Functional app
This commit is contained in:
CrispyBaguette
parent
83b44f5fd3
commit
b32887cd3c
15
client/.vscode/launch.json
vendored
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15
client/.vscode/launch.json
vendored
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{
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// Use IntelliSense to learn about possible attributes.
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// Hover to view descriptions of existing attributes.
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// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
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"version": "0.2.0",
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"configurations": [
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{
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"type": "pwa-chrome",
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"request": "launch",
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"name": "Launch Chrome against localhost",
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"url": "http://localhost:3000",
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"webRoot": "${workspaceFolder}"
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}
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]
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}
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28504
client/package-lock.json
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28504
client/package-lock.json
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@ -3,6 +3,10 @@
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"@fortawesome/fontawesome-svg-core": "^1.2.36",
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"@fortawesome/free-brands-svg-icons": "^5.15.4",
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"@fortawesome/free-solid-svg-icons": "^5.15.4",
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"@fortawesome/react-fontawesome": "^0.1.16",
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"@testing-library/jest-dom": "^5.16.1",
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"@testing-library/react": "^11.2.7",
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"@testing-library/user-event": "^12.8.3",
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@ -10,9 +14,11 @@
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"@types/node": "^12.20.37",
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"@types/react": "^17.0.37",
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"@types/react-dom": "^17.0.11",
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"classnames": "^2.3.1",
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"file-saver": "^2.0.5",
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"react": "^17.0.2",
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"react-dom": "^17.0.2",
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"react-scripts": "4.0.3",
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"react-scripts": "next",
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"typescript": "^4.5.3",
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"web-vitals": "^1.1.2"
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},
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@ -39,5 +45,12 @@
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"last 1 firefox version",
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"last 1 safari version"
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]
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},
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"devDependencies": {
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"@tailwindcss/forms": "^0.4.0",
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"@types/file-saver": "^2.0.4",
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"autoprefixer": "^10.4.0",
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"postcss": "^8.4.4",
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"tailwindcss": "^3.0.1"
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}
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}
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6
client/postcss.config.js
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6
client/postcss.config.js
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module.exports = {
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plugins: {
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tailwindcss: {},
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autoprefixer: {},
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},
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}
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@ -15,38 +15,6 @@
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<article>
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<h1>Go+Wasm image dithering tool</h1>
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<aside>Featuring the Nord Color Palette</aside>
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<p>
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Load an image, click Go and wait (potentially for a while) for the image
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to be dithered using the Nord color palette and the Floyd-Steinberg
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algorithm.
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</p>
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<p>
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Running in the browser with Wasm causes a bit of a performance penalty.
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Multithreading is not available (not that it matters much since
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Floyd-Steinberg is single-threaded), and sending data back and forth
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between JS and Wasm can take a little while.
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</p>
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<p>
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I've re-used code from
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<a
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href="https://www.sitepen.com/blog/using-webassembly-with-web-workers"
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>
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this article
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</a>
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to make the Wasm code run in a web worker, with some adaptations for Go
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oddities.
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</p>
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<p>
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If you're into that sort of thing, source code is available on
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<a href="https://github.com/CrispyBaguette/wasm-palette-converter">
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GitHub
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</a>
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.
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</p>
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</article>
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<div id="root"></div>
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</body>
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</html>
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@ -29,7 +29,7 @@ addEventListener(
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go.run(instantiatedSource.instance);
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// Go does nor exposes the exports in the instantiated module :(((
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const methods = ["DitherNord"];
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const methods = ["dither"];
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wasmResolve(methods);
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postMessage({
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eventType: "INITIALISED",
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@ -1,10 +0,0 @@
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#output {
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image-rendering: optimizeSpeed; /* Legal fallback */
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image-rendering: -moz-crisp-edges; /* Firefox */
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image-rendering: -o-crisp-edges; /* Opera */
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image-rendering: -webkit-optimize-contrast; /* Safari */
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image-rendering: optimize-contrast; /* CSS3 Proposed */
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image-rendering: crisp-edges; /* CSS4 Proposed */
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image-rendering: pixelated; /* CSS4 Proposed */
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-ms-interpolation-mode: nearest-neighbor; /* IE8+ */
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}
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@ -1,9 +0,0 @@
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import React from 'react';
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import { render, screen } from '@testing-library/react';
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import App from './App';
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test('renders learn react link', () => {
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render(<App />);
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const linkElement = screen.getByText(/learn react/i);
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expect(linkElement).toBeInTheDocument();
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});
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@ -1,116 +1,58 @@
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import React from "react";
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import "./App.css";
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import ImageInput from "./ImageInput";
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import ImageOutput from "./ImageOutput";
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import Ditherer from "./Ditherer";
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import ImagePreview from "./ImagePreview";
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import Header from "./Header";
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enum AppState {
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NO_IMAGE,
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IMAGE_LOADED,
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IMAGE_PROCESSED,
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}
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function App() {
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const [imageSrc, setImageSrc] = React.useState("");
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const fileInput = React.useRef<HTMLInputElement>(null);
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const [baseImage, setBaseImage] = React.useState<Uint8ClampedArray>();
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const [ditheredImage, setDitheredImage] = React.useState<Uint8ClampedArray>();
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const [appState, setAppState] = React.useState<AppState>(AppState.NO_IMAGE);
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const handleClick = async () => {
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if (!fileInput.current) {
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return;
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}
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const workerProxy: any = await wasmWorker("main.wasm");
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setImageSrc("");
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// Check if a file was selected
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if (fileInput.current.files!.length === 0) {
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alert("No file selected");
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return;
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}
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const reader = new FileReader();
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reader.readAsArrayBuffer(fileInput.current.files![0]);
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reader.onloadend = async (evt) => {
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if (evt.target!.readyState === FileReader.DONE) {
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const imageData = new Uint8Array(evt.target!.result as ArrayBuffer);
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const ditheredImageArray = await workerProxy.DitherNord(imageData);
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const imageBlob = new Blob([ditheredImageArray.buffer], {
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type: "image/png",
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});
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const url = URL.createObjectURL(imageBlob);
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setImageSrc(url);
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}
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};
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const handleImageSubmit = async (data: Uint8ClampedArray) => {
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setBaseImage(data);
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setAppState(AppState.IMAGE_LOADED);
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const ditheredImage = await new Ditherer().dither(data);
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setDitheredImage(ditheredImage);
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setAppState(AppState.IMAGE_PROCESSED);
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};
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return (
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<div className="App">
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<input
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type="file"
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id="source-image"
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ref={fileInput}
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accept="image/png, image/jpeg"
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/>
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<button id="go-btn" type="button" onClick={handleClick}>
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Go
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</button>
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<a id="output-wrapper" download="output.png" href={imageSrc}>
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<div className="container">
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<img
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id="output"
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alt="dithering output"
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src={imageSrc}
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style={{ display: imageSrc !== "" ? "block" : "none" }}
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/>
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</div>
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</a>
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<div className="bg-nord-6 text-nord-0 min-h-screen">
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<Header />
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<main className="container mx-auto">
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<article className="max-w-prose mx-auto pb-5 px-2">
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<h1 className="text-3xl text-center pb-3">
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Go+Wasm image dithering tool
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</h1>
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<aside className="text-xl text-center pb-3">
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Featuring the Nord Color Palette
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</aside>
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<p>
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Load an image, click Go and wait (potentially for a while) for the
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image to be processed using the Floyd-Steinberg algorithm.
