diff options
Diffstat (limited to 'library/phpqrcode/qrmask.php')
| -rw-r--r-- | library/phpqrcode/qrmask.php | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/library/phpqrcode/qrmask.php b/library/phpqrcode/qrmask.php new file mode 100644 index 000000000..b14d7ae16 --- /dev/null +++ b/library/phpqrcode/qrmask.php @@ -0,0 +1,328 @@ +<?php
+/*
+ * PHP QR Code encoder
+ *
+ * Masking
+ *
+ * Based on libqrencode C library distributed under LGPL 2.1
+ * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>
+ *
+ * PHP QR Code is distributed under LGPL 3
+ * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+ define('N1', 3);
+ define('N2', 3);
+ define('N3', 40);
+ define('N4', 10);
+
+ class QRmask {
+
+ public $runLength = array();
+
+ //----------------------------------------------------------------------
+ public function __construct()
+ {
+ $this->runLength = array_fill(0, QRSPEC_WIDTH_MAX + 1, 0);
+ }
+
+ //----------------------------------------------------------------------
+ public function writeFormatInformation($width, &$frame, $mask, $level)
+ {
+ $blacks = 0;
+ $format = QRspec::getFormatInfo($mask, $level);
+
+ for($i=0; $i<8; $i++) {
+ if($format & 1) {
+ $blacks += 2;
+ $v = 0x85;
+ } else {
+ $v = 0x84;
+ }
+
+ $frame[8][$width - 1 - $i] = chr($v);
+ if($i < 6) {
+ $frame[$i][8] = chr($v);
+ } else {
+ $frame[$i + 1][8] = chr($v);
+ }
+ $format = $format >> 1;
+ }
+
+ for($i=0; $i<7; $i++) {
+ if($format & 1) {
+ $blacks += 2;
+ $v = 0x85;
+ } else {
+ $v = 0x84;
+ }
+
+ $frame[$width - 7 + $i][8] = chr($v);
+ if($i == 0) {
+ $frame[8][7] = chr($v);
+ } else {
+ $frame[8][6 - $i] = chr($v);
+ }
+
+ $format = $format >> 1;
+ }
+
+ return $blacks;
+ }
+
+ //----------------------------------------------------------------------
+ public function mask0($x, $y) { return ($x+$y)&1; }
+ public function mask1($x, $y) { return ($y&1); }
+ public function mask2($x, $y) { return ($x%3); }
+ public function mask3($x, $y) { return ($x+$y)%3; }
+ public function mask4($x, $y) { return (((int)($y/2))+((int)($x/3)))&1; }
+ public function mask5($x, $y) { return (($x*$y)&1)+($x*$y)%3; }
+ public function mask6($x, $y) { return ((($x*$y)&1)+($x*$y)%3)&1; }
+ public function mask7($x, $y) { return ((($x*$y)%3)+(($x+$y)&1))&1; }
+
+ //----------------------------------------------------------------------
+ private function generateMaskNo($maskNo, $width, $frame)
+ {
+ $bitMask = array_fill(0, $width, array_fill(0, $width, 0));
+
+ for($y=0; $y<$width; $y++) {
+ for($x=0; $x<$width; $x++) {
+ if(ord($frame[$y][$x]) & 0x80) {
+ $bitMask[$y][$x] = 0;
+ } else {
+ $maskFunc = call_user_func(array($this, 'mask'.$maskNo), $x, $y);
+ $bitMask[$y][$x] = ($maskFunc == 0)?1:0;
+ }
+
+ }
+ }
+
+ return $bitMask;
+ }
+
+ //----------------------------------------------------------------------
+ public static function serial($bitFrame)
+ {
+ $codeArr = array();
+
+ foreach ($bitFrame as $line)
+ $codeArr[] = join('', $line);
+
+ return gzcompress(join("\n", $codeArr), 9);
+ }
+
+ //----------------------------------------------------------------------
+ public static function unserial($code)
+ {
+ $codeArr = array();
+
+ $codeLines = explode("\n", gzuncompress($code));
+ foreach ($codeLines as $line)
+ $codeArr[] = str_split($line);
+
+ return $codeArr;
+ }
+
+ //----------------------------------------------------------------------
+ public function makeMaskNo($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)
+ {
+ $masked = array_fill(0, $width, str_repeat("\0", $width));
