66 lines
1.5 KiB
JavaScript
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
|