Created
September 10, 2020 03:36
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Image deduplicator
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(function (blockSelector, itemSelector) { | |
let list = document.querySelector(blockSelector); | |
let observer = () => list.querySelectorAll(itemSelector +":not(.imd-hash)") | |
.forEach(el => { | |
el.classList.add('imd-hash'); | |
let width = 32; | |
let height = 32; | |
let img = new Image(); | |
img.onload = function() { | |
let canvas = document.createElement("canvas"); | |
canvas.width = width; canvas.height = height; | |
let context = canvas.getContext('2d'); | |
context.drawImage(img, 0, 0, width, height); | |
let data = context.getImageData(0, 0, width, height).data; | |
let bytesMap = new Array(data.length / 4); | |
for(let i = 0; i < bytesMap.length; i++){ | |
let j = i * 4; | |
bytesMap[i] = Math.round((data[j] + data[j+1] + data[j+2]) / 3); | |
} | |
let average = bytesMap.reduce((i, p) => p + i) / bytesMap.length; | |
let bit = 0n; | |
let hash = 0n; | |
bytesMap.forEach((i) => hash |= (i >= average ? 1n : 0n) << bit ++); | |
let lhash = 'img-hash-' + hash.toString(32); | |
const hv = localStorage.getItem(lhash); | |
console.log(lhash, hv); | |
if (!hv) { | |
localStorage.setItem(lhash, 1); | |
} else { | |
el.style.filter = "blur(2px) grayscale(50%)"; | |
} | |
} | |
img.crossOrigin = "Anonymous"; | |
img.src = el.dataset.thumb | |
}); | |
let mo = new MutationObserver(observer); | |
mo.observe(list, { | |
childList: true, | |
subtree: true | |
}); | |
observer(); | |
})("#video_layout_search", ".video_item") | |
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