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</p>
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<p>
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WebAssembly might run out of memory when processing larger images.
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</p>
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</article>
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<ImageInput onImageSubmit={handleImageSubmit}></ImageInput>
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{appState === AppState.IMAGE_LOADED && (
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<ImagePreview imageData={baseImage as Uint8ClampedArray} />
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)}
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{appState === AppState.IMAGE_PROCESSED && (
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<ImageOutput imageData={ditheredImage as Uint8ClampedArray} />
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)}
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</main>
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</div>
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);
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}
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function wasmWorker(modulePath: string) {
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// Create an object to later interact with
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const proxy: any = {};
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// Keep track of the messages being sent
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// so we can resolve them correctly
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let id = 0;
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let idPromises: any = {};
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return new Promise((resolve, reject) => {
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const worker = new Worker("./worker.js");
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worker.postMessage({ eventType: "INITIALISE", eventData: modulePath });
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worker.addEventListener("message", function (event: any) {
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const { eventType, eventData, eventId } = event.data;
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if (eventType === "INITIALISED") {
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const methods = event.data.eventData;
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methods.forEach((method: any) => {
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proxy[method] = (...args: any[]) => {
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return new Promise((resolve, reject) => {
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worker.postMessage({
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eventType: "CALL",
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eventData: {
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method: method,
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arguments: Array.from(args),
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},
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eventId: id,
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});
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idPromises[id] = { resolve, reject };
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id++;
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});
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};
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});
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resolve(proxy);
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return;
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} else if (eventType === "RESULT") {
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if (eventId !== undefined && idPromises[eventId]) {
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idPromises[eventId].resolve(eventData);
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delete idPromises[eventId];
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}
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} else if (eventType === "ERROR") {
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if (eventId !== undefined && idPromises[eventId]) {
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idPromises[eventId].reject(event.data.eventData);
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delete idPromises[eventId];
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}
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}
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});
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worker.addEventListener("error", function (error: any) {
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reject(error);
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});
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});
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}
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export default App;
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68
client/src/Ditherer.ts
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68
client/src/Ditherer.ts
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class Ditherer {
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async dither(image: Uint8ClampedArray): Promise<Uint8ClampedArray> {
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const worker: any = await wasmWorker("/main.wasm");
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let output: Uint8ClampedArray;
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output = await worker.dither(image);
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worker.terminate();
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return output;
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}
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}
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function wasmWorker(modulePath: string) {
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// Create an object to later interact with
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const proxy: any = {};
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// Keep track of the messages being sent
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// so we can resolve them correctly
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let id = 0;
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let idPromises: any = {};
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return new Promise((resolve, reject) => {
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const worker = new Worker("./worker.js");
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proxy.terminate = () => worker.terminate();
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worker.postMessage({ eventType: "INITIALISE", eventData: modulePath });
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worker.addEventListener("message", function (event: any) {
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const { eventType, eventData, eventId } = event.data;
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if (eventType === "INITIALISED") {
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const methods = event.data.eventData;
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methods.forEach((method: any) => {
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proxy[method] = (...args: any[]) => {
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return new Promise((resolve, reject) => {
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worker.postMessage({
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eventType: "CALL",
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eventData: {
