Vendor things

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/README.md

@@ -0,0 +1,33 @@
+# font-view
+
+A simple tool to preview all glyphs in the font using `ttf-parser`, `freetype` and `harfbuzz`.
+
+## Build
+
+```sh
+# build ttf-parser C API first
+cargo build --release --manifest-path ../../c-api/Cargo.toml
+
+# build only with ttf-parser support
+qmake
+make
+
+# or build with freetype support
+qmake DEFINES+=WITH_FREETYPE
+make
+
+# or build with harfbuzz support
+# note that harfbuzz should be built from sources using meson,
+# because we're using an unstable API
+#
+# build harfbuzz first
+meson builddir -Dexperimental_api=true --buildtype release
+ninja -C builddir
+# build font-view
+qmake DEFINES+=WITH_HARFBUZZ HARFBUZZ_SRC=/path/to/harfbuzz-master/
+make
+
+# or with all
+qmake DEFINES+=WITH_FREETYPE DEFINES+=WITH_HARFBUZZ HARFBUZZ_SRC=/path/to/harfbuzz-master/
+make
+```

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/font-view.pro

@@ -0,0 +1,50 @@
+QT       += widgets
+
+CONFIG += c++14
+
+CONFIG(release, debug|release): LIBS += -L$$PWD/../../c-api/target/release/ -lttfparser
+else:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../c-api/target/debug/ -lttfparser
+
+INCLUDEPATH += $$PWD/../../c-api
+DEPENDPATH += $$PWD/../../c-api
+
+SOURCES += \
+    glyphsview.cpp \
+    main.cpp \
+    mainwindow.cpp \
+    ttfparserfont.cpp
+
+HEADERS += \
+    glyph.h \
+    glyphsview.h \
+    mainwindow.h \
+    ttfparserfont.h
+
+FORMS += \
+    mainwindow.ui
+
+macx {
+    QT_CONFIG -= no-pkg-config
+    PKG_CONFIG = /opt/homebrew/bin/pkg-config
+}
+
+# qmake DEFINES+=WITH_FREETYPE
+contains(DEFINES, WITH_FREETYPE) {
+    SOURCES += freetypefont.cpp
+    HEADERS += freetypefont.h
+
+    CONFIG += link_pkgconfig
+    PKGCONFIG += freetype2
+}
+
+# qmake DEFINES+=WITH_HARFBUZZ HARFBUZZ_SRC=/path/to/harfbuzz-master/
+contains(DEFINES, WITH_HARFBUZZ) {
+    DEFINES += HB_EXPERIMENTAL_API
+
+    SOURCES += harfbuzzfont.cpp
+    HEADERS += harfbuzzfont.h
+
+    # harfbuzz should be built with meson
+    LIBS += -L$$HARFBUZZ_SRC/builddir/src/ -lharfbuzz
+    INCLUDEPATH += $$HARFBUZZ_SRC/src
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/freetypefont.cpp

