import fs from 'fs'
import get from 'lodash-es/get.js'
import toLower from 'lodash-es/toLower.js'
import cloneDeep from 'lodash-es/cloneDeep.js'
import isnum from 'wsemi/src/isnum.mjs'
import isfun from 'wsemi/src/isfun.mjs'
import isbol from 'wsemi/src/isbol.mjs'
import ispm from 'wsemi/src/ispm.mjs'
import cint from 'wsemi/src/cint.mjs'
import haskey from 'wsemi/src/haskey.mjs'
import getFileNameExt from 'wsemi/src/getFileNameExt.mjs'
import fsIsFile from 'wsemi/src/fsIsFile.mjs'
import sharp from 'sharp'
import buf2b64 from './buf2b64.mjs'
/**
* 圖片處理
*
* @param {String} fpInp 輸入來源圖片位置字串
* @param {String} fpOut 輸入目標圖片位置字串
* @param {Object} [opt={}] 輸入設定物件，含各種類編碼設定，預設{}
* @param {Function} [opt.funGetWidth=null] 輸入指定圖片寬度函數，函數輸入會提供圖片metadata物件，預設null
* @param {Function} [opt.funGetHeight=null] 輸入指定圖片高度函數，函數輸入會提供圖片metadata物件，預設null
* @param {Function} [opt.funGetSize=null] 輸入指定圖片寬高度函數，函數輸入會提供圖片metadata物件，預設null
* @param {Integer} [opt.cropLeft=null] 輸入裁切左邊座標整數，單位px，預設null
* @param {Integer} [opt.cropTop=null] 輸入裁切上邊座標整數，單位px，預設null
* @param {Integer} [opt.cropWidth=null] 輸入裁切圖寬整數，單位px，預設null
* @param {Integer} [opt.cropHeight=null] 輸入裁切圖高整數，單位px，預設null
* @param {Integer} [opt.density=96] 輸入DPI整數，主要用於向量圖轉點陣圖，預設96
* @param {Boolean} [opt.returnBase64=false] 輸入是否回傳Base64字串布林值，預設false
* @return {Promise} 回傳Promise，resolve當returnBase64=false時回傳成功訊息，當returnBase64=true時回傳Base64字串，reject回傳錯誤訊息
* @example
*
* 詳見convert、resize、crop、base64範例
*
*/
let proc = async (fpInp, fpOut, opt = {}) => {
//注意sharp不能使用toFile須改使用fs讀寫buf, 否則會容易鎖死檔案
//check
if (!fsIsFile(fpInp)) {
throw new Error(`fpInp[${fpInp}] does not exist`)
}
//funGetWidth, funGetHeight, funGetSize
let funGetWidth = get(opt, 'funGetWidth')
let funGetHeight = get(opt, 'funGetHeight')
let funGetSize = get(opt, 'funGetSize')
//cropLeft, cropTop, cropWidth, cropHeight
let cropLeft = get(opt, 'cropLeft')
let cropTop = get(opt, 'cropTop')
let cropWidth = get(opt, 'cropWidth')
let cropHeight = get(opt, 'cropHeight')
//density
let density = get(opt, 'density')
if (!isnum(density)) {
density = 96 //96dpi與瀏覽器比例一致
}
density = cint(density)
//returnBase64
let returnBase64 = get(opt, 'returnBase64')
if (!isbol(returnBase64)) {
returnBase64 = false
}
//extOut
let extOut = getFileNameExt(fpOut)
extOut = toLower(extOut)
// console.log('extOut', extOut)
//bufIn
let bufIn = fs.readFileSync(fpInp)
//width, height
let width = null
let height = null
if (isfun(funGetSize) || isfun(funGetWidth) || isfun(funGetHeight)) {
//meta
let meta = await sharp(bufIn).metadata() //metadata()讀取後內部stream會被消耗, 不能再用於resize
if (isfun(funGetSize)) {
//funGetSize
let s = funGetSize(cloneDeep(meta))
if (ispm(s)) {
s = await s
}
//check
if (!isnum(get(s, 'width'))) {
throw new Error(`invalid ret.width for funGetSize`)
