util-helpers/lib/getImageInfo.js

一个基于业务场景的工具方法库

'use strict';

var ut2 = require('ut2');
var divide = require('./divide.js');
var gcd = require('./gcd.js');
var loadImageWithBlob = require('./loadImageWithBlob.js');
var bytesToSize = require('./bytesToSize.js');

function calcContrast(w, h) {
    var n = gcd(w, h);
    return "".concat(divide(ut2.round(w), n), ":").concat(divide(ut2.round(h), n));
}
function getImageInfo(img, ajaxOptions) {
    return loadImageWithBlob(img, ajaxOptions).then(function (_a) {
        var image = _a.image, blob = _a.blob;
        var width = image.width, height = image.height;
        return {
            width: width,
            height: height,
            contrast: calcContrast(width, height),
            measure: "".concat(width, " \u00D7 ").concat(height, " px"),
            size: bytesToSize(blob.size),
            bytes: blob.size,
            image: image,
            blob: blob
        };
    });
}

module.exports = getImageInfo;