@@ -0,0 +1,175 @@
+// Based on https://www.freetype.org/freetype2/docs/tutorial/example5.cpp
+
+#include <QDebug>
+
+#include "freetypefont.h"
+
+const FT_Fixed MULTIPLIER_FT = 65536L;
+
+const char* getErrorMessage(FT_Error err)
+{
+    #undef __FTERRORS_H__
+    #define FT_ERRORDEF( e, v, s )  case e: return s;
+    #define FT_ERROR_START_LIST     switch (err) {
+    #define FT_ERROR_END_LIST       }
+    #include FT_ERRORS_H
+    return "(Unknown error)";
+}
+
+struct Outliner
+{
+    static int moveToFn(const FT_Vector *to, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.moveTo(to->x, to->y);
+        return 0;
+    }
+
+    static int lineToFn(const FT_Vector *to, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.lineTo(to->x, to->y);
+        return 0;
+    }
+
+    static int quadToFn(const FT_Vector *control, const FT_Vector *to, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.quadTo(control->x, control->y, to->x, to->y);
+        return 0;
+    }
+
+    static int cubicToFn(const FT_Vector *controlOne,
+                         const FT_Vector *controlTwo,
+                         const FT_Vector *to,
+                         void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.cubicTo(controlOne->x, controlOne->y, controlTwo->x, controlTwo->y, to->x, to->y);
+        return 0;
+    }
+
+    QPainterPath path;
+};
+
+FreeTypeFont::FreeTypeFont()
+{
+    const auto error = FT_Init_FreeType(&m_ftLibrary);
+    if (error) {
+        throw tr("Failed to init FreeType.\n%1").arg(getErrorMessage(error));
+    }
+}
+
+FreeTypeFont::~FreeTypeFont()
+{
+    if (m_ftFace) {
+        FT_Done_Face(m_ftFace);
+    }
+
+    FT_Done_FreeType(m_ftLibrary);
+}
+
+void FreeTypeFont::open(const QString &path, const quint32 index)
+{
+    if (isOpen()) {
+        FT_Done_Face(m_ftFace);
+        m_ftFace = nullptr;
+    }
+
+    const auto utf8Path = path.toUtf8();
+    const auto error = FT_New_Face(m_ftLibrary, utf8Path.constData(), index, &m_ftFace);
+    if (error) {
+        throw tr("Failed to open a font.\n%1").arg(getErrorMessage(error));
+    }
+}
+
+bool FreeTypeFont::isOpen() const
+{
+    return m_ftFace != nullptr;
+}
+
+FontInfo FreeTypeFont::fontInfo() const
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    return FontInfo {
+        m_ftFace->ascender,
+        m_ftFace->height,
+        (quint16)m_ftFace->num_glyphs, // TrueType allows only u16.
+    };
+}
+
+Glyph FreeTypeFont::outline(const quint16 gid) const
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    auto error = FT_Load_Glyph(m_ftFace, gid, FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP);
+    if (error) {
+        throw tr("Failed to load a glyph.\n%1").arg(getErrorMessage(error));
+    }
+
+    Outliner outliner;
+
+    FT_Outline_Funcs funcs;
+    funcs.move_to = outliner.moveToFn;
+    funcs.line_to = outliner.lineToFn;
+    funcs.conic_to = outliner.quadToFn;
+    funcs.cubic_to = outliner.cubicToFn;
+    funcs.shift = 0;
+    funcs.delta = 0;
+
+    auto slot = m_ftFace->glyph;
+    auto &outline = slot->outline;
+
+    // Flip outline around x-axis.
+    FT_Matrix matrix;
+    matrix.xx = 1L * MULTIPLIER_FT;
+    matrix.xy = 0L * MULTIPLIER_FT;
+    matrix.yx = 0L * MULTIPLIER_FT;
+    matrix.yy = -1L * MULTIPLIER_FT;
+    FT_Outline_Transform(&outline, &matrix);
+
+    FT_BBox bboxFt;
+    FT_Outline_Get_BBox(&outline, &bboxFt);
+
+    const QRect bbox(
+        (int)bboxFt.xMin,
+        (int)bboxFt.yMin,
+        (int)bboxFt.xMax - (int)bboxFt.xMin,
+        (int)bboxFt.yMax - (int)bboxFt.yMin
+    );
+
+    error = FT_Outline_Decompose(&outline, &funcs, &outliner);
+    if (error) {
+        throw tr("Failed to outline a glyph.\n%1").arg(getErrorMessage(error));
+    }
+
+    outliner.path.setFillRule(Qt::WindingFill);
+
+    return Glyph {
+        outliner.path,
+        bbox,
+    };
+}
+
+void FreeTypeFont::setVariations(const QVector<Variation> &variations)
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    QVector<FT_Fixed> ftCoords;
+
+    for (const auto &var : variations) {
+        ftCoords << var.value * MULTIPLIER_FT;
+    }
+
+    const auto error = FT_Set_Var_Design_Coordinates(m_ftFace, ftCoords.size(), ftCoords.data());
+    if (error) {
+        throw tr("Failed to set variation.\n%1").arg(getErrorMessage(error));
+    }
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/freetypefont.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_OUTLINE_H
+#include FT_BBOX_H
+#include FT_MULTIPLE_MASTERS_H
+
+#include <QCoreApplication>
+
+#include "glyph.h"
+
+class FreeTypeFont
+{
+    Q_DECLARE_TR_FUNCTIONS(FreeTypeFont)
+
+public:
+    FreeTypeFont();
+    ~FreeTypeFont();
+
+    void open(const QString &path, const quint32 index = 0);
+    bool isOpen() const;
+
+    FontInfo fontInfo() const;
+    Glyph outline(const quint16 gid) const;
+
+    void setVariations(const QVector<Variation> &variations);
+
+private:
+    FT_Library m_ftLibrary = nullptr;
+    FT_Face m_ftFace = nullptr;
+};

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/glyph.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <QPainterPath>
+
+struct Tag
+{
+    Tag(quint32 v) : value(v) {}
+
+    QString toString() const
+    {
+        QString s;
+        s.append(QChar(value >> 24 & 0xff));
+        s.append(QChar(value >> 16 & 0xff));
+        s.append(QChar(value >> 8 & 0xff));
+        s.append(QChar(value >> 0 & 0xff));
+        return s;
+    }
+
+    quint32 value;
+};
+
+struct FontInfo
+{
+    qint16 ascender = 0;
+    qint16 height = 1000;
+    quint16 numberOfGlyphs = 0;
+};
+
+struct Glyph
+{
+    QPainterPath outline;
+    QRect bbox;
+};
+
+struct VariationInfo
+{
+    QString name;
+    Tag tag;
+    qint16 min = 0;
+    qint16 def = 0;
+    qint16 max = 0;
+};
+
+struct Variation
+{
+    Tag tag;
+    int value;
+};

