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Two workers & worker termination (#198)

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* Refactoring codecs

* Plugging in new processor

* Fixing decorator

* MozJPEG free issue

* Better worker aborting, and terminate workers that aren't used for 10 seconds

* Better comment

* Ooops, half-typed comment

* Uncommenting problematic line

* Surma fixed it!

* Abstracting WASM initialisation

* Better comment

* Don't need this.

* Adding ticket

* noInitalRun

* Reverting MozJPEG issue demo

* Making a const for worker timeout

* Inline docs

* Bail early rather than nesting

* Addressing nits
This commit is contained in:
Jake Archibald
2018-10-28 09:17:43 +00:00
committed by GitHub
parent 02b0c022ca
commit 43def798e1
56 changed files with 778 additions and 688 deletions
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37
src/codecs/optipng/encoder.ts
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@@ -1,23 +1,18 @@
import { canvasEncode, blobToArrayBuffer } from '../../lib/util';
import EncodeWorker from './Encoder.worker';
import optipng, { OptiPngModule } from '../../../codecs/optipng/optipng';
import wasmUrl from '../../../codecs/optipng/optipng.wasm';
import { EncodeOptions } from './encoder-meta';
import { initWasmModule } from '../util';
export interface EncodeOptions {
level: number;
}
export interface EncoderState { type: typeof type; options: EncodeOptions; }
export const type = 'png';
export const label = 'OptiPNG';
export const mimeType = 'image/png';
export const extension = 'png';
export const defaultOptions: EncodeOptions = {
level: 2,
};
export async function encode(data: ImageData, opts: EncodeOptions): Promise<ArrayBuffer> {
const pngBlob = await canvasEncode(data, mimeType);
const pngBuffer = await blobToArrayBuffer(pngBlob);
const encodeWorker = await new EncodeWorker();
return encodeWorker.compress(pngBuffer, opts);
let emscriptenModule: Promise<OptiPngModule>;
export async function compress(data: BufferSource, options: EncodeOptions): Promise<ArrayBuffer> {
if (!emscriptenModule) emscriptenModule = initWasmModule(optipng, wasmUrl);
const module = await emscriptenModule;
const resultView = module.compress(data, options);
const result = new Uint8Array(resultView);
module.free_result();
// wasm can’t run on SharedArrayBuffers, so we hard-cast to ArrayBuffer.
return result.buffer as ArrayBuffer;
}