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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QApplication>
#include <QDialog>
#include <QFontDatabase>
#include <QPainter>
#include <QRandomGenerator>
#include <QElapsedTimer>
#include <QTimer>
static const int lastMeasurementsCount = 50;
class FontBlaster: public QWidget
{
Q_OBJECT
public:
FontBlaster(QWidget *parent = nullptr)
: QWidget(parent)
, m_currentMode(0)
{
setFocusPolicy(Qt::StrongFocus);
}
void paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter p(this);
if (m_timer.isValid())
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 + QRandomGenerator::global()->bounded(5);
const int fontWeight = QRandomGenerator::global()->bounded(2) == 1 ? QFont::Normal : QFont::Bold;
const bool fontItalic = QRandomGenerator::global()->bounded(2) == 1;
const QFont font("Default", fontSize, fontWeight, fontItalic);
p.setFont(font);
p.setPen(QColor::fromHsv(QRandomGenerator::global()->bounded(359), 155 + QRandomGenerator::global()->bounded(100),
155 + QRandomGenerator::global()->bounded(100), 100 + QRandomGenerator::global()->bounded(155)));
const QSize textSize(p.fontMetrics().boundingRect(text).size());
const QPoint position(
-textSize.width() / 2 + QRandomGenerator::global()->bounded(size.width()),
textSize.height() / 2 + QRandomGenerator::global()->bounded(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[QRandomGenerator::global()->bounded(piecesCount)]);
if (i == 0 || QRandomGenerator::global()->bounded(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(QRandomGenerator::global()->bounded(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;
QElapsedTimer 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;
dlg.show();
return a.exec();
}
#include "main.moc"
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