base64.mjs

import proc from './proc.mjs'


/**
 * 圖片轉Base64字串
 *
 * @param {String} fpInp 輸入來源圖片位置字串
 * @param {String} ext 輸入目標格式字串
 * @param {Object} [opt={}] 輸入設定物件，含各種類編碼設定，預設{}
 * @return {Promise} 回傳Promise，resolve回傳成功訊息，reject回傳錯誤訊息
 * @example
 *
 * import fs from 'fs'
 * import _ from 'lodash-es'
 * import w from 'wsemi'
 * import wi from './src/WImageProc.mjs'
 *
 * let test = async () => {
 *
 *     let pre = ''
 *     let key = 'base64'
 *
 *     let ts = []
 *     _.each(['png', 'svg'], (extIn) => {
 *         _.each([
 *             {
 *                 ext: 'jpg',
 *             },
 *             {
 *                 ext: 'webp',
 *             },
 *             {
 *                 ext: 'png',
 *                 opt: {
 *                     compressionLevely: 5,
 *                 },
 *             },
 *         ], (o) => {
 *             ts.push({
 *                 in: {
 *                     ext: extIn,
 *                 },
 *                 out: {
 *                     ...o,
 *                 },
 *             })
 *         })
 *     })
 *
 *     await w.pmSeries(ts, async (t) => {
 *         // console.log('t', t)
 *         let fpIn = `./test/cocktail.${t.in.ext}`
 *         let fpOut = `./test/cocktail_${pre}_${key}[${t.in.ext}_to_${t.out.ext}].base64` //html
 *         let ext = t.out.ext
 *         let opt = {
 *             ..._.get(t, 'out.opt', {}),
 *         }
 *         let b64 = await wi.base64(fpIn, ext, opt)
 *         // b64 = `
 *         //     <img src="${b64}">
 *         // `
 *         fs.writeFileSync(fpOut, b64, 'utf8')
 *         console.log(t.in.ext, t.out.ext, 'ok')
 *     })
 *
 * }
 * await test()
 *     .catch((err) => {
 *         console.log(err)
 *     })
 *
 */
let base64 = async (fpInp, ext, opt = {}) => {
    let optExt = {
        ...opt,
        cropLeft: null, //移除
        cropTop: null, //移除
        cropWidth: null, //移除
        cropHeight: null, //移除
        // funGetWidth: null, //移除
        // funGetHeight: null, //移除
        // funGetSize: null, //移除
        returnBase64: true,
    }
    let r = await proc(fpInp, `${fpInp}.${ext}`, optExt)
    return r
}


export default base64