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#include "videowidgetsurface.h"

#include <QtMultimedia>

VideoWidgetSurface::VideoWidgetSurface(QWidget *widget, QObject *parent)

    : QAbstractVideoSurface(parent)

    , widget(widget)

    , imageFormat(QImage::Format_Invalid)

{

}

//! [0]

QList<QVideoFrame::PixelFormat> VideoWidgetSurface::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>();

    }

}

//! [0]

//! [1]

bool VideoWidgetSurface::isFormatSupported(

        const QVideoSurfaceFormat &format, QVideoSurfaceFormat *similar) const

{

    Q_UNUSED(similar);

    const QImage::Format imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat());

    const QSize size = format.frameSize();

    return imageFormat != QImage::Format_Invalid

            && !size.isEmpty()

            && format.handleType() == QAbstractVideoBuffer::NoHandle;

}

//! [1]

//! [2]

bool VideoWidgetSurface::start(const QVideoSurfaceFormat &format)

{

    const QImage::Format imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat());

    const QSize size = format.frameSize();

    if (imageFormat != QImage::Format_Invalid && !size.isEmpty()) {

        this->imageFormat = imageFormat;

        imageSize = size;

        sourceRect = format.viewport();

        QAbstractVideoSurface::start(format);

        widget->updateGeometry();

        updateVideoRect();

        return true;

    } else {

        return false;

    }

}

//! [2]

//! [3]

void VideoWidgetSurface::stop()

{

    currentFrame = QVideoFrame();

    targetRect = QRect();

    QAbstractVideoSurface::stop();

    widget->update();

}

//! [3]

//! [4]

bool VideoWidgetSurface::present(const QVideoFrame &frame)

{

    if (surfaceFormat().pixelFormat() != frame.pixelFormat()

            || surfaceFormat().frameSize() != frame.size()) {

        setError(IncorrectFormatError);

        stop();

        return false;

    } else {

        currentFrame = frame;

        widget->repaint(targetRect);

        return true;

    }

}

//! [4]

//! [5]

void VideoWidgetSurface::updateVideoRect()

{

    QSize size = surfaceFormat().sizeHint();

    size.scale(widget->size().boundedTo(size), Qt::KeepAspectRatio);

    targetRect = QRect(QPoint(0, 0), size);

    targetRect.moveCenter(widget->rect().center());

}

//! [5]

//! [6]

void VideoWidgetSurface::paint(QPainter *painter)

{

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

        const QTransform oldTransform = painter->transform();

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

           painter->scale(1, -1);

           painter->translate(0, -widget->height());

        }

        QImage image(

                currentFrame.bits(),

                currentFrame.width(),

                currentFrame.height(),

                currentFrame.bytesPerLine(),

                imageFormat);

        painter->drawImage(targetRect, image, sourceRect);

        painter->setTransform(oldTransform);

        currentFrame.unmap();

    }

}

//! [6]