font.hpp

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#pragma once
 
#include <cstddef>
#include <cstdint>
#include <span>
 
namespace epaper {
 
struct FontMetrics {
  std::uint16_t width;
  std::uint16_t height;
};
 
class Font {
public:
  constexpr Font(const std::uint8_t *table, std::uint16_t width, std::uint16_t height)
      : table_(table), width_(width), height_(height) {}
 
  [[nodiscard]] constexpr auto metrics() const noexcept -> FontMetrics { return {.width = width_, .height = height_}; }
 
  [[nodiscard]] constexpr auto width() const noexcept -> std::uint16_t { return width_; }
 
  [[nodiscard]] constexpr auto height() const noexcept -> std::uint16_t { return height_; }
 
  [[nodiscard]] auto char_data(char c) const -> std::span<const std::uint8_t>;
 
  [[nodiscard]] constexpr auto bytes_per_char() const noexcept -> std::size_t {
    const auto width_bytes = static_cast<std::size_t>((width_ % 8 == 0) ? (width_ / 8) : ((width_ / 8) + 1));
    return width_bytes * static_cast<std::size_t>(height_);
  }
 
  // Factory methods for built-in fonts
  static auto font8() -> const Font &;
 
  static auto font12() -> const Font &;
 
  static auto font16() -> const Font &;
 
  static auto font20() -> const Font &;
 
  static auto font24() -> const Font &;
 
private:
  const std::uint8_t *table_;
  std::uint16_t width_;
  std::uint16_t height_;
};
 
} // namespace epaper