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https://github.com/LadybirdBrowser/ladybird
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3e704e0fd6
When rendering text, if none of the fonts in the cascade list contain a glyph for a given code point, we now query Skia's font manager to find a system font that can render it.
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* Copyright (c) 2023-2024, 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/Function.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Font/UnicodeRange.h>
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namespace Gfx {
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class FontCascadeList : public RefCounted<FontCascadeList> {
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public:
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using SystemFontFallbackCallback = Function<RefPtr<Font const>(u32, Font const&)>;
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static NonnullRefPtr<FontCascadeList> create()
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{
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return adopt_ref(*new FontCascadeList());
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}
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size_t size() const { return m_fonts.size(); }
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bool is_empty() const { return m_fonts.is_empty() && !m_last_resort_font; }
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Font const& first() const { return !m_fonts.is_empty() ? *m_fonts.first().font : *m_last_resort_font; }
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template<typename Callback>
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void for_each_font_entry(Callback callback) const
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{
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for (auto const& font : m_fonts)
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callback(font);
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}
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void add(NonnullRefPtr<Font const> font);
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void add(NonnullRefPtr<Font const> font, Vector<UnicodeRange> unicode_ranges);
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void extend(FontCascadeList const& other);
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Gfx::Font const& font_for_code_point(u32 code_point) const;
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bool equals(FontCascadeList const& other) const;
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struct Entry {
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NonnullRefPtr<Font const> font;
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struct RangeData {
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// The enclosing range is the union of all Unicode ranges. Used for fast skipping.
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UnicodeRange enclosing_range;
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Vector<UnicodeRange> unicode_ranges;
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};
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Optional<RangeData> range_data;
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};
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void set_last_resort_font(NonnullRefPtr<Font> font) { m_last_resort_font = move(font); }
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void set_system_font_fallback_callback(SystemFontFallbackCallback callback) { m_system_font_fallback_callback = move(callback); }
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Font const& first_text_face() const
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{
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for (auto const& entry : m_fonts)
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if (!entry.font->is_emoji_font())
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return *entry.font;
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return first();
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}
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private:
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RefPtr<Font const> m_last_resort_font;
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mutable Vector<Entry> m_fonts;
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SystemFontFallbackCallback m_system_font_fallback_callback;
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};
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}
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