pretty-automata/src/colormaps/colormaps.h

#ifndef SHADER_AUTOMATON_COLORMAPS_H
#define SHADER_AUTOMATON_COLORMAPS_H
#include "../color.h"
#include <map>

struct ColorMapData {
private:
  std::vector<float> data_{};
  size_t size_{};
  ColorSpace color_space_{};

public:
  ColorMapData() : color_space_(ColorSpace::CIELAB) {}
  explicit ColorMapData(const std::vector<Color>& colors) {
    size_ = colors.size();
    data_ = std::vector<float>(size_ * 3);
    size_t i = 0;
    for (const auto &item : colors) {
      data_[i++] = static_cast<float>(item.v1);
      data_[i++] = static_cast<float>(item.v2);
      data_[i++] = static_cast<float>(item.v3);
    }
  }

  static ColorMapData fromArray(const float *data, size_t num_colors, std::optional<ColorSpace> color_space) {
    ColorMapData cmd{};
    if (color_space.has_value()) {
      cmd.color_space_ = color_space.value();
      cmd.data_.assign(data, data + num_colors * 3);
    } else {
      cmd.data_ = std::vector<float>(num_colors * 3);
      for (size_t i = 0; i < num_colors; ++i) {
        auto c = Color::from_normalized_rgb(data[i * 3], data[i * 3 + 1], data[i * 3 + 2]);
        cmd.data_[i * 3] = static_cast<float>(c.v1);
        cmd.data_[i * 3 + 1] = static_cast<float>(c.v2);
        cmd.data_[i * 3 + 2] = static_cast<float>(c.v3);
      }
    }
    cmd.size_ = num_colors;
    return cmd;
  }

public:
  [[nodiscard]] size_t size() const {
    return size_;
  }

  [[nodiscard]] const float *data() const {
    return data_.data();
  }
};



extern const std::map<std::string, ColorMapData> colormaps;


#endif // SHADER_AUTOMATON_COLORMAPS_H