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     2 **

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

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

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

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

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

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

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

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

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

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

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

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

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

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

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

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    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 static const int lastMeasurementsCount = 50;

    45 

    46 class FontBlaster: public QWidget

    47 {

    48     Q_OBJECT

    49 

    50 public:

    51     FontBlaster(QWidget *parent = 0)

    52         : QWidget(parent)

    53         , m_currentMode(0)

    54     {

    55         setFocusPolicy(Qt::StrongFocus);

    56     }

    57 

    58     void paintEvent(QPaintEvent *event)

    59     {

    60         Q_UNUSED(event);

    61         QPainter p(this);

    62 

    63         if (!m_timer.isNull())

    64             m_lastMeasurements.append(m_timer.elapsed());

    65         m_timer.start();

    66 

    67         p.save();

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

    69         p.restore();

    70 

    71         const QFontMetrics fm = p.fontMetrics();

    72         p.setOpacity(0.7);

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

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

    75         p.setOpacity(1);

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

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

    78 

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

    80             m_lastMeasurements.removeFirst();

    81             int lastMsecsSum = 0;

    82             foreach(const int measurement, m_lastMeasurements)

    83                 lastMsecsSum += measurement;

    84 

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

    86                 QLatin1String("Fps: ") +

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

    88             );

    89         }

    90 

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

    92     }

    93 

    94     /*

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

    96       the glyph cache.

    97       Also: painting with different opacities, stress testing blitting.

    98     */

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

   100     {

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

   102         static const int textsPerPaint = 30;

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

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

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

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

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

   108             p.setFont(font);

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

   110                                      155 + qrand() % 100, 100 + qrand() % 155));

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

   112             const QPoint position(

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

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

   115             p.drawText(position, text);

   116         }

   117     }

   118 

   119     /*

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

   121     */

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

   123     {

   124         static const char* const pieces[] = {

   125             "lorem ipsum",

   126             "dolor sit amet",

   127             "consectetuer",

   128             "sed diam nonumy",

   129             "eos et accusam",

   130             "sea takimata sanctus"

   131         };

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

   133         static const int piecesPerPaint = 30;

   134 

   135         QString text;

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

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

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

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

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

   141                 if (i > 0)

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

   143             } else {

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

   145             }

   146             text.append(piece);

   147         }

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

   149 

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

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

   152     }

   153 

   154     /*

   155       Drawing one text with several snippets of different writingSystems, stress

   156       testing the font merging in the font database.

   157     */

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

   159     {

   160         static QStringList samples;

   161         if (samples.isEmpty()) {

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

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

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

   165         }

   166         static const int systemsPerPaint = 65;

   167         QString text;

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

   169             if (i > 0)

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

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

   172         }

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

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

   175     }

   176 

   177 protected:

   178     void nextMode()

   179     {

   180         m_currentMode = (m_currentMode + 1) % m_modesCount;

   181         m_lastMeasurements.clear();

   182     }

   183 

   184     void keyPressEvent(QKeyEvent *event)

   185     {

   186         Q_UNUSED(event);

   187         nextMode();

   188     }

   189 

   190     void mousePressEvent(QMouseEvent *event)

   191     {

   192         Q_UNUSED(event);

   193         nextMode();

   194     }

   195 

   196 private:

   197     static const struct mode {

   198         QString name;

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

   200     } m_modes[];

   201     static const int m_modesCount;

   202 

   203     int m_currentMode;

   204     QList<int> m_lastMeasurements;

   205     QTime m_timer;

   206 };

   207 

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

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

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

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

   212 };

   213 

   214 const int FontBlaster::m_modesCount =

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

   216 

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

   218 {

   219     QApplication a(argc, argv);

   220 

   221     FontBlaster dlg;

   222 #ifdef Q_OS_SYMBIAN

   223     dlg.showFullScreen();

   224 #else

   225     dlg.show();

   226 #endif

   227 

   228     return a.exec();

   229 }

   230 

   231 #include "main.moc"