qt 6.5.1 original

tests/manual/textrendering/textperformance/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## textperformance Binary:
+#####################################################################
+
+qt_internal_add_manual_test(textperformance
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/textrendering/textperformance/main.cpp

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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"

tests/manual/textrendering/textperformance/textperformance.pro

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+QT += widgets
+SOURCES = main.cpp