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method: method,
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arguments: Array.from(args),
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},
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eventId: id,
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});
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idPromises[id] = { resolve, reject };
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id++;
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});
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};
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});
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resolve(proxy);
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return;
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} else if (eventType === "RESULT") {
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if (eventId !== undefined && idPromises[eventId]) {
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idPromises[eventId].resolve(eventData);
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delete idPromises[eventId];
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}
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} else if (eventType === "ERROR") {
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if (eventId !== undefined && idPromises[eventId]) {
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idPromises[eventId].reject(event.data.eventData);
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delete idPromises[eventId];
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}
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}
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});
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worker.addEventListener("error", function (error: any) {
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reject(error);
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});
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});
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}
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export default Ditherer;
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23
client/src/Header.tsx
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23
client/src/Header.tsx
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import { faGithub } from "@fortawesome/free-brands-svg-icons";
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import { faIgloo } from "@fortawesome/free-solid-svg-icons";
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import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
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function Header() {
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return (
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<header className="bg-nord-1 text-nord-5 py-3 px-2">
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<a href="https://github.com/CrispyBaguette/wasm-palette-converter">
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<FontAwesomeIcon
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icon={faGithub}
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className="fa-2x hover:text-nord-7 mx-2"
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/>
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</a>
|
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<a href="https://blog.bruyant.xyz">
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<FontAwesomeIcon
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icon={faIgloo}
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className="fa-2x hover:text-nord-7 mx-2"
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/>
|
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</a>
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</header>
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);
|
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}
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export default Header;
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64
client/src/ImageInput.tsx
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64
client/src/ImageInput.tsx
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|
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import React, { FormEventHandler } from "react";
|
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|
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interface Props {
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onImageSubmit: (image: Uint8ClampedArray) => void;
|
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}
|
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|
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function ImageInput({ onImageSubmit }: Props) {
|
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let fileReader: FileReader;
|
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const fileInputRef = React.useRef<HTMLInputElement>(null);
|
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|
||||
const handleSubmit: FormEventHandler = (e) => {
|
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e.preventDefault();
|
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if (
|
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!fileInputRef.current ||
|
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!fileInputRef.current.files ||
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||||
fileInputRef.current.files.length === 0
|
||||
) {
|
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return;
|
||||
}
|
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|
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fileReader = new FileReader();
|
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fileReader.onloadend = handleFileRead;
|
||||
fileReader.readAsArrayBuffer(fileInputRef.current.files[0]);
|
||||
};
|
||||
|
||||
const handleFileRead: EventListener = (e) => {
|
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if (fileReader.result) {
|
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const image = new Uint8ClampedArray(fileReader.result as ArrayBuffer);
|
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onImageSubmit(image);
|
||||
}
|
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};
|
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|
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return (
|
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<form
|
||||
className="grid grid-cols-1 max-w-md mx-auto my-4 px-2"
|
||||
onSubmit={handleSubmit}
|
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>
|
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<label className="block">
|
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<span>Select an image:</span>
|
||||
<input
|
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type="file"
|
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accept="image/png, image/jpeg"
|
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ref={fileInputRef}
|
||||
className="block w-full mt-1 text-sm text-nord-0 file:mr-4 file:py-2 file:px-4 file:border-0 file:text-sm file:font-semibold file:bg-nord-4 file:text-nord-0 hover:file:bg-nord-5"
|
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/>
|
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</label>
|
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{/* <label>
|
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<span className="block">Select a color palette:</span>
|
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<select className="form-select block w-full mt-1">
|
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<option value="nord">Nord</option>
|
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</select>
|
||||
</label> */}
|
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<button
|
||||
type="submit"
|
