less duplicate code

include/genimg/methods.hh

@@ -4,6 +4,33 @@
 #include <opencv2/core/core.hpp>
 #include <opencv2/highgui/highgui.hpp>
 #include <spdlog/spdlog.h>
+#include <tuple>
+#include <vector>
+
+namespace methods_private {
+
+[[nodiscard]] auto randomColor();
+[[nodiscard]] auto getColorSet(cv::Mat const& t_reference);
+[[nodiscard]] auto getSquareValues(cv::Mat const& t_img);
+[[nodiscard]] auto createCandidate(
+    cv::Mat const& t_base,
+    cv::Mat const& t_ref,
+    std::vector<std::array<uchar, 3>> const& t_colors,
+    double const diff,
+    bool const t_controlled_size);
+void adjustSize(cv::Mat const& t_process_img,
+                cv::Point& t_top_left,
+                int t_size);
+void threadedGetColor(cv::Mat const& t_reference,
+                      std::vector<std::array<uchar, 3>>& t_colors,
+                      int t_h);
+void newSquare1(cv::Mat& t_process_img, cv::Point&& t_top_left, int t_size);
+void newSquare2(cv::Mat& t_process_img,
+                cv::Point&& t_top_left,
+                int t_size,
+                std::array<uchar, 3> const& t_color);
+
+}  // namespace methods_private
 
 void method1(cv::Mat const&, cv::Mat&, int);