aruco: fix non-square marker size in _drawPlanarBoardImpl

modules/aruco/src/aruco.cpp

@@ -1676,6 +1676,7 @@ void _drawPlanarBoardImpl(Board *_board, Size outSize, OutputArray _img, int mar
 
         // get marker
         Size dst_sz(outCorners[2] - outCorners[0]); // assuming CCW order
+        dst_sz.width = dst_sz.height = std::min(dst_sz.width, dst_sz.height); //marker should be square
         dictionary.drawMarker(_board->ids[m], dst_sz.width, marker, borderBits);
 
         if((outCorners[0].y == outCorners[1].y) && (outCorners[1].x == outCorners[2].x)) {

modules/aruco/test/test_misc.cpp

@@ -0,0 +1,24 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#include "test_precomp.hpp"
+#include <opencv2/aruco/charuco.hpp>
+
+TEST(CV_ArucoDrawMarker, regression_1226)
+{
+    int squares_x = 7;
+    int squares_y = 5;
+    int bwidth = 1600;
+    int bheight = 1200;
+
+    cv::Ptr<cv::aruco::Dictionary> dict = cv::aruco::getPredefinedDictionary(cv::aruco::DICT_4X4_50);
+    cv::Ptr<cv::aruco::CharucoBoard> board = cv::aruco::CharucoBoard::create(squares_x, squares_y, 1.0, 0.75, dict);
+    cv::Size sz(bwidth, bheight);
+    cv::Mat mat;
+
+    ASSERT_NO_THROW(
+    {
+        board->draw(sz, mat, 0, 1);
+    });
+}