PxDiffFrameAnimation/tool.html at master · newbieYoung/PxDiffFrameAnimation · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>像素差逐帧动画工具</title>
	<script type="text/javascript" src="./node_modules/doublylinkedlist/index.js"></script>
	<style type="text/css">
		body{
			margin:0;
			padding: 0;
			background-color:rgb(222,222,222);
        }
        #next,#reset,#reset-check{
        	display:inline-block;
        	width:30%;
        }
        textarea,input[readonly]{
        	background-color:gray;
        	border:0;
        }
        input[type=button]{
        	margin:10px;
        }
    </style>
</head>
<body>
	<div id="params">
		颜色误差值:<input type="text" name="pxDiff" value="10"><br/>
		截取最小长度:<input type="text" name="minLen" value="720"><br/>
		此次计算的无损还原图填充255后的长度:<input type="text" name="resetDataLength"><br/>
		位置信息:<textarea name="position" readonly="true"></textarea><br/>
		位置信息数组长度:<input type="text" name="positionLen" readonly="true"><br/>
		像素差图片高度:<input type="text" name="height" readonly="true"><br/>
		前后帧相同颜色值数量:<input type="text" name="sameNum" readonly="true"><br/>
		存在数据丢失颜色值数量:<input type="text" name="diffNum" readonly="true">(使用putImageData显示像素数据然后再使用getImageData获取像素数据会发现前后像素数据有丢失)<br/>
		填充255alpha值后的像素差数据长度:<input type="text" name="fillLength" readonly="true"><br/>
		无损还原图数据丢失位数:<input type="text" name="errorNum" readonly="true"><br/>
		<input type="button" name="compute" value="计算像素差并查看还原效果">
	</div>
	<div id="last"></div>
	<div>
		<div id="next"></div>
		<div id="reset"></div>
		<div id="reset-check"></div>
	</div>
	<div id="diff"></div>
	<div id="resetData"></div>
	<script type="text/javascript">
		'use strict';
		//请输入逐帧动画中图片的宽度和高度（约定逐帧动画中每一帧图片的宽度和高度一样）
		let width = 895;
		let height = 564;
		//请输入上一帧的相关信息
		let last = {
			src:'./images/macscreen/0.png',
			isReset:false,//是否使用上次计算的无损还原图
			width:752,
			height:895,
			lastResetDataLength:2692160//width*height*4
		};
		//请输入下一帧的相关信息
		let next = {
			src:'./images/macscreen/1.png',
		};
		//加载图片
		let lastImg = new Image();
		lastImg.src = last.src;
		lastImg.onload = function(){
			last.img = this;
		};
		lastImg.onerror = function(){
			console.log('前一帧图片路径为:('+last.src+')加载失败！');
		};
		let nextImg = new Image();
		nextImg.src = next.src;
		nextImg.onload = function(){
			next.img = this;
		};
		nextImg.onerror = function(){
			console.log('后一帧图片路径为:('+next.src+')加载失败！');
		}
		//页面元素
		let paramsDiv = document.querySelector('#params');
		let pxDiffInput = document.querySelector('#params input[name=pxDiff]');
		let minLenInput = document.querySelector('#params input[name=minLen]');
		let computeButton = document.querySelector('#params input[name=compute]');
		let positionTextArea = document.querySelector('#params textarea[name=position]');
		let positionLenInput = document.querySelector('#params input[name=positionLen]');
		let heightInput = document.querySelector('#params input[name=height]');
		let sameNumInput = document.querySelector('#params input[name=sameNum]');
		let diffNumInput = document.querySelector('#params input[name=diffNum]');
		let fillLengthInput = document.querySelector('#params input[name=fillLength]');
		let lastDiv = document.querySelector('#last');
		let nextDiv = document.querySelector('#next');
		let resetCheckDiv = document.querySelector('#reset-check');
		let diffDiv = document.querySelector('#diff');
		let resetDiv = document.querySelector('#reset');
		let resetDataDiv = document.querySelector('#resetData');
		let resetDataLengthInput = document.querySelector('#params input[name=resetDataLength]');
		let errorNumInput = document.querySelector('#params input[name=errorNum]');
		//不断轮询前后帧图片是否加载完毕
		let num = 0;
		let interval = setInterval(function(){
			if((last.img&&next.img)||num>=5){
				if(interval){
					clearInterval(interval);
				}
				if(num>=5&&(!last.img||!next.img)){
					console.log('达到轮询最大次数但是图片依然没有完全加载完成！');
				}else{
					if(!last.isReset){
						last.canvas = document.createElement('canvas');
						last.canvas.width = width;
						last.canvas.height = height;
						last.context = last.canvas.getContext('2d');
						last.context.drawImage(last.img, 0, 0, width, height);
						last.imageData = last.context.getImageData(0, 0, width, height);
					}else{
						last.tempCanvas = document.createElement('canvas');