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/glyphsview.cpp

@@ -0,0 +1,286 @@
+#include <QDebug>
+#include <QMouseEvent>
+#include <QPainter>
+#include <QScrollBar>
+
+#include <cmath>
+
+#include "glyphsview.h"
+
+static const int COLUMNS_COUNT = 100;
+
+GlyphsView::GlyphsView(QWidget *parent) : QAbstractScrollArea(parent)
+{
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+}
+
+void GlyphsView::setFontInfo(const FontInfo &fi)
+{
+    m_fontInfo = fi;
+    m_glyphs.resize(fi.numberOfGlyphs);
+#ifdef WITH_FREETYPE
+    m_ftGlyphs.resize(fi.numberOfGlyphs);
+#endif
+#ifdef WITH_HARFBUZZ
+    m_hbGlyphs.resize(fi.numberOfGlyphs);
+#endif
+
+    m_indexes.clear();
+    for (int i = 0; i < fi.numberOfGlyphs; ++i) {
+        QStaticText text(QString::number(i));
+        text.prepare();
+        m_indexes << text;
+    }
+
+    updateScrollBars();
+    horizontalScrollBar()->setValue(0);
+    verticalScrollBar()->setValue(0);
+}
+
+void GlyphsView::setGlyph(int idx, const Glyph &glyph)
+{
+    m_glyphs.replace(idx, glyph);
+}
+
+#ifdef WITH_FREETYPE
+void GlyphsView::setFTGlyph(int idx, const Glyph &glyph)
+{
+    m_ftGlyphs.replace(idx, glyph);
+}
+#endif
+
+#ifdef WITH_HARFBUZZ
+void GlyphsView::setHBGlyph(int idx, const Glyph &glyph)
+{
+    m_hbGlyphs.replace(idx, glyph);
+}
+#endif
+
+void GlyphsView::setDrawBboxes(const bool flag)
+{
+    m_drawBboxes = flag;
+    viewport()->update();
+}
+
+void GlyphsView::setDrawGlyphs(const bool flag)
+{
+    m_drawGlyphs = flag;
+    viewport()->update();
+}
+
+void GlyphsView::setDrawFTGlyphs(const bool flag)
+{
+    m_drawFTGlyphs = flag;
+    viewport()->update();
+}
+
+void GlyphsView::setDrawHBGlyphs(const bool flag)
+{
+    m_drawHBGlyphs = flag;
+    viewport()->update();
+}
+
+void GlyphsView::paintEvent(QPaintEvent *)
+{
+    QPainter p(viewport());
+    p.translate(-horizontalScrollBar()->value(), -verticalScrollBar()->value());
+
+    const double cellHeight = m_fontInfo.height * m_scale;
+    drawGrid(p, cellHeight);
+
+    p.setRenderHint(QPainter::Antialiasing);
+
+    {
+        auto font = p.font();
+        font.setPointSize(10);
+        p.setFont(font);
+    }
+
+    int x = 0;
+    int y = m_fontInfo.ascender;
+    int num_y = m_fontInfo.height;
+    for (int i = 0; i < m_glyphs.size(); ++i) {
+        // Text rendering is the slowest part, so we are using preprocessed text.
+        p.setPen(palette().color(QPalette::Text));
+        p.drawStaticText(
+            qRound(x * m_scale + 1),
+            qRound(num_y * m_scale - p.fontMetrics().ascent() - 2),
+            m_indexes.at(i)
+        );
+
+        if (m_drawGlyphs) {
+            p.save();
+
+            const int dx = qRound((m_fontInfo.height - m_glyphs.at(i).bbox.width()) / 2.0)
+                - m_glyphs.at(i).bbox.x();
+
+            p.scale(m_scale, m_scale);
+            p.translate(x + dx, y);
+
+            if (m_drawBboxes) {
+                p.setPen(QPen(Qt::darkGreen, 0.5 / m_scale));
+                p.setBrush(Qt::NoBrush);
+                p.drawRect(m_glyphs.at(i).bbox);
+            }
+
+            p.setPen(Qt::NoPen);
+            p.setPen(Qt::NoPen);
+            if (m_drawFTGlyphs || m_drawHBGlyphs) {
+                p.setBrush(Qt::red);
+            } else {
+                p.setBrush(palette().color(QPalette::Text));
+            }
+
+            p.drawPath(m_glyphs.at(i).outline);
+
+            p.restore();
+        }
+
+#ifdef WITH_HARFBUZZ
+        if (m_drawHBGlyphs) {
+            p.save();
+
+            const int dx = qRound((m_fontInfo.height - m_hbGlyphs.at(i).bbox.width()) / 2.0)
+                - m_hbGlyphs.at(i).bbox.x();
+
+            p.scale(m_scale, m_scale);
+            p.translate(x + dx, y);
+
+            if (m_drawBboxes) {
+                p.setPen(QPen(Qt::darkGreen, 0.5 / m_scale));
+                p.setBrush(Qt::NoBrush);
+                p.drawRect(m_hbGlyphs.at(i).bbox);
+            }
+
+            p.setPen(Qt::NoPen);
+            if (m_drawFTGlyphs) {
+                p.setBrush(Qt::blue);
+            } else {
+                p.setBrush(palette().color(QPalette::Text));
+            }
+
+            p.drawPath(m_hbGlyphs.at(i).outline);
+
+            p.restore();
+        }
+#endif
+
+#ifdef WITH_FREETYPE
+        if (m_drawFTGlyphs) {
+            p.save();
+
+            const int dx = qRound((m_fontInfo.height - m_ftGlyphs.at(i).bbox.width()) / 2.0)
+                - m_ftGlyphs.at(i).bbox.x();
+
+            p.scale(m_scale, m_scale);
+            p.translate(x + dx, y);
+
