bgr15.hpp

Go to the documentation of this file.

#pragma once
 
#include <cstdint>
#include <string>
 
namespace porytiles {
 
class Bgr15 {
    std::uint8_t red_;
    std::uint8_t green_;
    std::uint8_t blue_;
 
  public:
    constexpr Bgr15() : red_{0}, green_{0}, blue_{0} {}
 
    constexpr Bgr15(const std::uint8_t red, const std::uint8_t green, const std::uint8_t blue) {
        // Class invariant: color channels always have the 3 LSBs unset
        red_ = (red >> 3) << 3;
        green_ = (green >> 3) << 3;
        blue_ = (blue >> 3) << 3;
    }
 
    [[nodiscard]] std::uint8_t red() const {
        return red_;
    }
 
    [[nodiscard]] std::uint8_t green() const {
        return green_;
    }
 
    [[nodiscard]] std::uint8_t blue() const {
        return blue_;
    }
 
    auto operator<=>(const Bgr15 &) const = default;
 
    [[nodiscard]] std::uint16_t Pack() const;
 
    [[nodiscard]] std::string ToJascStr() const;
 
    [[nodiscard]] static Bgr15 Unpack(std::uint16_t packed_bgr);
 
    // friend std::ostream &operator<<(std::ostream &os, const Bgr15 &bgr);
};
 
inline auto format_as(const Bgr15 &bgr) {
    return bgr.ToJascStr();
}
 
} // namespace porytiles
 
template <>
struct std::hash<porytiles::Bgr15> {
    std::size_t operator()(const porytiles::Bgr15 &bgr) const noexcept {
        return std::hash<uint16_t>{}(bgr.Pack());
    }
};