LibGfx: Move other font-related files to LibGfx/Font/

Userland/Libraries/LibGfx/Font/BitmapFont.cpp

@@ -0,0 +1,388 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "BitmapFont.h"
+#include "Emoji.h"
+#include <AK/BuiltinWrappers.h>
+#include <AK/Utf32View.h>
+#include <AK/Utf8View.h>
+#include <LibCore/FileStream.h>
+#include <LibGfx/Font/FontDatabase.h>
+#include <LibGfx/Font/FontStyleMapping.h>
+#include <string.h>
+
+namespace Gfx {
+
+struct [[gnu::packed]] FontFileHeader {
+    char magic[4];
+    u8 glyph_width;
+    u8 glyph_height;
+    u16 range_mask_size;
+    u8 is_variable_width;
+    u8 glyph_spacing;
+    u8 baseline;
+    u8 mean_line;
+    u8 presentation_size;
+    u16 weight;
+    u8 slope;
+    char name[32];
+    char family[32];
+};
+
+static_assert(AssertSize<FontFileHeader, 80>());
+
+static constexpr size_t s_max_glyph_count = 0x110000;
+static constexpr size_t s_max_range_mask_size = s_max_glyph_count / (256 * 8);
+
+NonnullRefPtr<Font> BitmapFont::clone() const
+{
+    auto* new_range_mask = static_cast<u8*>(malloc(m_range_mask_size));
+    memcpy(new_range_mask, m_range_mask, m_range_mask_size);
+    size_t bytes_per_glyph = sizeof(u32) * glyph_height();
+    auto* new_rows = static_cast<u8*>(kmalloc_array(m_glyph_count, bytes_per_glyph));
+    memcpy(new_rows, m_rows, bytes_per_glyph * m_glyph_count);
+    auto* new_widths = static_cast<u8*>(malloc(m_glyph_count));
+    memcpy(new_widths, m_glyph_widths, m_glyph_count);
+    return adopt_ref(*new BitmapFont(m_name, m_family, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height, m_glyph_spacing, m_range_mask_size, new_range_mask, m_baseline, m_mean_line, m_presentation_size, m_weight, m_slope, true));
+}
+
+NonnullRefPtr<BitmapFont> BitmapFont::create(u8 glyph_height, u8 glyph_width, bool fixed, size_t glyph_count)
+{
+    glyph_count += 256 - (glyph_count % 256);
+    glyph_count = min(glyph_count, s_max_glyph_count);
+    size_t glyphs_per_range = 8 * 256;
+    u16 range_mask_size = ceil_div(glyph_count, glyphs_per_range);
+    auto* new_range_mask = static_cast<u8*>(calloc(range_mask_size, 1));
+    for (size_t i = 0; i < glyph_count; i += 256) {
+        new_range_mask[i / 256 / 8] |= 1 << (i / 256 % 8);
+    }
+    size_t bytes_per_glyph = sizeof(u32) * glyph_height;
+    auto* new_rows = static_cast<u8*>(calloc(glyph_count, bytes_per_glyph));
+    auto* new_widths = static_cast<u8*>(calloc(glyph_count, 1));
+    return adopt_ref(*new BitmapFont("Untitled", "Untitled", new_rows, new_widths, fixed, glyph_width, glyph_height, 1, range_mask_size, new_range_mask, 0, 0, 0, 400, 0, true));
+}
+
+NonnullRefPtr<BitmapFont> BitmapFont::unmasked_character_set() const
+{
+    auto* new_range_mask = static_cast<u8*>(malloc(s_max_range_mask_size));
+    constexpr u8 max_bits { 0b1111'1111 };
+    memset(new_range_mask, max_bits, s_max_range_mask_size);
+    size_t bytes_per_glyph = sizeof(u32) * glyph_height();
+    auto* new_rows = static_cast<u8*>(kmalloc_array(s_max_glyph_count, bytes_per_glyph));
+    auto* new_widths = static_cast<u8*>(calloc(s_max_glyph_count, 1));
+    for (size_t code_point = 0; code_point < s_max_glyph_count; ++code_point) {
+        auto index = glyph_index(code_point);
+        if (index.has_value()) {
+            memcpy(&new_widths[code_point], &m_glyph_widths[index.value()], 1);
+            memcpy(&new_rows[code_point * bytes_per_glyph], &m_rows[index.value() * bytes_per_glyph], bytes_per_glyph);
+        }
+    }
+    return adopt_ref(*new BitmapFont(m_name, m_family, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height, m_glyph_spacing, s_max_range_mask_size, new_range_mask, m_baseline, m_mean_line, m_presentation_size, m_weight, m_slope, true));
+}
+
+NonnullRefPtr<BitmapFont> BitmapFont::masked_character_set() const
+{
+    auto* new_range_mask = static_cast<u8*>(calloc(s_max_range_mask_size, 1));
+    u16 new_range_mask_size { 0 };
+    for (size_t i = 0; i < s_max_glyph_count; ++i) {
+        if (m_glyph_widths[i] > 0) {
+            new_range_mask[i / 256 / 8] |= 1 << (i / 256 % 8);
+            if (i / 256 / 8 + 1 > new_range_mask_size)
+                new_range_mask_size = i / 256 / 8 + 1;
+        }
+    }
+    size_t new_glyph_count { 0 };
+    for (size_t i = 0; i < new_range_mask_size; ++i) {
+        new_glyph_count += 256 * popcount(new_range_mask[i]);
+    }
+    size_t bytes_per_glyph = sizeof(u32) * m_glyph_height;
+    auto* new_rows = static_cast<u8*>(calloc(new_glyph_count, bytes_per_glyph));
+    auto* new_widths = static_cast<u8*>(calloc(new_glyph_count, 1));
+    for (size_t i = 0, j = 0; i < s_max_glyph_count; ++i) {
+        if (!(new_range_mask[i / 256 / 8] & 1 << (i / 256 % 8))) {
+            j++;
+            i += 255;
+            continue;
+        }
+        memcpy(&new_widths[i - j * 256], &m_glyph_widths[i], 1);
