image.hpp

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#pragma once

 
#include <cstddef>
#include <cstdint>
#include <filesystem>
#include <span>
#include <vector>
 
#include "orrery/viz/tone_map.hpp"
 
namespace orrery::viz {

class Image {
public:
    static constexpr std::size_t kChannels = 3;
 
    Image() = default;

    Image(std::size_t width, std::size_t height);
 
    [[nodiscard]] std::size_t width() const noexcept { return width_; }
 
    [[nodiscard]] std::size_t height() const noexcept { return height_; }

    [[nodiscard]] std::span<const std::uint8_t> pixels() const noexcept { return pixels_; }
 
    [[nodiscard]] std::span<std::uint8_t> pixels() noexcept { return pixels_; }

    void set(std::size_t x, std::size_t y, std::uint8_t red, std::uint8_t green,
             std::uint8_t blue) noexcept;

    void write_ppm(const std::filesystem::path& path) const;
 
private:
    std::size_t width_ = 0;
    std::size_t height_ = 0;
    std::vector<std::uint8_t> pixels_;
};

void tone_map_into(Image& image, std::span<const float> radiance, ToneMapping mapping,
                   bool bottom_up);
 
} // namespace orrery::viz