e3117c12c0
fontconfig's font directory list may contain overlapping entries (e.g. both /usr/share/fonts and /usr/share/fonts/truetype/msttcorefonts) and our recursive walk was visiting each .ttf/.otf/.ttc several times and mmap'ing it once per visit. On a typical Linux system this resulted in 2-3 mappings per file before any actual rendering. Track each font's filesystem path and skip files we've already loaded. Drops WebContent's font-file VMA count from ~7400 to ~2500 on my box.
45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
/*
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* Copyright (c) 2024, Andrew Kaster <andrew@ladybird.org>
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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/Function.h>
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#include <AK/HashMap.h>
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#include <AK/HashTable.h>
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#include <LibGfx/Font/FontDatabase.h>
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#include <LibGfx/Font/Typeface.h>
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namespace Gfx {
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class PathFontProvider final : public SystemFontProvider {
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AK_MAKE_NONCOPYABLE(PathFontProvider);
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AK_MAKE_NONMOVABLE(PathFontProvider);
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public:
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PathFontProvider();
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virtual ~PathFontProvider() override;
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void set_name_but_fixme_should_create_custom_system_font_provider(String name) { m_name = move(name); }
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void load_all_fonts_from_uri(StringView);
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virtual RefPtr<Gfx::Font> get_font(FlyString const& family, float point_size, unsigned weight, unsigned width, unsigned slope, Optional<FontVariationSettings> const& font_variation_settings = {}, Optional<Gfx::ShapeFeatures> const& shape_features = {}) override;
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virtual void for_each_typeface_with_family_name(FlyString const& family_name, Function<void(Typeface const&)>) override;
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virtual StringView name() const LIFETIME_BOUND override { return m_name.bytes_as_string_view(); }
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private:
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HashMap<FlyString, Vector<NonnullRefPtr<Typeface>>, AK::ASCIICaseInsensitiveFlyStringTraits> m_typeface_by_family;
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// Tracks files we've already loaded, to avoid mmap'ing the same .ttf/.otf/.ttc
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// multiple times when overlapping font directories are walked (fontconfig commonly
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// returns nested entries like /usr/share/fonts and /usr/share/fonts/truetype).
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HashTable<String> m_loaded_paths;
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String m_name { "Path"_string };
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};
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}
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