+        memcpy(&new_rows[(i - j * 256) * bytes_per_glyph], &m_rows[i * bytes_per_glyph], bytes_per_glyph);
+    }
+    return adopt_ref(*new BitmapFont(m_name, m_family, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height, m_glyph_spacing, new_range_mask_size, new_range_mask, m_baseline, m_mean_line, m_presentation_size, m_weight, m_slope, true));
+}
+
+BitmapFont::BitmapFont(String name, String family, u8* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height, u8 glyph_spacing, u16 range_mask_size, u8* range_mask, u8 baseline, u8 mean_line, u8 presentation_size, u16 weight, u8 slope, bool owns_arrays)
+    : m_name(move(name))
+    , m_family(move(family))
+    , m_range_mask_size(range_mask_size)
+    , m_range_mask(range_mask)
+    , m_rows(rows)
+    , m_glyph_widths(widths)
+    , m_glyph_width(glyph_width)
+    , m_glyph_height(glyph_height)
+    , m_min_glyph_width(glyph_width)
+    , m_max_glyph_width(glyph_width)
+    , m_glyph_spacing(glyph_spacing)
+    , m_baseline(baseline)
+    , m_mean_line(mean_line)
+    , m_presentation_size(presentation_size)
+    , m_weight(weight)
+    , m_slope(slope)
+    , m_fixed_width(is_fixed_width)
+    , m_owns_arrays(owns_arrays)
+{
+    VERIFY(m_range_mask);
+    VERIFY(m_rows);
+    VERIFY(m_glyph_widths);
+
+    update_x_height();
+
+    for (size_t i = 0, index = 0; i < m_range_mask_size; ++i) {
+        for (size_t j = 0; j < 8; ++j) {
+            if (m_range_mask[i] & (1 << j)) {
+                m_glyph_count += 256;
+                m_range_indices.append(index++);
+            } else {
+                m_range_indices.append({});
+            }
+        }
+    }
+
+    if (!m_fixed_width) {
+        u8 maximum = 0;
+        u8 minimum = 255;
+        for (size_t i = 0; i < m_glyph_count; ++i) {
+            minimum = min(minimum, m_glyph_widths[i]);
+            maximum = max(maximum, m_glyph_widths[i]);
+        }
+        m_min_glyph_width = minimum;
+        m_max_glyph_width = max(maximum, m_glyph_width);
+    }
+}
+
+BitmapFont::~BitmapFont()
+{
+    if (m_owns_arrays) {
+        free(m_glyph_widths);
+        free(m_rows);
+        free(m_range_mask);
+    }
+}
+
+RefPtr<BitmapFont> BitmapFont::load_from_memory(u8 const* data)
+{
+    auto const& header = *reinterpret_cast<FontFileHeader const*>(data);
+    if (memcmp(header.magic, "!Fnt", 4)) {
+        dbgln("header.magic != '!Fnt', instead it's '{:c}{:c}{:c}{:c}'", header.magic[0], header.magic[1], header.magic[2], header.magic[3]);
+        return nullptr;
+    }
+    if (header.name[sizeof(header.name) - 1] != '\0') {
+        dbgln("Font name not fully null-terminated");
+        return nullptr;
+    }
+
+    if (header.family[sizeof(header.family) - 1] != '\0') {
+        dbgln("Font family not fully null-terminated");
+        return nullptr;
+    }
+
+    size_t bytes_per_glyph = sizeof(u32) * header.glyph_height;
+    size_t glyph_count { 0 };
+    u8* range_mask = const_cast<u8*>(data + sizeof(FontFileHeader));
+    for (size_t i = 0; i < header.range_mask_size; ++i)
+        glyph_count += 256 * popcount(range_mask[i]);
+    u8* rows = range_mask + header.range_mask_size;
+    u8* widths = (u8*)(rows) + glyph_count * bytes_per_glyph;
+    return adopt_ref(*new BitmapFont(String(header.name), String(header.family), rows, widths, !header.is_variable_width, header.glyph_width, header.glyph_height, header.glyph_spacing, header.range_mask_size, range_mask, header.baseline, header.mean_line, header.presentation_size, header.weight, header.slope));
+}
+
+RefPtr<BitmapFont> BitmapFont::load_from_file(String const& path)
+{
+    if (Core::File::is_device(path))
+        return nullptr;
+
+    auto file_or_error = Core::MappedFile::map(path);
+    if (file_or_error.is_error())
+        return nullptr;
+
+    auto font = load_from_memory((u8 const*)file_or_error.value()->data());
+    if (!font)
+        return nullptr;
+
+    font->m_mapped_file = file_or_error.release_value();
+    return font;
+}
+
+bool BitmapFont::write_to_file(String const& path)
+{
+    FontFileHeader header;
+    memset(&header, 0, sizeof(FontFileHeader));
+    memcpy(header.magic, "!Fnt", 4);
+    header.glyph_width = m_glyph_width;
+    header.glyph_height = m_glyph_height;
+    header.range_mask_size = m_range_mask_size;
+    header.baseline = m_baseline;
+    header.mean_line = m_mean_line;
+    header.is_variable_width = !m_fixed_width;
+    header.glyph_spacing = m_glyph_spacing;
+    header.presentation_size = m_presentation_size;
+    header.weight = m_weight;
+    header.slope = m_slope;
+    memcpy(header.name, m_name.characters(), min(m_name.length(), sizeof(header.name) - 1));
+    memcpy(header.family, m_family.characters(), min(m_family.length(), sizeof(header.family) - 1));
+
+    auto stream_result = Core::OutputFileStream::open_buffered(path);
+    if (stream_result.is_error())
