mirror of https://github.com/vladmandic/human
39 lines
1.7 KiB
JavaScript
39 lines
1.7 KiB
JavaScript
/**
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* Web worker used by main demo app
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* Loaded from index.js
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*/
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/// <reference lib="webworker"/>
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// load Human using IIFE script as Chome Mobile does not support Modules as Workers
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self.importScripts('../dist/human.js');
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let busy = false;
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// @ts-ignore
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// eslint-disable-next-line new-cap, no-undef
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const human = new Human.default();
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onmessage = async (msg) => { // receive message from main thread
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if (busy) return;
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busy = true;
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// received from index.js using:
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// worker.postMessage({ image: image.data.buffer, width: canvas.width, height: canvas.height, config }, [image.data.buffer]);
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const image = new ImageData(new Uint8ClampedArray(msg.data.image), msg.data.width, msg.data.height);
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let result = {};
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result = await human.detect(image, msg.data.userConfig);
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result.tensors = human.tf.engine().state.numTensors; // append to result object so main thread get info
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result.backend = human.tf.getBackend(); // append to result object so main thread get info
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if (result.canvas) { // convert canvas to imageData and send it by reference
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const canvas = new OffscreenCanvas(result.canvas.width, result.canvas.height);
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const ctx = canvas.getContext('2d');
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if (ctx) ctx.drawImage(result.canvas, 0, 0);
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const img = ctx ? ctx.getImageData(0, 0, result.canvas.width, result.canvas.height) : null;
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result.canvas = null; // must strip original canvas from return value as it cannot be transfered from worker thread
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if (img) postMessage({ result, image: img.data.buffer, width: msg.data.width, height: msg.data.height }, [img.data.buffer]);
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else postMessage({ result }); // send message back to main thread with canvas
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} else {
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postMessage({ result }); // send message back to main thread without canvas
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}
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busy = false;
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};
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