qt 6.5.1 original

tests/manual/textrendering/CMakeLists.txt

@@ -0,0 +1,6 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+add_subdirectory(glyphshaping)
+add_subdirectory(textperformance)
+add_subdirectory(nativetext)

tests/manual/textrendering/codeeditor/CMakeLists.txt

@@ -0,0 +1,37 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(codeeditor LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/widgets/codeeditor")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(codeeditor
+    codeeditor.cpp codeeditor.h
+    main.cpp
+)
+
+set_target_properties(codeeditor PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(codeeditor PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS codeeditor
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/textrendering/codeeditor/codeeditor.cpp

@@ -0,0 +1,134 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "codeeditor.h"
+
+#include <QPainter>
+#include <QTextBlock>
+
+//![constructor]
+
+CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
+{
+    lineNumberArea = new LineNumberArea(this);
+
+    connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth);
+    connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea);
+    connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine);
+
+    updateLineNumberAreaWidth(0);
+    highlightCurrentLine();
+}
+
+//![constructor]
+
+//![extraAreaWidth]
+
+int CodeEditor::lineNumberAreaWidth()
+{
+    int digits = 1;
+    int max = qMax(1, blockCount());
+    while (max >= 10) {
+        max /= 10;
+        ++digits;
+    }
+
+    int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits;
+
+    return space;
+}
+
+//![extraAreaWidth]
+
+//![slotUpdateExtraAreaWidth]
+
+void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
+{
+    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
+}
+
+//![slotUpdateExtraAreaWidth]
+
+//![slotUpdateRequest]
+
+void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
+{
+    if (dy)
+        lineNumberArea->scroll(0, dy);
+    else
+        lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
+
+    if (rect.contains(viewport()->rect()))
+        updateLineNumberAreaWidth(0);
+}
+
+//![slotUpdateRequest]
+
+//![resizeEvent]
+
+void CodeEditor::resizeEvent(QResizeEvent *e)
+{
+    QPlainTextEdit::resizeEvent(e);
+
+    QRect cr = contentsRect();
+    lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
+}
+
+//![resizeEvent]
+
+//![cursorPositionChanged]
+
+void CodeEditor::highlightCurrentLine()
+{
+    QList<QTextEdit::ExtraSelection> extraSelections;
+
+    if (!isReadOnly()) {
+        QTextEdit::ExtraSelection selection;
+
+        QColor lineColor = QColor(Qt::yellow).lighter(160);
+
+        selection.format.setBackground(lineColor);
+        selection.format.setProperty(QTextFormat::FullWidthSelection, true);
+        selection.cursor = textCursor();
+        selection.cursor.clearSelection();
+        extraSelections.append(selection);
+    }
+
+    setExtraSelections(extraSelections);
+}
+
+//![cursorPositionChanged]
+
+//![extraAreaPaintEvent_0]
+
+void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
+{
+    QPainter painter(lineNumberArea);
+    painter.fillRect(event->rect(), Qt::lightGray);
+
+//![extraAreaPaintEvent_0]
+
+//![extraAreaPaintEvent_1]
+    QTextBlock block = firstVisibleBlock();
+    int blockNumber = block.blockNumber();
+    int top = qRound(blockBoundingGeometry(block).translated(contentOffset()).top());
+    int bottom = top + qRound(blockBoundingRect(block).height());
+//![extraAreaPaintEvent_1]
+
+//![extraAreaPaintEvent_2]
+    while (block.isValid() && top <= event->rect().bottom()) {
+        if (block.isVisible() && bottom >= event->rect().top()) {
+            QString number = QString::number(blockNumber + 1);
+            painter.setPen(Qt::black);
+            painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
+                             Qt::AlignRight, number);
+        }
+
+        block = block.next();
+        top = bottom;
+        bottom = top + qRound(blockBoundingRect(block).height());
+        ++blockNumber;
+    }
+}
+//![extraAreaPaintEvent_2]
+

tests/manual/textrendering/codeeditor/codeeditor.h

@@ -0,0 +1,68 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef CODEEDITOR_H
+#define CODEEDITOR_H
+
+#include <QPlainTextEdit>
+
+QT_BEGIN_NAMESPACE
+class QPaintEvent;
+class QResizeEvent;
+class QSize;
+class QWidget;
+QT_END_NAMESPACE
+
+class LineNumberArea;
+
+//![codeeditordefinition]
+
+class CodeEditor : public QPlainTextEdit
+{
+    Q_OBJECT
+
+public:
+    CodeEditor(QWidget *parent = nullptr);
+
+    void lineNumberAreaPaintEvent(QPaintEvent *event);
+    int lineNumberAreaWidth();
+
+protected:
+    void resizeEvent(QResizeEvent *event) override;
+
+private slots:
+    void updateLineNumberAreaWidth(int newBlockCount);
+    void highlightCurrentLine();
+    void updateLineNumberArea(const QRect &rect, int dy);
+
+private:
+    QWidget *lineNumberArea;
+};
+
+//![codeeditordefinition]
+//![extraarea]
+
+class LineNumberArea : public QWidget
+{
+public:
+    LineNumberArea(CodeEditor *editor) : QWidget(editor), codeEditor(editor)
+    {}
+
+    QSize sizeHint() const override
+    {
+        return QSize(codeEditor->lineNumberAreaWidth(), 0);
+    }
+
+protected:
+    void paintEvent(QPaintEvent *event) override
+    {
+        codeEditor->lineNumberAreaPaintEvent(event);
+    }
+
+private:
+    CodeEditor *codeEditor;
+};
+
+//![extraarea]
+
+#endif

