qr-boolean-matrix-to-minitel-mosaic-bits.ts

import {encode} from "uqr"

let message = 'Lorem'
const {data: matrix} = encode(message)

function getSafeMatrixItemFlag(matrix: Array<Array<boolean>>, i: number, j: number): boolean {
  if (!matrix[i]) {
    return false
  }

  return matrix[i][j] || false
}

function splitBooleanMatrixIntoSubMatrices(matrix: Array<Array<boolean>>, subMatrixWidth: number = 2, subMatrixHeight = 3): boolean[][][] {
    const subMatrices: boolean[][][] = []
    for (let i = 0; i < matrix.length; i += subMatrixWidth) {
        const subMatrix: boolean[][] = []
        for (let j = 0; j < matrix.length; j += subMatrixHeight) {
            const subSubMatrix: boolean[] = []
            for (let k = 0; k < subMatrixWidth; k++) {
                for (let l = 0; l < subMatrixHeight; l++) {
                    subSubMatrix.push(getSafeMatrixItemFlag(matrix, i + k, j + l))
                }
            }
            subMatrix.push(subSubMatrix)
        }
        subMatrices.push(subMatrix)
    }

    return subMatrices
}

console.log(splitBooleanMatrixIntoSubMatrices(matrix))