/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the tools applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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#include <QtDebug>+
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+
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#include <private/qpaintengineex_p.h>+
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#include <private/qpaintbuffer_p.h>+
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+
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class ReplayWidget : public QWidget+
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{+
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    Q_OBJECT+
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public:+
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    ReplayWidget(const QString &filename);+
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+
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    void paintEvent(QPaintEvent *event);+
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+
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public slots:+
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    void updateRect();+
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+
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private:+
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    QList<QRegion> updates;+
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    QPaintBuffer buffer;+
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+
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    int currentFrame;+
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    int currentIteration;+
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    QTime timer;+
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+
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    QList<uint> iterationTimes;+
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    QString filename;+
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};+
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+
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void ReplayWidget::updateRect()+
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{+
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    update(updates.at(currentFrame));+
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}+
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+
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void ReplayWidget::paintEvent(QPaintEvent *)+
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{+
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    QPainter p(this);+
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+
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//    p.setClipRegion(frames.at(currentFrame).updateRegion);+
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+
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    buffer.draw(&p, currentFrame);+
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+
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    ++currentFrame;+
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    if (currentFrame >= buffer.numFrames()) {+
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        currentFrame = 0;+
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        ++currentIteration;+
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+
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        if (currentIteration == 3)+
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            timer.start();+
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        else if (currentIteration > 3) {+
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            iterationTimes << timer.elapsed();+
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            timer.restart();+
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+
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            if (iterationTimes.size() >= 3) {+
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                qreal mean = 0;+
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                qreal stddev = 0;+
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                uint min = INT_MAX;+
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+
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                for (int i = 0; i < iterationTimes.size(); ++i) {+
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                    mean += iterationTimes.at(i);+
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                    min = qMin(min, iterationTimes.at(i));+
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                }+
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+
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                mean /= qreal(iterationTimes.size());+
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+
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                for (int i = 0; i < iterationTimes.size(); ++i) {+
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                    qreal delta = iterationTimes.at(i) - mean;+
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                    stddev += delta * delta;+
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                }+
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+
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                stddev = qSqrt(stddev / iterationTimes.size());+
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+
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                qSort(iterationTimes.begin(), iterationTimes.end());+
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                uint median = iterationTimes.at(iterationTimes.size() / 2);+
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+
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                stddev = 100 * stddev / mean;+
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+
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                if (iterationTimes.size() >= 10 || stddev < 4) {+
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                    printf("%s, iterations: %d, frames: %d, min(ms): %d, median(ms): %d, stddev: %f %%, max(fps): %f\n", qPrintable(filename),+
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                            iterationTimes.size(), updates.size(), min, median, stddev, 1000. * updates.size() / min);+
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                    deleteLater();+
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                    return;+
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                }+
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            }+
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        }+
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    }+
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+
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    QTimer::singleShot(0, this, SLOT(updateRect()));+
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}+
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+
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ReplayWidget::ReplayWidget(const QString &filename_)+
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    : currentFrame(0)+
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    , currentIteration(0)+
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    , filename(filename_)+
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{+
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    setWindowTitle(filename);+
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    QFile file(filename);+
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+
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    QRect bounds;+
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    if (file.open(QIODevice::ReadOnly)) {+
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        QDataStream in(&file);+
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        in >> buffer >> updates;+
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    }+
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+
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    qDebug() << "Read paint buffer with" << buffer.numFrames() << "frames";+
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+
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    resize(buffer.boundingRect().size().toSize());+
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+
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    setAutoFillBackground(false);+
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    setAttribute(Qt::WA_NoSystemBackground);+
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+
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    QTimer::singleShot(10, this, SLOT(updateRect()));+
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}+
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+
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int main(int argc, char **argv)+
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{+
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    QApplication app(argc, argv);+
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+
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    if (argc <= 1) {+
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        printf("Usage: %s filename\n", argv[0]);+
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        return 1;+
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    }+
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+
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    ReplayWidget *widget = new ReplayWidget(argv[1]);+
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    widget->show();+
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+
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    return app.exec();+
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}+
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#include "main.moc"+
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