						last.tempCanvas.width = last.width;
						last.tempCanvas.height = last.height;
						last.tempContext = last.tempCanvas.getContext('2d');
						last.tempContext.drawImage(last.img, 0, 0, last.width, last.height);
						last.tempImageData = last.tempContext.getImageData(0, 0, last.width,last.height);
						last.tempList = new DoublyLinkedList();
						for(let i=0;i<last.tempImageData.data.length;i++){
							last.tempList.push(last.tempImageData.data[i]);
						}
						last.no = 0;
						last.index = 0;
						last.node = last.tempList.getHead();
						while(last.index<last.lastResetDataLength-1){
							last.no++;
							last.index++;
							last.node = last.node.next;
							if(last.no%3===0){
								let next = last.node.next;
								last.node.previous.next = last.node.next;
								if(next){
									last.node.next.previous = last.node.previous;
								}
								last.node.previous = null;
								last.node.next = null;
								last.index++;
								last.tempList.length--;
								last.node = next;
							}
						}
						last.canvas = document.createElement('canvas');
						last.canvas.width = width;
						last.canvas.height = height;
						last.context = last.canvas.getContext('2d');
						last.context.drawImage(last.img, 0, 0, width, height);
						last.imageData = last.context.getImageData(0, 0, width, height);
						last.no = 0;
						last.node = last.tempList.getHead();
						while(last.no<last.imageData.data.length){
							last.imageData.data[last.no] = last.node.value;
							last.no++;
							last.node = last.node.next;
						}
						last.context.putImageData(last.imageData, 0, 0, 0, 0, width, height);
					}
					lastDiv.appendChild(last.canvas);
					next.canvas = document.createElement('canvas');
					next.canvas.width = width;
					next.canvas.height = height;
					next.context = next.canvas.getContext('2d');
					next.context.drawImage(next.img,0,0,width,height);
					next.imageData = next.context.getImageData(0,0,width,height);
					nextDiv.appendChild(next.canvas);
					getDiffAndReset();
					computeButton.addEventListener('click',function(){
						getDiffAndReset();
					});
				}
			}
			num++;
		},1000);
		//计算像素差并查看还原效果
		function getDiffAndReset(){
			let pxDiff = parseFloat(pxDiffInput.value);
			let minLen = parseFloat(minLenInput.value);
			let sameNum = 0;
			if(pxDiff>=0&&minLen){
				//计算像素差
				let pxArray = new Array(last.imageData.data.length);
				let lastData = last.imageData.data;
				let nextData = next.imageData.data;
				for(let i=0;i<pxArray.length;i++){
					/**
					 * 前一帧有值但是后一帧变为0，如果还是记录后一帧的0，由于存在未剔除的无效
					 * 位，Canvas会默认赋值为0，那么有效位的0就会和无效位的0混淆，导致还原时
					 * 无法区分，发生还原异常的情况；为了解决这个问题，这里记录前一帧的值，后
					 * 边还原时只要遇到像素差数组中的值和前一帧的值相等，那么就说明这里应该是
					 * 0
					 * 另外之所以后一帧为0时忽略颜色值误差是因为颜色变浅肉眼很难看出来，但是颜色消失相对容易用肉眼看出来
					 */
					if(nextData[i]===0&&lastData[i]!==nextData[i]){
						pxArray[i] = lastData[i];
					}else if(Math.abs(lastData[i] - nextData[i])>pxDiff){
						pxArray[i] = nextData[i];
					}
					if(Math.abs(lastData[i] - nextData[i])<=pxDiff&&nextData[i]!==0){
						sameNum++;
					}
				}
				sameNumInput.value = sameNum;
				//计算位置信息
				let final = new DoublyLinkedList();
	            for (let i = 0; i < pxArray.length; i++) {
	                final.push(pxArray[i]);
	            }
	            let initLength = final.size();
	            let index = 0;
	            let no = 0;
	            let start = 0;
	            let space = 0;
	            let diff = [];
	            while (index < initLength) {
	                if (final.get(no,true).value == null) {
	                    if (space === 0) {
	                        start = no;
	                    }
	                    space++;
	                    no++;
	                } else {
	                    if (space >= minLen) {
	                        diff.push([start, space]);
	                    	for(let i=0;i<space;i++){
	                        	final.del(start,true);
	                        }
	                        space = 0;
	                        no = start + 1; //截取后当前移动到start位，但是由于当前已经判断过了，所以从下一位开始
	                    } else {
	                        space = 0;
	                        no++;
	                    }
	                }
	                index++;
	                if (index === initLength) {
