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OpenCV-Erlang/Elixir binding.

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evision c_src modules evision_backend round.h
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c_src/modules/evision_backend/round.h 

#ifndef EVISION_BACKEND_ROUND_H

#define EVISION_BACKEND_ROUND_H



#include <erl_nif.h>

#include "../../ArgInfo.hpp"



// @evision c: mat_round, evision_cv_mat_round, 1

// @evision nif: def mat_round(_opts \\ []), do: :erlang.nif_error(:undefinedined)

static ERL_NIF_TERM evision_cv_mat_round(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {

    using namespace cv;

    ERL_NIF_TERM error_term = 0;

    std::map<std::string, ERL_NIF_TERM> erl_terms;

    int nif_opts_index = 0;

    evision::nif::parse_arg(env, nif_opts_index, argv, erl_terms);



    {

        Mat img;



        if (evision_to_safe(env, evision_get_kw(env, erl_terms, "img"), img, ArgInfo("img", 0))) {

            int type = img.type();

            uint8_t depth = type & CV_MAT_DEPTH_MASK;

            if (depth == CV_32F) {

                auto ptr = img.ptr<float>();

                size_t count = img.total();

                for (size_t i = 0; i < count; ++i) {

                    ptr[i] = roundf(ptr[i]);

                }

                return evision_from(env, img);

            } else if (depth == CV_64F) {

                auto ptr = img.ptr<double>();

                size_t count = img.total();

                for (size_t i = 0; i < count; ++i) {

                    ptr[i] = round(ptr[i]);

                }

                return evision_from(env, img);

            } else {

                return evision_from(env, img);

            }

        }

    }



    if (error_term != 0) return error_term;

    else return enif_make_badarg(env);

}



#endif // EVISION_BACKEND_ROUND_H