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

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the test suite of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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** rights.  These rights are described in the Nokia Qt LGPL Exception

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** If you have questions regarding the use of this file, please contact

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

#include <QtGui>

static const int lastMeasurementsCount = 50;

class FontBlaster: public QWidget

{

    Q_OBJECT

public:

    FontBlaster(QWidget *parent = 0)

        : QWidget(parent)

        , m_currentMode(0)

    {

        setFocusPolicy(Qt::StrongFocus);

    }

    void paintEvent(QPaintEvent *event)

    {

        Q_UNUSED(event);

        QPainter p(this);

        if (!m_timer.isNull())

            m_lastMeasurements.append(m_timer.elapsed());

        m_timer.start();

        p.save();

        m_modes[m_currentMode].function(p, size());

        p.restore();

        const QFontMetrics fm = p.fontMetrics();

        p.setOpacity(0.7);

        p.fillRect(0, 0, width(), fm.height(), Qt::gray);

        p.fillRect(0, height() - fm.height(), width(), height(), Qt::gray);

        p.setOpacity(1);

        p.setPen(palette().color(QPalette::Text));

        p.drawText(2, fm.ascent(), m_modes[m_currentMode].name);

        if (m_lastMeasurements.count() == lastMeasurementsCount) {

            m_lastMeasurements.removeFirst();

            int lastMsecsSum = 0;

            foreach(const int measurement, m_lastMeasurements)

                lastMsecsSum += measurement;

            p.drawText(2, height() - fm.descent(),

                QLatin1String("Fps: ") +

                QString::number(1000 / ((qreal)lastMsecsSum / lastMeasurementsCount), 'f', 1)

            );

        }

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

    }

    /*

      Creating all kinds of size/weight/italic combinations, stress testing

      the glyph cache.

      Also: painting with different opacities, stress testing blitting.

    */

    static void paintDifferentFontStyles(QPainter &p, const QSize &size)

    {

        static const QString text = QLatin1String("Qt rocks!!!");

        static const int textsPerPaint = 30;

        for (int i = 0; i < textsPerPaint; i++) {

            const int fontSize = 4 + (qrand() % 5);

            const int fontWeight = (qrand() % 2) == 1 ? QFont::Normal : QFont::Bold;

            const bool fontItalic = (qrand() % 2) == 1;

            const QFont font("Default", fontSize, fontWeight, fontItalic);

            p.setFont(font);

            p.setPen(QColor::fromHsv(qrand() % 359, 155 + qrand() % 100,

                                     155 + qrand() % 100, 100 + qrand() % 155));

            const QSize textSize(p.fontMetrics().boundingRect(text).size());

            const QPoint position(

                -textSize.width() / 2 + (qrand() % size.width()),

                textSize.height() / 2 + (qrand() % size.height()));

            p.drawText(position, text);

        }

    }

    /*

      Drawing a multiline latin text, stress testing the text layout system.

    */

    static void paintLongLatinText(QPainter &p, const QSize &size)

    {

        static const char* const pieces[] = {

            "lorem ipsum",

            "dolor sit amet",

            "consectetuer",

            "sed diam nonumy",

            "eos et accusam",

            "sea takimata sanctus"

        };

        static const int piecesCount = (int)(sizeof pieces / sizeof pieces[0]);

        static const int piecesPerPaint = 30;

        QString text;

        for (int i = 0; i < piecesPerPaint; ++i) {

            QString piece = QLatin1String(pieces[qrand() % piecesCount]);

            if (i == 0 || qrand() % 2) {

                // Make this piece the beginning of a new sentence.

                piece[0] = piece[0].toUpper();

                if (i > 0)

                    piece.prepend(QLatin1String(". "));

            } else {

                piece.prepend(QLatin1String(", "));

            }

            text.append(piece);

        }

        text.append(QLatin1Char('.'));

        p.drawText(QRectF(QPointF(0, 0), QSizeF(size)),

                   Qt::AlignTop | Qt::AlignAbsolute | Qt::TextWordWrap, text);

    }

    /*

      Drawing one text with several snippets of different writingSystems, stress

      testing the font merging in the font database.

    */

    static void paintInternationalText(QPainter &p, const QSize &size)

    {

        static QStringList samples;

        if (samples.isEmpty()) {

            foreach (const QFontDatabase::WritingSystem system, QFontDatabase().writingSystems())

                if (system != QFontDatabase::Ogham && system != QFontDatabase::Runic)

                    samples.append(QFontDatabase::writingSystemSample(system));

        }

        static const int systemsPerPaint = 65;

        QString text;

        for (int i = 0; i < systemsPerPaint; i++) {

            if (i > 0)

                text.append(QLatin1Char(' '));

            text.append(samples.at(qrand() % samples.count()));

        }

        p.drawText(QRectF(QPointF(0, 0), QSizeF(size)),

                   Qt::AlignTop | Qt::AlignAbsolute | Qt::TextWordWrap, text);

    }

protected:

    void nextMode()

    {

        m_currentMode = (m_currentMode + 1) % m_modesCount;

        m_lastMeasurements.clear();

    }

    void keyPressEvent(QKeyEvent *event)

    {

        Q_UNUSED(event);

        nextMode();

    }

    void mousePressEvent(QMouseEvent *event)

    {

        Q_UNUSED(event);

        nextMode();

    }

private:

    static const struct mode {

        QString name;

        void (*function)(QPainter &, const QSize&);

    } m_modes[];

    static const int m_modesCount;

    int m_currentMode;

    QList<int> m_lastMeasurements;

    QTime m_timer;

};

const struct FontBlaster::mode FontBlaster::m_modes[] = {

    { QLatin1String("Qt rocks!!!"), FontBlaster::paintDifferentFontStyles },

    { QLatin1String("Latin"), FontBlaster::paintLongLatinText },

    { QLatin1String("International"), FontBlaster::paintInternationalText }

};

const int FontBlaster::m_modesCount =

    (int)(sizeof m_modes / sizeof m_modes[0]);

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    FontBlaster dlg;

#ifdef Q_OS_SYMBIAN

    dlg.showFullScreen();

#else

    dlg.show();

#endif

    return a.exec();

}

#include "main.moc"