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Instead of using the first font from the FontCascadeList for all glyphs in a text, we perform a text shaping process that finds a suitable font for each glyph and returns a list of glyph runs, where each glyph run represents consecutive glyphs using the same font.
77 lines
2.2 KiB
C++
77 lines
2.2 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/Utf8View.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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namespace Gfx {
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struct DrawGlyph {
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FloatPoint position;
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u32 glyph_id;
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void translate_by(FloatPoint const& delta)
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{
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position.translate_by(delta);
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}
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};
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typedef struct ShapeFeature {
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char tag[4];
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u32 value;
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} ShapeFeature;
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using ShapeFeatures = Vector<ShapeFeature, 4>;
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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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void append(DrawGlyph glyph) { m_glyphs.append(glyph); }
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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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RefPtr<GlyphRun> shape_text(FloatPoint baseline_start, float letter_spacing, Utf8View string, Gfx::Font const& font, GlyphRun::TextType, ShapeFeatures const& features);
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Vector<NonnullRefPtr<GlyphRun>> shape_text(FloatPoint baseline_start, Utf8View string, FontCascadeList const&);
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float measure_text_width(Utf8View const& string, Gfx::Font const& font, ShapeFeatures const& features);
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}
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