font.hpp

// SPDX-License-Identifier: MIT
#ifndef LIBSBX_UI_FONT_HPP_
#define LIBSBX_UI_FONT_HPP_
 
#include <string>
#include <fstream>
#include <filesystem>
#include <unordered_map>
 
#include <nlohmann/json.hpp>
 
#include <libsbx/memory/observer_ptr.hpp>
 
#include <libsbx/math/vector2.hpp>
 
#include <libsbx/graphics/images/image2d.hpp>
 
namespace sbx::ui {
 
struct glyph {
  std::float_t advance{0.0f};
 
  std::float_t plane_left{0.0f};
  std::float_t plane_bottom{0.0f};
  std::float_t plane_right{0.0f};
  std::float_t plane_top{0.0f};
 
  std::float_t uv_left{0.0f};
  std::float_t uv_bottom{0.0f};
  std::float_t uv_right{0.0f};
  std::float_t uv_top{0.0f};
}; // struct glyph
 
struct font {
  graphics::image2d_handle atlas{};
  std::float_t atlas_width{0.0f};
  std::float_t atlas_height{0.0f};
  std::float_t line_height{1.0f};
  std::float_t sdf_px_range{2.0f};
  std::unordered_map<std::uint32_t, glyph> glyphs;
 
  [[nodiscard]] auto find_glyph(std::uint32_t codepoint) const -> memory::observer_ptr<const glyph>;
 
}; // struct font
 
[[nodiscard]] auto load_font(graphics::image2d_handle atlas, const std::filesystem::path& json_path) -> font;
 
} // namespace sbx::ui
 
#endif // LIBSBX_UI_FONT_HPP_