How to convert OpenCV Mat to SoftwareBitmap with C++/WinRT

CvMat2SoftwareBitmap.cpp

#include "pch.h"
#include <winrt/Windows.Security.Cryptography.h>
using namespace winrt;
using namespace winrt::Windows::Storage::Streams;
using namespace winrt::Windows::Graphics::Imaging;
using namespace std;

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;

int main()
{
  init_apartment();
  
  Mat bgr_image = imread("test_img.bmp", IMREAD_COLOR);
  
  // Add alpha channel
  Mat image(bgr_image.size(), CV_8UC4);
  Mat alpha(bgr_image.size(), CV_8UC1, 255);
  Mat image_in[] = { bgr_image, alpha };
  int from_to[] = { 0,0, 1,1, 2,2, 3,3 };
  mixChannels(image_in, 2, &image, 1, from_to, 4);
  
  // Convert image data to byte array
  vector<uchar> array;
  if (image.isContinuous()) {
      array.assign(image.data, image.data + image.total() * image.channels());
  }
  else {
      for (int i = 0; i < image.rows; ++i) {
          array.insert(array.end(), image.ptr<uchar>(i), image.ptr<uchar>(i) + image.cols * image.channels());
      }
  }
  
  // Convert byte array to SoftwareBitmap
  IBuffer buffer = CryptographicBuffer::CreateFromByteArray( array );
  SoftwareBitmap softwareBitmap = SoftwareBitmap::CreateCopyFromBuffer(buffer, BitmapPixelFormat::Bgra8, image.cols, image.rows);
}