tests/manual/textrendering/codeeditor/codeeditor.pro

@@ -0,0 +1,8 @@
+QT += widgets
+
+HEADERS     = codeeditor.h
+SOURCES     = main.cpp \
+              codeeditor.cpp
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/widgets/codeeditor
+INSTALLS += target

tests/manual/textrendering/codeeditor/codeeditor.qdoc

@@ -0,0 +1,173 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example widgets/codeeditor
+    \title Code Editor Example
+    \ingroup examples-widgets
+    \brief The Code Editor example shows how to create a simple editor that
+    has line numbers and that highlights the current line.
+
+    \borderedimage codeeditor-example.png
+
+    As can be seen from the image, the editor displays the line
+    numbers in an area to the left of the area for editing. The editor
+    will highlight the line containing the cursor.
+
+    We implement the editor in \c CodeEditor, which is a widget that
+    inherits QPlainTextEdit. We keep a separate widget in \c
+    CodeEditor (\c LineNumberArea) onto which we draw the line
+    numbers.
+
+    QPlainTextEdit inherits from QAbstractScrollArea, and editing
+    takes place within its \l{QAbstractScrollArea::}{viewport()}'s
+    margins. We make room for our line number area by setting the left
+    margin of the viewport to the size we need to draw the line
+    numbers.
+
+    When it comes to editing code, we prefer QPlainTextEdit over
+    QTextEdit because it is optimized for handling plain text. See
+    the QPlainTextEdit class description for details.
+
+    QPlainTextEdit lets us add selections in addition to the
+    selection the user can make with the mouse or keyboard. We use
+    this functionality to highlight the current line. More on this
+    later.
+
+    We will now move on to the definitions and implementations of \c
+    CodeEditor and \c LineNumberArea. Let's start with the \c
+    LineNumberArea class.
+
+    \section1 The LineNumberArea Class
+
+    We paint the line numbers on this widget, and place it over the \c
+    CodeEditor's \l{QAbstractScrollArea::}{viewport()}'s left margin
+    area.
+
+    We need to use protected functions in QPlainTextEdit while
+    painting the area. So to keep things simple, we  paint the area in
+    the \c CodeEditor class. The area also asks the editor to
+    calculate its size hint.
+
+    Note that we could simply paint the line numbers directly on the
+    code editor, and drop the LineNumberArea class. However, the
+    QWidget class helps us to \l{QWidget::}{scroll()} its contents.
+    Also, having a separate widget is the right choice if we wish to
+    extend the editor with breakpoints or other code editor features.
+    The widget would then help in the handling of mouse events.
+
+    \snippet widgets/codeeditor/codeeditor.h extraarea
+
+    \section1 CodeEditor Class Definition
+
+    Here is the code editor's class definition:
+
+    \snippet widgets/codeeditor/codeeditor.h codeeditordefinition
+
+    In the editor we resize and draw the line numbers on the \c
+    LineNumberArea. We need to do this when the number of lines in the
+    editor changes, and when the editor's viewport() is scrolled. Of
+    course, it is also done when the editor's size changes. We do
+    this in \c updateLineNumberWidth() and \c updateLineNumberArea().
+
+    Whenever, the cursor's position changes, we highlight the current
+    line in \c highlightCurrentLine().
+
+    \section1 CodeEditor Class Implementation
+
+    We will now go through the code editors implementation, starting
+    off with the constructor.
+
+    \snippet widgets/codeeditor/codeeditor.cpp constructor
+
+    In the constructor we connect our slots to signals in
+    QPlainTextEdit. It is necessary to calculate the line number area
+    width and highlight the first line when the editor is created.
+
+    \snippet widgets/codeeditor/codeeditor.cpp extraAreaWidth
+
+    The \c lineNumberAreaWidth() function calculates the width of the
+    \c LineNumberArea widget. We take the number of digits in the last
+    line of the editor and multiply that with the maximum width of a
+    digit.
+
+    \snippet widgets/codeeditor/codeeditor.cpp slotUpdateExtraAreaWidth
+
+    When we update the width of the line number area, we simply call
+    QAbstractScrollArea::setViewportMargins().
+
+    \snippet widgets/codeeditor/codeeditor.cpp slotUpdateRequest
+
+    This slot is invoked when the editors viewport has been scrolled.
+    The QRect given as argument is the part of the editing area that
+    is do be updated (redrawn). \c dy holds the number of pixels the
+    view has been scrolled vertically.
+
+    \snippet widgets/codeeditor/codeeditor.cpp resizeEvent
+
+    When the size of the editor changes, we also need to resize the
+    line number area.
+
+    \snippet widgets/codeeditor/codeeditor.cpp cursorPositionChanged
+
+    When the cursor position changes, we highlight the current line,
+    i.e., the line containing the cursor.
+
+    QPlainTextEdit gives the possibility to have more than one
+    selection at the same time. we can set the character format
+    (QTextCharFormat) of these selections. We clear the cursors
+    selection before setting the new new
+    QPlainTextEdit::ExtraSelection, else several lines would get
+    highlighted when the user selects multiple lines with the mouse.
+    \omit ask someone how this works \endomit
+
+    One sets the selection with a text cursor. When using the
+    FullWidthSelection property, the current cursor text block (line)
+    will be selected. If you want to select just a portion of the text
+    block, the cursor should be moved with QTextCursor::movePosition()
+    from a position set with \l{QTextCursor::}{setPosition()}.
+
+    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_0
+
+    The \c lineNumberAreaPaintEvent() is called from \c LineNumberArea
+    whenever it receives a paint event. We start off by painting the
+    widget's background.
+
+    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_1
+
+    We will now loop through all visible lines and paint the line
+    numbers in the extra area for each line. Notice that in a plain
+    text edit each line will consist of one QTextBlock; though, if
+    line wrapping is enabled, a line may span several rows in the text
+    edit's viewport.
+
+    We get the top and bottom y-coordinate of the first text block,
+    and adjust these values by the height of the current text block in
+    each iteration in the loop.
+
+    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_2
+
+    Notice that we check if the block is visible in addition to check
+    if it is in the areas viewport - a block can, for example, be
+    hidden by a window placed over the text edit.
+
+    \section1 Suggestions for Extending the Code Editor
+
+    No self-respecting code editor is without a syntax
+    highligther; the \l{Syntax Highlighter Example} shows how to
+    create one.
+
+    In addition to line numbers, you can add more to the extra area,
+    for instance, break points.
+
+    QSyntaxHighlighter gives the possibility to add user data to each
+    text block with
+    \l{QSyntaxHighlighter::}{setCurrentBlockUserData()}. This can be
+    used to implement parenthesis matching. In the \c
+    highlightCurrentLine(), the data of the currentBlock() can be
+    fetched with QTextBlock::userData(). Matching parentheses can be
+    highlighted with an extra selection. The "Matching Parentheses
+    with QSyntaxHighlighter" article in Qt Quarterly 31 implements
+    this. You find it here: \l{http://doc.qt.io/archives/qq/}.
+
+*/

