main.cpp

#include <emscripten.h>
#include <emscripten/bind.h>
#include <emscripten/val.h>
#include <opencv2/objdetect/aruco_board.hpp>
#include <opencv2/opencv.hpp>


extern "C" int main(int argc, char **argv) {
    return 0;
}

emscripten::val createChArUco() {
    cv::Mat raw;
    cv::Mat output;
    
    auto dictionary = cv::aruco::getPredefinedDictionary(cv::aruco::DICT_6X6_250);
    cv::aruco::CharucoBoard board = cv::aruco::CharucoBoard(cv::Size(5, 7), 0.04f, 0.02f, dictionary);
    board.generateImage(cv::Size(200, 280), raw);
    cv::cvtColor(raw, output, cv::COLOR_GRAY2RGBA);

    emscripten::val Uint8Array = emscripten::val::global("Uint8Array");

    emscripten::memory_view<unsigned char> view = emscripten::typed_memory_view(output.total() * output.elemSize(), output.data);

    emscripten::val dataCopy = Uint8Array.new_(view);

    emscripten::val result = emscripten::val::object();
    result.set("width", output.cols);
    result.set("height", output.rows);
    result.set("channels", output.channels());
    result.set("data", dataCopy);

    return result;
}

EMSCRIPTEN_BINDINGS(my_module) {
    emscripten::function("createChArUco", &createChArUco);
}