import { keySheet } from './src/lib/core/mask.js';
const W = 20, H = 10;
const data = new Uint8ClampedArray(W * H * 4);
for (let y = 0; y < H; y++)
	for (let x = 0; x < W; x++) {
		const i = (y * W + x) * 4;
		const inSlab = x >= 5 && x < 15 && y >= 2 && y < 8;
		if (inSlab) { data[i]=139; data[i+1]=90; data[i+2]=43; }
		else { data[i]=34; data[i+1]=139; data[i+2]=34; }
		data[i+3] = 255;
	}
const m = keySheet(data, { sheet: 'green', sensitivity: 50 });
console.log('row 5:', Array.from(m.slice(5*W, 6*W)));