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328 lines
12 KiB
328 lines
12 KiB
<?php
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/*
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* PHP QR Code encoder
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*
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* Masking
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*
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* Based on libqrencode C library distributed under LGPL 2.1
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* Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>
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*
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* PHP QR Code is distributed under LGPL 3
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* Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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define('N1', 3);
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define('N2', 3);
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define('N3', 40);
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define('N4', 10);
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class QRmask {
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public $runLength = array();
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//----------------------------------------------------------------------
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public function __construct()
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{
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$this->runLength = array_fill(0, QRSPEC_WIDTH_MAX + 1, 0);
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}
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//----------------------------------------------------------------------
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public function writeFormatInformation($width, &$frame, $mask, $level)
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{
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$blacks = 0;
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$format = QRspec::getFormatInfo($mask, $level);
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for($i=0; $i<8; $i++) {
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if($format & 1) {
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$blacks += 2;
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$v = 0x85;
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} else {
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$v = 0x84;
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}
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$frame[8][$width - 1 - $i] = chr($v);
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if($i < 6) {
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$frame[$i][8] = chr($v);
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} else {
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$frame[$i + 1][8] = chr($v);
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}
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$format = $format >> 1;
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}
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for($i=0; $i<7; $i++) {
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if($format & 1) {
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$blacks += 2;
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$v = 0x85;
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} else {
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$v = 0x84;
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}
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$frame[$width - 7 + $i][8] = chr($v);
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if($i == 0) {
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$frame[8][7] = chr($v);
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} else {
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$frame[8][6 - $i] = chr($v);
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}
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$format = $format >> 1;
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}
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return $blacks;
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}
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//----------------------------------------------------------------------
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public function mask0($x, $y) { return ($x+$y)&1; }
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public function mask1($x, $y) { return ($y&1); }
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public function mask2($x, $y) { return ($x%3); }
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public function mask3($x, $y) { return ($x+$y)%3; }
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public function mask4($x, $y) { return (((int)($y/2))+((int)($x/3)))&1; }
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public function mask5($x, $y) { return (($x*$y)&1)+($x*$y)%3; }
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public function mask6($x, $y) { return ((($x*$y)&1)+($x*$y)%3)&1; }
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public function mask7($x, $y) { return ((($x*$y)%3)+(($x+$y)&1))&1; }
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//----------------------------------------------------------------------
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private function generateMaskNo($maskNo, $width, $frame)
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{
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$bitMask = array_fill(0, $width, array_fill(0, $width, 0));
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for($y=0; $y<$width; $y++) {
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for($x=0; $x<$width; $x++) {
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if(ord($frame[$y][$x]) & 0x80) {
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$bitMask[$y][$x] = 0;
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} else {
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$maskFunc = call_user_func(array($this, 'mask'.$maskNo), $x, $y);
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$bitMask[$y][$x] = ($maskFunc == 0)?1:0;
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}
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}
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}
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return $bitMask;
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}
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//----------------------------------------------------------------------
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public static function serial($bitFrame)
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{
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$codeArr = array();
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foreach ($bitFrame as $line)
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$codeArr[] = join('', $line);
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return gzcompress(join("\n", $codeArr), 9);
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}
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//----------------------------------------------------------------------
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public static function unserial($code)
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{
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$codeArr = array();
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$codeLines = explode("\n", gzuncompress($code));
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foreach ($codeLines as $line)
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$codeArr[] = str_split($line);
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return $codeArr;
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}
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//----------------------------------------------------------------------
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public function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false)
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{
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$b = 0;
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$bitMask = array();
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$fileName = QR_CACHE_DIR.'mask_'.$maskNo.DIRECTORY_SEPARATOR.'mask_'.$width.'_'.$maskNo.'.dat';
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if (QR_CACHEABLE) {
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if (file_exists($fileName)) {
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$bitMask = self::unserial(file_get_contents($fileName));
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} else {
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$bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
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if (!file_exists(QR_CACHE_DIR.'mask_'.$maskNo))
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mkdir(QR_CACHE_DIR.'mask_'.$maskNo);
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file_put_contents($fileName, self::serial($bitMask));
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}
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} else {
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$bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
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}
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if ($maskGenOnly)
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return;
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$d = $s;
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for($y=0; $y<$width; $y++) {
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for($x=0; $x<$width; $x++) {
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if($bitMask[$y][$x] == 1) {
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$d[$y][$x] = chr(ord($s[$y][$x]) ^ (int)$bitMask[$y][$x]);
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}