||||
value="Go"
|
||||
className="block w-32 mx-auto mt-1 py-2 px-4 text-sm text-nord-0 bg-nord-4 hover:bg-nord-5"
|
||||
>
|
||||
Go
|
||||
</button>
|
||||
</form>
|
||||
);
|
||||
}
|
||||
|
||||
export default ImageInput;
|
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10
client/src/ImageOutput.css
Normal file
10
client/src/ImageOutput.css
Normal file
@ -0,0 +1,10 @@
|
||||
img {
|
||||
image-rendering: optimizeSpeed;
|
||||
image-rendering: -moz-crisp-edges;
|
||||
image-rendering: -o-crisp-edges;
|
||||
image-rendering: -webkit-optimize-contrast;
|
||||
image-rendering: optimize-contrast;
|
||||
image-rendering: crisp-edges;
|
||||
image-rendering: pixelated;
|
||||
-ms-interpolation-mode: nearest-neighbor;
|
||||
}
|
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41
client/src/ImageOutput.tsx
Normal file
41
client/src/ImageOutput.tsx
Normal file
@ -0,0 +1,41 @@
|
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import FileSaver from "file-saver";
|
||||
import "./ImageOutput.css";
|
||||
|
||||
interface OutputProps {
|
||||
imageData: Uint8ClampedArray;
|
||||
}
|
||||
|
||||
function ImageOutput({ imageData }: OutputProps) {
|
||||
const imageBlob = new Blob([imageData], { type: "image/png" });
|
||||
const imageUrl = URL.createObjectURL(imageBlob);
|
||||
|
||||
const handleClick = () => {
|
||||
FileSaver.saveAs(imageBlob, "image.png");
|
||||
};
|
||||
|
||||
return (
|
||||
<div className="mx-auto">
|
||||
<img
|
||||
alt="dithering output"
|
||||
src={imageUrl}
|
||||
className="object-contain max-h-96 max-w-96 mx-auto"
|
||||
/>
|
||||
<button
|
||||
onClick={handleClick}
|
||||
className="block w-48 mx-auto mt-1 py-2 px-4 text-sm text-nord-0 bg-nord-4 hover:bg-nord-5"
|
||||
>
|
||||
Download
|
||||
</button>
|
||||
<a
|
||||
href={imageUrl}
|
||||
target="_blank"
|
||||
rel="noopener noreferrer"
|
||||
className="block w-48 mx-auto mt-1 py-2 px-4 text-sm text-nord-0 bg-nord-4 hover:bg-nord-5"
|
||||
>
|
||||
Open in new tab
|
||||
</a>
|
||||
</div>
|
||||
);
|
||||
}
|
||||
|
||||
export default ImageOutput;
|
||||
24
client/src/ImagePreview.tsx
Normal file
24
client/src/ImagePreview.tsx
Normal file
@ -0,0 +1,24 @@
|
||||
import { faSpinner } from "@fortawesome/free-solid-svg-icons";
|
||||
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
|
||||
import classNames from "classnames";
|
||||
|
||||
interface ImagePreviewProps {
|
||||
imageData: Uint8ClampedArray;
|
||||
}
|
||||
|
||||
function ImagePreview({ imageData }: ImagePreviewProps) {
|
||||
const imageBlob = new Blob([imageData], { type: "image/png" });
|
||||
const imageUrl = URL.createObjectURL(imageBlob);
|
||||
|
||||
return (
|
||||
<div className="blur-sm mx-auto">
|
||||
<img
|
||||
alt="preview"
|
||||
src={imageUrl}
|
||||
className="object-contain max-h-96 max-w-96 mx-auto"
|
||||
/>
|
||||
</div>
|
||||
);
|
||||
}
|
||||
|
||||
export default ImagePreview;
|
||||
@ -1,41 +1,22 @@
|
||||
@media (prefers-color-scheme: dark) {
|
||||
body {
|
||||
color: #fff;
|
||||
background: #000;
|
||||
}
|
||||
a:link {
|
||||
color: #9cf;
|
||||
}
|
||||
a:hover,
|
||||
a:visited:hover {
|
||||
color: #cef;
|
||||
}
|
||||
a:visited {
|
||||
color: #c9f;
|
||||
}
|
||||
}
|
||||
body {
|
||||
margin: 1em auto;
|
||||
max-width: 40em;
|
||||
padding: 0 0.62em;
|
||||
font: 1.2em/1.62 sans-serif;
|
||||
}
|
||||
h1,
|
||||
h2,
|
||||
h3 {
|
||||
line-height: 1.2;
|
||||
}
|
||||
.container {
|
||||
display: flex;
|
||||
flex-direction: column;
|
||||
justify-content: center;
|
||||
}
|
||||
#output {
|
||||
max-width: 100%;
|
||||
align-self: center;
|
||||
}
|
||||
@media print {
|
||||
body {
|
||||
max-width: none;
|
||||
}
|
||||
@tailwind base;
|
||||
@tailwind components;
|
||||
@tailwind utilities;
|
||||
|
||||
:root {
|
||||
--nord-0: #2e3440;
|
||||
--nord-1: #3b4252;
|
||||
--nord-2: #434c5e;
|
||||
--nord-3: #4c566a;
|
||||
--nord-4: #d8dee9;
|
||||
--nord-5: #e5e9f0;
|
||||
--nord-6: #eceff4;
|
||||
--nord-7: #8fbcbb;
|
||||
--nord-8: #88c0d0;
|
||||
--nord-9: #81a1c1;
|
||||
--nord-10: #5e81ac;
|
||||
--nord-11: #bf616a;
|
||||
--nord-12: #d08770;
|
||||
--nord-13: #ebcb8b;
|
||||
--nord-14: #a3be8c;
|
||||
--nord-15: #b48ead;
|
||||
}
|
||||
|
||||
54
client/tailwind.config.js
Normal file
54
client/tailwind.config.js
Normal file
@ -0,0 +1,54 @@
|
||||
module.exports = {
|
||||
content: ["./src/**/*.{ts,tsx}", "./public/index.html}"],
|
||||
theme: {
|
||||
extend: {
|
||||
colors: {
|
||||
nord: {
|
||||
0: "var(--nord-0)",
|
||||
1: "var(--nord-1)",
|
||||
2: "var(--nord-2)",
|
||||
3: "var(--nord-3)",
|
||||
4: "var(--nord-4)",
|
||||
5: "var(--nord-5)",
|
||||
6: "var(--nord-6)",
|
||||
7: "var(--nord-7)",
|
||||
8: "var(--nord-8)",
|
||||
9: "var(--nord-9)",
|
||||
10: "var(--nord-10)",
|
||||
11: "var(--nord-11)",
|
||||
12: "var(--nord-12)",
|
||||
13: "var(--nord-13)",
|
||||
14: "var(--nord-14)",
|
||||
15: "var(--nord-15)",
|
||||
},
|
||||
polar: {
|
||||
1: "var(--nord-0)",
|
||||
2: "var(--nord-1)",
|
||||
3: "var(--nord-2)",
|
||||
4: "var(--nord-3)",
|
||||
},
|
||||
snow: {
|
||||
1: "var(--nord-4)",
|
||||
2: "var(--nord-5)",
|
||||
3: "var(--nord-6)",
|
||||
},
|
||||
frost: {
|
||||
1: "var(--nord-7)",
|
||||
2: "var(--nord-8)",
|
||||
3: "var(--nord-9)",
|
||||
4: "var(--nord-10)",
|
||||
},
|
||||
aurora: {
|
||||
1: "var(--nord-11)",
|
||||
2: "var(--nord-12)",
|
||||
3: "var(--nord-13)",
|
||||
4: "var(--nord-14)",
|
||||
5: "var(--nord-15)",
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
variants: {},
|
||||
plugins: [require("@tailwindcss/forms")],
|
||||
safelist: ["bg-black"],
|
||||
};
|
||||
@ -4,7 +4,7 @@
|
||||
"lib": [
|
||||
"dom",
|
||||
"dom.iterable",
|
||||
"esnext"
|
||||
"esnext",
|
||||
],
|
||||
"allowJs": true,
|
||||
"skipLibCheck": true,
|
||||
|
||||
91
dist/index.html
vendored
91
dist/index.html
vendored
@ -1,91 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta charset="utf-8" />
|
||||
<script type="module" src="./wasm_exec.js"></script>
|
||||
<script type="module" src="./main.js"></script>
|
||||
<style>
|
||||
@media (prefers-color-scheme: dark) {
|
||||
body {
|
||||
color: #fff;
|
||||
background: #000;
|
||||
}
|
||||
a:link {
|
||||
color: #9cf;
|
||||
}
|
||||
a:hover,
|
||||
a:visited:hover {
|
||||
color: #cef;
|
||||
}
|
||||
a:visited {
|
||||
color: #c9f;
|
||||
}
|
||||
}
|
||||
body {
|
||||
margin: 1em auto;
|
||||
max-width: 40em;
|
||||
padding: 0 0.62em;
|
||||
font: 1.2em/1.62 sans-serif;
|
||||
}
|
||||
h1,
|
||||
h2,
|
||||
h3 {
|
||||
line-height: 1.2;
|
||||
}
|
||||
.container {
|
||||
display: flex;
|
||||
flex-direction: column;
|
||||
justify-content: center;
|
||||
}
|
||||
#output {
|
||||
max-width: 100%;
|
||||
align-self: center;
|
||||
}
|
||||
@media print {
|
||||
body {
|
||||
max-width: none;
|
||||
}
|
||||
}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<article>
|
||||
<h1>Go+Wasm image dithering tool</h1>
|
||||
<aside>Featuring the Nord Color Palette</aside>
|
||||
<p>
|
||||
Load an image, click Go and wait (potentially for a while) for the image
|
||||
to be dithered using the Nord color palette and the Floyd-Steinberg
|
||||
algorithm.
|
||||
</p>
|
||||
<p>
|
||||
Running in the browser with Wasm causes a bit of a performance penalty.
|
||||
Multithreading is not available (not that it matters much since
|
||||
Floyd-Steinberg is single-threaded), and sending data back and forth
|
||||
between JS and Wasm can take a little while.
|
||||
</p>
|
||||
<p>
|
||||
I've re-used code from
|
||||
<a
|
||||
href="https://www.sitepen.com/blog/using-webassembly-with-web-workers"
|
||||
>this article</a
|
||||
>
|
||||
to make the Wasm code run in a web worker, with some adaptations for Go
|
||||
oddities.
|
||||
</p>
|
||||
<p>
|
||||
If you're into that sort of thing, source code is available on
|
||||
<a href="https://github.com/CrispyBaguette/wasm-palette-converter"
|
||||
>GitHub</a
|
||||
>.
