JSFiddle - React, Tailwind, and code Playground

by codingdude

HTML

<canvas id="canvas"></canvas>

CSS

canvas {
    float:left
}

JavaScript

var canvas = document.getElementById("canvas"),
    ctx = canvas.getContext("2d"),
    img = new Image();

img.addEventListener('load', function () {
    canvas.width = this.width;
    canvas.height = this.height;
    ctx.drawImage(this, 0, 0, canvas.width, canvas.height);
    oilPaintEffect(canvas, 14, 155);
});

img.crossOrigin = "Anonymous";
img.src = "https://i.imgur.com/U0wgzIT.jpg";

function oilPaintEffect(canvas, radius, intensity) {
    var width = canvas.width,
        height = canvas.height,
        imgData = ctx.getImageData(0, 0, width, height),
        pixData = imgData.data,
        destCanvas = document.createElement("canvas"),
        dCtx = destCanvas.getContext("2d"),
        pixelIntensityCount = [];

    destCanvas.width = width;
    destCanvas.height = height;

    // for demo purposes, remove this to modify the original canvas
    document.body.appendChild(destCanvas);

    var destImageData = dCtx.createImageData(width, height),
        destPixData = destImageData.data,
        intensityLUT = [],
        rgbLUT = [];

    for (var y = 0; y < height; y++) {
        intensityLUT[y] = [];
        rgbLUT[y] = [];
        for (var x = 0; x < width; x++) {
            var idx = (y * width + x) * 4,
                r = pixData[idx],
                g = pixData[idx + 1],
                b = pixData[idx + 2],
                avg = (r + g + b) / 3;

            intensityLUT[y][x] = Math.round((avg * intensity) / 255);
            rgbLUT[y][x] = {
                r: r,
                g: g,
                b: b
            };
        }
    }


    for (y = 0; y < height; y++) {
        for (x = 0; x < width; x++) {

            pixelIntensityCount = [];

            // Find intensities of nearest pixels within radius.
            for (var yy = -radius; yy <= radius; yy++) {
                for (var xx = -radius; xx <= radius; xx++) {
                    if (y + yy > 0 && y + yy < height && x + xx > 0 && x + xx < width) {
                        var...