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Delete old oxipng files

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This commit is contained in:
Ingvar Stepanyan
2020-11-19 17:28:03 +00:00
committed by Ingvar Stepanyan
parent beaabe47dc
commit 750872aca6
3 changed files with 0 additions and 86 deletions
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10
codecs/oxipng/index.ts
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@@ -1,10 +0,0 @@
import { threads } from 'wasm-feature-detect';
async function init() {
if (await threads()) {
return (await import('./spawn')).default;
}
return import('./pkg');
}
export default init();

52
codecs/oxipng/spawn.ts
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@@ -1,52 +0,0 @@
import initOxiPNG, {
worker_initializer,
start_main_thread,
optimise,
} from './pkg-parallel';
// @ts-ignore
import wasmUrl from './pkg-parallel/squoosh_oxipng_bg.wasm';
import { WorkerInit } from './worker';
function initWorker(worker: Worker, workerInit: WorkerInit) {
return new Promise((resolve) => {
worker.postMessage(workerInit);
worker.addEventListener('message', () => resolve(), { once: true });
});
}
async function startMainThread() {
const num = navigator.hardwareConcurrency;
// First, let browser fetch and spawn Workers for our pool in the background.
// This is fairly expensive, so we want to start it as early as possible.
const workers = Array.from({ length: num }, () => new Worker('./worker', { type: 'module' }));
// Meanwhile, asynchronously compile, instantiate and initialise Wasm on our main thread.
await initOxiPNG(fetch(wasmUrl), undefined as any);
// Get module+memory from the Wasm instance.
//
// Ideally we wouldn't go via Wasm bindings here, since both are just JS variables, but memory is
// currently not exposed on the Wasm instance correctly by wasm-bindgen.
const workerInit: WorkerInit = worker_initializer(num);
// Once done, we want to send module+memory to each Worker so that they instantiate Wasm too.
// While doing so, we need to wait for Workers to acknowledge that they have received our message.
// Ideally this shouldn't be necessary, but Chromium currently doesn't conform to the spec:
// https://bugs.chromium.org/p/chromium/issues/detail?id=1075645
//
// If we didn't do this ping-pong game, the `start_main_thread` below would block the current
// thread on an atomic before even *sending* the `postMessage` containing memory,
// so Workers would never be able to unblock us back.
await Promise.all(workers.map(worker => initWorker(worker, workerInit)));
// Finally, instantiate rayon pool - this will use shared Wasm memory to send tasks to the
// Workers and then block until they're all ready.
start_main_thread();
return {
optimise,
};
}
export default startMainThread();

24
codecs/oxipng/worker.ts
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@@ -1,24 +0,0 @@
/// <reference lib="webworker" />
import initOxiPNG, { start_worker_thread } from './pkg-parallel';
export type WorkerInit = [WebAssembly.Module, WebAssembly.Memory];
addEventListener(
'message',
async (event) => {
// Tell the "main" thread that we've received the message.
//
// At this point, the "main" thread can run Wasm that
// will synchronously block waiting on other atomics.
//
// Note that we don't need to wait for Wasm instantiation here - it's
// better to start main thread as early as possible, and then it blocks
// on a shared atomic anyway until Worker is fully ready.
postMessage(null);
await initOxiPNG(...(event.data as WorkerInit));
start_worker_thread();
},
{ once: true },
);