mirror of
https://github.com/LadybirdBrowser/ladybird
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0fc0c84856
This uses some heuristics since I don't think there's a simple way to determine if something is "an emoji font".
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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* Copyright (c) 2023-2025, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <AK/Utf16String.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Font/Typeface.h>
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#include <LibGfx/ShapeFeature.h>
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class SkFont;
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struct hb_font_t;
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struct hb_buffer_t;
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namespace Gfx {
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struct FontPixelMetrics {
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float size { 0 };
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float x_height { 0 };
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float advance_of_ascii_zero { 0 };
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// Number of pixels the font extends above the baseline.
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float ascent { 0 };
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// Number of pixels the font descends below the baseline.
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float descent { 0 };
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// Line gap specified by font.
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float line_gap { 0 };
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float line_spacing() const { return ascent + descent + line_gap; }
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};
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// https://learn.microsoft.com/en-us/typography/opentype/spec/os2#uswidthclass
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enum FontWidth {
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UltraCondensed = 1,
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ExtraCondensed = 2,
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Condensed = 3,
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SemiCondensed = 4,
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Normal = 5,
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SemiExpanded = 6,
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Expanded = 7,
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ExtraExpanded = 8,
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UltraExpanded = 9
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};
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constexpr float text_shaping_resolution = 64;
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class Font : public RefCounted<Font> {
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public:
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Font(NonnullRefPtr<Typeface const>, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI, FontVariationSettings const variations = {});
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ScaledFontMetrics metrics() const;
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~Font();
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float point_size() const;
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float pixel_size() const;
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FontPixelMetrics const& pixel_metrics() const { return m_pixel_metrics; }
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u8 slope() const { return m_typeface->slope(); }
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u16 weight() const { return m_typeface->weight(); }
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bool contains_glyph(u32 code_point) const { return m_typeface->glyph_id_for_code_point(code_point) > 0; }
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float glyph_width(u32 code_point) const;
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u32 glyph_id_for_code_point(u32 code_point) const { return m_typeface->glyph_id_for_code_point(code_point); }
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float preferred_line_height() const { return metrics().height() + metrics().line_gap; }
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int x_height() const { return m_point_height; } // FIXME: Read from font
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u8 baseline() const { return m_point_height; } // FIXME: Read from font
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float width(Utf16View const&) const;
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FlyString const& family() const { return m_typeface->family(); }
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NonnullRefPtr<Font> scaled_with_size(float point_size) const;
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NonnullRefPtr<Font> with_size(float point_size) const;
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Typeface const& typeface() const { return m_typeface; }
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SkFont skia_font(float scale) const;
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Font const& bold_variant() const;
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hb_font_t* harfbuzz_font() const;
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struct ShapingCache {
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// Before using the cache, make sure the features match! If they don't, clear the cache.
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ShapeFeatures features;
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HashMap<Utf16String, hb_buffer_t*> map;
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hb_buffer_t* single_ascii_character_map[128] { nullptr };
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~ShapingCache();
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void clear();
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};
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ShapingCache& shaping_cache() const { return m_shaping_cache; }
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bool is_emoji_font() const;
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private:
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mutable RefPtr<Font const> m_bold_variant;
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mutable hb_font_t* m_harfbuzz_font { nullptr };
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mutable ShapingCache m_shaping_cache;
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mutable TriState m_is_emoji_font { TriState::Unknown };
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NonnullRefPtr<Typeface const> m_typeface;
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float m_x_scale { 0.0f };
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float m_y_scale { 0.0f };
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float m_point_width { 0.0f };
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float m_point_height { 0.0f };
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FontVariationSettings const m_font_variation_settings;
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FontPixelMetrics m_pixel_metrics;
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float m_pixel_size { 0.0f };
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};
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}
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