	                    diff.push([start, space]);
	                    for(let i=0;i<space;i++){
	                    	final.del(start,true);
	                    }
	                    space = 0;
	                    no = start;
	                }
	            }
	            //由于浏览器的canvas实现存在数据丢失的问题，所以这里需要重新插入alpha值让其等于255
	            no = 0;
	           	let node = final.getHead();
	           	while(node){
	           		node = node.next;
	           		no++;
	           		if(no%3===0&&node){
	           			let temp = {
					        value: 255,
					        previous: null,
					        next: null
					    };
					    temp.previous = node.previous;
					    node.previous.next = temp;
					    temp.next = node;
					    node.previous = temp;
					    final.length++;
	           		}
	           	}
	           	if(final.size()%4!==0){
	           		let overNum = 4-final.size()%4;
	           		for(let i=0;i<overNum-1;i++){
	           			final.push(null);
	           		}
	           		final.push(255);
	           	}
	           	let fillLength = final.size();
	           	fillLengthInput.value = fillLength;
	           	//输出数据
	            let num3 = final.size();
	            if (num3 / 4 !== Math.floor(num3 / 4)) {
	                num3 = (Math.floor(num3 / 4) + 1) * 4;
	            }
	            let num1 = width;//像素差png宽度为原图宽度
	            let num2 = Math.floor(num3 / 4 / num1) + 1;
	            diff.push([final.size(), num1 * num2 * 4 - final.size()]);
	            for(let i=final.size();i<num1*num2*4;i++){
	                final.push(null);
	            }
	            positionTextArea.innerHTML = diff;
	            positionLenInput.value = diff.length;
	            let diffCanvas = document.querySelector('#diff canvas');
	            if(!diffCanvas){
	            	diffCanvas = document.createElement('canvas');
	            }
	            diffCanvas.width = num1;
	            diffCanvas.height = num2;
	            heightInput.value = num2;
	            diffDiv.appendChild(diffCanvas);
	            let diffContext = diffCanvas.getContext('2d');
	            let diffImageData = diffContext.getImageData(0, 0, num1, num2);
	            for (let i = 0; i < num3; i++) { //忽略补位数据
	                diffImageData.data[i] = final.get(i,true).value;
	            }
	            diffContext.putImageData(diffImageData, 0, 0, 0, 0, num1, num2);
	            //检查canvas是否有数据丢失
	            let diffNum = 0;
	            let diffImageDataNext = diffContext.getImageData(0, 0, num1, num2);
	            for(let i=0;i<diffImageDataNext.data.length;i++){
	            	if(diffImageData.data[i]!==diffImageDataNext.data[i]){
	            		diffNum++;
	            	}
	            }
	            diffNumInput.value = diffNum;
	            //还原
	           	let dataList = new DoublyLinkedList();
				for(let i=0;i<diffImageData.data.length;i++){
					dataList.push(diffImageData.data[i]);
				}
				//去除掉新增的所有255alpha值
				no = 0;
				index = 0;
				node = dataList.getHead();
				while(index<fillLength-1){
					no++;
					index++;
					node = node.next;
					if(no%3===0){
						let next = node.next;
						node.previous.next = node.next;
						node.next.previous = node.previous;
						node.previous = null;
						node.next = null;
						index++;
						dataList.length--;
						node = next;
					}
				}
				//填补去掉的空白
				for(let i=diff.length-2;i>=0;i--){
					let start = diff[i][0];
					let space = diff[i][1];
					dataList.insert(start,new Array(space),true);
				}
				let tempCanvas = document.createElement('canvas');//复制前一帧像素数据
				tempCanvas.width = width;
				tempCanvas.height = height;
				let tempContext = tempCanvas.getContext('2d');
				let tempImageData = tempContext.getImageData(0,0,width,height);
				for(let i=0;i<lastData.length;i++){
					tempImageData.data[i] = lastData[i];
				}
				node = dataList.getHead();
				no = 0;
				while(node.next){
					if(node.value&&!(node.value instanceof Array)){
						if(tempImageData.data[no]===node.value){
							tempImageData.data[no] = 0;
						}else{
							tempImageData.data[no] = node.value;
						}
					}
					if(node.value instanceof Array){
						no+= node.value.length;
					}else{
						no++;
					}
					node = node.next;
				}
				let resetCanvas = document.querySelector('#reset canvas');
				if(!resetCanvas){