|
||||
</p>
|
||||
<form>
|
||||
<input type="file" id="source-image" accept="image/png, image/jpeg" />
|
||||
<button id="go-btn" type="button" disabled>Go</button>
|
||||
</form>
|
||||
<a id="output-wrapper" download="output.png">
|
||||
<div class="container">
|
||||
<img id="output" />
|
||||
</div>
|
||||
</a>
|
||||
</article>
|
||||
</body>
|
||||
</html>
|
||||
94
dist/main.js
vendored
94
dist/main.js
vendored
@ -1,94 +0,0 @@
|
||||
const fileInput = document.getElementById("source-image");
|
||||
const btn = document.getElementById("go-btn");
|
||||
const output = document.getElementById("output");
|
||||
const outputWrapper = document.getElementById("output-wrapper");
|
||||
|
||||
function wasmWorker(modulePath) {
|
||||
// Create an object to later interact with
|
||||
const proxy = {};
|
||||
|
||||
// Keep track of the messages being sent
|
||||
// so we can resolve them correctly
|
||||
let id = 0;
|
||||
let idPromises = {};
|
||||
|
||||
return new Promise((resolve, reject) => {
|
||||
const worker = new Worker("worker.js");
|
||||
worker.postMessage({ eventType: "INITIALISE", eventData: modulePath });
|
||||
worker.addEventListener("message", function (event) {
|
||||
const { eventType, eventData, eventId } = event.data;
|
||||
|
||||
if (eventType === "INITIALISED") {
|
||||
const methods = event.data.eventData;
|
||||
methods.forEach((method) => {
|
||||
proxy[method] = function () {
|
||||
return new Promise((resolve, reject) => {
|
||||
worker.postMessage({
|
||||
eventType: "CALL",
|
||||
eventData: {
|
||||
method: method,
|
||||
arguments: Array.from(arguments), // arguments is not an array
|
||||
},
|
||||
eventId: id,
|
||||
});
|
||||
|
||||
idPromises[id] = { resolve, reject };
|
||||
id++;
|
||||
});
|
||||
};
|
||||
});
|
||||
resolve(proxy);
|
||||
return;
|
||||
} else if (eventType === "RESULT") {
|
||||
if (eventId !== undefined && idPromises[eventId]) {
|
||||
idPromises[eventId].resolve(eventData);
|
||||
delete idPromises[eventId];
|
||||
}
|
||||
} else if (eventType === "ERROR") {
|
||||
if (eventId !== undefined && idPromises[eventId]) {
|
||||
idPromises[eventId].reject(event.data.eventData);
|
||||
delete idPromises[eventId];
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
worker.addEventListener("error", function (error) {
|
||||
reject(error);
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
let workerResolve;
|
||||
const wasmReady = new Promise((resolve) => {
|
||||
workerResolve = resolve;
|
||||
});
|
||||
|
||||
let workerProxy;
|
||||
wasmWorker("./main.wasm").then((w) => {
|
||||
workerProxy = w;
|
||||
workerResolve();
|
||||
btn.removeAttribute("disabled");
|
||||
});
|
||||
|
||||
btn.addEventListener("click", async () => {
|
||||
// Clear image
|
||||
output.src = "";
|
||||
|
||||
// Check if a file was selected
|
||||
if (fileInput.files.length === 0) {
|
||||
alert("No file selected");
|
||||
return;
|
||||
}
|
||||
const reader = new FileReader();
|
||||
reader.readAsArrayBuffer(fileInput.files[0]);
|
||||
reader.onloadend = async (evt) => {
|
||||
if (evt.target.readyState === FileReader.DONE) {
|
||||
const imageData = new Uint8Array(evt.target.result);
|
||||
const ditheredImage = await workerProxy.DitherNord(imageData);
|
||||
|
||||
const outputValue = `data:image/png;base64,${ditheredImage}`;
|
||||
output.src = outputValue;
|
||||
outputWrapper.href = outputValue;
|
||||
}
|
||||
};
|
||||
});
|
||||
636
dist/wasm_exec.js
vendored
636
dist/wasm_exec.js
vendored
@ -1,636 +0,0 @@
|
||||
// Copyright 2018 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
(() => {
|
||||
// Map multiple JavaScript environments to a single common API,
|
||||
// preferring web standards over Node.js API.
|
||||
//
|
||||
// Environments considered:
|
||||
// - Browsers
|
||||
// - Node.js
|
||||
// - Electron
|
||||
// - Parcel
|
||||
// - Webpack
|
||||
|
||||
if (typeof global !== "undefined") {
|
||||
// global already exists
|
||||
} else if (typeof window !== "undefined") {
|
||||
window.global = window;
|
||||
} else if (typeof self !== "undefined") {
|
||||
self.global = self;
|
||||
} else {
|
||||
throw new Error("cannot export Go (neither global, window nor self is defined)");
|
||||
}
|
||||
|
||||
if (!global.require && typeof require !== "undefined") {
|
||||
global.require = require;
|
||||
}
|
||||
|
||||
if (!global.fs && global.require) {
|
||||
const fs = require("fs");
|
||||
if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
|
||||
global.fs = fs;
|
||||
}
|
||||
}
|
||||
|
||||
const enosys = () => {
|
||||
const err = new Error("not implemented");
|
||||
err.code = "ENOSYS";
|
||||
return err;
|
||||
};
|
||||
|
||||
if (!global.fs) {
|
||||
let outputBuf = "";
|
||||
global.fs = {
|
||||
constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
|
||||
writeSync(fd, buf) {
|
||||
outputBuf += decoder.decode(buf);
|
||||
const nl = outputBuf.lastIndexOf("\n");
|
||||
if (nl != -1) {
|
||||
console.log(outputBuf.substr(0, nl));
|
||||
outputBuf = outputBuf.substr(nl + 1);
|
||||
}
|
||||
return buf.length;
|
||||
},
|
||||
write(fd, buf, offset, length, position, callback) {
|
||||
if (offset !== 0 || length !== buf.length || position !== null) {
|
||||
callback(enosys());
|
||||
return;
|
||||
}
|
||||
const n = this.writeSync(fd, buf);
|
||||
callback(null, n);
|
||||
},
|
||||
chmod(path, mode, callback) { callback(enosys()); },
|
||||
chown(path, uid, gid, callback) { callback(enosys()); },
|
||||
close(fd, callback) { callback(enosys()); },
|
||||
fchmod(fd, mode, callback) { callback(enosys()); },
|
||||
fchown(fd, uid, gid, callback) { callback(enosys()); },
|
||||
fstat(fd, callback) { callback(enosys()); },
|
||||
fsync(fd, callback) { callback(null); },
|
||||
ftruncate(fd, length, callback) { callback(enosys()); },
|
||||
lchown(path, uid, gid, callback) { callback(enosys()); },
|
||||
link(path, link, callback) { callback(enosys()); },
|
||||
lstat(path, callback) { callback(enosys()); },
|
||||
mkdir(path, perm, callback) { callback(enosys()); },
|
||||
open(path, flags, mode, callback) { callback(enosys()); },
|
||||
read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
|
||||
readdir(path, callback) { callback(enosys()); },
|
||||
readlink(path, callback) { callback(enosys()); },
|
||||
rename(from, to, callback) { callback(enosys()); },
|
||||
rmdir(path, callback) { callback(enosys()); },
|
||||
stat(path, callback) { callback(enosys()); },
|
||||
symlink(path, link, callback) { callback(enosys()); },
|
||||
truncate(path, length, callback) { callback(enosys()); },
|
||||
unlink(path, callback) { callback(enosys()); },
|
||||
utimes(path, atime, mtime, callback) { callback(enosys()); },
|
||||
};
|
||||
}
|
||||
|
||||
if (!global.process) {
|
||||
global.process = {
|
||||
getuid() { return -1; },
|
||||
getgid() { return -1; },
|
||||
geteuid() { return -1; },
|
||||
getegid() { return -1; },
|
||||
getgroups() { throw enosys(); },
|
||||
pid: -1,
|
||||
ppid: -1,
|
||||
umask() { throw enosys(); },
|
||||
cwd() { throw enosys(); },
|
||||
chdir() { throw enosys(); },
|
||||
}
|
||||
}
|
||||
|
||||
if (!global.crypto && global.require) {
|
||||
const nodeCrypto = require("crypto");
|
||||
global.crypto = {
|
||||
getRandomValues(b) {
|
||||
nodeCrypto.randomFillSync(b);
|
||||
},
|
||||
};
|
||||
}
|
||||
if (!global.crypto) {
|
||||
throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
|
||||
}
|
||||
|
||||
if (!global.performance) {
|
||||
global.performance = {
|
||||
now() {
|
||||
const [sec, nsec] = process.hrtime();
|
||||
return sec * 1000 + nsec / 1000000;
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
if (!global.TextEncoder && global.require) {
|
||||
global.TextEncoder = require("util").TextEncoder;
|
||||
}
|
||||
if (!global.TextEncoder) {
|
||||
throw new Error("global.TextEncoder is not available, polyfill required");
|
||||
}
|
||||
|
||||
if (!global.TextDecoder && global.require) {
|
||||
global.TextDecoder = require("util").TextDecoder;
|
||||
}
|
||||
if (!global.TextDecoder) {
|
||||
throw new Error("global.TextDecoder is not available, polyfill required");
|
||||
}
|
||||
|
||||
// End of polyfills for common API.