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$b += (int)(ord($d[$y][$x]) & 1);
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}
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}
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return $b;
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}
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//----------------------------------------------------------------------
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public function makeMask($width, $frame, $maskNo, $level)
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{
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$masked = array_fill(0, $width, str_repeat("\0", $width));
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$this->makeMaskNo($maskNo, $width, $frame, $masked);
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$this->writeFormatInformation($width, $masked, $maskNo, $level);
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return $masked;
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}
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//----------------------------------------------------------------------
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public function calcN1N3($length)
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{
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$demerit = 0;
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for($i=0; $i<$length; $i++) {
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if($this->runLength[$i] >= 5) {
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$demerit += (N1 + ($this->runLength[$i] - 5));
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}
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if($i & 1) {
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if(($i >= 3) && ($i < ($length-2)) && ($this->runLength[$i] % 3 == 0)) {
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$fact = (int)($this->runLength[$i] / 3);
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if(($this->runLength[$i-2] == $fact) &&
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($this->runLength[$i-1] == $fact) &&
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($this->runLength[$i+1] == $fact) &&
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($this->runLength[$i+2] == $fact)) {
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if(($this->runLength[$i-3] < 0) || ($this->runLength[$i-3] >= (4 * $fact))) {
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$demerit += N3;
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} else if((($i+3) >= $length) || ($this->runLength[$i+3] >= (4 * $fact))) {
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$demerit += N3;
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}
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}
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}
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}
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}
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return $demerit;
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}
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//----------------------------------------------------------------------
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public function evaluateSymbol($width, $frame)
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{
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$head = 0;
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$demerit = 0;
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for($y=0; $y<$width; $y++) {
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$head = 0;
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$this->runLength[0] = 1;
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$frameY = $frame[$y];
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if ($y>0)
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$frameYM = $frame[$y-1];
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for($x=0; $x<$width; $x++) {
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if(($x > 0) && ($y > 0)) {
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$b22 = ord($frameY[$x]) & ord($frameY[$x-1]) & ord($frameYM[$x]) & ord($frameYM[$x-1]);
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$w22 = ord($frameY[$x]) | ord($frameY[$x-1]) | ord($frameYM[$x]) | ord($frameYM[$x-1]);
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if(($b22 | ($w22 ^ 1))&1) {
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$demerit += N2;
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}
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}
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if(($x == 0) && (ord($frameY[$x]) & 1)) {
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$this->runLength[0] = -1;
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$head = 1;
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$this->runLength[$head] = 1;
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} else if($x > 0) {
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if((ord($frameY[$x]) ^ ord($frameY[$x-1])) & 1) {
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$head++;
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$this->runLength[$head] = 1;
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} else {
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$this->runLength[$head]++;
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}
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}
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}
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$demerit += $this->calcN1N3($head+1);
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}
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for($x=0; $x<$width; $x++) {
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$head = 0;
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$this->runLength[0] = 1;
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for($y=0; $y<$width; $y++) {
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if($y == 0 && (ord($frame[$y][$x]) & 1)) {
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$this->runLength[0] = -1;
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$head = 1;
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$this->runLength[$head] = 1;
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} else if($y > 0) {
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if((ord($frame[$y][$x]) ^ ord($frame[$y-1][$x])) & 1) {
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$head++;
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$this->runLength[$head] = 1;
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} else {
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$this->runLength[$head]++;
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}
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}
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}
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$demerit += $this->calcN1N3($head+1);
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}
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return $demerit;
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}
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//----------------------------------------------------------------------
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public function mask($width, $frame, $level)
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{
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$minDemerit = PHP_INT_MAX;
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$bestMaskNum = 0;
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$bestMask = array();
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$checked_masks = array(0,1,2,3,4,5,6,7);
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if (QR_FIND_FROM_RANDOM !== false) {
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$howManuOut = 8-(QR_FIND_FROM_RANDOM % 9);
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for ($i = 0; $i < $howManuOut; $i++) {
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$remPos = rand (0, count($checked_masks)-1);
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unset($checked_masks[$remPos]);
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$checked_masks = array_values($checked_masks);
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}
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}
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$bestMask = $frame;
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foreach($checked_masks as $i) {
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$mask = array_fill(0, $width, str_repeat("\0", $width));
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$demerit = 0;
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$blacks = 0;
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$blacks = $this->makeMaskNo($i, $width, $frame, $mask);
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$blacks += $this->writeFormatInformation($width, $mask, $i, $level);
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$blacks = (int)(100 * $blacks / ($width * $width));
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$demerit = (int)((int)(abs($blacks - 50) / 5) * N4);
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$demerit += $this->evaluateSymbol($width, $mask);
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if($demerit < $minDemerit) {
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$minDemerit = $demerit;
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$bestMask = $mask;
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$bestMaskNum = $i;
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}
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}
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return $bestMask;
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}
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//----------------------------------------------------------------------
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}
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