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OpenCV-Erlang/Elixir binding.

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evision c_src modules evision_backend predicate.h
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c_src/modules/evision_backend/predicate.h 

#ifndef EVISION_BACKEND_PREDICATE_H

#define EVISION_BACKEND_PREDICATE_H



#include <cmath>

#include <erl_nif.h>

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

#include "../evision_mat_utils.hpp"

#include "parallel.h"



// Elementwise predicate -> u8 {0,1} (Nx.is_nan / is_infinity / logical_not).

// op 0 = is_nan, 1 = is_infinity, 2 = is_zero (logical_not). The nan/inf checks go

// through double, so integer inputs are always finite (0); f16/bf16 are widened to

// f32 by the caller, so only real C types reach here. Output is a flat [1, n] u8

// mat the caller reshapes to the input shape.

template <typename T>

static void evision_predicate(const cv::Mat &src, cv::Mat &dst, int op) {

    const T *sp = (const T *)src.data;

    unsigned char *dp = dst.data;

    size_t n = src.total();

    evision_parallel_for((int64_t)n, (int64_t)n, EVISION_PARALLEL_SIMPLE_MIN_WORK, [&](int64_t begin, int64_t end) {

        for (int64_t i = begin; i < end; i++) {

            T x = sp[(size_t)i];

            unsigned char r = 0;

            switch (op) {

                case 0: r = std::isnan((double)x) ? 1 : 0; break;

                case 1: r = std::isinf((double)x) ? 1 : 0; break;

                case 2: r = (x == (T)0) ? 1 : 0; break;

                default: break;

            }

            dp[(size_t)i] = r;

        }

    });

}



// @evision c: mat_predicate, evision_cv_mat_predicate, 1

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

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

    using namespace cv;

    using namespace evision::nif;

    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 src;

        int op = 0;



        if (evision_to_safe(env, evision_get_kw(env, erl_terms, "src"), src, ArgInfo("src", ArgInfo::INPUT_ONLY)) &&

            evision_to_safe(env, evision_get_kw(env, erl_terms, "op"), op, ArgInfo("op", 0))) {

            Mat src_c = src.isContinuous() ? src : src.clone();

            Mat dst(1, (int)src_c.total(), CV_8U);

            switch (src_c.depth()) {

                case CV_8U:  evision_predicate<uint8_t>(src_c, dst, op); break;

                case CV_8S:  evision_predicate<int8_t>(src_c, dst, op); break;

                case CV_16U: evision_predicate<uint16_t>(src_c, dst, op); break;

                case CV_16S: evision_predicate<int16_t>(src_c, dst, op); break;

                case CV_32S: evision_predicate<int32_t>(src_c, dst, op); break;

                case CV_32U: evision_predicate<uint32_t>(src_c, dst, op); break;

                case CV_64S: evision_predicate<int64_t>(src_c, dst, op); break;

                case CV_64U: evision_predicate<uint64_t>(src_c, dst, op); break;

                case CV_32F: evision_predicate<float>(src_c, dst, op); break;

                case CV_64F: evision_predicate<double>(src_c, dst, op); break;

                default: return evision::nif::error(env, "mat_predicate: unsupported depth");

            }

            return evision_from(env, dst);

        }

    }



    return enif_make_badarg(env);

}



#endif // EVISION_BACKEND_PREDICATE_H