// ==UserScript==
// @name         图片在线压缩
// @namespace    ༺黑白༻
// @version      1.6
// @description  select img to zip!
// @author       Paul
// @match        *://www.baidu.com/
// @require      https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/layer/2.3/layer.js
// @grant        GM_addStyle
// @run-at       document-end
// ==/UserScript==
(function () {
'use strict';
({
reader: null,
loadImg: null,
canvas: null,
context: null,
$body: null,
itemTotalCount:0,
createCss: function () {
$(document.head).append('<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/layer/2.3/skin/layer.css"/>');
GM_addStyle('.zipcontainer{ position:fixed;width:60px;height:35px;line-height:35px;right: 0;font-size: 12px;top: 50%;transform: translateY(-50%);z-index: 1;cursor: pointer;border-radius: .4em;overflow: hidden;background-color: #38f;color:#fff; }\
.zipcontainer .zipbtn{ display:block; text-align:center;width:100%;height:100%; }\
.zipcontainer .zipfile{display:block; position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;z-index:-1; }\
.maxImg{ max-height:100%;max-width:100%; }\
.cfg_progress{ width:550px;display:block;height: 30px;line-height: 30px;margin-bottom:10px; }\
.cfg_progress .cfg_progress_label{ width:70px;display:inline-block;float: left; }\
.cfg_progress .cfg_progress_bar{ width:450px;display:inline-block;margin-left:15px;height: 30px; }\
.cfg_progress .cfg_progress_bar span{ background-color:#C1E1FC;width:0;height:100%;display:block;text-align:center;}\
.cfg_imgs{ width:550px;height:300px;overflow-y:auto;margin-top:5px; }\
.cfg_imgs .img_item{ float:left;width:115px;margin:3px 3px;border:1px solid #ccc;background-color:#dbdbdb; }\
.cfg_imgs .img_item:nth-child(4n-3){margin-left:7px;}\
.cfg_imgs .img_item:nth-child(4n){margin-right:7px;}\
.cfg_imgs .img_item .img{ height:135px;width:115px;vertical-align: middle;display:table-cell; }\
.cfg_imgs .img_item .img img{max-height:100%;max-width:100%;margin:0 auto;display:block;}\
.cfg_imgs .img_item .text{ text-align:center;display:block;line-height:25px;background-color:#fff; }');
return this;
},
createBtn: function () {
var htmlStr = '<div class="zipcontainer"><span class="zipbtn">图片压缩</span><input accept="image/*" type="file" multiple class="zipfile" /></div>';
this.$container = $(htmlStr).appendTo(this.$body);
return this;
},
createProcessWin: function () {
layer.open({
type: 1,
area:['610px','auto'],
title: '脚本定制可联系：[email protected]',
content: '<div style="margin: 20px;font-size:13px;">\
<div class="cfg_progress">\
<div class="cfg_progress_label">压缩进度:</div>\
<div class="cfg_progress_bar"><span id="itemCount">0%</span></div>\
</div>\
<div class="cfg_imgs" id="zipImgs"></div>\
</div>\
',
shade: false,
success: function (layero, index) {
this.$itemCount = layero.find('#itemCount');
this.$zipImgs = layero.find('#zipImgs');
this.$body.off('item_progress').on('item_progress', function (e, cur, total,imgSrc,originSize,afterZipSize) {
var progress = Math.round(cur / total * 100);
progress = progress + '%';
this.$itemCount.css('width', progress).html(progress);
this.$zipImgs.append('<div class="img_item"><div class="img"><img src="' + imgSrc + '"  /></div><span class="text">'+this.computeSize(originSize)+' -> '+this.computeSize(afterZipSize)+'</span><a class="text" href="' + imgSrc +'" download="img" >下载</a></div>');
}.bind(this));
}.bind(this),
end: function () {
this.$container.show();
}.bind(this)
})
},
