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demo.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>JS Seam carving</title>
<script src="seam.js" type="text/javascript" charset="utf-8"></script>
<style type="text/css" media="screen">
html, body{
background: white;
}
canvas{
border: solid 1px #515151;
margin: 20px;
display: block;
background: transparent;
}
#grayCanvas, #sobelCanvas, #energyCanvas{
display: none;
background: red;
}
input[type="range"]{
width: 300px;
margin: 20px;
display: block;
}
#container{
position:relative;
margin: 20px;
}
#container canvas{
position: absolute;
top: 0px;
left: 0px;
margin: 0;
}
#drawCanvas{
opacity:0.5;
cursor:pointer;
}
</style>
</head>
<body>
<input id="nbseams" type="range" min="-200" max="200" step="1" value="0" />
<input type="button" name="delete" value="delete selected" id="deletebtn" />
<label>Red: <input type="checkbox" name="red" value="" id="redMark"></label>
<div id="container">
<canvas id="orgCanvas" width="500" height="500"></canvas>
<canvas id="drawCanvas" width="500" height="500"></canvas>
</div>
<canvas id="grayCanvas" width="500" height="500"></canvas>
<canvas id="sobelCanvas" width="500" height="500"></canvas>
<canvas id="energyCanvas" width="500" height="500"></canvas>
<canvas id="seamCanvas" width="500" height="500"></canvas>
<script type="text/javascript" charset="utf-8">
(function(){
var USE_WORKER = true;
var worker = new Worker('worker.js');
document.addEventListener('DOMContentLoaded', function(){
var orgCtx = orgCanvas.getContext('2d');
var grayCtx = grayCanvas.getContext('2d');
var sobelCtx = sobelCanvas.getContext('2d');
var energyCtx = energyCanvas.getContext('2d');
var seamCtx = seamCanvas.getContext('2d');
var drawCtx = drawCanvas.getContext('2d');
var originalImage = new Image();
//originalImage.src = "images/fusee.gif";
//originalImage.src = "images/people.jpg";
//originalImage.src = "images/forest.jpg";
originalImage.src = "images/desert.jpg";
//originalImage.src = "images/dolphin.jpg";
//Seam carving function
originalImage.addEventListener('load', function(){
container.style.height = this.height + "px";
container.style.width = this.width + "px";
drawCanvas.height = sobelCanvas.height = grayCanvas.height = energyCanvas.height = seamCanvas.height = orgCanvas.height = this.height;
drawCanvas.width = sobelCanvas.width = grayCanvas.width = energyCanvas.width = seamCanvas.width = orgCanvas.width = this.width;
orgCtx.drawImage(this, 0,0);
seamCtx.drawImage(this, 0,0);
drawCtx.clearRect(0,0,this.width, this.height)
drawCtx.setFillColor("#00FF00")
redMark.addEventListener('change', function(){
if(this.checked)
drawCtx.setFillColor("#FF0000")
else
drawCtx.setFillColor("#00FF00")
})
// Mask markers
var onmove = function(e){
var x = e.clientX - container.offsetLeft + document.body.scrollLeft;
var y = e.clientY - container.offsetTop + document.body.scrollTop;
//console.log("x: " + x + " y: " + y);
var s = 15;
drawCtx.beginPath();
drawCtx.arc(x, y, s, 0, Math.PI * 2, true);
drawCtx.closePath();
drawCtx.fill();
}
drawCanvas.addEventListener('mousedown', function(e){ drawCanvas.addEventListener('mousemove', onmove); });
drawCanvas.addEventListener('mouseup', function(e){ drawCanvas.removeEventListener('mousemove', onmove); });
var img = this;
//resize
nbseams.addEventListener('change', function(){
var slices = this.value * 1; //workaround weird safari bug
//var slices = -1;
seamCanvas.width = img.width + slices;
var imageData = orgCtx.getImageData(0,0, img.width, img.height); //considered DOM...
var masks = drawCtx.getImageData(0,0, img.width, img.height);
var out = seamCtx.createImageData(img.width + slices, img.height);
var d = seamCtx.createImageData(img.width + (slices > 0 ? (0) : slices + 1), img.height);
if(USE_WORKER){
var start = new Date().getTime();
worker.onmessage = function(event){
var res = event.data;
for(var i = 0; i < out.data.length; i++)
out.data[i] = res.data[i];
//copy result in imageData
seamCtx.putImageData(out, 0,0);
orgCanvas.style.width = img.width + slices + "px";
drawCanvas.style.width = img.width + slices + "px";
var end = new Date().getTime();
console.log("finished: %ss", (end - start) / 1000);
}
// ImageData are considered DOM elements, we can't use them in WebWorker
// We create a ImageData like object
var coincoinIN = {'data': imageData.data, 'width': imageData.width, 'height': imageData.height};
var coincoinOUT = {'data': out.data, 'width': out.width, 'height': out.height};
var coicoinMASKS = {'data': masks.data, 'width': masks.width, 'height': masks.height};
worker.postMessage({'f': 'resize', 'imageData': coincoinIN, 'masks': coicoinMASKS, 'out':coincoinOUT});
}
else{
var start = new Date().getTime();
var s = new SeamCarving(imageData, masks, out);
s.resize();
grayCtx.putImageData(s.debug(d, 0), 0,0);
sobelCtx.putImageData(s.debug(d, 2), 0,0);
energyCtx.putImageData(s.debug(d, 1), 0,0);
seamCtx.putImageData(s.out, 0,0);
orgCanvas.style.width = img.width + slices + "px";
drawCanvas.style.width = img.width + slices + "px";
var end = new Date().getTime();
console.log("finished: %ss", (end - start) / 1000);
}
});
//delete selection
deletebtn.addEventListener('click', function(){
var out = seamCtx.createImageData(img.width, img.height);
var imageData = orgCtx.getImageData(0,0, img.width, img.height);
var masks = drawCtx.getImageData(0,0, img.width, img.height);
if(USE_WORKER){
var start = new Date().getTime();
worker.onmessage = function(event){
var res = event.data;
for(var i = 0; i < out.data.length; i++)
out.data[i] = res.data[i];
seamCtx.putImageData(out, 0,0);
var end = new Date().getTime();
console.log("finished: %ss", (end - start) / 1000);
}
var coincoinIN = {'data': imageData.data, 'width': imageData.width, 'height': imageData.height};
var coincoinOUT = {'data': out.data, 'width': out.width, 'height': out.height};
var coicoinMASKS = {'data': masks.data, 'width': masks.width, 'height': masks.height};
worker.postMessage({'f': 'erase', 'imageData': coincoinIN, 'masks': coicoinMASKS, 'out':coincoinOUT});
}
else{
var start = new Date().getTime();
var s = new SeamCarving(imageData, masks, out);
s.erase();
var d = seamCtx.createImageData(img.width, img.height);
grayCtx.putImageData(s.debug(d, 0), 0,0);
sobelCtx.putImageData(s.debug(d, 2), 0,0);
energyCtx.putImageData(s.debug(d, 1), 0,0);
seamCtx.putImageData(s.out, 0,0);
var end = new Date().getTime();
console.log("finished: %ss", (end - start) / 1000);
}
});
});
});
})()
</script>
</body>
</html>