+        return false;
+    auto& stream = stream_result.value();
+
+    size_t bytes_per_glyph = sizeof(u32) * m_glyph_height;
+    stream << ReadonlyBytes { &header, sizeof(header) };
+    stream << ReadonlyBytes { m_range_mask, m_range_mask_size };
+    stream << ReadonlyBytes { m_rows, m_glyph_count * bytes_per_glyph };
+    stream << ReadonlyBytes { m_glyph_widths, m_glyph_count };
+
+    stream.flush();
+    return !stream.handle_any_error();
+}
+
+Glyph BitmapFont::glyph(u32 code_point) const
+{
+    // Note: Until all fonts support the 0xFFFD replacement
+    // character, fall back to painting '?' if necessary.
+    auto index = glyph_index(code_point).value_or('?');
+    auto width = m_glyph_widths[index];
+    return Glyph(
+        GlyphBitmap(m_rows, index * m_glyph_height, { width, m_glyph_height }),
+        0,
+        width,
+        m_glyph_height);
+}
+
+Glyph BitmapFont::raw_glyph(u32 code_point) const
+{
+    auto width = m_glyph_widths[code_point];
+    return Glyph(
+        GlyphBitmap(m_rows, code_point * m_glyph_height, { width, m_glyph_height }),
+        0,
+        width,
+        m_glyph_height);
+}
+
+Optional<size_t> BitmapFont::glyph_index(u32 code_point) const
+{
+    auto index = code_point / 256;
+    if (index >= m_range_indices.size())
+        return {};
+    if (!m_range_indices[index].has_value())
+        return {};
+    return m_range_indices[index].value() * 256 + code_point % 256;
+}
+
+bool BitmapFont::contains_glyph(u32 code_point) const
+{
+    auto index = glyph_index(code_point);
+    return index.has_value() && m_glyph_widths[index.value()] > 0;
+}
+
+u8 BitmapFont::glyph_width(u32 code_point) const
+{
+    if (is_ascii(code_point) && !is_ascii_printable(code_point))
+        return 0;
+    auto index = glyph_index(code_point);
+    return m_fixed_width || !index.has_value() ? m_glyph_width : m_glyph_widths[index.value()];
+}
+
+int BitmapFont::glyph_or_emoji_width_for_variable_width_font(u32 code_point) const
+{
+    // FIXME: This is a hack in lieu of proper code point identification.
+    // 0xFFFF is arbitrary but also the end of the Basic Multilingual Plane.
+    if (code_point < 0xFFFF) {
+        auto index = glyph_index(code_point);
+        if (!index.has_value())
+            return glyph_width(0xFFFD);
+        if (m_glyph_widths[index.value()] > 0)
+            return glyph_width(code_point);
+        return glyph_width(0xFFFD);
+    }
+
+    auto const* emoji = Emoji::emoji_for_code_point(code_point);
+    if (emoji == nullptr)
+        return glyph_width(0xFFFD);
+    return glyph_height() * emoji->width() / emoji->height();
+}
+
+int BitmapFont::width(StringView view) const { return unicode_view_width(Utf8View(view)); }
+int BitmapFont::width(Utf8View const& view) const { return unicode_view_width(view); }
+int BitmapFont::width(Utf32View const& view) const { return unicode_view_width(view); }
+
+template<typename T>
+ALWAYS_INLINE int BitmapFont::unicode_view_width(T const& view) const
+{
+    if (view.is_empty())
+        return 0;
+    bool first = true;
+    int width = 0;
+    int longest_width = 0;
+
+    for (u32 code_point : view) {
+        if (code_point == '\n' || code_point == '\r') {
+            first = true;
+            longest_width = max(width, longest_width);
+            width = 0;
+            continue;
+        }
+        if (!first)
+            width += glyph_spacing();
+        first = false;
+        width += glyph_or_emoji_width(code_point);
+    }
+    longest_width = max(width, longest_width);
+    return longest_width;
+}
+
+String BitmapFont::qualified_name() const
+{
+    return String::formatted("{} {} {} {}", family(), presentation_size(), weight(), slope());
+}
+
+String BitmapFont::variant() const
+{
+    StringBuilder builder;
+    builder.append(weight_to_name(weight()));
+    if (slope() != 0) {
+        if (builder.string_view() == "Regular"sv)
+            builder.clear();
+        else
+            builder.append(" ");
+        builder.append(slope_to_name(slope()));
+    }
+    return builder.to_string();
+}
+
+Font const& Font::bold_variant() const
+{
+    if (m_bold_variant)
+        return *m_bold_variant;
+    m_bold_variant = Gfx::FontDatabase::the().get(family(), presentation_size(), 700, 0);
+    if (!m_bold_variant)
+        m_bold_variant = this;
+    return *m_bold_variant;
+}
+
+FontPixelMetrics BitmapFont::pixel_metrics() const
+{
+    return FontPixelMetrics {
+        .size = (float)pixel_size(),
+        .x_height = (float)x_height(),
+        .advance_of_ascii_zero = (float)glyph_width('0'),
+        .glyph_spacing = (float)glyph_spacing(),
+        .ascent = (float)m_baseline,
+        .descent = (float)(m_glyph_height - m_baseline),
+        .line_gap = (float)pixel_size() * 0.4f, // FIXME: Do something nicer here.
+    };
+}
+
+}