computeSize:function(size){
var prefix='B',cSize=size;
if(size>####){
prefix='KB';
cSize = Math.ceil(size/####);
if(size>####*####){
prefix='MB';
cSize = Math.ceil(size/(####*####));
}
}
return cSize+prefix;
},
initEvent: function () {
this.$container.children('span:first').on('click', function (e) { var $this = $(this); $this.next().click(); }).end().children('input:first').on('change', this.onChange.bind(this));
return this;
},
onReadFile: function (e) {
this.loadImg.src = e.target.r###lt;
},
onImgLoad: function (dfd,originSize,e) {
// 图片原始尺寸
var originWidth = this.loadImg.width;
var originHeight = this.loadImg.height;
// 最大尺寸限制，可通过国设置宽高来实现图片压缩程度
var maxWidth = 800,
maxHeight = 800;
// 目标尺寸
var targetWidth = originWidth,
targetHeight = originHeight;
// 图片尺寸超过400x400的限制
//if (originWidth > maxWidth || originHeight > maxHeight) {
//    if (originWidth / originHeight > maxWidth / maxHeight) {
//        // 更宽，按照宽度限定尺寸
//        targetWidth = maxWidth;
//        targetHeight = Math.round(maxWidth * (originHeight / originWidth));
//    } else {
//        targetHeight = maxHeight;
//        targetWidth = Math.round(maxHeight * (originWidth / originHeight));
//    }
//}
// canvas对图片进行缩放
this.canvas.width = targetWidth;
this.canvas.height = targetHeight;
// 清除画布
this.context.clearRect(0, 0, targetWidth, targetHeight);
// 图片压缩
this.context.drawImage(this.loadImg, 0, 0, targetWidth, targetHeight);
/*第一个参数是创建的img对象；第二个参数是左上角坐标，后面两个是画布区域宽高*/
//压缩后的图片base64 url
/*canvas.toDataURL(mimeType, qualityArgument),mimeType 默认值是'image/jpeg';
* qualityArgument表示导出的图片质量，只要导出为jpg和webp格式的时候此参数才有效果，默认值是0.92*/
/* this.canvas.toBlob(function(){
console.log(arguments);
},'image/jpeg',0.80);
var newUrl = this.canvas.toDataURL('image/jpeg', 0.80);//base64 格式
//console.log(canvas.toDataURL('image/jpeg', 0.92));
dfd.resolve(newUrl); */
var quality=0.75,formart='image/jpeg';
this.canvas.toBlob(function(blob){
dfd.resolve(this.canvas.toDataURL(formart, quality),originSize,blob.size);
}.bind(this),formart,quality);
},
onChange: function (e) {
var i,file,len,filesArray=[],
files = e.target.files;
len = files.length;
if (len <= 0) {
layer.msg("请选择要压缩的图片！");
} else {
for (i = 0; i < len; i++) {
file = files[i];
if (file.type.indexOf("image") == 0) {
filesArray.push(file);
}
}
}
this.itemTotalCount = filesArray.length;
if (this.itemTotalCount > 0) {
this.$container.hide();
this.createProcessWin();
setTimeout(this.doFilesQueue.bind(this, filesArray,0), 100);
}
e.target.value='';
},
doLoad: function (file) {
var dfd = $.Deferred();
this.loadImg.onload = this.onImgLoad.bind(this, dfd,file.size);
this.reader.onload = this.onReadFile.bind(this);
this.reader.readAsDataURL(file);
return dfd.promise();
},
doFilesQueue: function (filesArray,itemExecCount) {
if (filesArray.length > 0) {
itemExecCount++;
this.doLoad(filesArray.shift()).done(this.doProcess.bind(this, filesArray, itemExecCount));
}
},
doProcess: function (filesArray, itemExecCount,imgSrc,originSize,afterZipSize) {
this.$body.trigger('item_progress', [itemExecCount, this.itemTotalCount, imgSrc,originSize,afterZipSize]);
setTimeout(this.doFilesQueue.bind(this, filesArray, itemExecCount), 100);
},
run: function () {
this.$body = $('body');
this.reader = new FileReader();
this.loadImg = new Image();
this.canvas = document.createElement('canvas');
this.context = this.canvas.getContext('2d');
this.createCss()
.createBtn()
.initEvent();
}
}).run();
})();