text_shaper_line.hpp

// Copyright Take Vos 2022.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "text_shaper_char.hpp"
#include "font_metrics.hpp"
#include "../unicode/unicode_bidi_class.hpp"
#include "../geometry/axis_aligned_rectangle.hpp"
#include "../geometry/alignment.hpp"
#include <vector>
 
namespace hi::inline v1 {
 
class text_shaper_line {
public:
    using iterator = std::vector<text_shaper_char>::iterator;
    using const_iterator = std::vector<text_shaper_char>::const_iterator;
    using column_vector = std::vector<iterator>;
 
    iterator first;
 
    iterator last;
 
    column_vector columns;
 
    font_metrics metrics;
 
    size_t line_nr;
 
    float y;
 
    aarectangle rectangle;
 
    float width;
 
    unicode_general_category last_category;
 
    unicode_bidi_class paragraph_direction;
 
    text_shaper_line(
        size_t line_nr,
        const_iterator begin,
        iterator first,
        iterator last,
        float width,
        hi::font_metrics const &metrics) noexcept;
 
    [[nodiscard]] constexpr size_t size() const noexcept
    {
        return columns.size();
    }
 
    [[nodiscard]] constexpr iterator front() const noexcept
    {
        return columns.front();
    }
 
    [[nodiscard]] constexpr iterator back() const noexcept
    {
        return columns.back();
    }
 
    iterator operator[](size_t index) const noexcept
    {
        hi_assert_bounds(index, columns);
        return columns[index];
    }
 
    void layout(horizontal_alignment alignment, float min_x, float max_x, float sub_pixel_width) noexcept;
 
    [[nodiscard]] std::pair<const_iterator,bool> get_nearest(point2 position) const noexcept;
};
 
}