Userland/Libraries/LibGfx/Font/BitmapFont.h

@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/CharacterTypes.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+#include <AK/Vector.h>
+#include <LibCore/MappedFile.h>
+#include <LibGfx/Font/Font.h>
+#include <LibGfx/Size.h>
+
+namespace Gfx {
+
+class BitmapFont final : public Font {
+public:
+    NonnullRefPtr<Font> clone() const override;
+    static NonnullRefPtr<BitmapFont> create(u8 glyph_height, u8 glyph_width, bool fixed, size_t glyph_count);
+
+    virtual FontPixelMetrics pixel_metrics() const override;
+
+    NonnullRefPtr<BitmapFont> masked_character_set() const;
+    NonnullRefPtr<BitmapFont> unmasked_character_set() const;
+
+    static RefPtr<BitmapFont> load_from_file(String const& path);
+    bool write_to_file(String const& path);
+
+    ~BitmapFont();
+
+    u8* rows() { return m_rows; }
+    u8* widths() { return m_glyph_widths; }
+
+    u8 presentation_size() const override { return m_presentation_size; }
+    void set_presentation_size(u8 size) { m_presentation_size = size; }
+
+    virtual int pixel_size() const override { return m_glyph_height; }
+    virtual float point_size() const override { return static_cast<float>(m_glyph_height) * 0.75f; }
+
+    u16 weight() const override { return m_weight; }
+    void set_weight(u16 weight) { m_weight = weight; }
+
+    virtual u8 slope() const override { return m_slope; }
+    void set_slope(u8 slope) { m_slope = slope; }
+
+    Glyph glyph(u32 code_point) const override;
+    Glyph raw_glyph(u32 code_point) const;
+    bool contains_glyph(u32 code_point) const override;
+    bool contains_raw_glyph(u32 code_point) const { return m_glyph_widths[code_point] > 0; }
+
+    ALWAYS_INLINE int glyph_or_emoji_width(u32 code_point) const override
+    {
+        if (m_fixed_width)
+            return m_glyph_width;
+        return glyph_or_emoji_width_for_variable_width_font(code_point);
+    }
+    float glyphs_horizontal_kerning(u32, u32) const override { return 0.f; }
+    u8 glyph_height() const override { return m_glyph_height; }
+    int x_height() const override { return m_x_height; }
+    int preferred_line_height() const override { return glyph_height() + m_line_gap; }
+
+    u8 glyph_width(u32 code_point) const override;
+    u8 raw_glyph_width(u32 code_point) const { return m_glyph_widths[code_point]; }
+
+    u8 min_glyph_width() const override { return m_min_glyph_width; }
+    u8 max_glyph_width() const override { return m_max_glyph_width; }
+    u8 glyph_fixed_width() const override { return m_glyph_width; }
+
+    u8 baseline() const override { return m_baseline; }
+    void set_baseline(u8 baseline)
+    {
+        m_baseline = baseline;
+        update_x_height();
+    }
+
+    u8 mean_line() const override { return m_mean_line; }
+    void set_mean_line(u8 mean_line)
+    {
+        m_mean_line = mean_line;
+        update_x_height();
+    }
+
+    int width(StringView) const override;
+    int width(Utf8View const&) const override;
+    int width(Utf32View const&) const override;
+
+    String name() const override { return m_name; }
+    void set_name(String name) { m_name = move(name); }
+
+    bool is_fixed_width() const override { return m_fixed_width; }
+    void set_fixed_width(bool b) { m_fixed_width = b; }
+
+    u8 glyph_spacing() const override { return m_glyph_spacing; }
+    void set_glyph_spacing(u8 spacing) { m_glyph_spacing = spacing; }
+
+    void set_glyph_width(u32 code_point, u8 width)
+    {
+        VERIFY(m_glyph_widths);
+        m_glyph_widths[code_point] = width;
+    }
+
+    size_t glyph_count() const override { return m_glyph_count; }
+    Optional<size_t> glyph_index(u32 code_point) const;
+
+    u16 range_size() const { return m_range_mask_size; }
+    bool is_range_empty(u32 code_point) const { return !(m_range_mask[code_point / 256 / 8] & 1 << (code_point / 256 % 8)); }
+
+    String family() const override { return m_family; }
+    void set_family(String family) { m_family = move(family); }
+    String variant() const override;
+
+    String qualified_name() const override;
+    String human_readable_name() const override { return String::formatted("{} {} {}", family(), variant(), presentation_size()); }
+
+private:
+    BitmapFont(String name, String family, u8* rows, u8* widths, bool is_fixed_width,
+        u8 glyph_width, u8 glyph_height, u8 glyph_spacing, u16 range_mask_size, u8* range_mask,
+        u8 baseline, u8 mean_line, u8 presentation_size, u16 weight, u8 slope, bool owns_arrays = false);
+
+    static RefPtr<BitmapFont> load_from_memory(u8 const*);
+
+    template<typename T>
+    int unicode_view_width(T const& view) const;
+
+    void update_x_height() { m_x_height = m_baseline - m_mean_line; };
+    int glyph_or_emoji_width_for_variable_width_font(u32 code_point) const;
+
+    String m_name;
+    String m_family;
+    size_t m_glyph_count { 0 };
+
+    u16 m_range_mask_size { 0 };
+    u8* m_range_mask { nullptr };
+    Vector<Optional<size_t>> m_range_indices;
+
+    u8* m_rows { nullptr };
+    u8* m_glyph_widths { nullptr };
+    RefPtr<Core::MappedFile> m_mapped_file;
+
+    u8 m_glyph_width { 0 };
+    u8 m_glyph_height { 0 };
+    u8 m_x_height { 0 };
+    u8 m_min_glyph_width { 0 };
+    u8 m_max_glyph_width { 0 };
+    u8 m_glyph_spacing { 0 };
+    u8 m_baseline { 0 };
+    u8 m_mean_line { 0 };
+    u8 m_presentation_size { 0 };
+    u16 m_weight { 0 };
+    u8 m_slope { 0 };
+    u8 m_line_gap { 4 };
+
+    bool m_fixed_width { false };
+    bool m_owns_arrays { false };
+};
+
+}

