ladybird/Libraries/LibGfx/TextLayout.h
Jelle Raaijmakers 46a46a1c61
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LibGfx+LibWeb: Append glyphs in LineBoxFragment run more efficiently
Since we know the number of glyphs we're going to append, ensure the
LineBoxFragment run's capacity once and perform unchecked appends.
2025-06-17 17:03:33 +02:00

75 lines
2.1 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
* Copyright (c) 2024-2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/AtomicRefCounted.h>
#include <AK/Forward.h>
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/FontCascadeList.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Point.h>
namespace Gfx {
struct DrawGlyph {
FloatPoint position;
u32 glyph_id;
void translate_by(FloatPoint const& delta)
{
position.translate_by(delta);
}
};
typedef struct ShapeFeature {
char tag[4];
u32 value;
} ShapeFeature;
using ShapeFeatures = Vector<ShapeFeature, 4>;
class GlyphRun : public AtomicRefCounted<GlyphRun> {
public:
enum class TextType {
Common,
ContextDependent,
EndPadding,
Ltr,
Rtl,
};
GlyphRun(Vector<DrawGlyph>&& glyphs, NonnullRefPtr<Font const> font, TextType text_type, float width)
: m_glyphs(move(glyphs))
, m_font(move(font))
, m_text_type(text_type)
, m_width(width)
{
}
[[nodiscard]] Font const& font() const { return m_font; }
[[nodiscard]] TextType text_type() const { return m_text_type; }
[[nodiscard]] Vector<DrawGlyph> const& glyphs() const { return m_glyphs; }
[[nodiscard]] Vector<DrawGlyph>& glyphs() { return m_glyphs; }
[[nodiscard]] bool is_empty() const { return m_glyphs.is_empty(); }
[[nodiscard]] float width() const { return m_width; }
private:
Vector<DrawGlyph> m_glyphs;
NonnullRefPtr<Font const> m_font;
TextType m_text_type;
float m_width { 0 };
};
NonnullRefPtr<GlyphRun> shape_text(FloatPoint baseline_start, float letter_spacing, Utf8View string, Gfx::Font const& font, GlyphRun::TextType, ShapeFeatures const& features);
Vector<NonnullRefPtr<GlyphRun>> shape_text(FloatPoint baseline_start, Utf8View string, FontCascadeList const&);
float measure_text_width(Utf8View const& string, Gfx::Font const& font, ShapeFeatures const& features);
}