generate and show qr code

utils/utils.cpp

@@ -5,6 +5,10 @@
 #include <cstring>
 #include <iostream>
 #include <locale>
+#include <opencv2/core/mat.hpp>
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/imgproc.hpp>
+#include <qrencode.h>
 #include <regex>
 #include <string>
 #include "../exceptions/ofdrequestexception.h"
@@ -13,6 +17,7 @@
 #include <fstream>
 #include <ifaddrs.h>
 #include <netinet/in.h>
+#include <opencv2/opencv.hpp>
 
 std::string get_local_ip_address() {
     struct ifaddrs * ifAddrStruct=NULL;
@@ -214,3 +219,28 @@ Check parseOfdRuAnswer(std::string html) {
 
     return c;
 }
+
+void generate_qr_code(std::string data) {
+    QRcode *qrCode = QRcode_encodeString(data.c_str(), 2, QR_ECLEVEL_L, QR_MODE_8,  1);
+    if (qrCode == NULL) {
+        std::cerr << "Error on generating qr code" << std::endl;
+    }
+
+    cv::Mat qrCodeImage = cv::Mat::zeros(qrCode->width, qrCode->width, CV_8UC3);
+
+    for (int y = 0; y < qrCode->width; y++) {
+        for (int x = 0; x < qrCode->width; x++) {
+            cv::rectangle(
+                qrCodeImage,
+                cv::Point(x, y),
+                cv::Point(x + 1, y + 1),
+                ((qrCode->data[y * qrCode->width + x] & 1) ?
+                     cv::Scalar(255., 255., 255.) : cv::Scalar(0., 0., 0.)
+                ),
+                -1
+            );
+        }
+    }
+    cv::imwrite(get_path_relative_to_home(".local/share/checks_parser/binaryeye_connection.png"), qrCodeImage);
+    QRcode_free(qrCode);
+}

utils/utils.h

@@ -20,4 +20,6 @@ Check parseOfdRuAnswer(std::string);
 
 std::wstring trim_html_response(std::wstring& check);
 
+void generate_qr_code(std::string data);
+
 #endif // UTILS_H