Userland/Libraries/LibGfx/Font/Emoji.cpp

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/HashMap.h>
+#include <AK/Span.h>
+#include <AK/String.h>
+#include <AK/Utf8View.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/Font/Emoji.h>
+
+namespace Gfx {
+
+// https://unicode.org/reports/tr51/
+// https://unicode.org/emoji/charts/emoji-list.html
+// https://unicode.org/emoji/charts/emoji-zwj-sequences.html
+
+static HashMap<Span<u32>, RefPtr<Gfx::Bitmap>> s_emojis;
+
+Bitmap const* Emoji::emoji_for_code_point(u32 code_point)
+{
+    return emoji_for_code_points(Array { code_point });
+}
+
+Bitmap const* Emoji::emoji_for_code_points(Span<u32> const& code_points)
+{
+    auto it = s_emojis.find(code_points);
+    if (it != s_emojis.end())
+        return (*it).value.ptr();
+
+    auto basename = String::join('_', code_points, "U+{:X}");
+    auto bitmap_or_error = Bitmap::try_load_from_file(String::formatted("/res/emoji/{}.png", basename));
+    if (bitmap_or_error.is_error()) {
+        s_emojis.set(code_points, nullptr);
+        return nullptr;
+    }
+    auto bitmap = bitmap_or_error.release_value();
+    s_emojis.set(code_points, bitmap);
+    return bitmap.ptr();
+}
+
+Bitmap const* Emoji::emoji_for_code_point_iterator(Utf8CodePointIterator& it)
+{
+    // NOTE: I'm sure this could be more efficient, e.g. by checking if each code point falls
+    // into a certain range in the loop below (emojis, modifiers, variation selectors, ZWJ),
+    // and bailing out early if not. Current worst case is 10 file lookups for any sequence of
+    // code points (if the first glyph isn't part of the font in regular text rendering).
+
+    constexpr size_t max_emoji_code_point_sequence_length = 10;
+
+    Vector<u32, max_emoji_code_point_sequence_length> code_points;
+
+    struct EmojiAndCodePoints {
+        Bitmap const* emoji;
+        Span<u32> code_points;
+    };
+    Vector<EmojiAndCodePoints, max_emoji_code_point_sequence_length> possible_emojis;
+
+    // Determine all existing emojis for the longest possible ZWJ emoji sequence,
+    // or until we run out of code points in the iterator.
+    for (size_t i = 0; i < max_emoji_code_point_sequence_length; ++i) {
+        auto code_point = it.peek(i);
+        if (!code_point.has_value())
+            break;
+        code_points.append(*code_point);
+        if (auto const* emoji = emoji_for_code_points(code_points))
+            possible_emojis.empend(emoji, code_points);
+    }
+
+    if (possible_emojis.is_empty())
+        return nullptr;
+
+    // If we found one or more matches, return the longest, i.e. last. For example:
+    // U+1F3F3 - white flag
+    // U+1F3F3 U+FE0F U+200D U+1F308 - rainbow flag
+    auto& [emoji, emoji_code_points] = possible_emojis.last();
+
+    // Advance the iterator, so it's on the last code point of our found emoji and
+    // whoever is iterating will advance to the next new code point.
+    for (size_t i = 0; i < emoji_code_points.size() - 1; ++i)
+        ++it;
+
+    return emoji;
+}
+
+}

Userland/Libraries/LibGfx/Font/Emoji.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <AK/Types.h>
+
+namespace Gfx {
+
+class Bitmap;
+
+class Emoji {
+public:
+    static Gfx::Bitmap const* emoji_for_code_point(u32 code_point);
+    static Gfx::Bitmap const* emoji_for_code_points(Span<u32> const&);
+    static Gfx::Bitmap const* emoji_for_code_point_iterator(Utf8CodePointIterator&);
+};
+
+}

Userland/Libraries/LibGfx/Font/Font.h

@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Bitmap.h>
+#include <AK/ByteReader.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+#include <LibCore/MappedFile.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/Size.h>
+
+namespace Gfx {
+
+// FIXME: Make a MutableGlyphBitmap buddy class for FontEditor instead?
+class GlyphBitmap {
+public:
+    GlyphBitmap() = default;
+    GlyphBitmap(u8 const* rows, size_t start_index, IntSize size)
+        : m_rows(rows)
+        , m_start_index(start_index)
+        , m_size(size)
+    {
+    }
+
+    unsigned row(unsigned index) const { return ByteReader::load32(bitmap(index).data()); }
+
+    bool bit_at(int x, int y) const { return bitmap(y).get(x); }
+    void set_bit_at(int x, int y, bool b) { bitmap(y).set(x, b); }
+
+    IntSize size() const { return m_size; }
+    int width() const { return m_size.width(); }
+    int height() const { return m_size.height(); }
+
+    static constexpr size_t bytes_per_row() { return sizeof(u32); }
+    static constexpr int max_width() { return bytes_per_row() * 8; }
+    static constexpr int max_height() { return max_width() + bytes_per_row(); }
+
+private:
+    AK::Bitmap bitmap(size_t y) const
+    {
+        return { const_cast<u8*>(m_rows) + bytes_per_row() * (m_start_index + y), bytes_per_row() * 8 };
+    }
+
+    u8 const* m_rows { nullptr };
+    size_t m_start_index { 0 };
+    IntSize m_size { 0, 0 };
+};
+
+class Glyph {
+public:
+    Glyph(GlyphBitmap const& glyph_bitmap, int left_bearing, int advance, int ascent)
+        : m_glyph_bitmap(glyph_bitmap)
+        , m_left_bearing(left_bearing)
+        , m_advance(advance)
+        , m_ascent(ascent)
+    {
+    }
+
+    Glyph(RefPtr<Bitmap> bitmap, int left_bearing, int advance, int ascent)
+        : m_bitmap(bitmap)
+        , m_left_bearing(left_bearing)
+        , m_advance(advance)
+        , m_ascent(ascent)
+    {
+    }
+
+    bool is_glyph_bitmap() const { return !m_bitmap; }
+    GlyphBitmap glyph_bitmap() const { return m_glyph_bitmap; }
+    RefPtr<Bitmap> bitmap() const { return m_bitmap; }
+    int left_bearing() const { return m_left_bearing; }
+    int advance() const { return m_advance; }
+    int ascent() const { return m_ascent; }
+
+private:
+    GlyphBitmap m_glyph_bitmap;
+    RefPtr<Bitmap> m_bitmap;
+    int m_left_bearing;
+    int m_advance;
+    int m_ascent;
+};
+
+struct FontPixelMetrics {
+    float size { 0 };
+    float x_height { 0 };
+    float advance_of_ascii_zero { 0 };
+    float glyph_spacing { 0 };
+
+    // Number of pixels the font extends above the baseline.
+    float ascent { 0 };
+
+    // Number of pixels the font descends below the baseline.
+    float descent { 0 };
+
+    // Line gap specified by font.
+    float line_gap { 0 };
+
+    float line_spacing() const { return roundf(ascent) + roundf(descent) + roundf(line_gap); }
+};
+
+class Font : public RefCounted<Font> {
+public:
+    enum class AllowInexactSizeMatch {
+        No,
+        Yes,
+    };
+
+    virtual NonnullRefPtr<Font> clone() const = 0;
+    virtual ~Font() {};
+
+    virtual FontPixelMetrics pixel_metrics() const = 0;
+
+    virtual u8 presentation_size() const = 0;
+    virtual int pixel_size() const = 0;
+    virtual float point_size() const = 0;
+    virtual u8 slope() const = 0;
+
+    virtual u16 weight() const = 0;
+    virtual Glyph glyph(u32 code_point) const = 0;
+    virtual bool contains_glyph(u32 code_point) const = 0;
+
+    virtual u8 glyph_width(u32 code_point) const = 0;
+    virtual int glyph_or_emoji_width(u32 code_point) const = 0;
+    virtual float glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const = 0;
+    virtual u8 glyph_height() const = 0;
+    virtual int x_height() const = 0;
+    virtual int preferred_line_height() const = 0;
+
+    virtual u8 min_glyph_width() const = 0;
+    virtual u8 max_glyph_width() const = 0;
+    virtual u8 glyph_fixed_width() const = 0;
+
+    virtual u8 baseline() const = 0;
+    virtual u8 mean_line() const = 0;
+
+    virtual int width(StringView) const = 0;
+    virtual int width(Utf8View const&) const = 0;
+    virtual int width(Utf32View const&) const = 0;
+
+    virtual String name() const = 0;
+
+    virtual bool is_fixed_width() const = 0;
+
+    virtual u8 glyph_spacing() const = 0;
+
+    virtual size_t glyph_count() const = 0;
+
+    virtual String family() const = 0;
+    virtual String variant() const = 0;
+
+    virtual String qualified_name() const = 0;
+    virtual String human_readable_name() const = 0;
+
+    Font const& bold_variant() const;
+
+private:
+    mutable RefPtr<Gfx::Font> m_bold_variant;
+};
+
+}