+            if (m_drawBboxes) {
+                p.setPen(QPen(Qt::darkGreen, 0.5 / m_scale));
+                p.setBrush(Qt::NoBrush);
+                p.drawRect(m_ftGlyphs.at(i).bbox);
+            }
+
+            p.setPen(Qt::NoPen);
+            p.setBrush(palette().color(QPalette::Text));
+
+            if (m_drawGlyphs || m_drawHBGlyphs) {
+                p.setBrush(palette().color(QPalette::Base));
+            }
+
+            p.drawPath(m_ftGlyphs.at(i).outline);
+
+            p.restore();
+        }
+#endif
+
+        x += m_fontInfo.height;
+        if (i > 0 && (i + 1) % COLUMNS_COUNT == 0) {
+            x = 0;
+            y += m_fontInfo.height;
+            num_y += m_fontInfo.height;
+        }
+    }
+}
+
+void GlyphsView::drawGrid(QPainter &p, const double cellHeight)
+{
+    p.setRenderHint(QPainter::Antialiasing, false);
+    p.setPen(QPen(palette().color(QPalette::Text), 0.25));
+    p.setBrush(Qt::NoBrush);
+
+    const int rows = qRound(floor(m_glyphs.size() / COLUMNS_COUNT)) + 1;
+    const auto maxH = qMin(rows * cellHeight, (double)horizontalScrollBar()->maximum());
+
+    double x = cellHeight;
+    for (int c = 1; c < COLUMNS_COUNT; ++c) {
+        p.drawLine(QLineF(x, 0, x, maxH));
+        x += cellHeight;
+    }
+
+    double y = cellHeight;
+    for (int r = 1; r <= rows; ++r) {
+        p.drawLine(QLineF(0, y, horizontalScrollBar()->maximum() + viewport()->width(), y));
+        y += cellHeight;
+    }
+}
+
+void GlyphsView::mousePressEvent(QMouseEvent *e)
+{
+    if (e->button() & Qt::LeftButton) {
+        m_mousePressPos = e->pos();
+        m_origOffset = QPoint(horizontalScrollBar()->value(), verticalScrollBar()->value());
+    }
+}
+
+void GlyphsView::mouseMoveEvent(QMouseEvent *e)
+{
+    if (m_mousePressPos.isNull()) {
+        return;
+    }
+
+    const auto diff = m_mousePressPos - e->pos();
+    horizontalScrollBar()->setValue(m_origOffset.x() + diff.x());
+    verticalScrollBar()->setValue(m_origOffset.y() + diff.y());
+}
+
+void GlyphsView::mouseReleaseEvent(QMouseEvent *)
+{
+    m_mousePressPos = QPoint();
+    m_origOffset = QPoint();
+}
+
+void GlyphsView::wheelEvent(QWheelEvent *e)
+{
+    e->accept();
+
+    if (e->angleDelta().y() > 0) {
+        m_scale += 0.01;
+    } else {
+        m_scale -= 0.01;
+    }
+
+    m_scale = qBound(0.03, m_scale, 1.0);
+
+    updateScrollBars();
+    viewport()->update();
+}
+
+void GlyphsView::resizeEvent(QResizeEvent *e)
+{
+    QAbstractScrollArea::resizeEvent(e);
+    updateScrollBars();
+}
+
+void GlyphsView::updateScrollBars()
+{
+    const double cellHeight = m_fontInfo.height * m_scale;
+    const int rows = qRound(floor(m_glyphs.size() / COLUMNS_COUNT)) + 1;
+    const auto w = COLUMNS_COUNT * cellHeight - viewport()->width();
+    const auto h = rows * cellHeight - viewport()->height();
+    horizontalScrollBar()->setMinimum(0);
+    verticalScrollBar()->setMinimum(0);
+    horizontalScrollBar()->setMaximum(qMax(0, qRound(w)));
+    verticalScrollBar()->setMaximum(qMax(0, qRound(h)));
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/glyphsview.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <QAbstractScrollArea>
+#include <QStaticText>
+
+#include "glyph.h"
+
+class GlyphsView : public QAbstractScrollArea
+{
+    Q_OBJECT
+
+public:
+    explicit GlyphsView(QWidget *parent = nullptr);
+
+    void setFontInfo(const FontInfo &fi);
+    void setGlyph(int idx, const Glyph &glyph);
+#ifdef WITH_FREETYPE
+    void setFTGlyph(int idx, const Glyph &glyph);
+#endif
+#ifdef WITH_HARFBUZZ
+    void setHBGlyph(int idx, const Glyph &glyph);
+#endif
+
+    void setDrawBboxes(const bool flag);
+    void setDrawGlyphs(const bool flag);
+    void setDrawFTGlyphs(const bool flag);
+    void setDrawHBGlyphs(const bool flag);
+
+private:
+    void paintEvent(QPaintEvent *);
+    void drawGrid(QPainter &p, const double cellHeight);
+
+    void mousePressEvent(QMouseEvent *e);
+    void mouseMoveEvent(QMouseEvent *e);
+    void mouseReleaseEvent(QMouseEvent *e);
+    void wheelEvent(QWheelEvent *e);
+
+    void resizeEvent(QResizeEvent *);
+
+    void updateScrollBars();
+
+private:
+    QPoint m_mousePressPos;
+    QPoint m_origOffset;
+
+    double m_scale = 0.05;
+    bool m_drawBboxes = true;
+    bool m_drawGlyphs = true;
+    bool m_drawFTGlyphs = false;
+    bool m_drawHBGlyphs = false;
+
+    FontInfo m_fontInfo;
+    QVector<Glyph> m_glyphs;
+#ifdef WITH_FREETYPE
+    QVector<Glyph> m_ftGlyphs;
+#endif
+#ifdef WITH_HARFBUZZ
+    QVector<Glyph> m_hbGlyphs;
+#endif
+    QVector<QStaticText> m_indexes;
+};

