node-ejs-renderer/node_modules/qrcode/lib/core/bit-matrix.js
2024-06-09 13:55:01 -04:00

66 lines
1.5 KiB
JavaScript

/**
* Helper class to handle QR Code symbol modules
*
* @param {Number} size Symbol size
*/
function BitMatrix (size) {
if (!size || size < 1) {
throw new Error('BitMatrix size must be defined and greater than 0')
}
this.size = size
this.data = new Uint8Array(size * size)
this.reservedBit = new Uint8Array(size * size)
}
/**
* Set bit value at specified location
* If reserved flag is set, this bit will be ignored during masking process
*
* @param {Number} row
* @param {Number} col
* @param {Boolean} value
* @param {Boolean} reserved
*/
BitMatrix.prototype.set = function (row, col, value, reserved) {
const index = row * this.size + col
this.data[index] = value
if (reserved) this.reservedBit[index] = true
}
/**
* Returns bit value at specified location
*
* @param {Number} row
* @param {Number} col
* @return {Boolean}
*/
BitMatrix.prototype.get = function (row, col) {
return this.data[row * this.size + col]
}
/**
* Applies xor operator at specified location
* (used during masking process)
*
* @param {Number} row
* @param {Number} col
* @param {Boolean} value
*/
BitMatrix.prototype.xor = function (row, col, value) {
this.data[row * this.size + col] ^= value
}
/**
* Check if bit at specified location is reserved
*
* @param {Number} row
* @param {Number} col
* @return {Boolean}
*/
BitMatrix.prototype.isReserved = function (row, col) {
return this.reservedBit[row * this.size + col]
}
module.exports = BitMatrix