Userland/Libraries/LibGfx/Font/FontDatabase.cpp

@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/FlyString.h>
+#include <AK/NonnullRefPtrVector.h>
+#include <AK/QuickSort.h>
+#include <LibCore/DirIterator.h>
+#include <LibGfx/Font/Font.h>
+#include <LibGfx/Font/FontDatabase.h>
+#include <LibGfx/Font/TrueType/Font.h>
+#include <LibGfx/Font/Typeface.h>
+#include <stdlib.h>
+
+namespace Gfx {
+
+FontDatabase& FontDatabase::the()
+{
+    static FontDatabase s_the;
+    return s_the;
+}
+
+static RefPtr<Font> s_default_font;
+static String s_default_font_query;
+static RefPtr<Font> s_fixed_width_font;
+static String s_fixed_width_font_query;
+static String s_default_fonts_lookup_path = "/res/fonts";
+
+void FontDatabase::set_default_font_query(String query)
+{
+    if (s_default_font_query == query)
+        return;
+    s_default_font_query = move(query);
+    s_default_font = nullptr;
+}
+
+String FontDatabase::default_font_query()
+{
+    return s_default_font_query;
+}
+
+void FontDatabase::set_default_fonts_lookup_path(String path)
+{
+    if (s_default_fonts_lookup_path == path)
+        return;
+    s_default_fonts_lookup_path = move(path);
+}
+
+String FontDatabase::default_fonts_lookup_path()
+{
+    return s_default_fonts_lookup_path;
+}
+
+Font& FontDatabase::default_font()
+{
+    if (!s_default_font) {
+        VERIFY(!s_default_font_query.is_empty());
+        s_default_font = FontDatabase::the().get_by_name(s_default_font_query);
+        VERIFY(s_default_font);
+    }
+    return *s_default_font;
+}
+
+void FontDatabase::set_fixed_width_font_query(String query)
+{
+    if (s_fixed_width_font_query == query)
+        return;
+    s_fixed_width_font_query = move(query);
+    s_fixed_width_font = nullptr;
+}
+
+String FontDatabase::fixed_width_font_query()
+{
+    return s_fixed_width_font_query;
+}
+
+Font& FontDatabase::default_fixed_width_font()
+{
+    if (!s_fixed_width_font) {
+        VERIFY(!s_fixed_width_font_query.is_empty());
+        s_fixed_width_font = FontDatabase::the().get_by_name(s_fixed_width_font_query);
+        VERIFY(s_fixed_width_font);
+    }
+    return *s_fixed_width_font;
+}
+
+struct FontDatabase::Private {
+    HashMap<String, NonnullRefPtr<Gfx::Font>> full_name_to_font_map;
+    Vector<RefPtr<Typeface>> typefaces;
+};
+
+FontDatabase::FontDatabase()
+    : m_private(make<Private>())
+{
+    Core::DirIterator dir_iterator(s_default_fonts_lookup_path, Core::DirIterator::SkipDots);
+    if (dir_iterator.has_error()) {
+        warnln("DirIterator: {}", dir_iterator.error_string());
+        exit(1);
+    }
+    while (dir_iterator.has_next()) {
+        auto path = dir_iterator.next_full_path();
+
+        if (path.ends_with(".font"sv)) {
+            if (auto font = Gfx::BitmapFont::load_from_file(path)) {
+                m_private->full_name_to_font_map.set(font->qualified_name(), *font);
+                auto typeface = get_or_create_typeface(font->family(), font->variant());
+                typeface->add_bitmap_font(font);
+            }
+        } else if (path.ends_with(".ttf"sv)) {
+            // FIXME: What about .otf and .woff
+            if (auto font_or_error = TTF::Font::try_load_from_file(path); !font_or_error.is_error()) {
+                auto font = font_or_error.release_value();
+                auto typeface = get_or_create_typeface(font->family(), font->variant());
+                typeface->set_ttf_font(move(font));
+            }
+        }
+    }
+}
+
+void FontDatabase::for_each_font(Function<void(Gfx::Font const&)> callback)
+{
+    Vector<RefPtr<Gfx::Font>> fonts;
+    fonts.ensure_capacity(m_private->full_name_to_font_map.size());
+    for (auto& it : m_private->full_name_to_font_map)
+        fonts.append(it.value);
+    quick_sort(fonts, [](auto& a, auto& b) { return a->qualified_name() < b->qualified_name(); });
+    for (auto& font : fonts)
+        callback(*font);
+}
+
+void FontDatabase::for_each_fixed_width_font(Function<void(Gfx::Font const&)> callback)
+{
+    Vector<RefPtr<Gfx::Font>> fonts;
+    fonts.ensure_capacity(m_private->full_name_to_font_map.size());
+    for (auto& it : m_private->full_name_to_font_map) {
+        if (it.value->is_fixed_width())
+            fonts.append(it.value);
+    }
+    quick_sort(fonts, [](auto& a, auto& b) { return a->qualified_name() < b->qualified_name(); });
+    for (auto& font : fonts)
+        callback(*font);
+}
+
+RefPtr<Gfx::Font> FontDatabase::get_by_name(StringView name)
+{
+    auto it = m_private->full_name_to_font_map.find(name);
+    if (it == m_private->full_name_to_font_map.end()) {
+        auto parts = name.split_view(" "sv);
+        if (parts.size() >= 4) {
+            auto slope = parts.take_last().to_int().value_or(0);
+            auto weight = parts.take_last().to_int().value_or(0);
+            auto size = parts.take_last().to_int().value_or(0);
+            auto family = String::join(' ', parts);
+            return get(family, size, weight, slope);
+        }
+        dbgln("Font lookup failed: '{}'", name);
+        return nullptr;
+    }
+    return it->value;
+}
+
+RefPtr<Gfx::Font> FontDatabase::get(FlyString const& family, float point_size, unsigned weight, unsigned slope, Font::AllowInexactSizeMatch allow_inexact_size_match)
+{
+    for (auto typeface : m_private->typefaces) {
+        if (typeface->family() == family && typeface->weight() == weight && typeface->slope() == slope)
+            return typeface->get_font(point_size, allow_inexact_size_match);
+    }
+    return nullptr;
+}
+
+RefPtr<Gfx::Font> FontDatabase::get(FlyString const& family, FlyString const& variant, float point_size, Font::AllowInexactSizeMatch allow_inexact_size_match)
+{
+    for (auto typeface : m_private->typefaces) {
+        if (typeface->family() == family && typeface->variant() == variant)
+            return typeface->get_font(point_size, allow_inexact_size_match);
+    }
+    return nullptr;
+}
+
+RefPtr<Typeface> FontDatabase::get_or_create_typeface(String const& family, String const& variant)
+{
+    for (auto typeface : m_private->typefaces) {
+        if (typeface->family() == family && typeface->variant() == variant)
+            return typeface;
+    }
+    auto typeface = adopt_ref(*new Typeface(family, variant));
+    m_private->typefaces.append(typeface);
+    return typeface;
+}
+
+void FontDatabase::for_each_typeface(Function<void(Typeface const&)> callback)
+{
+    for (auto typeface : m_private->typefaces) {
+        callback(*typeface);
+    }
+}
+
+}