tests/manual/textrendering/codeeditor/main.cpp

@@ -0,0 +1,18 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "codeeditor.h"
+
+int main(int argv, char **args)
+{
+    QApplication app(argv, args);
+
+    CodeEditor editor;
+    editor.setWindowTitle(QObject::tr("Code Editor Example"));
+    editor.show();
+
+    return app.exec();
+}
+

tests/manual/textrendering/glyphshaping/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## glyphshaping Binary:
+#####################################################################
+
+qt_internal_add_manual_test(glyphshaping
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/textrendering/glyphshaping/glyphshaping.pro

@@ -0,0 +1,5 @@
+QT += widgets
+SOURCES = main.cpp
+glyphshaping_data.path = .
+glyphshaping_data.files = $$PWD/glyphshaping_data.xml
+DEPLOYMENT += glyphshaping_data

tests/manual/textrendering/glyphshaping/glyphshaping_data.xml

@@ -0,0 +1,251 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<shapingtests>
+
+    <language name="Vietnamese">
+        <test
+            name="capital U, combining horn"
+            inpututf16="0x0055, 0x031B"
+            outpututf16="0x01AF"
+        />
+        <test
+            name="capital U, apostrophe"
+            inpututf16="0x0055, 0x0027"
+            outpututf16="0x0055"
+        />
+        <test
+            name="capital U, modifier prime"
+            inpututf16="0x0055, 0x02B9"
+            outpututf16="0x0055"
+        />
+        <test
+            name="capital U, modifier apostrophe"
+            inpututf16="0x0055, 0x02BC"
+            outpututf16="0x0055"
+        />
+        <test
+            name="capital U, combining comma above right"
+            inpututf16="0x0055, 0x0315"
+            outpututf16="0x0055, 0x0315"
+        />
+        <test
+            name="capital U, right single quote mark"
+            inpututf16="0x0055, 0x2019"
+            outpututf16="0x0055"
+        />
+        <test
+            name="capital U with horn, space"
+            inpututf16="0x01AF, 0x0020"
+            outpututf16="0x01AF"
+        />
+        <test
+            name="capital E, combining horn"
+            inpututf16="0x0045, 0x031B"
+            outpututf16="0x0045, 0x031B"
+        />
+        <test
+            name="capital A, combining breve, combining acute"
+            inpututf16="0x0041, 0x0306, 0x0301"
+            outpututf16="0x1EAE"
+        />
+        <test
+            name="capital A with breve, combining acute"
+            inpututf16="0x0102, 0x0301"
+            outpututf16="0x1EAE"
+        />
+        <test
+            name="capital A, combining acute, combining breve"
+            inpututf16="0x0041, 0x0301, 0x0306"
+            outpututf16="0x0041, 0x0301, 0x0306"
+        />
+        <test
+            name="capital A, combining dot below, combining breve"
+            inpututf16="0x0041, 0x0323"
+            outpututf16="0x0306"
+        />
+        <test
+            name="capital A with dot below, combining breve"
+            inpututf16="0x1EA0, 0x0306"
+            outpututf16="0x1EB6"
+        />
+        <test
+            name="capital A with breve, combining dot below"
+            inpututf16="0x0102, 0x0323"
+            outpututf16="0x0102, 0x0323"
+        />
+        <test
+            name="capital E, combining circumflex, combining acute"
+            inpututf16="0x0045, 0x0302, 0x0301"
+            outpututf16="0x1EBE"
+        />
+        <test
+            name="capital E with circumflex, combining acute"
+            inpututf16="0x00CA, 0x0301"
+            outpututf16="0x1EBE"
+        />
+        <test
+            name="capital O, combining horn, combining hook above"
+            inpututf16="0x004F, 0x031B, 0x0309"
+            outpututf16="0x1EDE"
+        />
+        <test
+            name="capital O with horn, combining hook above"
+            inpututf16="0x01A0, 0x0309"
+            outpututf16="0x1EDE"
+        />
+    </language>
+
+    <language name="Tamil">
+        <test
+            name="Tamil Ka"
+            inpututf16="0x0B95"
+            outputglyphids="0x0bf6"
+        />
+        <test
+            name="Tamil e"
+            inpututf16="0x0B8E"
+            outputglyphids="0x0bf0"
+        />