|
||||
|
||||
const encoder = new TextEncoder("utf-8");
|
||||
const decoder = new TextDecoder("utf-8");
|
||||
|
||||
global.Go = class {
|
||||
constructor() {
|
||||
this.argv = ["js"];
|
||||
this.env = {};
|
||||
this.exit = (code) => {
|
||||
if (code !== 0) {
|
||||
console.warn("exit code:", code);
|
||||
}
|
||||
};
|
||||
this._exitPromise = new Promise((resolve) => {
|
||||
this._resolveExitPromise = resolve;
|
||||
});
|
||||
this._pendingEvent = null;
|
||||
this._scheduledTimeouts = new Map();
|
||||
this._nextCallbackTimeoutID = 1;
|
||||
|
||||
const setInt64 = (addr, v) => {
|
||||
this.mem.setUint32(addr + 0, v, true);
|
||||
this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
|
||||
}
|
||||
|
||||
const getInt64 = (addr) => {
|
||||
const low = this.mem.getUint32(addr + 0, true);
|
||||
const high = this.mem.getInt32(addr + 4, true);
|
||||
return low + high * 4294967296;
|
||||
}
|
||||
|
||||
const loadValue = (addr) => {
|
||||
const f = this.mem.getFloat64(addr, true);
|
||||
if (f === 0) {
|
||||
return undefined;
|
||||
}
|
||||
if (!isNaN(f)) {
|
||||
return f;
|
||||
}
|
||||
|
||||
const id = this.mem.getUint32(addr, true);
|
||||
return this._values[id];
|
||||
}
|
||||
|
||||
const storeValue = (addr, v) => {
|
||||
const nanHead = 0x7FF80000;
|
||||
|
||||
if (typeof v === "number" && v !== 0) {
|
||||
if (isNaN(v)) {
|
||||
this.mem.setUint32(addr + 4, nanHead, true);
|
||||
this.mem.setUint32(addr, 0, true);
|
||||
return;
|
||||
}
|
||||
this.mem.setFloat64(addr, v, true);
|
||||
return;
|
||||
}
|
||||
|
||||
if (v === undefined) {
|
||||
this.mem.setFloat64(addr, 0, true);
|
||||
return;
|
||||
}
|
||||
|
||||
let id = this._ids.get(v);
|
||||
if (id === undefined) {
|
||||
id = this._idPool.pop();
|
||||
if (id === undefined) {
|
||||
id = this._values.length;
|
||||
}
|
||||
this._values[id] = v;
|
||||
this._goRefCounts[id] = 0;
|
||||
this._ids.set(v, id);
|
||||
}
|
||||
this._goRefCounts[id]++;
|
||||
let typeFlag = 0;
|
||||
switch (typeof v) {
|
||||
case "object":
|
||||
if (v !== null) {
|
||||
typeFlag = 1;
|
||||
}
|
||||
break;
|
||||
case "string":
|
||||
typeFlag = 2;
|
||||
break;
|
||||
case "symbol":
|
||||
typeFlag = 3;
|
||||
break;
|
||||
case "function":
|
||||
typeFlag = 4;
|
||||
break;
|
||||
}
|
||||
this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
|
||||
this.mem.setUint32(addr, id, true);
|
||||
}
|
||||
|
||||
const loadSlice = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
|
||||
}
|
||||
|
||||
const loadSliceOfValues = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
const a = new Array(len);
|
||||
for (let i = 0; i < len; i++) {
|
||||
a[i] = loadValue(array + i * 8);
|
||||
}
|
||||
return a;
|
||||
}
|
||||
|
||||
const loadString = (addr) => {
|
||||
const saddr = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
|
||||
}
|
||||
|
||||
const timeOrigin = Date.now() - performance.now();
|
||||
this.importObject = {
|
||||
go: {
|
||||
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
|
||||
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
|
||||
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
|
||||
// This changes the SP, thus we have to update the SP used by the imported function.
|
||||
|
||||
// func wasmExit(code int32)
|
||||
"runtime.wasmExit": (sp) => {
|
||||
sp >>>= 0;
|
||||
const code = this.mem.getInt32(sp + 8, true);
|
||||
this.exited = true;
|
||||
delete this._inst;
|
||||
delete this._values;
|
||||
delete this._goRefCounts;
|
||||
delete this._ids;
|
||||
delete this._idPool;
|
||||
this.exit(code);
|
||||
},
|
||||
|
||||
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
|
||||
"runtime.wasmWrite": (sp) => {
|
||||
sp >>>= 0;
|
||||
const fd = getInt64(sp + 8);
|
||||
const p = getInt64(sp + 16);
|
||||
const n = this.mem.getInt32(sp + 24, true);
|
||||
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
|
||||
},
|
||||
|
||||
// func resetMemoryDataView()
|
||||
"runtime.resetMemoryDataView": (sp) => {
|
||||
sp >>>= 0;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
},
|
||||
|
||||
// func nanotime1() int64
|
||||
"runtime.nanotime1": (sp) => {
|
||||
sp >>>= 0;
|
||||
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
|
||||
},
|
||||
|
||||
// func walltime() (sec int64, nsec int32)
|
||||
"runtime.walltime": (sp) => {
|
||||
sp >>>= 0;
|
||||
const msec = (new Date).getTime();
|
||||
setInt64(sp + 8, msec / 1000);
|
||||
this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
|
||||
},
|
||||
|
||||
// func scheduleTimeoutEvent(delay int64) int32
|
||||
"runtime.scheduleTimeoutEvent": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this._nextCallbackTimeoutID;
|
||||
this._nextCallbackTimeoutID++;
|
||||
this._scheduledTimeouts.set(id, setTimeout(
|
||||
() => {
|
||||
this._resume();
|
||||
while (this._scheduledTimeouts.has(id)) {
|
||||
// for some reason Go failed to register the timeout event, log and try again
|
||||
// (temporary workaround for https://github.com/golang/go/issues/28975)
|
||||
console.warn("scheduleTimeoutEvent: missed timeout event");
|
||||
this._resume();
|
||||
}
|
||||
},
|
||||
getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
|
||||
));
|
||||
this.mem.setInt32(sp + 16, id, true);
|
||||
},
|
||||
|
||||
// func clearTimeoutEvent(id int32)
|
||||
"runtime.clearTimeoutEvent": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this.mem.getInt32(sp + 8, true);
|
||||
clearTimeout(this._scheduledTimeouts.get(id));
|
||||
this._scheduledTimeouts.delete(id);
|
||||
},
|
||||
|
||||
// func getRandomData(r []byte)
|
||||
"runtime.getRandomData": (sp) => {
|
||||
sp >>>= 0;
|
||||