Userland/Libraries/LibGfx/Font/FontDatabase.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Function.h>
+#include <AK/HashMap.h>
+#include <AK/OwnPtr.h>
+#include <AK/String.h>
+#include <LibGfx/Font/Typeface.h>
+#include <LibGfx/Forward.h>
+
+namespace Gfx {
+
+namespace FontWeight {
+enum {
+    Thin = 100,
+    ExtraLight = 200,
+    Light = 300,
+    Regular = 400,
+    Medium = 500,
+    SemiBold = 600,
+    Bold = 700,
+    ExtraBold = 800,
+    Black = 900,
+    ExtraBlack = 950
+};
+}
+
+class FontDatabase {
+public:
+    static FontDatabase& the();
+
+    static Font& default_font();
+    static Font& default_fixed_width_font();
+
+    static String default_font_query();
+    static String fixed_width_font_query();
+    static String default_fonts_lookup_path();
+    static void set_default_font_query(String);
+    static void set_fixed_width_font_query(String);
+    static void set_default_fonts_lookup_path(String);
+
+    RefPtr<Gfx::Font> get(FlyString const& family, float point_size, unsigned weight, unsigned slope, Font::AllowInexactSizeMatch = Font::AllowInexactSizeMatch::No);
+    RefPtr<Gfx::Font> get(FlyString const& family, FlyString const& variant, float point_size, Font::AllowInexactSizeMatch = Font::AllowInexactSizeMatch::No);
+    RefPtr<Gfx::Font> get_by_name(StringView);
+    void for_each_font(Function<void(Gfx::Font const&)>);
+    void for_each_fixed_width_font(Function<void(Gfx::Font const&)>);
+
+    void for_each_typeface(Function<void(Typeface const&)>);
+
+private:
+    FontDatabase();
+    ~FontDatabase() = default;
+
+    RefPtr<Typeface> get_or_create_typeface(String const& family, String const& variant);
+
+    struct Private;
+    OwnPtr<Private> m_private;
+};
+
+}