+ $this->makeMaskNo($maskNo, $width, $frame, $masked);
+ $this->writeFormatInformation($width, $masked, $maskNo, $level);
+
+ return $masked;
+ }
+
+ //----------------------------------------------------------------------
+ public function calcN1N3($length)
+ {
+ $demerit = 0;
+
+ for($i=0; $i<$length; $i++) {
+
+ if($this->runLength[$i] >= 5) {
+ $demerit += (N1 + ($this->runLength[$i] - 5));
+ }
+ if($i & 1) {
+ if(($i >= 3) && ($i < ($length-2)) && ($this->runLength[$i] % 3 == 0)) {
+ $fact = (int)($this->runLength[$i] / 3);
+ if(($this->runLength[$i-2] == $fact) &&
+ ($this->runLength[$i-1] == $fact) &&
+ ($this->runLength[$i+1] == $fact) &&
+ ($this->runLength[$i+2] == $fact)) {
+ if(($this->runLength[$i-3] < 0) || ($this->runLength[$i-3] >= (4 * $fact))) {
+ $demerit += N3;
+ } else if((($i+3) >= $length) || ($this->runLength[$i+3] >= (4 * $fact))) {
+ $demerit += N3;
+ }
+ }
+ }
+ }
+ }
+ return $demerit;
+ }
+
+ //----------------------------------------------------------------------
+ public function evaluateSymbol($width, $frame)
+ {
+ $head = 0;
+ $demerit = 0;
+
+ for($y=0; $y<$width; $y++) {
+ $head = 0;
+ $this->runLength[0] = 1;
+
+ $frameY = $frame[$y];
+
+ if ($y>0)
+ $frameYM = $frame[$y-1];
+
+ for($x=0; $x<$width; $x++) {
+ if(($x > 0) && ($y > 0)) {
+ $b22 = ord($frameY[$x]) & ord($frameY[$x-1]) & ord($frameYM[$x]) & ord($frameYM[$x-1]);
+ $w22 = ord($frameY[$x]) | ord($frameY[$x-1]) | ord($frameYM[$x]) | ord($frameYM[$x-1]);
+
+ if(($b22 | ($w22 ^ 1))&1) {
+ $demerit += N2;
+ }
+ }
+ if(($x == 0) && (ord($frameY[$x]) & 1)) {
+ $this->runLength[0] = -1;
+ $head = 1;
+ $this->runLength[$head] = 1;
+ } else if($x > 0) {
+ if((ord($frameY[$x]) ^ ord($frameY[$x-1])) & 1) {
+ $head++;
+ $this->runLength[$head] = 1;
+ } else {
+ $this->runLength[$head]++;
+ }
+ }
+ }
+
+ $demerit += $this->calcN1N3($head+1);
+ }
+
+ for($x=0; $x<$width; $x++) {
+ $head = 0;
+ $this->runLength[0] = 1;
+
+ for($y=0; $y<$width; $y++) {
+ if($y == 0 && (ord($frame[$y][$x]) & 1)) {
+ $this->runLength[0] = -1;
+ $head = 1;
+ $this->runLength[$head] = 1;
+ } else if($y > 0) {
+ if((ord($frame[$y][$x]) ^ ord($frame[$y-1][$x])) & 1) {
+ $head++;
+ $this->runLength[$head] = 1;
+ } else {
+ $this->runLength[$head]++;
+ }
+ }
+ }
+
+ $demerit += $this->calcN1N3($head+1);
+ }
+
+ return $demerit;
+ }
+
+
+ //----------------------------------------------------------------------
+ public function mask($width, $frame, $level)
+ {
+ $minDemerit = PHP_INT_MAX;
+ $bestMaskNum = 0;
+ $bestMask = array();
+
+ $checked_masks = array(0,1,2,3,4,5,6,7);
+
+ if (QR_FIND_FROM_RANDOM !== false) {
+
+ $howManuOut = 8-(QR_FIND_FROM_RANDOM % 9);
+ for ($i = 0; $i < $howManuOut; $i++) {
+ $remPos = rand (0, count($checked_masks)-1);
+ unset($checked_masks[$remPos]);
+ $checked_masks = array_values($checked_masks);
+ }
+
+ }
+
+ $bestMask = $frame;
+
+ foreach($checked_masks as $i) {
+ $mask = array_fill(0, $width, str_repeat("\0", $width));
+
+ $demerit = 0;
+ $blacks = 0;
+ $blacks = $this->makeMaskNo($i, $width, $frame, $mask);
+ $blacks += $this->writeFormatInformation($width, $mask, $i, $level);
+ $blacks = (int)(100 * $blacks / ($width * $width));
+ $demerit = (int)((int)(abs($blacks - 50) / 5) * N4);
+ $demerit += $this->evaluateSymbol($width, $mask);
+
+ if($demerit < $minDemerit) {
+ $minDemerit = $demerit;
+ $bestMask = $mask;
+ $bestMaskNum = $i;
+ }
+ }
+
+ return $bestMask;
+ }
+
+ //----------------------------------------------------------------------
+ }
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