crypto.getRandomValues(loadSlice(sp + 8));
|
||||
},
|
||||
|
||||
// func finalizeRef(v ref)
|
||||
"syscall/js.finalizeRef": (sp) => {
|
||||
sp >>>= 0;
|
||||
const id = this.mem.getUint32(sp + 8, true);
|
||||
this._goRefCounts[id]--;
|
||||
if (this._goRefCounts[id] === 0) {
|
||||
const v = this._values[id];
|
||||
this._values[id] = null;
|
||||
this._ids.delete(v);
|
||||
this._idPool.push(id);
|
||||
}
|
||||
},
|
||||
|
||||
// func stringVal(value string) ref
|
||||
"syscall/js.stringVal": (sp) => {
|
||||
sp >>>= 0;
|
||||
storeValue(sp + 24, loadString(sp + 8));
|
||||
},
|
||||
|
||||
// func valueGet(v ref, p string) ref
|
||||
"syscall/js.valueGet": (sp) => {
|
||||
sp >>>= 0;
|
||||
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 32, result);
|
||||
},
|
||||
|
||||
// func valueSet(v ref, p string, x ref)
|
||||
"syscall/js.valueSet": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
|
||||
},
|
||||
|
||||
// func valueDelete(v ref, p string)
|
||||
"syscall/js.valueDelete": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
|
||||
},
|
||||
|
||||
// func valueIndex(v ref, i int) ref
|
||||
"syscall/js.valueIndex": (sp) => {
|
||||
sp >>>= 0;
|
||||
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
|
||||
},
|
||||
|
||||
// valueSetIndex(v ref, i int, x ref)
|
||||
"syscall/js.valueSetIndex": (sp) => {
|
||||
sp >>>= 0;
|
||||
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
|
||||
},
|
||||
|
||||
// func valueCall(v ref, m string, args []ref) (ref, bool)
|
||||
"syscall/js.valueCall": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const m = Reflect.get(v, loadString(sp + 16));
|
||||
const args = loadSliceOfValues(sp + 32);
|
||||
const result = Reflect.apply(m, v, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 56, result);
|
||||
this.mem.setUint8(sp + 64, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 56, err);
|
||||
this.mem.setUint8(sp + 64, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueInvoke(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueInvoke": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.apply(v, undefined, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueNew(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueNew": (sp) => {
|
||||
sp >>>= 0;
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.construct(v, args);
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueLength(v ref) int
|
||||
"syscall/js.valueLength": (sp) => {
|
||||
sp >>>= 0;
|
||||
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
||||
},
|
||||
|
||||
// valuePrepareString(v ref) (ref, int)
|
||||
"syscall/js.valuePrepareString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = encoder.encode(String(loadValue(sp + 8)));
|
||||
storeValue(sp + 16, str);
|
||||
setInt64(sp + 24, str.length);
|
||||
},
|
||||
|
||||
// valueLoadString(v ref, b []byte)
|
||||
"syscall/js.valueLoadString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = loadValue(sp + 8);
|
||||
loadSlice(sp + 16).set(str);
|
||||
},
|
||||
|
||||
// func valueInstanceOf(v ref, t ref) bool
|
||||
"syscall/js.valueInstanceOf": (sp) => {
|
||||
sp >>>= 0;
|
||||
this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
|
||||
},
|
||||
|
||||
// func copyBytesToGo(dst []byte, src ref) (int, bool)
|
||||
"syscall/js.copyBytesToGo": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadSlice(sp + 8);
|
||||
const src = loadValue(sp + 32);
|
||||
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
// func copyBytesToJS(dst ref, src []byte) (int, bool)
|
||||
"syscall/js.copyBytesToJS": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadValue(sp + 8);
|
||||
const src = loadSlice(sp + 16);
|
||||
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
"debug": (value) => {
|
||||
console.log(value);
|
||||
},
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
async run(instance) {
|
||||
if (!(instance instanceof WebAssembly.Instance)) {
|
||||
throw new Error("Go.run: WebAssembly.Instance expected");
|
||||
}
|
||||
this._inst = instance;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
this._values = [ // JS values that Go currently has references to, indexed by reference id
|
||||
NaN,
|
||||
0,
|
||||
null,
|
||||
true,
|
||||
false,
|
||||
global,
|
||||
this,
|
||||
];
|
||||
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
||||
this._ids = new Map([ // mapping from JS values to reference ids
|
||||
[0, 1],
|
||||
[null, 2],
|
||||
[true, 3],
|
||||
[false, 4],
|
||||
[global, 5],
|
||||
[this, 6],
|
||||
]);
|
||||
this._idPool = []; // unused ids that have been garbage collected
|
||||
this.exited = false; // whether the Go program has exited
|
||||
|
||||
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
||||
let offset = 4096;
|
||||
|
||||
const strPtr = (str) => {
|
||||
const ptr = offset;
|
||||
const bytes = encoder.encode(str + "\0");
|
||||
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
||||
offset += bytes.length;
|
||||
if (offset % 8 !== 0) {
|
||||
offset += 8 - (offset % 8);
|
||||
}
|
||||
return ptr;
|
||||
};
|
||||
|
||||
const argc = this.argv.length;
|
||||
|
||||
const argvPtrs = [];
|
||||
this.argv.forEach((arg) => {
|
||||
argvPtrs.push(strPtr(arg));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const keys = Object.keys(this.env).sort();
|
||||
keys.forEach((key) => {
|
||||
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const argv = offset;
|
||||
argvPtrs.forEach((ptr) => {
|
||||
this.mem.setUint32(offset, ptr, true);
|
||||
this.mem.setUint32(offset + 4, 0, true);
|
||||
offset += 8;
|
||||
});
|
||||
|
||||
// The linker guarantees global data starts from at least wasmMinDataAddr.