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/harfbuzzfont.cpp

@@ -0,0 +1,160 @@
+#include <QTransform>
+#include <QDebug>
+
+#include <hb.h>
+
+#include "harfbuzzfont.h"
+
+struct Outliner
+{
+    static void moveToFn(hb_position_t to_x, hb_position_t to_y, Outliner &outliner)
+    {
+        outliner.path.moveTo(to_x, to_y);
+    }
+
+    static void lineToFn(hb_position_t to_x, hb_position_t to_y, Outliner &outliner)
+    {
+        outliner.path.lineTo(to_x, to_y);
+    }
+
+    static void quadToFn(hb_position_t control_x, hb_position_t control_y,
+                         hb_position_t to_x, hb_position_t to_y,
+                         Outliner &outliner)
+    {
+        outliner.path.quadTo(control_x, control_y, to_x, to_y);
+    }
+
+    static void cubicToFn(hb_position_t control1_x, hb_position_t control1_y,
+                          hb_position_t control2_x, hb_position_t control2_y,
+                          hb_position_t to_x, hb_position_t to_y,
+                          Outliner &outliner)
+    {
+        outliner.path.cubicTo(control1_x, control1_y, control2_x, control2_y, to_x, to_y);
+    }
+
+    static void closePathFn(Outliner &outliner)
+    {
+        outliner.path.closeSubpath();
+    }
+
+    QPainterPath path;
+};
+
+HarfBuzzFont::HarfBuzzFont()
+{
+
+}
+
+HarfBuzzFont::~HarfBuzzFont()
+{
+    reset();
+}
+
+void HarfBuzzFont::open(const QString &path, const quint32 index)
+{
+    if (isOpen()) {
+        reset();
+    }
+
+    const auto utf8Path = path.toUtf8();
+    hb_blob_t *blob = hb_blob_create_from_file(utf8Path.constData());
+    if (!blob) {
+        throw tr("Failed to open a font.");
+    }
+
+    hb_face_t *face = hb_face_create(blob, index);
+    if (!face) {
+        throw tr("Failed to open a font.");
+    }
+
+    hb_font_t *font = hb_font_create(face);
+    if (!font) {
+        throw tr("Failed to open a font.");
+    }
+
+    m_blob = blob;
+    m_face = face;
+    m_font = font;
+}
+
+bool HarfBuzzFont::isOpen() const
+{
+    return m_font != nullptr;
+}
+
+Glyph HarfBuzzFont::outline(const quint16 gid) const
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    Outliner outliner;
+
+    hb_draw_funcs_t *funcs = hb_draw_funcs_create();
+    hb_draw_funcs_set_move_to_func(funcs, (hb_draw_move_to_func_t)outliner.moveToFn);
+    hb_draw_funcs_set_line_to_func(funcs, (hb_draw_line_to_func_t)outliner.lineToFn);
+    hb_draw_funcs_set_quadratic_to_func(funcs, (hb_draw_quadratic_to_func_t)outliner.quadToFn);
+    hb_draw_funcs_set_cubic_to_func(funcs, (hb_draw_cubic_to_func_t)outliner.cubicToFn);
+    hb_draw_funcs_set_close_path_func(funcs, (hb_draw_close_path_func_t)outliner.closePathFn);
+
+    if (!hb_font_draw_glyph(m_font, gid, funcs, &outliner)) {
+        throw tr("Failed to outline a glyph %1.").arg(gid);
+    }
+
+    hb_draw_funcs_destroy(funcs);
+
+    hb_glyph_extents_t extents = {0, 0, 0, 0};
+    if (!hb_font_get_glyph_extents(m_font, gid, &extents)) {
+        throw tr("Failed to query glyph extents.");
+    }
+
+    const QRect bbox(
+        extents.x_bearing,
+        -extents.y_bearing,
+        extents.width,
+        -extents.height
+    );
+
+    // Flip outline around x-axis.
+    QTransform ts(1, 0, 0, -1, 0, 0);
+    outliner.path = ts.map(outliner.path);
+
+    outliner.path.setFillRule(Qt::WindingFill);
+
+    return Glyph {
+        outliner.path,
+        bbox,
+    };
+}
+
+void HarfBuzzFont::setVariations(const QVector<Variation> &variations)
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    QVector<hb_variation_t> hbVariations;
+    for (const auto &var : variations) {
+        hbVariations.append({ var.tag.value, (float)var.value });
+    }
+
+    hb_font_set_variations(m_font, hbVariations.constData(), hbVariations.size());
+}
+
+void HarfBuzzFont::reset()
+{
+    if (m_blob) {
+        hb_blob_destroy(m_blob);
+        m_blob = nullptr;
+    }
+
+    if (m_font) {
+        hb_font_destroy(m_font);
+        m_font = nullptr;
+    }
+
+    if (m_face) {
+        hb_face_destroy(m_face);
+        m_face = nullptr;
+    }
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/harfbuzzfont.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <QCoreApplication>
+
+#include "glyph.h"
+
+struct hb_blob_t;
+struct hb_face_t;
+struct hb_font_t;
+struct hb_draw_funcs_t;
+
+class HarfBuzzFont
+{
+    Q_DECLARE_TR_FUNCTIONS(HarfBuzzFont)
+
+public:
+    HarfBuzzFont();
+    ~HarfBuzzFont();
+
+    void open(const QString &path, const quint32 index = 0);
+    bool isOpen() const;
+
+    Glyph outline(const quint16 gid) const;
+
+    void setVariations(const QVector<Variation> &variations);
+
+private:
+    void reset();
+
+private:
+    hb_blob_t *m_blob = nullptr;
+    hb_face_t *m_face = nullptr;
+    hb_font_t *m_font = nullptr;
+};

