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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Color Tool</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="style.css" rel="stylesheet">
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h1>Color Tool</h1>
<div class = "row" style="margin-bottom:50px;margin-top:50px">
<div class="col-md-6">
<canvas id="canvas"></canvas>
</div>
<div class="col-md-6">
<form style="margin-bottom:50px;">
<div class="custom-file">
<input type="file" class="custom-file-input" id="imgload" >
<label class="custom-file-label" for="customFile">Choose file</label>
</div>
</form>
<button id="grayscalebtn" type="button" class="btn btn-primary">Grayscale</button>
<button id="invertbtn" type="button" class="btn btn-primary">Invert</button>
<button id="x86btn" type="button" class="btn btn-primary">to x86</button>
<a download="img.txt" id="downloadlink" style="display: none">img.txt</a>
</div>
</div>
<div class="card">
<div class="card-body">
<div class="alert alert-warning" role="alert">
<ul>
<li>Resize the image to 255 x 200(this has 51000 bytes) or less.</li>
<li>ASM x86 has a palette of 16 colors.</li>
</ul>
</div>
<samp>
<p>width, height,</p>
<p>pixel(0, 0), [...], pixel(width, 0),</p>
<p>[...],</p>
<p>pixel(0, h), [...], pixel(width, height)</p>
<a href="bootimg.zip">bootimg.zip</a>
</samp>
</div>
</div>
<div style="margin-top:50px;">
<h2>Links</h2>
<p><a href = "https://en.wikipedia.org/wiki/Color_difference">https://en.wikipedia.org/wiki/Color_difference</a></p>
<p><a href = "https://en.wikipedia.org/wiki/BIOS_color_attributes">https://en.wikipedia.org/wiki/BIOS_color_attributes</a></p>
</div>
</div>
<style>
canvas {
image-rendering: -moz-crisp-edges;
image-rendering: -webkit-crisp-edges;
image-rendering: pixelated;
image-rendering: crisp-edges;
}
</style>
<script type="text/javascript">
var arrHEX = [
"#000000", "#0000AA", "#00AA00", "#00AAAA",
"#AA0000", "#AA00AA", "#AA5500", "#AAAAAA",
"#555555", "#5555FF", "#55FF55", "#55FFFF",
"#FF5555", "#FF55FF", "#FFFF55", "#FFFFFF"
];
var arrRGB = [
[0,0,0], [0,0,170], [0,170,0], [0,170,170],
[170,0,0], [170,0,170], [170,85,0], [170,170,170],
[85,85,85], [85,85,255], [85,255,85], [85,255,255],
[255,85,85], [255,85,255], [255,255,85], [255,255,255]
];
document.getElementById('imgload').onchange = function (evt) {
var img = new Image();
img.src = URL.createObjectURL(evt.target.files[0]);
img.onload = function() {
draw(this);
}
}
var textFile = null, makeTextFile = function (text) {
var data = new Blob([text], {type: 'text/plain'});
if (textFile !== null) {
window.URL.revokeObjectURL(textFile);
}
textFile = window.URL.createObjectURL(data);
return textFile;
};
function draw(img) {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
console.log(img);
canvas.height = img.height;
canvas.width = img.width;
ctx.drawImage(img, 0, 0);
img.style.display = 'none';
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var data = imageData.data;
var link = document.getElementById('downloadlink');
var invert = function() {
link.style.display = 'none';
for (var i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i]; // red
data[i + 1] = 255 - data[i + 1]; // green
data[i + 2] = 255 - data[i + 2]; // blue
}
ctx.putImageData(imageData, 0, 0);
};
var x86 = function() {
var ans = [];
ans.push(imageData.width);
ans.push(imageData.height);
for (var i = 0; i < data.length; i += 4) {
var best;
var dist = 3*256*256;
for(var j = 0; j < 16; j++){
var dr = arrRGB[j][0] - data[i];
var dg = arrRGB[j][1] - data[i + 1];
var db = arrRGB[j][2] - data[i + 2];
var currdist = 2*dr*dr + 4*dg*dg + 3*db*db;
if(currdist < dist){
best = j;
dist = currdist;
}
}
data[i] = arrRGB[best][0];
data[i + 1] = arrRGB[best][1];
data[i + 2] = arrRGB[best][2];
ans.push(best);
}
ctx.putImageData(imageData, 0, 0);
var str = "";
for(var i = 0; i < ans.length; i++){
if(i) str += ", ";
str += ans[i];
}
link.href = makeTextFile(str);
link.style.display = 'block';
};
var grayscale = function() {
link.style.display = 'none';
for (var i = 0; i < data.length; i += 4) {
var avg = (data[i] + data[i + 1] + data[i + 2]) / 3;
data[i] = avg; // red
data[i + 1] = avg; // green
data[i + 2] = avg; // blue
}
ctx.putImageData(imageData, 0, 0);
};
var invertbtn = document.getElementById('invertbtn');
invertbtn.addEventListener('click', invert);
var grayscalebtn = document.getElementById('grayscalebtn');
grayscalebtn.addEventListener('click', grayscale);
var x86btn = document.getElementById('x86btn');
x86btn.addEventListener('click', x86);
}
</script>
</body>
</html>