/******************************************
 * détection de visages avec openCV
 ******************************************/
function onOpenCvReady() {
    console.info('OpenCV.js est chargé !');
    document.getElementById('status').remove()

}

function detection_de_visages() {
    src = cv.imread(ima_fond);
    gray = new cv.Mat();
    cv.cvtColor(src, gray, cv.COLOR_RGBA2GRAY, 0);
    chargement_haarcascade();
}

function chargement_haarcascade() {
    let reader_haar = new FileReader();
    reader_haar.onload = function (ev) {
        function str2ab(text) {
            return new TextEncoder().encode(text);
        }

        faceCascadeFile = fichier_xml.name;
        let data = str2ab(reader_haar.result)
        cv.FS_createDataFile('/', faceCascadeFile, data, true, false, false);
        detect_faces();
    };
    reader_haar.readAsText(fichier_xml);
}

function detect_faces() {

    let faces = new cv.RectVector();
    let faceCascade = new cv.CascadeClassifier();
// load pre-trained classifiers
    faceCascade.load(faceCascadeFile);
// detect faces
    let msize = new cv.Size(0, 0);
    faceCascade.detectMultiScale(gray, faces, 1.1, 3, 0, msize, msize);
    console.log("Il y a " + faces.size() + " visage(s)")
    for (let i = 0; i < faces.size(); ++i) {
        ajouter_personne_xml("nom_" + parseInt(i) + " ", faces.get(i).x, faces.get(i).y, faces.get(i).width, faces.get(i).height)
    }
    src.delete();
    gray.delete();
    faceCascade.delete();
    faces.delete();
    lecture_xml();

    ;
}