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svg-filters.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Blur Up Thumbs</title>
<style>
body {
font-family: sans-serif;
margin: 2rem;
}
.row {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
gap: 2rem;
margin-bottom: 2rem;
}
img {
width: 100%;
}
code {
display: block;
font-size: 0.8em;
margin-top: 1em;
word-break: break-all;
}
small {
color: firebrick;
font-size: 0.8em;
}
</style>
</head>
<body>
<h1>Compare Blur Up Thumbs</h1>
<div class="table">
<div class="row">
<div>
<h3>Original</h3>
<img data-src="https://www.mux.com/images/mux-logo.png" data-max-size="320">
</div>
<div>
<h3>WebP 16px + Gaussian blur</h3>
<img data-src="https://www.mux.com/images/mux-logo.png" data-max-size="16" data-blur="svg">
</div>
<div>
<h3>WebP 16px + Gaussian blur + transparency</h3>
<img data-src="https://www.mux.com/images/mux-logo.png" data-max-size="16" data-blur="svg-complex">
</div>
</div>
</div>
<script type="module">
import resize from 'https://cdn.jsdelivr.net/npm/@jsquash/[email protected]/index.js';
import { decode } from './utils/png.js';
import { encode } from './utils/webp.js';
for (const row of document.querySelectorAll('.row')) {
for (const div of row.children) {
const title = div.querySelector('h3');
const blurImg = div.querySelector('img');
let maxSize = Number(blurImg.dataset.maxSize);
let src = `${blurImg.dataset.src}?width=${maxSize}`;
let accept = blurImg.dataset.accept;
if (blurImg.dataset.blur?.startsWith('svg')) {
const response = await fetch(src, { headers: { 'Accept': accept ?? 'image/png' } });
const arrayBuffer = await response.arrayBuffer();
const originalImageData = await decode(arrayBuffer);
const ratio = originalImageData.width / originalImageData.height;
const resizedImageData = await resize(originalImageData, { width: 16, height: 16 / ratio });
const webpBuffer = await encode(resizedImageData, { quality: 70 });
const base64String = btoa(String.fromCharCode(...new Uint8Array(webpBuffer)));
const blurDataURL = `data:${response.headers.get('content-type')};base64,${base64String}`;
const image = await loadImage(src);
const aspectRatio = image.width / image.height;
const svgBlurFilter = blurImg.dataset.blur === 'svg' ? svgBlurImage : svgBlurImageComplex;
src = `data:image/svg+xml;charset=utf-8,${svgBlurFilter(blurDataURL, 320, 320 / aspectRatio)}`;
const blurCode = document.createElement('code');
blurCode.textContent = `${base64String}`;
blurImg.after(blurCode);
const size = document.createElement('div');
size.innerHTML = `<small>Size: ${byteSize(base64String)}B</small>`;
const filterToggle = document.createElement('div');
filterToggle.innerHTML = `<hr>
<label>
<input type="checkbox" checked>
Blur filter on/off
</label>
`;
filterToggle.querySelector('input').addEventListener('change', (e) => {
if (e.target.checked) {
blurImg.src = src;
} else {
blurImg.src = blurDataURL
}
});
blurCode.after(size, filterToggle);
}
div.querySelector('img').src = src;
}
}
function svgBlurImage(blurDataURL, width, height, std = 20) {
const svg = /*html*/`<svg xmlns="http://www.w3.org/2000/svg" ${width ? `width="${width}"` : ''} ${height ? `height="${height}"` : ''}><filter id="b" color-interpolation-filters="sRGB"><feGaussianBlur stdDeviation="${std}"/><feComponentTransfer><feFuncA type="discrete" tableValues="1 1"/></feComponentTransfer></filter><g filter="url(#b)"><image width="100%" height="100%" href="${blurDataURL}"/></g></svg>`;
return svg.replace(/#/g, '%23');
}
function svgBlurImageComplex(blurDataURL, width, height, std = 20) {
const svg = /*html*/`<svg xmlns="http://www.w3.org/2000/svg" ${width ? `width="${width}"` : ''} ${height ? `height="${height}"` : ''}><filter id="b" color-interpolation-filters="sRGB"><feGaussianBlur stdDeviation="${std}"/><feColorMatrix values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 100 -1" result="s"/><feFlood x="0" y="0" width="100%" height="100%"/><feComposite operator="out" in="s"/><feComposite in2="SourceGraphic"/><feGaussianBlur stdDeviation="${std}"/></filter><g filter="url(#b)"><image width="100%" height="100%" href="${blurDataURL}"/></g></svg>`;
return svg.replace(/#/g, '%23');
}
async function loadImage(src) {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => resolve(img);
img.onerror = (...args) => reject(args);
img.crossOrigin = 'anonymous';
img.src = src;
});
}
function getImageData(image) {
const canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
const context = canvas.getContext('2d');
context.drawImage(image, 0, 0);
return context.getImageData(0, 0, image.width, image.height);
}
function binaryToBase64(binary) {
return btoa(String.fromCharCode(...binary));
}
async function resizeImage(image, width) {
if (image.width <= width) return image;
const scale = width / Math.max(image.width, image.height)
return await createImageBitmap(image, {
resizeWidth: Math.round(image.width * scale),
resizeHeight: Math.round(image.height * scale),
});
}
function toWebpDataURL(imageData) {
const canvas = document.createElement('canvas');
canvas.width = imageData.width;
canvas.height = imageData.height;
const context = canvas.getContext('2d');
context.putImageData(imageData, 0, 0);
return canvas.toDataURL('image/webp');
}
function byteSize(str) {
return new Blob([str]).size;
}
</script>
</body>
</html>