+        <test
+            name="Latin A"
+            inpututf16="0x0061"
+            outpututf16="0x0061"
+        />
+        <test
+            name="Hindi Ka"
+            inpututf16="0x0905"
+            outputglyphids="0x0528"
+        />
+        <test
+            name="03 - 1: Latin 06"
+            inpututf16="0x0036"
+            outputglyphids="0x077A"
+        />
+        <test
+            name="03 - 2: Tamil 06"
+            inpututf16="0x0BEC"
+            outputglyphids="0x0c20"
+        />
+        <test
+            name="10 1.3.6 - 1: Pa, Virama, Ka, Virama, Tta, -e"
+            inpututf16="0x0BAA, 0x0BCD, 0x0B95, 0x0BCD, 0x0B9F, 0x0BC7"
+            outputglyphids="0x0c3a, 0x0c30, 0x0c13, 0x0bfb"
+        />
+        <test
+            name="10 1.3.6 - 2: Pa, Virama, Ka, AU"
+            inpututf16="0x0BAA, 0x0BCD, 0x0B95, 0x0BCC"
+            outputglyphids="0x0c3a, 0x0c12, 0x0bf6, 0x0c19"
+        />
+        <test
+            name="10 1.3.6 - 3: Ka, Virama, Ssa, OO"
+            inpututf16="0x0B95, 0x0BCD, 0x0BB7, 0x0BCB"
+            outputglyphids="0x0c13, 0x0c2f, 0x0c0d"
+        />
+        <test
+            name="11: Ka, -e"
+            inpututf16="0x0B95, 0x0BC7"
+            outputglyphids="0x0c13, 0x0bf6"
+        />
+        <test
+            name="12 1.3.5.2: Ka, O"
+            inpututf16="0x0B95, 0x0BCA"
+            outputglyphids="0x0c12, 0x0bf6, 0x0c0d"
+        />
+        <test
+            name="13 - 1: Ka"
+            inpututf16="0x0B95"
+            outputglyphids="0x0bf6"
+        />
+        <test
+            name="13 - 2: Aythem, A"
+            inpututf16="0x0B83, 0x0B85"
+        />
+        <test
+            name="14 - 1: Ka, Anusvara"
+            inpututf16="0x0B95, 0x0B82"
+            outputglyphids="0x0bf6, 0x0be8"
+        />
+        <test
+            name="14 - 2: Ka"
+            inpututf16="0x0B95"
+            outputglyphids="0x0bf6"
+        />
+        <test
+            name="15 - 1: Ra, Virama"
+            inpututf16="0x0BB0, 0x0BCD"
+            outputglyphids="0x0c03"
+        />
+        <test
+            name="15 - 2: ZWJ"
+            inpututf16="0x8205"
+        />
+        <test
+            name="16: Ka, Anusvara"
+            inpututf16="0x0B95, 0x0B82"
+            outputglyphids="0x0bf6"
+        />
+        <test
+            name="17 1.3.11 - 1: Tta, I"
+            inpututf16="0x0B9F, 0x0BBF"
+            outputglyphids="0x0c51"
+        />
+        <test
+            name="17 1.3.11 - 2: Tta, Ii"
+            inpututf16="0x0B9F, 0x0BC0"
+            outputglyphids="0x0c52"
+        />
+        <test
+            name="18 - 1: Ra, I"
+            inpututf16="0x0BB0, 0x0BBF"
+            outputglyphids="0x0c0d, 0x0c0e"
+        />
+        <test
+            name="18 - 2: Ra, Ii"
+            inpututf16="0x0BB0, 0x0BC0"
+            outputglyphids="0x0c0d, 0x0c0f"
+        />
+        <test
+            name="19 - 1: Nga, I"
+            inpututf16="0x0B99, 0x0BBF"
+            outputglyphids="0x0bf7, 0x0c0e"
+        />
+        <test
+            name="19 - 2: Nga, Ii"
+            inpututf16="0x0B99, 0x0BC0"
+            outputglyphids="0x0c4a"
+        />
+        <test
+            name="20 - 1: Ja, U"
+            inpututf16="0x0B9C, 0x0BC1"
+            outputglyphids="0x0bf9, 0x0c10"
+        />
+        <test
+            name="20 - 2: Ja, Uu"
+            inpututf16="0x0B9C, 0x0BC2"
+            outputglyphids="0x0bf9, 0x0c11"
+        />
+        <test
+            name="21 1.3.15: Ka, Ai"
+            inpututf16="0x0B95, 0x0BC8"
+            outputglyphids="0x0c14, 0x0bf6"
+        />
+        <test
+            name="22: Ka, Virama, Ssa"
+            inpututf16="0x0B95, 0x0BCD, 0x0BB7"
+            outputglyphids="0x0c2f"
+        />
+        <test
+            name="23 1.3.17: Sa, Virama, Ra, Matra I"
+            inpututf16="0x0BB8, 0x0BCD, 0x0BB0, 0x0BC0"
+            outputglyphids="0x0c79"
+        />
+        <test
+            name="24 1.3.18 - 1: Ka"
+            inpututf16="0x0B95"
+            outputglyphids="0x0bf6"
+        />
+        <test
+            name="24 1.3.18 - 2: Virama, ZWJ"
+            inpututf16="0x0BCD, 0x8205"
+        />
+    </language>
+</shapingtests>

