Method makeMaskNo

text-to-qr/lib/phpqrcode/phpqrcode.php:2613–2648

----------------------------------------------------------------------

($maskNo, $width, $s, &$d, $maskGenOnly = false)

        
        //----------------------------------------------------------------------
        public function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false) 
        {
            $b = 0;
            $bitMask = array();
            
            $fileName = QR_CACHE_DIR.'mask_'.$maskNo.DIRECTORY_SEPARATOR.'mask_'.$width.'_'.$maskNo.'.dat';

            if (QR_CACHEABLE) {
                if (file_exists($fileName)) {
                    $bitMask = self::unserial(file_get_contents($fileName));
                } else {
                    $bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
                    if (!file_exists(QR_CACHE_DIR.'mask_'.$maskNo))
                        mkdir(QR_CACHE_DIR.'mask_'.$maskNo);
                    file_put_contents($fileName, self::serial($bitMask));
                }
            } else {
                $bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
            }

            if ($maskGenOnly)
                return;
                
            $d = $s;

            for($y=0; $y<$width; $y++) {
                for($x=0; $x<$width; $x++) {
                    if($bitMask[$y][$x] == 1) {
                        $d[$y][$x] = chr(ord($s[$y][$x]) ^ (int)$bitMask[$y][$x]);
                    }
                    $b += (int)(ord($d[$y][$x]) & 1);
                }
            }

            return $b;
        }
        
        //----------------------------------------------------------------------
        public function makeMask($width, $frame, $maskNo, $level)