}
if (!isnum(get(s, 'height'))) {
throw new Error(`invalid ret.height for funGetSize`)
}
width = cint(s.width)
height = cint(s.height)
}
else if (isfun(funGetWidth)) {
//funGetWidth
width = funGetWidth(cloneDeep(meta))
if (ispm(width)) {
width = await width
}
width = cint(width)
}
else if (isfun(funGetHeight)) {
//funGetHeight
height = funGetHeight(cloneDeep(meta))
if (ispm(height)) {
height = await height
}
height = cint(height)
}
}
//img
let img = await sharp(bufIn, { density })
let bProcWidth = isnum(width)
let bProcHeight = isnum(height)
let bProcCrop = isnum(cropLeft) && isnum(cropTop) && isnum(cropWidth) && isnum(cropHeight)
if (bProcWidth && bProcHeight) {
//resize
img = img.resize({
width,
height,
withoutEnlargement: true, //拒絕放大圖片
})
}
else if (bProcWidth && !bProcHeight) {
//resize
img = img.resize({
width, //等比例縮放
withoutEnlargement: true, //拒絕放大圖片
})
}
else if (!bProcWidth && bProcHeight) {
//resize
img = img.resize({
height, //等比例縮放
withoutEnlargement: true, //拒絕放大圖片
})
}
if (bProcCrop) {
//cint
cropLeft = cint(cropLeft)
cropTop = cint(cropTop)
cropWidth = cint(cropWidth)
cropHeight = cint(cropHeight)
//extract
img = img.extract({
left: cropLeft,
top: cropTop,
width: cropWidth,
height: cropHeight,
})
}
//kpFormat
let kpFormat = {
png: () => img.png({
compressionLevel: 9, // 範圍 0–9
adaptiveFiltering: false,
palette: false, // 是否使用 palette（會變成8-bit）
quality: 100, // palette=true 才有用
colors: 256, // palette=true 才有用
...opt,
}),
jpg: () => img.flatten({ background: get(opt, 'background', '#fff') }).jpeg({
quality: 100, // 1–100
progressive: false,
chromaSubsampling: '4:2:0',
optimiseCoding: true, // 有助於壓縮
mozjpeg: false,
overshootDeringing: false,
...opt,
}),
jpeg: () => img.flatten({ background: get(opt, 'background', '#fff') }).jpeg({
quality: 100, // 1–100
progressive: false,
chromaSubsampling: '4:2:0',
optimiseCoding: true, // 有助於壓縮
mozjpeg: false,
overshootDeringing: false,
...opt,
}),
webp: () => img.webp({
quality: 100,
alphaQuality: 100, // 透明通道品質
lossless: true, // 無損支援透明
...opt,
}),
avif: () => img.avif({
quality: 50, // 1–100
lossless: false,
speed: 5, // 0–9 (0 最慢最好)
chromaSubsampling: '4:2:0',
...opt,
}),
gif: () => img.gif({
effort: 7, // 1–10 (壓縮努力程度)
interlace: false,
...opt,
}),
tiff: () => img.tiff({
quality: 100,
compression: 'jpeg', // 預設是 JPEG 壓縮的 TIFF
predictor: 'horizontal',
pyramid: false,
tile: false,
...opt,
}),
bmp: () => img.bmp({
...opt,
}),
}
//toFormat
if (haskey(kpFormat, extOut)) {
img = kpFormat[extOut]()
}
else {
img = img.toFormat(extOut)
}
//bufOut
let bufOut = await img.toBuffer()
//returnBase64
if (returnBase64) {
//pb64
let pb64 = buf2b64(bufOut, extOut)
// console.log('b64', b64)
return pb64
}
//writeFileSync
fs.writeFileSync(fpOut, bufOut)
return 'ok'
}
export default proc