compress-base64/dist/cjs/index.js

compress base64

/**
* compress-base64 v7.0.10 by sunsilent
* @license MIT
**/
"use strict";
var __webpack_require__ = {};
(()=>{
    __webpack_require__.d = function(exports1, definition) {
        for(var key in definition)if (__webpack_require__.o(definition, key) && !__webpack_require__.o(exports1, key)) Object.defineProperty(exports1, key, {
            enumerable: true,
            get: definition[key]
        });
    };
})();
(()=>{
    __webpack_require__.o = function(obj, prop) {
        return Object.prototype.hasOwnProperty.call(obj, prop);
    };
})();
(()=>{
    __webpack_require__.r = function(exports1) {
        if ('undefined' != typeof Symbol && Symbol.toStringTag) Object.defineProperty(exports1, Symbol.toStringTag, {
            value: 'Module'
        });
        Object.defineProperty(exports1, '__esModule', {
            value: true
        });
    };
})();
var __webpack_exports__ = {};
__webpack_require__.r(__webpack_exports__);
__webpack_require__.d(__webpack_exports__, {
    default: function() {
        return compress;
    }
});
const step = 0.001;
function compress(base64, options) {
    const { type = 'image/jpeg', width, height, min = 0, max = 200, crossOrigin, quality } = options;
    return new Promise((resolve, reject)=>{
        let tq = quality || 0.8;
        const img = new Image();
        img.src = base64;
        if ('string' == typeof crossOrigin) img.setAttribute('crossOrigin', crossOrigin);
        let tw = width;
        let th = height;
        img.onload = ()=>{
            if (isNaN(tw) && isNaN(th)) {
                tw = img.width;
                th = img.height;
            } else {
                if (!isNaN(tw) && isNaN(th)) th = tw * img.height / img.width;
                if (isNaN(tw) && !isNaN(th)) tw = th * img.width / img.height;
            }
            img.width = tw;
            img.height = th;
            const canvas = document.createElement('canvas');
            const ctx = canvas.getContext('2d');
            canvas.width = tw;
            canvas.height = th;
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
            let base64 = canvas.toDataURL(type, tq);
            while(base64.length / 1024 > max){
                if (tq <= step) {
                    base64 = canvas.toDataURL(type, step);
                    break;
                }
                tq -= step;
                base64 = canvas.toDataURL(type, tq);
            }
            while(base64.length / 1024 < min){
                tq += step;
                base64 = canvas.toDataURL(type, tq);
            }
            resolve(base64);
        };
        img.onerror = (error)=>{
            reject(error);
        };
    });
}
var __webpack_export_target__ = exports;
for(var __webpack_i__ in __webpack_exports__)__webpack_export_target__[__webpack_i__] = __webpack_exports__[__webpack_i__];
if (__webpack_exports__.__esModule) Object.defineProperty(__webpack_export_target__, '__esModule', {
    value: true
});