tests/manual/textrendering/glyphshaping/main.cpp

@@ -0,0 +1,235 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QApplication>
+#include <QDir>
+#include <QFile>
+#include <QFontMetrics>
+#include <QImage>
+#include <QList>
+#include <QPainter>
+#include <QStringList>
+#include <QXmlStreamReader>
+
+static const int fontPixelSize = 25;
+static const QLatin1String fontFamily("Series 60 Sans");
+
+struct testDataSet
+{
+    QString language;
+    QString name;
+    QString input;
+    QString inputOriginal;
+    QString output;
+    QString outputOriginal;
+    QList<uint> outputGlyphIDs;
+    QString outputGlyphIDsOriginal;
+};
+
+QString charHexCsv2String(const QString &csv)
+{
+    QString result;
+    foreach (const QString &charString, csv.split(QLatin1Char(','), Qt::SkipEmptyParts)) {
+        bool isOk;
+        const uint charUInt = charString.toUInt(&isOk, 16);
+        Q_ASSERT(isOk);
+        const int size = charUInt >= SHRT_MAX ? 2:1;
+        result.append(QString::fromUtf16((const ushort*)&charUInt, size));
+    }
+    return result;
+}
+
+QList<testDataSet> testDataSetList()
+{
+    QList<testDataSet> result;
+    QFile file("glyphshaping_data.xml");
+    const bool success = file.open(QIODevice::ReadOnly);
+    Q_ASSERT(success);
+
+    const QLatin1String language("language");
+    const QLatin1String test("test");
+    const QLatin1String inputUtf16("inpututf16");
+    const QLatin1String outputUtf16("outpututf16");
+    const QLatin1String outputGlyphIDs("outputglyphids");
+    const QLatin1String name("name");
+
+    QString languageName;
+
+    QXmlStreamReader reader(&file);
+    while (!reader.atEnd()) {
+        const QXmlStreamReader::TokenType token = reader.readNext();
+        switch (token) {
+        case QXmlStreamReader::StartElement:
+            if (reader.name() == language) {
+                Q_ASSERT(reader.attributes().hasAttribute(name));
+                languageName = reader.attributes().value(name).toString();
+            } else if (reader.name() == test) {
+                if (!reader.attributes().hasAttribute(outputUtf16)
+                    && !reader.attributes().hasAttribute(outputGlyphIDs))
+                    continue;
+                Q_ASSERT(!languageName.isEmpty());
+                Q_ASSERT(reader.attributes().hasAttribute(name));
+                Q_ASSERT(reader.attributes().hasAttribute(inputUtf16));
+                testDataSet set;
+                set.language = languageName;
+                set.name = reader.attributes().value(name).toString();
+                set.inputOriginal = reader.attributes().value(inputUtf16).toString();
+                set.input = charHexCsv2String(set.inputOriginal);
+                set.outputOriginal = reader.attributes().value(outputUtf16).toString();
+                set.output = charHexCsv2String(set.outputOriginal);
+                set.outputGlyphIDsOriginal = reader.attributes().value(outputGlyphIDs).toString();
+                result.append(set);
+            }
+            break;
+        default:
+            break;
+        }
+    }
+    return result;
+}
+
+QImage renderedText(const QString &text, const QFont &font)
+{
+    const QFontMetrics metrics(font);
+    const QRect boundingRect = metrics.boundingRect(text);
+    QImage result(boundingRect.size(), QImage::Format_ARGB32);
+    result.fill(0);
+
+    QPainter p(&result);
+    p.setFont(font);
+    p.drawText(boundingRect.translated(-boundingRect.topLeft()), text);
+
+    return result;
+}
+
+QString dumpImageHtml(const QString &text, const QString &pathName)
+{
+    if (text.isEmpty())
+        return QLatin1String("<td/>");
+    QFont font(fontFamily);
+    font.setPixelSize(fontPixelSize);
+    const QImage textImage = renderedText(text, font);
+    const QString imageFileName =
+            (pathName + QDir::separator() + QLatin1String("%1.png"))
+            .arg(textImage.cacheKey());
+    const bool success = textImage.save(imageFileName);
+    Q_ASSERT(success);
+    return
+        QString::fromLatin1("<td title=\"%2\"><img src=\"%1\" alt=\"%2\" width=\"%3\" height=\"%4\"/></td>")
+        .arg(QDir::cleanPath(imageFileName)).arg(text).arg(textImage.width()).arg(textImage.height());
+}
+
+QString dlItem(const QString &dt, const QString &dd)
+{
+    if (!dd.trimmed().isEmpty())
+        return QString::fromLatin1("\t\t\t\t\t\t<dt>%1</dt><dd>%2</dd>\n").arg(dt).arg(dd);
