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119 lines
3.4 KiB
C++
119 lines
3.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.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/ByteString.h>
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#include <AK/CharacterTypes.h>
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#include <AK/Forward.h>
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#include <AK/Utf32View.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/Rect.h>
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namespace Gfx {
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inline bool should_paint_as_space(u32 code_point)
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{
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return is_ascii_space(code_point) || code_point == 0xa0;
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}
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enum class IncludeLeftBearing {
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Yes,
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No
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};
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struct DrawGlyph {
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FloatPoint position;
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u32 code_point;
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NonnullRefPtr<Font const> font;
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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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struct DrawEmoji {
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FloatPoint position;
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Gfx::Bitmap const* emoji;
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NonnullRefPtr<Font const> font;
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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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using DrawGlyphOrEmoji = Variant<DrawGlyph, DrawEmoji>;
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class GlyphRun : public RefCounted<GlyphRun> {
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public:
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GlyphRun() = default;
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GlyphRun(Vector<Gfx::DrawGlyphOrEmoji>&& glyphs)
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: m_glyphs(move(glyphs))
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{
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}
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[[nodiscard]] Vector<Gfx::DrawGlyphOrEmoji> const& glyphs() const { return m_glyphs; }
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[[nodiscard]] bool is_empty() const { return m_glyphs.is_empty(); }
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void append(Gfx::DrawGlyphOrEmoji glyph) { m_glyphs.append(glyph); }
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private:
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Vector<Gfx::DrawGlyphOrEmoji> m_glyphs;
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};
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Variant<DrawGlyph, DrawEmoji> prepare_draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font);
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template<typename Callback>
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void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, FontCascadeList const& font_list, Callback callback, IncludeLeftBearing include_left_bearing = IncludeLeftBearing::No, Optional<float&> width = {})
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{
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auto const& space_glyph_font = font_list.font_for_code_point(' ');
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float space_width = space_glyph_font.glyph_width(' ');
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u32 last_code_point = 0;
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auto point = baseline_start;
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for (auto code_point_iterator = string.begin(); code_point_iterator != string.end(); ++code_point_iterator) {
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auto it = code_point_iterator; // The callback function will advance the iterator, so create a copy for this lookup.
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auto code_point = *code_point_iterator;
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RefPtr<Gfx::Font const> font = font_list.font_for_code_point(code_point);
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point.set_y(baseline_start.y() - font->pixel_metrics().ascent);
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if (should_paint_as_space(code_point)) {
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point.translate_by(space_width, 0);
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last_code_point = code_point;
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continue;
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}
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auto kerning = font->glyphs_horizontal_kerning(last_code_point, code_point);
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if (kerning != 0.0f)
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point.translate_by(kerning, 0);
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auto glyph_width = font->glyph_or_emoji_width(it);
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auto glyph_or_emoji = prepare_draw_glyph_or_emoji(point, code_point_iterator, *font);
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if (include_left_bearing == IncludeLeftBearing::Yes) {
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if (glyph_or_emoji.has<DrawGlyph>())
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glyph_or_emoji.get<DrawGlyph>().position += FloatPoint(font->glyph_left_bearing(code_point), 0);
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}
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callback(glyph_or_emoji);
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point.translate_by(glyph_width, 0);
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last_code_point = code_point;
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}
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if (width.has_value())
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*width = point.x();
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}
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}
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