					resetCanvas = document.createElement('canvas');
					resetCanvas.width = width;
					resetCanvas.height = height;
				}
				let resetContext = resetCanvas.getContext('2d');
				resetContext.clearRect(0, 0, width, height);
				resetContext.putImageData(tempImageData, 0, 0, 0, 0, width, height);
				resetDiv.appendChild(resetCanvas);
				//无损保存此次还原图，以便充当一下计算的前帧
				let resetData = new DoublyLinkedList();
				for(let i=0;i<tempImageData.data.length;i++){
					resetData.push(tempImageData.data[i]);
				}
				let resetDataNo = 0;
	           	let resetDataNode = resetData.getHead();
	           	while(resetDataNode.next){
	           		resetDataNode = resetDataNode.next;
	           		resetDataNo++;
	           		if(resetDataNo%3===0){
	           			let temp = {
					        value: 255,
					        previous: null,
					        next: null
					    };
					    temp.previous = resetDataNode.previous;
					    resetDataNode.previous.next = temp;
					    temp.next = resetDataNode;
					    resetDataNode.previous = temp;
					    resetData.length++;
	           		}
	           	}
	           	if(resetData.size()%4!==0){
	           		let overNum = 4-resetData.size()%4;
	           		for(let i=0;i<overNum-1;i++){
	           			resetData.push(null);
	           		}
	           		resetData.push(255);
	           	}
	           	resetDataLengthInput.value = resetData.length;
				let resetDataWidth = Math.floor(Math.sqrt(resetData.length/4));
				let resetDataHeight;
				for(let i=resetDataWidth;i>=1;i--){
					resetDataHeight = resetData.length/4.0/i;
					if(resetDataHeight===Math.floor(resetDataHeight)){
						resetDataWidth = i;
						break;
					}
				}
				let tempResetDataCanvas = document.createElement('canvas');
				tempResetDataCanvas.width = resetDataWidth;
				tempResetDataCanvas.height = resetDataHeight;
				let tempResetDataContext = tempResetDataCanvas.getContext('2d');
				let tempResetDataImageData = tempResetDataContext.getImageData(0,0,resetDataWidth,resetDataHeight);
				node = resetData.getHead();
				no = 0;
				tempResetDataImageData.data[0] = node.value;
				while(node.next){
					no++;
					node = node.next;
					tempResetDataImageData.data[no] = node.value;
				}
				let resetDataCanvas = document.querySelector('#resetData canvas');
				if(!resetDataCanvas){
					resetDataCanvas = document.createElement('canvas');
					resetDataCanvas.width = resetDataWidth;
					resetDataCanvas.height = resetDataHeight;
				}
				let resetDataContext = resetDataCanvas.getContext('2d');
				resetDataContext.clearRect(0, 0, resetDataWidth, resetDataHeight);
				resetDataContext.putImageData(tempResetDataImageData, 0, 0, 0, 0, resetDataWidth, resetDataHeight);
				resetDataDiv.appendChild(resetDataCanvas);
				//测试无损还原图是否存在数据丢失
				let resetTest = new DoublyLinkedList();
				for(let i=0;i<tempResetDataImageData.data.length;i++){
					resetTest.push(tempResetDataImageData.data[i]);
				}
				no = 0;
				index = 0;
				node = resetTest.getHead();
				while(index<resetDataLengthInput.value-1){
					no++;
					index++;
					node = node.next;
					if(no%3===0){
						let next = node.next;
						node.previous.next = node.next;
						if(next){
							node.next.previous = node.previous;
						}
						node.previous = null;
						node.next = null;
						index++;
						resetTest.length--;
						node = next;
					}
				}
				let resetCheckCanvas = document.querySelector('#reset-check canvas');
				if(!resetCheckCanvas){
					resetCheckCanvas = document.createElement('canvas');
					resetCheckCanvas.width = width;
					resetCheckCanvas.height = height;
				}
				let resetCheckContext = resetCheckCanvas.getContext('2d');
				let resetCheckImage = resetCheckContext.getImageData(0,0,width,height);
				node = resetTest.getHead();
				no = 0;
				let resetErrorNum = 0;
				while(node.next){
					if(tempImageData.data[no]!==node.value){
						resetErrorNum++;
					}
					resetCheckImage.data[no] = node.value;
					no++;
					node = node.next;
				}
				resetCheckContext.clearRect(0,0,width,height);
				resetCheckContext.putImageData(resetCheckImage, 0, 0, 0, 0, width, height)
				resetCheckDiv.appendChild(resetCheckCanvas);//从显示结果判断
				errorNumInput.value = resetErrorNum;//从计算结果判断
			}else{
				console.log('请输入误差值以及最小取值长度');
			}
		}
	</script>
</body>
</html>