+    return QString();
+}
+
+bool dumpHtml(const QString &pathName)
+{
+    QFile htmlPage(pathName + QDir::separator() + QLatin1String("index.html"));
+    if (!htmlPage.open(QFile::WriteOnly))
+        return false;
+
+    QString platformName = QString::fromLatin1(
+#if defined(Q_OS_WIN)
+            "Win32"
+#else
+            ""
+#endif
+    );
+
+    QString result = QString::fromLatin1(
+            "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\"\n"
+            " \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n\n"
+            "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\">\n"
+            "\t<head>\n"
+            "\t\t<title>Qt on %1 glyph shaping (%2)</title>\n"
+            "\t\t<meta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\" />\n"
+            "\t\t<style type=\"text/css\" media=\"screen\">\n"
+            "\t\t\ttable { font-family: Arial; background-color: #ccccff; font-size: 12pt; }\n"
+            "\t\t\ttd { font-family:\"%2\"; background-color: #eeeeee; font-size: %3px; }\n"
+            "\t\t\tth { font-weight:normal; }\n"
+            "\t\t\tdl { font-family: Arial; font-size: 8pt; margin: 3px; }\n"
+            "\t\t\tdt { font-weight: bold; float: left; }\n"
+            "\t\t\ttr:hover { background-color: #ddddff; }\n"
+            "\t\t\ttd:hover { background-color: #ddddff; }\n"
+            "\t\t</style>\n"
+            "\t</head>\n"
+            "\t<body>\n"
+            "\t\t<h1>Qt on %1 glyph shaping (%2)</h1>\n"
+            "\t\t<dl>\n"
+            "\t\t\t<dt>I</dt><dd>Input Utf-16 to shaper</dd>\n"
+            "\t\t\t<dt>O-Utf</dt><dd>expected output Utf-16</dd>\n"
+            "\t\t\t<dt>O-ID</dt><dd>expected output Glyph IDs for \"Series 60 Sans\"</dd>\n"
+            "\t\t</dl>\n"
+            "\t\t<table>\n"
+            ).arg(platformName).arg(fontFamily).arg(fontPixelSize);
+
+    QString languageName;
+    foreach (const testDataSet &dataSet, testDataSetList()) {
+        if (languageName != dataSet.language) {
+            result.append(QString::fromLatin1(
+                    "\t\t\t<tr>\n"
+                    "\t\t\t\t<th rowspan=\"2\"><h2>%1</h2></th>\n"
+                    "\t\t\t\t<th colspan=\"2\">Qt/%2</th>\n"
+                    "\t\t\t\t<th rowspan=\"2\">Glyphs</th>\n"
+                    "\t\t\t\t<th colspan=\"2\">Browser</th>\n"
+                    "\t\t\t</tr>\n"
+                    "\t\t\t<tr>\n"
+                    "\t\t\t\t<th>In</th>\n"
+                    "\t\t\t\t<th>Out</th>\n"
+                    "\t\t\t\t<th>In</th>\n"
+                    "\t\t\t\t<th>Out</th>\n"
+                    "\t\t\t</tr>\n"
+                    ).arg(dataSet.language).arg(platformName));
+            languageName = dataSet.language;
+        }
+        QString glyphsData;
+        if (!dataSet.inputOriginal.isEmpty())
+            glyphsData.append(dlItem(QLatin1String("I"), dataSet.inputOriginal));
+        if (!dataSet.outputOriginal.isEmpty())
+            glyphsData.append(dlItem(QLatin1String("O-Utf"), dataSet.outputOriginal));
+        if (!dataSet.outputGlyphIDsOriginal.isEmpty())
+            glyphsData.append(dlItem(QLatin1String("O-ID"), dataSet.outputGlyphIDsOriginal));
+        if (!glyphsData.isEmpty()) {
+            glyphsData.prepend(QLatin1String("\t\t\t\t\t<dl>\n"));
+            glyphsData.append(QLatin1String("\t\t\t\t\t</dl>\n"));
+        }
+        result.append(QString::fromLatin1(
+                "\t\t\t<tr>\n"
+                "\t\t\t\t<th>%1</th>\n"
+                "\t\t\t\t%2\n"
+                "\t\t\t\t%3\n"
+                "\t\t\t\t<td>\n"
+                "%4"
+                "\t\t\t\t</td>\n"
+                "\t\t\t\t<td>%5</td>\n"
+                "\t\t\t\t<td>%6</td>\n"
+                "\t\t\t</tr>\n"
+                ).arg(dataSet.name)
+                .arg(dumpImageHtml(dataSet.input, pathName))
+                .arg(dumpImageHtml(dataSet.output, pathName))
+                .arg(glyphsData)
+                .arg(dataSet.input)
+                .arg(dataSet.output)
+        );
+    }
+
+    result.append(QString::fromLatin1(
+            "\t\t</table>\n"
+            "\t</body>\n"
+            "</html>")
+    );
+
+    htmlPage.write(result.toUtf8());
+
+    return true;
+}
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    return dumpHtml(QLatin1String(".")) ? 0 : 1;
+}

