#include <utility>
#include <iostream>
#include "interlace.hh"

#include "opencv2/opencv.hpp"

void* Interlace::operator()(void* para)
{
  std::pair<cv::Mat*, cv::Mat*>* pair = (std::pair<cv::Mat*, cv::Mat*>*)para;
  cv::Mat* mat = pair->first;

  if (mat == nullptr)
    return nullptr;

  if (pair->second != nullptr)
  {
    for (size_t i = 0; i < mat->rows; ++i)
      for (size_t j = 0; j < mat->cols; ++j)
        if (i < pair->second->rows && j < pair->second->cols
          && (i + j) % 2 == 0)
        {
          mat->at<cv::Vec3b>(i, j)[0] = pair->second->at<cv::Vec3b>(i, j)[0];
          mat->at<cv::Vec3b>(i, j)[1] = pair->second->at<cv::Vec3b>(i, j)[1];
          mat->at<cv::Vec3b>(i, j)[2] = pair->second->at<cv::Vec3b>(i, j)[2];
        }

    delete pair->second;
  }

  delete pair;
  return mat;
}