getTopLeftOnBit() {
			const rowSize = this.rowSize;
			const bits = this.bits;
			let bitsOffset = 0;
			while (bitsOffset < bits.length && bits[bitsOffset] === 0) {
				bitsOffset++;
			}
			if (bitsOffset === bits.length) {
				return null;
			}
			const y = bitsOffset / rowSize;
			let x = (bitsOffset % rowSize) * 32;
			const theBits = bits[bitsOffset];
			let bit = 0;
			while (((theBits << (31 - bit)) & 0xFFFFFFFF) === 0) {
				bit++;
			}
			x += bit;
			return Int32Array.from([x, y]);
		}
This is useful in detecting a corner of a 'pure' barcode.

@return {@code x,y} coordinate of top-left-most 1 bit, or null if it is all white