoItemPrivate

{

public:

    QGraphicsVideoItemPrivate()

        : q_ptr(0)

        , surface(0)

        , mediaObject(0)

        , service(0)

        , rendererControl(0)

        , aspectRatioMode(Qt::KeepAspectRatio)

        , updatePaintDevice(true)

        , rect(0.0, 0.0, 320, 240)

    {

    }

    QGraphicsVideoItem *q_ptr;

    QPainterVideoSurface *surface;

    QPointer<QMediaObject> mediaObject;

    QMediaService *service;

    QVideoRendererControl *rendererControl;

    Qt::AspectRatioMode aspectRatioMode;

    bool updatePaintDevice;

    QRectF rect;

    QRectF boundingRect;

    QRectF sourceRect;

    QSizeF nativeSize;

    void clearService();

    void updateRects();

    void _q_present();

    void _q_formatChanged(const QVideoSurfaceFormat &format);

    void _q_serviceDestroyed();

};

void QGraphicsVideoItemPrivate::clearService()

{

    if (rendererControl) {

        surface->stop();

        rendererControl->setSurface(0);

        service->releaseControl(rendererControl);

        rendererControl = 0;

    }

    if (service) {

        QObject::disconnect(service, SIGNAL(destroyed()), q_ptr, SLOT(_q_serviceDestroyed()));

        service = 0;

    }

}

void QGraphicsVideoItemPrivate::updateRects()

{

    q_ptr->prepareGeometryChange();

    if (nativeSize.isEmpty()) {

        boundingRect = QRectF();

    } else if (aspectRatioMode == Qt::IgnoreAspectRatio) {

        boundingRect = rect;

        sourceRect = QRectF(0, 0, 1, 1);

    } else if (aspectRatioMode == Qt::KeepAspectRatio) {

        QSizeF size = nativeSize;

        size.scale(rect.size(), Qt::KeepAspectRatio);

        boundingRect = QRectF(0, 0, size.width(), size.height());

        boundingRect.moveCenter(rect.center());

        sourceRect = QRectF(0, 0, 1, 1);

    } else if (aspectRatioMode == Qt::KeepAspectRatioByExpanding) {

        boundingRect = rect;

        QSizeF size = rect.size();

        size.scale(nativeSize, Qt::KeepAspectRatio);

        sourceRect = QRectF(

                0, 0, size.width() / nativeSize.width(), size.height() / nativeSize.height());

        sourceRect.moveCenter(QPointF(0.5, 0.5));

    }

}

void QGraphicsVideoItemPrivate::_q_present()

{

    if (q_ptr->isObscured()) {

        q_ptr->update(boundingRect);

        surface->setReady(true);

    } else {

        q_ptr->update(boundingRect);

    }

}

void QGraphicsVideoItemPrivate::_q_formatChanged(const QVideoSurfaceFormat &format)

{

    nativeSize = format.sizeHint();

    updateRects();

    emit q_ptr->nativeSizeChanged(nativeSize);

}

void QGraphicsVideoItemPrivate::_q_serviceDestroyed()

{

    rendererControl = 0;

    service = 0;

    surface->stop();

}

/*!

    \class QGraphicsVideoItem

    \brief The QGraphicsVideoItem class provides a graphics item which display video produced by a QMediaObject.

    \ingroup multimedia

    Attaching a QGraphicsVideoItem to a QMediaObject allows it to display

    the video or image output of that media object.  A QGraphicsVideoItem

    is attached to a media object by passing a pointer to the QMediaObject

    to the setMediaObject() function.

    \code

    player = new QMediaPlayer(this);

    QGraphicsVideoItem *item = new QGraphicsVideoItem;

    player->setVideoOutput(item);

    graphicsView->scene()->addItem(item);

    graphicsView->show();

    player->setMedia(video);

    player->play();

    \endcode

    \bold {Note}: Only a single display output can be attached to a media

    object at one time.

    \sa QMediaObject, QMediaPlayer, QVideoWidget

*/

/*!

    Constructs a graphics item that displays video.

    The \a parent is passed to QGraphicsItem.

*/

QGraphicsVideoItem::QGraphicsVideoItem(QGraphicsItem *parent)

    : QGraphicsObject(parent)

    , d_ptr(new QGraphicsVideoItemPrivate)

{

    d_ptr->q_ptr = this;

    d_ptr->surface = new QPainterVideoSurface;

    connect(d_ptr->surface, SIGNAL(frameChanged()), this, SLOT(_q_present()));

    connect(d_ptr->surface, SIGNAL(surfaceFormatChanged(QVideoSurfaceFormat)),

            this, SLOT(_q_formatChanged(QVideoSurfaceFormat)));

}

/*!

    Destroys a video graphics item.

*/

QGraphicsVideoItem::~QGraphicsVideoItem()

{

    if (d_ptr->rendererControl) {

        d_ptr->rendererControl->setSurface(0);

        d_ptr->service->releaseControl(d_ptr->rendererControl);

    }

    delete d_ptr->surface;

    delete d_ptr;

}

/*!

