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1. convert cv::Mat to CvMat

cv::Mat img = ...;

CvMat des_img(img);

2. convert CvMat to Gdk::Pixbuf

auto img_buf = Gdk::Pixbuf::create_from_data(des_img.data.ptr, Gdk::COLORSPACE_RGB, false, 8, des_img.rows, des_img.cols, des_img.step)

NOTE: CvMat is defined in opencv2/core/types_c.h header file. It may work...

1. convert cv::Mat to CvMatCvMat:

cv::Mat img = ...;
...;
  
 CvMat des_img(img);des_img(img);

auto img_buf = Gdk::Pixbuf::create_from_data(des_img.data.ptr, Gdk::COLORSPACE_RGB, false, 8, des_img.rows, des_img.cols, des_img.step)
des_img.step)