Userland/Libraries/LibGfx/Font/FontStyleMapping.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/StringView.h>
+
+namespace Gfx {
+
+struct FontStyleMapping {
+    constexpr FontStyleMapping(int s, char const* n)
+        : style(s)
+        , name(n)
+    {
+    }
+    int style { 0 };
+    StringView name;
+};
+
+static constexpr FontStyleMapping font_weight_names[] = {
+    { 100, "Thin" },
+    { 200, "Extra Light" },
+    { 300, "Light" },
+    { 400, "Regular" },
+    { 500, "Medium" },
+    { 600, "Semi Bold" },
+    { 700, "Bold" },
+    { 800, "Extra Bold" },
+    { 900, "Black" },
+    { 950, "Extra Black" },
+};
+
+static constexpr FontStyleMapping font_slope_names[] = {
+    { 0, "Regular" },
+    { 1, "Italic" },
+    { 2, "Oblique" },
+    { 3, "Reclined" }
+};
+
+static constexpr StringView weight_to_name(int weight)
+{
+    for (auto& it : font_weight_names) {
+        if (it.style == weight)
+            return it.name;
+    }
+    return {};
+}
+
+static constexpr int name_to_weight(StringView name)
+{
+    for (auto& it : font_weight_names) {
+        if (it.name == name)
+            return it.style;
+    }
+    return {};
+}
+
+static constexpr StringView slope_to_name(int slope)
+{
+    for (auto& it : font_slope_names) {
+        if (it.style == slope)
+            return it.name;
+    }
+    return {};
+}
+
+static constexpr int name_to_slope(StringView name)
+{
+    for (auto& it : font_slope_names) {
+        if (it.name == name)
+            return it.style;
+    }
+    return {};
+}
+
+}

Userland/Libraries/LibGfx/Font/TrueType/Font.h

@@ -11,11 +11,11 @@
 #include <AK/RefCounted.h>
 #include <AK/StringView.h>
 #include <LibGfx/Bitmap.h>
-#include <LibGfx/Font.h>
-#include <LibGfx/Size.h>
+#include <LibGfx/Font/Font.h>
 #include <LibGfx/Font/TrueType/Cmap.h>
 #include <LibGfx/Font/TrueType/Glyf.h>
 #include <LibGfx/Font/TrueType/Tables.h>
+#include <LibGfx/Size.h>
 
 #define POINTS_PER_INCH 72.0f
 #define DEFAULT_DPI 96

Userland/Libraries/LibGfx/Font/Typeface.cpp

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGfx/Font/Typeface.h>
+
+namespace Gfx {
+
+unsigned Typeface::weight() const
+{
+    VERIFY(m_ttf_font || m_bitmap_fonts.size() > 0);
+
+    if (is_fixed_size())
+        return m_bitmap_fonts[0]->weight();
+
+    return m_ttf_font->weight();
+}
+
+u8 Typeface::slope() const
+{
+    VERIFY(m_ttf_font || m_bitmap_fonts.size() > 0);
+
+    if (is_fixed_size())
+        return m_bitmap_fonts[0]->slope();
+
+    return m_ttf_font->slope();
+}
+
+bool Typeface::is_fixed_width() const
+{
+    VERIFY(m_ttf_font || m_bitmap_fonts.size() > 0);
+
+    if (is_fixed_size())
+        return m_bitmap_fonts[0]->is_fixed_width();
+
+    return m_ttf_font->is_fixed_width();
+}
+
+void Typeface::add_bitmap_font(RefPtr<BitmapFont> font)
+{
+    m_bitmap_fonts.append(font);
+}
+
+void Typeface::set_ttf_font(RefPtr<TTF::Font> font)
+{
+    m_ttf_font = move(font);
+}
+
+RefPtr<Font> Typeface::get_font(float point_size, Font::AllowInexactSizeMatch allow_inexact_size_match) const
+{
+    VERIFY(point_size > 0);
+
+    if (m_ttf_font)
+        return adopt_ref(*new TTF::ScaledFont(*m_ttf_font, point_size, point_size));
+
+    RefPtr<BitmapFont> best_match;
+    int size = roundf(point_size);
+    int best_delta = NumericLimits<int>::max();
+
+    for (auto font : m_bitmap_fonts) {
+        if (font->presentation_size() == size)
+            return font;
+        if (allow_inexact_size_match == Font::AllowInexactSizeMatch::Yes) {
+            int delta = static_cast<int>(font->presentation_size()) - static_cast<int>(size);
+            if (abs(delta) < best_delta) {
+                best_match = font;
+                best_delta = abs(delta);
+            }
+        }
+    }
+
+    if (allow_inexact_size_match == Font::AllowInexactSizeMatch::Yes && best_match)
+        return best_match;
+
+    return {};
+}
+
+void Typeface::for_each_fixed_size_font(Function<void(Font const&)> callback) const
+{
+    for (auto font : m_bitmap_fonts) {
+        callback(*font);
+    }
+}
+
+}

Userland/Libraries/LibGfx/Font/Typeface.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/FlyString.h>
+#include <AK/Function.h>
+#include <AK/RefCounted.h>
+#include <AK/Vector.h>
+#include <LibGfx/Font/BitmapFont.h>
+#include <LibGfx/Font/Font.h>
+#include <LibGfx/Font/TrueType/Font.h>
+
+namespace Gfx {
+
+class Typeface : public RefCounted<Typeface> {
+public:
+    Typeface(String const& family, String const& variant)
+        : m_family(family)
+        , m_variant(variant)
+    {
+    }
+
+    FlyString const& family() const { return m_family; }
+    FlyString const& variant() const { return m_variant; }
+    unsigned weight() const;
+    u8 slope() const;
+
+    bool is_fixed_width() const;
+    bool is_fixed_size() const { return !m_bitmap_fonts.is_empty(); }
+    void for_each_fixed_size_font(Function<void(Font const&)>) const;
+
+    void add_bitmap_font(RefPtr<BitmapFont>);
+    void set_ttf_font(RefPtr<TTF::Font>);
+
+    RefPtr<Font> get_font(float point_size, Font::AllowInexactSizeMatch = Font::AllowInexactSizeMatch::No) const;
+
+private:
+    FlyString m_family;
+    FlyString m_variant;
+
+    Vector<RefPtr<BitmapFont>> m_bitmap_fonts;
+    RefPtr<TTF::Font> m_ttf_font;
+};
+
+}