    \property QGraphicsVideoItem::mediaObject

    \brief the media object which provides the video displayed by a graphics

    item.

*/

QMediaObject *QGraphicsVideoItem::mediaObject() const

{

    return d_func()->mediaObject;

}

/*!

  \internal

*/

bool QGraphicsVideoItem::setMediaObject(QMediaObject *object)

{

    Q_D(QGraphicsVideoItem);

    if (object == d->mediaObject)

        return true;

    d->clearService();

    d->mediaObject = object;

    if (d->mediaObject) {

        d->service = d->mediaObject->service();

        if (d->service) {

            QMediaControl *control = d->service->requestControl(QVideoRendererControl_iid);

            if (control) {

                d->rendererControl = qobject_cast<QVideoRendererControl *>(control);

                if (d->rendererControl) {

                    d->rendererControl->setSurface(d->surface);

                    connect(d->service, SIGNAL(destroyed()), this, SLOT(_q_serviceDestroyed()));

                    return true;

                }

                if (control)

                    d->service->releaseControl(control);

            }

        }

    }

    d->mediaObject = 0;

    return false;

}

/*!

    \property QGraphicsVideoItem::aspectRatioMode

    \brief how a video is scaled to fit the graphics item's size.

*/

Qt::AspectRatioMode QGraphicsVideoItem::aspectRatioMode() const

{

    return d_func()->aspectRatioMode;

}

void QGraphicsVideoItem::setAspectRatioMode(Qt::AspectRatioMode mode)

{

    Q_D(QGraphicsVideoItem);

    d->aspectRatioMode = mode;

    d->updateRects();

}

/*!

    \property QGraphicsVideoItem::offset

    \brief the video item's offset.

    QGraphicsVideoItem will draw video using the offset for its top left

    corner.

*/

QPointF QGraphicsVideoItem::offset() const

{

    return d_func()->rect.topLeft();

}

void QGraphicsVideoItem::setOffset(const QPointF &offset)

{

    Q_D(QGraphicsVideoItem);

    d->rect.moveTo(offset);

    d->updateRects();

}

/*!

    \property QGraphicsVideoItem::size

    \brief the video item's size.

    QGraphicsVideoItem will draw video scaled to fit size according to its

    fillMode.

*/

QSizeF QGraphicsVideoItem::size() const

{

    return d_func()->rect.size();

}

void QGraphicsVideoItem::setSize(const QSizeF &size)

{

    Q_D(QGraphicsVideoItem);

    d->rect.setSize(size.isValid() ? size : QSizeF(0, 0));

    d->updateRects();

}

/*!

    \property QGraphicsVideoItem::nativeSize

    \brief the native size of the video.

*/

QSizeF QGraphicsVideoItem::nativeSize() const

{

    return d_func()->nativeSize;

}

/*!

    \fn QGraphicsVideoItem::nativeSizeChanged(const QSizeF &size)

    Signals that the native \a size of the video has changed.

*/

/*!

    \reimp

*/

QRectF QGraphicsVideoItem::boundingRect() const

{

    return d_func()->boundingRect;

}

/*!

    \reimp

*/

void QGraphicsVideoItem::paint(

        QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

{

    Q_D(QGraphicsVideoItem);

    Q_UNUSED(option);

    Q_UNUSED(widget);

    if (d->surface && d->surface->isActive()) {

        d->surface->paint(painter, d->boundingRect, d->sourceRect);

        d->surface->setReady(true);

#if !defined(QT_NO_OPENGL) && !defined(QT_OPENGL_ES_1_CL) && !defined(QT_OPENGL_ES_1)

    } else if (d->updatePaintDevice && (painter->paintEngine()->type() == QPaintEngine::OpenGL

            || painter->paintEngine()->type() == QPaintEngine::OpenGL2)) {

        d->updatePaintDevice = false;

        if (widget)

            connect(widget, SIGNAL(destroyed()), d->surface, SLOT(viewportDestroyed()));

        d->surface->setGLContext(const_cast<QGLContext *>(QGLContext::currentContext()));

        if (d->surface->supportedShaderTypes() & QPainterVideoSurface::GlslShader) {

            d->surface->setShaderType(QPainterVideoSurface::GlslShader);

        } else {

            d->surface->setShaderType(QPainterVideoSurface::FragmentProgramShader);

        }

#endif

    }

}

/*!

    \reimp

    \internal

*/

QVariant QGraphicsVideoItem::itemChange(GraphicsItemChange change, const QVariant &value)

{

    return QGraphicsItem::itemChange(change, value);

}

/*!

  \internal

*/

void QGraphicsVideoItem::timerEvent(QTimerEvent *event)

{

    QGraphicsObject::timerEvent(event);

}

#include "moc_qgraphicsvideoitem.cpp"

QT_END_NAMESPACE