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/main.cpp

@@ -0,0 +1,13 @@
+#include <QApplication>
+
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/mainwindow.cpp

@@ -0,0 +1,162 @@
+#include <QElapsedTimer>
+#include <QSlider>
+#include <QTimer>
+#include <QMessageBox>
+#include <QDebug>
+
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+
+#ifndef WITH_FREETYPE
+    ui->chBoxDrawFreeType->hide();
+#endif
+
+#ifndef WITH_HARFBUZZ
+    ui->chBoxDrawHarfBuzz->hide();
+#endif
+
+    if (qApp->arguments().size() == 2) {
+        QTimer::singleShot(1, this, [this](){
+            loadFont(qApp->arguments().at(1));
+        });
+    }
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::loadFont(const QString &path)
+{
+    try {
+        m_ttfpFont.open(path);
+
+        const auto variations = m_ttfpFont.loadVariations();
+        if (!variations.isEmpty()) {
+            ui->widgetVariations->show();
+
+            // Clear layout.
+            while (ui->layVariations->count()) {
+                delete ui->layVariations->takeAt(0);
+            }
+
+            m_variationSliders.clear();
+
+            QVector<Variation> newVariations;
+
+            for (const auto &var : variations) {
+                auto hlay = new QHBoxLayout();
+                hlay->setContentsMargins(0, 0, 0, 0);
+                hlay->addWidget(new QLabel(var.name));
+
+                auto slider = new QSlider(Qt::Horizontal);
+                slider->setMinimum(var.min);
+                slider->setMaximum(var.max);
+                slider->setValue(var.def);
+                hlay->addWidget(slider);
+                ui->layVariations->addLayout(hlay);
+
+                m_variationSliders.append({ slider, var.tag });
+
+                connect(slider, &QSlider::valueChanged, this, &MainWindow::onVariationChanged);
+
+                newVariations.append({ var.tag, var.def });
+            }
+
+            m_ttfpFont.setVariations(newVariations);
+        } else {
+            ui->widgetVariations->hide();
+        }
+
+#ifdef WITH_FREETYPE
+        m_ftFont.open(path);
+#endif
+
+#ifdef WITH_HARFBUZZ
+        m_hbFont.open(path);
+#endif
+
+        ui->glyphsView->setFontInfo(m_ttfpFont.fontInfo());
+        reloadGlyphs();
+    } catch (const QString &err) {
+        QMessageBox::warning(this, tr("Error"), err);
+    }
+}
+
+void MainWindow::reloadGlyphs()
+{
+    const auto fi = m_ttfpFont.fontInfo();
+    for (quint16 i = 0; i < fi.numberOfGlyphs; ++i) {
+        try {
+            ui->glyphsView->setGlyph(i, m_ttfpFont.outline(i));
+        } catch (...) {
+        }
+
+#ifdef WITH_FREETYPE
+        try {
+            ui->glyphsView->setFTGlyph(i, m_ftFont.outline(i));
+        } catch (...) {
+        }
+#endif
+
+#ifdef WITH_HARFBUZZ
+        try {
+            ui->glyphsView->setHBGlyph(i, m_hbFont.outline(i));
+        } catch (...) {
+        }
+#endif
+    }
+
+    ui->glyphsView->viewport()->update();
+}
+
+void MainWindow::onVariationChanged()
+{
+    try {
+        QVector<Variation> variations;
+
+        for (auto var : m_variationSliders) {
+            variations.append({ var.tag, var.slider->value() });
+        }
+
+#ifdef WITH_FREETYPE
+        m_ftFont.setVariations(variations);
+#endif
+
+#ifdef WITH_HARFBUZZ
+        m_hbFont.setVariations(variations);
+#endif
+        m_ttfpFont.setVariations(variations);
+
+        reloadGlyphs();
+    } catch (const QString &err) {
+        QMessageBox::warning(this, tr("Error"), err);
+    }
+}
+
+void MainWindow::on_chBoxDrawBboxes_stateChanged(int flag)
+{
+    ui->glyphsView->setDrawBboxes(flag);
+}
+
+void MainWindow::on_chBoxDrawTtfParser_stateChanged(int flag)
+{
+    ui->glyphsView->setDrawGlyphs(flag);
+}
+
+void MainWindow::on_chBoxDrawFreeType_stateChanged(int flag)
+{
