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****************************************************************************/

#include <QtGui>

#include <QtDebug>

#include <private/qpaintengineex_p.h>

#include <private/qpaintbuffer_p.h>

class ReplayWidget : public QWidget

{

    Q_OBJECT

public:

    ReplayWidget(const QString &filename);

    void paintEvent(QPaintEvent *event);

public slots:

    void updateRect();

private:

    QList<QRegion> updates;

    QPaintBuffer buffer;

    int currentFrame;

    int currentIteration;

    QTime timer;

    QList<uint> iterationTimes;

    QString filename;

};

void ReplayWidget::updateRect()

{

    update(updates.at(currentFrame));

}

void ReplayWidget::paintEvent(QPaintEvent *)

{

    QPainter p(this);

//    p.setClipRegion(frames.at(currentFrame).updateRegion);

    buffer.draw(&p, currentFrame);

    ++currentFrame;

    if (currentFrame >= buffer.numFrames()) {

        currentFrame = 0;

        ++currentIteration;

        if (currentIteration == 3)

            timer.start();

        else if (currentIteration > 3) {

            iterationTimes << timer.elapsed();

            timer.restart();

            if (iterationTimes.size() >= 3) {

                qreal mean = 0;

                qreal stddev = 0;

                uint min = INT_MAX;

                for (int i = 0; i < iterationTimes.size(); ++i) {

                    mean += iterationTimes.at(i);

                    min = qMin(min, iterationTimes.at(i));

                }

                mean /= qreal(iterationTimes.size());

                for (int i = 0; i < iterationTimes.size(); ++i) {

                    qreal delta = iterationTimes.at(i) - mean;

                    stddev += delta * delta;

                }

                stddev = qSqrt(stddev / iterationTimes.size());

                qSort(iterationTimes.begin(), iterationTimes.end());

                uint median = iterationTimes.at(iterationTimes.size() / 2);

                stddev = 100 * stddev / mean;

                if (iterationTimes.size() >= 10 || stddev < 4) {

                    printf("%s, iterations: %d, frames: %d, min(ms): %d, median(ms): %d, stddev: %f %%, max(fps): %f\n", qPrintable(filename),

                            iterationTimes.size(), updates.size(), min, median, stddev, 1000. * updates.size() / min);

                    deleteLater();

                    return;

                }

            }

        }

    }

    QTimer::singleShot(0, this, SLOT(updateRect()));

}

ReplayWidget::ReplayWidget(const QString &filename_)

    : currentFrame(0)

    , currentIteration(0)

    , filename(filename_)

{

    setWindowTitle(filename);

    QFile file(filename);

    QRect bounds;

    if (file.open(QIODevice::ReadOnly)) {

        QDataStream in(&file);

        in >> buffer >> updates;

    }

    qDebug() << "Read paint buffer with" << buffer.numFrames() << "frames";

    resize(buffer.boundingRect().size().toSize());

    setAutoFillBackground(false);

    setAttribute(Qt::WA_NoSystemBackground);

    QTimer::singleShot(10, this, SLOT(updateRect()));

}

int main(int argc, char **argv)

{

    QApplication app(argc, argv);

    if (argc <= 1) {

        printf("Usage: %s filename\n", argv[0]);

        return 1;

    }

    ReplayWidget *widget = new ReplayWidget(argv[1]);

    widget->show();

    return app.exec();

}

#include "main.moc"