QRImage.withMaskPattern constructor
      
      QRImage.withMaskPattern(
    
- QRCodeGenerate qrCode,
- int maskPattern
Generates a specific image for the qrCode and maskPattern.
Implementation
QRImage.withMaskPattern(QRCodeGenerate qrCode, this.maskPattern)
  : assert(maskPattern >= 0 && maskPattern <= 7),
    moduleCount = qrCode.moduleCount,
    typeNumber = qrCode.typeNumber,
    errorCorrectLevel = qrCode.errorCorrectLevel {
  _makeImpl(maskPattern, qrCode.dataCache, false);
}