seinjs-png-compress-processor/index.js

Compress png files with webpack loaders for Sein.js.

"use strict";
/**
 * @File   : index.ts
 * @Author : dtysky (dtysky@outlook.com)
 * @Date   : 11/18/2019, 3:54:07 PM
 * @Description:
 */
var PNG = require("upng-js");
function debug(msg) {
    if (process.env.SEINJS_LOADER_DEBUG) {
        console.log('seinjs-png-compress-processor', msg);
    }
}
module.exports = /** @class */ (function () {
    function SeinJSPNGCompressProcessor(options) {
        this._psize = 256;
        if (options) {
            this.test = options.test || /\.png/g;
            this._psize = options.psize || 256;
            this._custom = options.custom || null;
        }
    }
    SeinJSPNGCompressProcessor.prototype.process = function (options) {
        var _this = this;
        return new Promise(function (resolve) {
            var data = options.data, filePath = options.filePath;
            if (!(data instanceof Buffer)) {
                data = new Buffer(data);
            }
            var cpOptions = { psize: _this._psize, skip: false };
            if (_this._custom) {
                Object.assign(cpOptions, _this._custom(filePath, data) || {});
            }
            debug(filePath + ", " + JSON.stringify(cpOptions));
            if (cpOptions.skip) {
                console.log("PNG Compress skip: " + filePath);
            }
            else {
                try {
                    var png = PNG.decode(data);
                    var res = PNG.encode([PNG.toRGBA8(png)[0]], png.width, png.height, cpOptions.psize);
                    data = Buffer.from(res);
                    console.log("PNG Compress success: " + filePath);
                }
                catch (error) {
                    console.error("PNG Compress error: file " + filePath + ", " + error.message);
                }
            }
            resolve(data);
        });
    };
    return SeinJSPNGCompressProcessor;
}());