compress-picture-js/dist/service/compress/compress_png.service.js

图片压缩工具

import { responseUtil } from '../../util/response/response.util.js';
import { CreateDirSyncFromFilename, ReadFileSync, WriteFileSync, } from '../../util/file/file.util.js';
import pnglib from 'upng-js';
// CompressPNG 压缩PNG
export function CompressPNG(options) {
    let resp = responseUtil.DefaultIResponse();
    // console.log("🚀", options);
    // 图片
    const imgBuffer = ReadFileSync(options['input']);
    const img = pnglib.decode(imgBuffer);
    const rgba = pnglib.toRGBA8(img);
    // 压缩比例：cnum = Or just use 0 for lossless / 256 for lossy.
    const compressQuality = pngCompressQuality(options['quality']);
    // console.log("🚀", compressQuality)
    const pngImg = pnglib.encode(rgba, img.width, img.height, compressQuality);
    // 检查输出文件夹
    CreateDirSyncFromFilename(options['output']);
    // 写文件
    WriteFileSync(options['output'], pngImg);
    return resp;
}
// pngCompressQuality png压缩质量
function pngCompressQuality(quality) {
    if (quality < 0 || quality >= 100) {
        return 0;
    }
    return Math.ceil((256 * (100 - quality)) / 100);
}