29 lines
575 B
JavaScript
29 lines
575 B
JavaScript
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self.addEventListener('message', function (e) {
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const { data: { i, arr: pixels } } = e;
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let store = {};
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let total = pixels.length / 4;
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const threshold = 200;
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for (let i = 0; i < total; i++) {
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const r = pixels[i * 4 + 0] > threshold ? 1 : 0;
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const g = pixels[i * 4 + 1] > threshold ? 1 : 0;
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const b = pixels[i * 4 + 2] > threshold ? 1 : 0;
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const id = r + "-" + g + "-" + b;
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store[id] = store[id] + 1 || 1;
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}
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Object.keys(store).forEach(k => {
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store[k] = store[k] / total;
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});
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self.postMessage({ res: store, i });
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}, false); |