text_buffer.hpp

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#pragma once
#include "le2d/primitive.hpp"
#include "le2d/render_instance.hpp"
#include "le2d/resource/font.hpp"
#include "le2d/text/text_geometry.hpp"
#include <deque>
#include <gsl/pointers>
#include <span>
 
namespace le {
class TextBuffer {
  public:
    explicit TextBuffer(gsl::not_null<IFontAtlas*> atlas, std::size_t limit, float n_line_spacing = 1.5f);
 
    void push_front(std::string text, kvf::Color color) { push_front({&text, 1}, color); }
    void push_front(std::span<std::string> lines, kvf::Color color);
 
    [[nodiscard]] auto get_size() const -> glm::vec2 { return m_size; }
 
    [[nodiscard]] auto to_primitive() const -> Primitive;
 
  private:
    struct Line {
        std::string text{};
        kvf::Color color{};
    };
 
    void refresh();
 
    gsl::not_null<IFontAtlas*> m_atlas;
    std::size_t m_limit;
    float m_n_line_spacing;
 
    std::deque<Line> m_lines{};
 
    std::vector<kvf::ttf::GlyphLayout> m_layouts{};
    TextGeometry m_geometry{};
    glm::vec4 m_size{};
};
} // namespace le