tests/manual/textrendering/nativetext/CMakeLists.txt

@@ -0,0 +1,29 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## nativetext Binary:
+#####################################################################
+
+qt_internal_add_manual_test(nativetext
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::CorePrivate
+        Qt::Gui
+        Qt::GuiPrivate
+        Qt::Widgets
+)
+
+## Scopes:
+#####################################################################
+
+qt_internal_extend_target(nativetext CONDITION APPLE
+    LIBRARIES
+        ${FWAppKit}
+        ${FWCoreGraphics}
+        ${FWFoundation}
+    COMPILE_OPTIONS
+        -x
+        objective-c++
+)

tests/manual/textrendering/nativetext/main.cpp

@@ -0,0 +1,295 @@
+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtWidgets>
+
+#ifdef Q_OS_DARWIN
+#include <private/qcoregraphics_p.h>
+#include <private/qcore_mac_p.h>
+#include <Foundation/Foundation.h>
+#include <private/qfont_p.h>
+#include <private/qfontengine_p.h>
+#endif
+
+static int s_mode;
+static QString s_text = QString::fromUtf8("The quick brown \xF0\x9F\xA6\x8A jumps over the lazy \xF0\x9F\x90\xB6");
+
+class TextRenderer : public QWidget
+{
+    Q_OBJECT
+public:
+    enum RenderingMode { QtRendering, NativeRendering };
+    Q_ENUM(RenderingMode);
+
+    TextRenderer(qreal pointSize, const QString &text, const QColor &textColor = QColor(), const QColor &bgColor = QColor())
+        : m_text(text)
+    {
+        if (pointSize) {
+            QFont f = font();
+            f.setPointSize(pointSize);
+            setFont(f);
+        }
+
+        if (textColor.isValid()) {
+            QPalette p = palette();
+            p.setColor(QPalette::Text, textColor);
+            setPalette(p);
+        }
+
+        if (bgColor.isValid()) {
+            QPalette p = palette();
+            p.setColor(QPalette::Window, bgColor);
+            setPalette(p);
+        }
+    }
+
+    QString text() const
+    {
+        return !m_text.isNull() ? m_text : s_text;
+    }
+
+    QSize sizeHint() const override
+    {
+        QFontMetrics fm = fontMetrics();
+        return QSize(fm.boundingRect(text()).width(), fm.height());
+    }
+
+    bool event(QEvent * event) override
+    {
+        if (event->type() == QEvent::ToolTip) {
+            QString toolTip;
+            QDebug debug(&toolTip);
+            debug << "textColor =" << palette().color(QPalette::Text) << "bgColor =" << palette().color(QPalette::Window);
+            setToolTip(toolTip);
+        }
+
+        return QWidget::event(event);
+    }
+
+    void paintEvent(QPaintEvent *) override
+    {
+        QImage image(size() * devicePixelRatio(), QImage::Format_ARGB32_Premultiplied);
+        image.setDevicePixelRatio(devicePixelRatio());
+
+        QPainter p(&image);
+        p.fillRect(QRect(0, 0, image.width(), image.height()), palette().window().color());
+
+        const int ascent = fontMetrics().ascent();
+
+        QPen metricsPen(QColor(112, 216, 255), 1.0);
+        metricsPen.setCosmetic(true);
+        p.setPen(metricsPen);
+        p.drawLine(QPoint(0, ascent), QPoint(width(), ascent));
+        p.end();
+
+        if (s_mode == QtRendering)
+            renderQtText(image);
+        else
+            renderNativeText(image);
+
+        QPainter wp(this);
+        wp.drawImage(QPoint(0, 0), image);
+    }
+
+    void renderQtText(QImage &image)
+    {
+        QPainter p(&image);
+
+        const int ascent = fontMetrics().ascent();
+
+        p.setPen(palette().text().color());
+
+        QFont f = font();
+        f.setResolveMask(-1);
+        p.setFont(f);
+
+        p.drawText(QPoint(0, ascent), text());
+    }
+
+    void renderNativeText(QImage &image)
+    {
+#ifdef Q_OS_DARWIN
+        QMacAutoReleasePool pool;
+        QMacCGContext ctx(&image);
+
+        const auto *fontEngine = QFontPrivate::get(font())->engineForScript(QChar::Script_Common);
+        Q_ASSERT(fontEngine);
+        if (fontEngine->type() == QFontEngine::Multi) {
+            fontEngine = static_cast<const QFontEngineMulti *>(fontEngine)->engine(0);
+            Q_ASSERT(fontEngine);
+        }
+        Q_ASSERT(fontEngine->type() == QFontEngine::Mac);
+
+        QColor textColor = palette().text().color();
+        auto nsColor = [NSColor colorWithSRGBRed:textColor.redF()
+            green:textColor.greenF()
+            blue:textColor.blueF()
+            alpha:textColor.alphaF()];
+
+        if (font().styleStrategy() & QFont::NoAntialias)
+            CGContextSetShouldAntialias(ctx, false);
+
+        // Flip to what CT expects
+        CGContextScaleCTM(ctx, 1, -1);
+        CGContextTranslateCTM(ctx, 0, -height());
+
+        // Set up baseline
+        CGContextSetTextPosition(ctx, 0, height() - fontMetrics().ascent());
+
+        auto *attributedString = [[NSAttributedString alloc] initWithString:text().toNSString()
+            attributes:@{
+                NSFontAttributeName : (NSFont *)fontEngine->handle(),
+                NSForegroundColorAttributeName : nsColor
+            }
+        ];
+
+        QCFType<CTLineRef> line = CTLineCreateWithAttributedString(CFAttributedStringRef([attributedString autorelease]));
+        CTLineDraw(line, ctx);
+#endif
+    }
+
+public:
+
+    RenderingMode m_mode = QtRendering;
+    QString m_text;
+};
+
+class TestWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    TestWidget()
+    {
+        auto *mainLayout = new QVBoxLayout;
+
+        m_previews = new QWidget;
+        m_previews->setLayout(new QHBoxLayout);
+
+        for (int i = 0; i < 6; ++i) {
