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

2025-07-26 18:17:44 +00:00 · 2022-04-09 09:28:38 +02:00 · 2022-04-09 09:28:38 +02:00 · 206d6ece55
commit 206d6ece55
parent 6f8fd91f22
131 changed files with 177 additions and 176 deletions
--- a/Userland/Libraries/LibGfx/Font/Font.h
+++ b/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;
+};
+
+}