+    ui->glyphsView->setDrawFTGlyphs(flag);
+}
+
+void MainWindow::on_chBoxDrawHarfBuzz_stateChanged(int flag)
+{
+    ui->glyphsView->setDrawHBGlyphs(flag);
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/mainwindow.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <QMainWindow>
+
+#ifdef WITH_FREETYPE
+#include "freetypefont.h"
+#endif
+
+#ifdef WITH_FREETYPE
+#include "harfbuzzfont.h"
+#endif
+
+#include "ttfparserfont.h"
+
+namespace Ui { class MainWindow; }
+
+class QSlider;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    void loadFont(const QString &path);
+    void reloadGlyphs();
+    void onVariationChanged();
+
+private slots:
+    void on_chBoxDrawBboxes_stateChanged(int flag);
+    void on_chBoxDrawTtfParser_stateChanged(int flag);
+    void on_chBoxDrawFreeType_stateChanged(int flag);
+    void on_chBoxDrawHarfBuzz_stateChanged(int flag);
+
+private:
+    struct VariationSlider
+    {
+        QSlider *slider;
+        Tag tag;
+    };
+
+    Ui::MainWindow * const ui;
+    QVector<VariationSlider> m_variationSliders;
+    TtfParserFont m_ttfpFont;
+#ifdef WITH_FREETYPE
+    FreeTypeFont m_ftFont;
+#endif
+#ifdef WITH_HARFBUZZ
+    HarfBuzzFont m_hbFont;
+#endif
+};

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/mainwindow.ui

@@ -0,0 +1,156 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>FontView</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>3</number>
+    </property>
+    <property name="topMargin">
+     <number>3</number>
+    </property>
+    <property name="rightMargin">
+     <number>3</number>
+    </property>
+    <property name="bottomMargin">
+     <number>3</number>
+    </property>
+    <item>
+     <widget class="GlyphsView" name="glyphsView" native="true">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QWidget" name="sidebar" native="true">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>200</width>
+        <height>0</height>
+       </size>
+      </property>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <widget class="QCheckBox" name="chBoxDrawTtfParser">
+         <property name="text">
+          <string>Draw ttf-parser</string>
+         </property>
+         <property name="checked">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QCheckBox" name="chBoxDrawFreeType">
+         <property name="text">
+          <string>Draw FreeType</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QCheckBox" name="chBoxDrawHarfBuzz">
+         <property name="text">
+          <string>Draw HarfBuzz</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QCheckBox" name="chBoxDrawBboxes">
+         <property name="text">
+          <string>Draw bboxes</string>
+         </property>
+         <property name="checked">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QWidget" name="widgetVariations" native="true">
+         <layout class="QVBoxLayout" name="verticalLayout_2">
+          <property name="leftMargin">
+           <number>0</number>
+          </property>
+          <property name="topMargin">
+           <number>0</number>
+          </property>
+          <property name="rightMargin">
+           <number>0</number>
+          </property>
+          <property name="bottomMargin">
+           <number>0</number>
+          </property>
+          <item>
+           <widget class="QLabel" name="label">
+            <property name="text">
+             <string>Variations:</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <layout class="QVBoxLayout" name="layVariations"/>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>32</height>
+    </rect>
+   </property>
+  </widget>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>GlyphsView</class>
+   <extends>QWidget</extends>
+   <header>glyphsview.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/ttfparserfont.cpp

