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https://github.com/LadybirdBrowser/ladybird
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66601f7d59
This patch introduces a per-Gfx::Font cache for harfbuzz text shaping results. As long as the same OpenType features are used, we now cache the results of harfbuzz shaping, saving massive amounts of time during text layout. As an example, it saves multiple seconds when loading the ECMAScript specification at <https://tc39.es/ecma262>. Before this change, harfbuzz shaping was taking up roughly 11% of a profile of loading that page. The cache brings it down to 1.8%. Note that the cache currently grows unbounded. I've left a FIXME about adding some limits.
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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* Copyright (c) 2024-2025, 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/AtomicRefCounted.h>
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#include <AK/Forward.h>
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#include <AK/Vector.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/FontCascadeList.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/ShapeFeature.h>
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namespace Gfx {
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struct DrawGlyph {
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FloatPoint position;
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size_t length_in_code_units { 0 };
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float glyph_width { 0.0 };
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u32 glyph_id { 0 };
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};
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class GlyphRun : public AtomicRefCounted<GlyphRun> {
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public:
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enum class TextType {
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Common,
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ContextDependent,
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EndPadding,
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Ltr,
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Rtl,
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};
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GlyphRun(Vector<DrawGlyph>&& glyphs, NonnullRefPtr<Font const> font, TextType text_type, float width)
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: m_glyphs(move(glyphs))
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, m_font(move(font))
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, m_text_type(text_type)
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, m_width(width)
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{
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}
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[[nodiscard]] Font const& font() const { return m_font; }
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[[nodiscard]] TextType text_type() const { return m_text_type; }
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[[nodiscard]] Vector<DrawGlyph> const& glyphs() const { return m_glyphs; }
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[[nodiscard]] Vector<DrawGlyph>& glyphs() { return m_glyphs; }
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[[nodiscard]] bool is_empty() const { return m_glyphs.is_empty(); }
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[[nodiscard]] float width() const { return m_width; }
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private:
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Vector<DrawGlyph> m_glyphs;
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NonnullRefPtr<Font const> m_font;
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TextType m_text_type;
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float m_width { 0 };
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};
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NonnullRefPtr<GlyphRun> shape_text(FloatPoint baseline_start, float letter_spacing, Utf16View const&, Gfx::Font const& font, GlyphRun::TextType, ShapeFeatures const& features);
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Vector<NonnullRefPtr<GlyphRun>> shape_text(FloatPoint baseline_start, Utf16View const&, FontCascadeList const&);
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float measure_text_width(Utf16View const&, Gfx::Font const& font, ShapeFeatures const& features);
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}
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