|
||||
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
|
||||
const wasmMinDataAddr = 4096 + 8192;
|
||||
if (offset >= wasmMinDataAddr) {
|
||||
throw new Error("total length of command line and environment variables exceeds limit");
|
||||
}
|
||||
|
||||
this._inst.exports.run(argc, argv);
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
await this._exitPromise;
|
||||
}
|
||||
|
||||
_resume() {
|
||||
if (this.exited) {
|
||||
throw new Error("Go program has already exited");
|
||||
}
|
||||
this._inst.exports.resume();
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
}
|
||||
|
||||
_makeFuncWrapper(id) {
|
||||
const go = this;
|
||||
return function () {
|
||||
const event = { id: id, this: this, args: arguments };
|
||||
go._pendingEvent = event;
|
||||
go._resume();
|
||||
return event.result;
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
if (
|
||||
typeof module !== "undefined" &&
|
||||
global.require &&
|
||||
global.require.main === module &&
|
||||
global.process &&
|
||||
global.process.versions &&
|
||||
!global.process.versions.electron
|
||||
) {
|
||||
if (process.argv.length < 3) {
|
||||
console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
||||
process.exit(1);
|
||||
}
|
||||
|
||||
const go = new Go();
|
||||
go.argv = process.argv.slice(2);
|
||||
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
|
||||
go.exit = process.exit;
|
||||
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
||||
process.on("exit", (code) => { // Node.js exits if no event handler is pending
|
||||
if (code === 0 && !go.exited) {
|
||||
// deadlock, make Go print error and stack traces
|
||||
go._pendingEvent = { id: 0 };
|
||||
go._resume();
|
||||
}
|
||||
});
|
||||
return go.run(result.instance);
|
||||
}).catch((err) => {
|
||||
console.error(err);
|
||||
process.exit(1);
|
||||
});
|
||||
}
|
||||
})();
|
||||
61
dist/worker.js
vendored
61
dist/worker.js
vendored
@ -1,61 +0,0 @@
|
||||
importScripts("./wasm_exec.js");
|
||||
|
||||
if (!WebAssembly.instantiateStreaming) {
|
||||
WebAssembly.instantiateStreaming = async (resp, importObject) => {
|
||||
const source = await (await resp).arrayBuffer();
|
||||
return await WebAssembly.instantiate(source, importObject);
|
||||
};
|
||||
}
|
||||
|
||||
// Create promise to handle Worker calls whilst
|
||||
// module is still initialising
|
||||
let wasmResolve;
|
||||
const wasmReady = new Promise((resolve) => {
|
||||
wasmResolve = resolve;
|
||||
});
|
||||
|
||||
const go = new self.Go();
|
||||
|
||||
addEventListener(
|
||||
"message",
|
||||
async (e) => {
|
||||
const { eventType, eventData, eventId } = e.data;
|
||||
|
||||
if (eventType === "INITIALISE") {
|
||||
const instantiatedSource = await WebAssembly.instantiateStreaming(
|
||||
fetch(eventData),
|
||||
go.importObject
|
||||
);
|
||||
go.run(instantiatedSource.instance);
|
||||
|
||||
// Go does nor exposes the exports in the instantiated module :(((
|
||||
const methods = ["DitherNord"];
|
||||
wasmResolve(methods);
|
||||
postMessage({
|
||||
eventType: "INITIALISED",
|
||||
eventData: methods,
|
||||
});
|
||||
} else if (eventType === "CALL") {
|
||||
await wasmReady;
|
||||
try {
|
||||
const method = self[eventData.method];
|
||||
const result = await method.apply(null, eventData.arguments);
|
||||
self.postMessage({
|
||||
eventType: "RESULT",
|
||||
eventData: result,
|
||||
eventId: eventId,
|
||||
});
|
||||
} catch (e) {
|
||||
console.error(e);
|
||||
self.postMessage({
|
||||
eventType: "ERROR",
|
||||
eventData:
|
||||
"An error occured executing WASM instance function: " +
|
||||
error.toString(),
|
||||
eventId: eventId,
|
||||
});
|
||||
}
|
||||
}
|
||||
},
|
||||
false
|
||||
);
|
||||
@ -5,6 +5,6 @@ import (
|
||||
)
|
||||
|
||||
func main() {
|
||||
js.Global().Set("DitherNord", DitherNord())
|
||||
js.Global().Set("dither", Dither())
|
||||
<-make(chan bool)
|
||||
}
|
||||
|
||||
22
src/wasm.go
22
src/wasm.go
@ -3,6 +3,7 @@ package main
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/hex"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color"
|
||||
_ "image/jpeg"
|
||||
@ -41,6 +42,11 @@ func buildPalette(pal []string) (color.Palette, error) {
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if len(b) != 3 {
|
||||
return nil, fmt.Errorf("invalid color length: %v", len(b))
|
||||
}
|
||||
|
||||
palette[i] = color.RGBA{b[0], b[1], b[2], 0xff}
|
||||
}
|
||||
|
||||
@ -52,8 +58,7 @@ func ditherImage(img image.Image) image.Image {
|
||||
ditherer := dither.NewDitherer(nordPalette)
|
||||
ditherer.Matrix = dither.FloydSteinberg
|
||||
|
||||
// Dither image in a copy
|
||||
dst := ditherer.DitherCopy(img)
|
||||
dst := ditherer.Dither(img)
|
||||
|
||||
return dst
|
||||
}
|
||||
@ -67,9 +72,9 @@ func decodeImage(imageData []byte) (image.Image, error) {
|
||||
return img, nil
|
||||
}
|
||||
|
||||
// DittherNord returns a Promise that takes a UintArray containing a Jpeg or png image,
|
||||
// Dither returns a Promise that takes a UintArray containing a Jpeg or png image,
|
||||
// and resolves to a UintArray containing the dithered image.
|
||||
func DitherNord() js.Func {
|
||||
func Dither() js.Func {
|
||||
return js.FuncOf(func(this js.Value, args []js.Value) interface{} {
|
||||
imageBytes := make([]byte, args[0].Length())
|
||||
js.CopyBytesToGo(imageBytes, args[0])
|
||||
@ -79,6 +84,8 @@ func DitherNord() js.Func {
|
||||
reject := args[1]
|
||||
|
||||
go func() {
|
||||
errorConstructor := js.Global().Get("Error")
|
||||
|
||||
// Decode image from raw bytes
|
||||
img, err := decodeImage(imageBytes)
|
||||
if err != nil {
|
||||
@ -98,7 +105,12 @@ func DitherNord() js.Func {
|
||||
log.Println("Encoding image...")
|
||||
t1 = time.Now()
|
||||
buf := new(bytes.Buffer)
|
||||
png.Encode(buf, ditheredImage)
|
||||
err = png.Encode(buf, ditheredImage)
|
||||
if err != nil {
|
||||
log.Printf("Error encoding image: %v\n", err)
|
||||
errorObject := errorConstructor.New(err.Error())
|
||||
reject.Invoke(errorObject)
|
||||
}
|
||||
t2 = time.Now()
|
||||
log.Printf("Image encoded in %v\n", t2.Sub(t1))
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user