@@ -0,0 +1,165 @@
+#include <QTransform>
+#include <QFile>
+#include <QDebug>
+
+#include "ttfparserfont.h"
+
+struct Outliner
+{
+    static void moveToFn(float x, float y, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.moveTo(double(x), double(y));
+    }
+
+    static void lineToFn(float x, float y, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+       self->path.lineTo(double(x), double(y));
+    }
+
+    static void quadToFn(float x1, float y1, float x, float y, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.quadTo(double(x1), double(y1), double(x), double(y));
+    }
+
+    static void curveToFn(float x1, float y1, float x2, float y2, float x, float y, void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.cubicTo(double(x1), double(y1), double(x2), double(y2), double(x), double(y));
+    }
+
+    static void closePathFn(void *user)
+    {
+        auto self = static_cast<Outliner *>(user);
+        self->path.closeSubpath();
+    }
+
+    QPainterPath path;
+};
+
+TtfParserFont::TtfParserFont()
+{
+}
+
+void TtfParserFont::open(const QString &path, const quint32 index)
+{
+    if (isOpen()) {
+        m_face.reset();
+    }
+
+    QFile file(path);
+    file.open(QFile::ReadOnly);
+    m_fontData = file.readAll();
+
+    m_face.reset((ttfp_face*)malloc(ttfp_face_size_of()));
+    const auto res = ttfp_face_init(m_fontData.constData(), m_fontData.size(), index, m_face.get());
+
+    if (!res) {
+        throw tr("Failed to open a font.");
+    }
+}
+
+bool TtfParserFont::isOpen() const
+{
+    return m_face != nullptr;
+}
+
+FontInfo TtfParserFont::fontInfo() const
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    return FontInfo {
+        ttfp_get_ascender(m_face.get()),
+        ttfp_get_height(m_face.get()),
+        ttfp_get_number_of_glyphs(m_face.get()),
+    };
+}
+
+Glyph TtfParserFont::outline(const quint16 gid) const
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    Outliner outliner;
+    ttfp_outline_builder builder;
+    builder.move_to = outliner.moveToFn;
+    builder.line_to = outliner.lineToFn;
+    builder.quad_to = outliner.quadToFn;
+    builder.curve_to = outliner.curveToFn;
+    builder.close_path = outliner.closePathFn;
+
+    ttfp_rect rawBbox;
+
+    const bool ok = ttfp_outline_glyph(
+        m_face.get(),
+        builder,
+        &outliner,
+        gid,
+        &rawBbox
+    );
+
+    if (!ok) {
+        return Glyph {
+            QPainterPath(),
+            QRect(),
+        };
+    }
+
+    const QRect bbox(
+        rawBbox.x_min,
+        -rawBbox.y_max,
+        rawBbox.x_max - rawBbox.x_min,
+        rawBbox.y_max - rawBbox.y_min
+    );
+
+    // Flip outline around x-axis.
+    QTransform ts(1, 0, 0, -1, 0, 0);
+    outliner.path = ts.map(outliner.path);
+
+    outliner.path.setFillRule(Qt::WindingFill);
+
+    return Glyph {
+        outliner.path,
+        bbox,
+    };
+}
+
+QVector<VariationInfo> TtfParserFont::loadVariations()
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    QVector<VariationInfo> variations;
+
+    for (uint16_t i = 0; i < ttfp_get_variation_axes_count(m_face.get()); ++i) {
+        ttfp_variation_axis axis;
+        ttfp_get_variation_axis(m_face.get(), i, &axis);
+
+        variations.append(VariationInfo {
+            Tag(axis.tag).toString(),
+            { static_cast<quint32>(axis.tag) },
+            static_cast<qint16>(axis.min_value),
+            static_cast<qint16>(axis.def_value),
+            static_cast<qint16>(axis.max_value),
+        });
+    }
+
+    return variations;
+}
+
+void TtfParserFont::setVariations(const QVector<Variation> &variations)
+{
+    if (!isOpen()) {
+        throw tr("Font is not loaded.");
+    }
+
+    for (const auto &variation : variations) {
+        ttfp_set_variation(m_face.get(), variation.tag.value, variation.value);
+    }
+}

third-party/vendor/ttf-parser-0.15.2/testing-tools/font-view/ttfparserfont.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <QCoreApplication>
+#include <QPainterPath>
+
+#include <memory>
+
+#define TTFP_VARIABLE_FONTS
+#include <ttfparser.h>
+
+#include "glyph.h"
+
+class TtfParserFont
+{
+    Q_DECLARE_TR_FUNCTIONS(TtfParserFont)
+
+public:
+    TtfParserFont();
+
+    void open(const QString &path, const quint32 index = 0);
+    bool isOpen() const;
+
+    FontInfo fontInfo() const;
+    Glyph outline(const quint16 gid) const;
+
+    QVector<VariationInfo> loadVariations();
+    void setVariations(const QVector<Variation> &variations);
+
+private:
+    struct FreeCPtr
+    { void operator()(void* x) { free(x); } };
+
+    QByteArray m_fontData;
+    std::unique_ptr<ttfp_face, FreeCPtr> m_face;
+};