shape_mask.hpp

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#pragma once
 
#include <array>
#include <cstdint>
 
#include "porytiles/domain/models/pixel_tile.hpp"
 
namespace porytiles {
 
class ShapeMask {
  public:
    ShapeMask() = default;
 
    explicit ShapeMask(const std::array<uint8_t, tile::side_length_pix> &rows) : rows_{rows} {}
 
    // (lexicographic on rows array)
    auto operator<=>(const ShapeMask &) const = default;
 
    [[nodiscard]] ShapeMask flip(bool h, bool v) const;
 
    void set(std::size_t row, std::size_t col);
 
    void unset(std::size_t row, std::size_t col);
 
    [[nodiscard]] bool get(std::size_t row, std::size_t col) const;
 
    [[nodiscard]] bool is_transparent() const;
 
    [[nodiscard]] const std::array<uint8_t, 8> &rows() const
    {
        return rows_;
    }
 
  private:
    std::array<uint8_t, tile::side_length_pix> rows_{};
};
 
} // namespace porytiles
 
template <>
struct std::hash<porytiles::ShapeMask> {
    size_t operator()(const porytiles::ShapeMask &tm) const noexcept
    {
        // Simple hash combining all 8 bytes
        size_t h = 0;
        for (const uint8_t byte : tm.rows()) {
            h = h * 31 + byte;
        }
        return h;
    }
};