+            auto *layout = new QVBoxLayout;
+            QString text;
+            if (i > 0)
+                text = "ABC";
+
+            QPair<QColor, QColor> color = [i] {
+                switch (i) {
+                case 0: return qMakePair(QColor(), QColor());
+                case 1: return qMakePair(QColor(Qt::black), QColor(Qt::white));
+                case 2: return qMakePair(QColor(Qt::white), QColor(Qt::black));
+                case 3: return qMakePair(QColor(Qt::magenta), QColor(Qt::green));
+                case 4: return qMakePair(QColor(0, 0, 0, 128), QColor(Qt::white));
+                case 5: return qMakePair(QColor(255, 255, 255, 128), QColor(Qt::black));
+                default: return qMakePair(QColor(), QColor());
+                }
+            }();
+
+            for (int pointSize : {8, 12, 24, 36, 48})
+                layout->addWidget(new TextRenderer(pointSize, text, color.first, color.second));
+
+            static_cast<QHBoxLayout*>(m_previews->layout())->addLayout(layout);
+        }
+
+        mainLayout->addWidget(m_previews);
+
+        auto *controls = new QHBoxLayout;
+        auto *lineEdit = new QLineEdit(s_text);
+        connect(lineEdit, &QLineEdit::textChanged, [&](const QString &text) {
+            s_text = text;
+            for (TextRenderer *renderer : m_previews->findChildren<TextRenderer *>())
+                renderer->updateGeometry();
+        });
+        controls->addWidget(lineEdit);
+
+        auto *colorButton = new QPushButton("Color...");
+        connect(colorButton, &QPushButton::clicked, [&] {
+            auto *colorDialog = new QColorDialog(this);
+            colorDialog->setOptions(QColorDialog::NoButtons | QColorDialog::ShowAlphaChannel);
+            colorDialog->setModal(false);
+            connect(colorDialog, &QColorDialog::currentColorChanged, [&](const QColor &color) {
+                QPalette p = palette();
+                p.setColor(QPalette::Text, color);
+                setPalette(p);
+            });
+            colorDialog->setCurrentColor(palette().text().color());
+            colorDialog->setVisible(true);
+        });
+        controls->addWidget(colorButton);
+        auto *fontButton = new QPushButton("Font...");
+        connect(fontButton, &QPushButton::clicked, [&] {
+            auto *fontDialog = new QFontDialog(this);
+            fontDialog->setOptions(QFontDialog::NoButtons);
+            fontDialog->setModal(false);
+            fontDialog->setCurrentFont(m_previews->font());
+            connect(fontDialog, &QFontDialog::currentFontChanged, [&](const QFont &font) {
+                m_previews->setFont(font);
+            });
+            fontDialog->setVisible(true);
+        });
+        controls->addWidget(fontButton);
+
+        auto *aaButton = new QCheckBox("NoAntialias");
+        connect(aaButton, &QCheckBox::stateChanged, [&] {
+            for (TextRenderer *renderer : m_previews->findChildren<TextRenderer *>()) {
+                QFont font = renderer->font();
+                font.setStyleStrategy(QFont::StyleStrategy(font.styleStrategy() ^ QFont::NoAntialias));
+                renderer->setFont(font);
+            }
+        });
+        controls->addWidget(aaButton);
+
+        auto *subpixelAAButton = new QCheckBox("NoSubpixelAntialias");
+        connect(subpixelAAButton, &QCheckBox::stateChanged, [&] {
+            for (TextRenderer *renderer : m_previews->findChildren<TextRenderer *>()) {
+                QFont font = renderer->font();
+                font.setStyleStrategy(QFont::StyleStrategy(font.styleStrategy() ^ QFont::NoSubpixelAntialias));
+                renderer->setFont(font);
+            }
+        });
+        controls->addWidget(subpixelAAButton);
+        controls->addStretch();
+
+        mainLayout->addLayout(controls);
+
+        mainLayout->setSizeConstraint(QLayout::SetFixedSize);
+        setLayout(mainLayout);
+
+        setMode(TextRenderer::QtRendering);
+        setFocusPolicy(Qt::StrongFocus);
+        setFocus();
+    }
+
+    void setMode(TextRenderer::RenderingMode mode)
+    {
+        s_mode = mode;
+        setWindowTitle(s_mode == TextRenderer::QtRendering ? "Qt" : "Native");
+
+        for (TextRenderer *renderer : m_previews->findChildren<TextRenderer *>())
+            renderer->update();
+    }
+
+    void mousePressEvent(QMouseEvent *) override
+    {
+        setMode(TextRenderer::RenderingMode(!s_mode));
+    }
+
+    void keyPressEvent(QKeyEvent *e) override
+    {
+        if (e->key() == Qt::Key_Space)
+            setMode(TextRenderer::RenderingMode(!s_mode));
+    }
+
+    QWidget *m_previews;
+};
+
+int main(int argc, char **argv)
+{
+    qputenv("QT_MAX_CACHED_GLYPH_SIZE", "97");
+    QApplication app(argc, argv);
+
+    TestWidget widget;
+    widget.show();
+    return app.exec();
+}
+
+#include "main.moc"
+

tests/manual/textrendering/nativetext/nativetext.pro

@@ -0,0 +1,7 @@
+QT += widgets core-private gui-private
+SOURCES += main.cpp
+CONFIG -= app_bundle
+darwin {
+    QMAKE_CXXFLAGS += -x objective-c++
+    LIBS += -framework Foundation -framework CoreGraphics -framework AppKit
+}

tests/manual/textrendering/textperformance/CMakeLists.txt

@@ -0,0 +1,15 @@
+# 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

@@ -0,0 +1,195 @@
+// 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

@@ -0,0 +1,2 @@
+QT += widgets
+SOURCES = main.cpp

tests/manual/textrendering/textrendering.pro

@@ -0,0 +1,5 @@
+TEMPLATE=subdirs
+
+SUBDIRS = glyphshaping \
+    textperformance \
+    nativetext