1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
<?php
/**
* Class MaskPatternTester
*
* @filesource MaskPatternTester.php
* @created 22.11.2017
* @package chillerlan\QRCode\Data
* @author Smiley <smiley@chillerlan.net>
* @copyright 2017 Smiley
* @license MIT
*
* @noinspection PhpUnused
*/
namespace chillerlan\QRCode\Data;
use function abs, array_search, call_user_func_array, min;
/**
* Receives a QRDataInterface object and runs the mask pattern tests on it.
*
* ISO/IEC 18004:2000 Section 8.8.2 - Evaluation of masking results
*
* @see http://www.thonky.com/qr-code-tutorial/data-masking
*/
final class MaskPatternTester{
/**
* The data interface that contains the data matrix to test
*/
protected QRDataInterface $dataInterface;
/**
* Receives the QRDataInterface
*
* @see \chillerlan\QRCode\QROptions::$maskPattern
* @see \chillerlan\QRCode\Data\QRMatrix::$maskPattern
*/
public function __construct(QRDataInterface $dataInterface){
$this->dataInterface = $dataInterface;
}
/**
* shoves a QRMatrix through the MaskPatternTester to find the lowest penalty mask pattern
*
* @see \chillerlan\QRCode\Data\MaskPatternTester
*/
public function getBestMaskPattern():int{
$penalties = [];
for($pattern = 0; $pattern < 8; $pattern++){
$penalties[$pattern] = $this->testPattern($pattern);
}
return array_search(min($penalties), $penalties, true);
}
/**
* Returns the penalty for the given mask pattern
*
* @see \chillerlan\QRCode\QROptions::$maskPattern
* @see \chillerlan\QRCode\Data\QRMatrix::$maskPattern
*/
public function testPattern(int $pattern):int{
$matrix = $this->dataInterface->initMatrix($pattern, true);
$penalty = 0;
for($level = 1; $level <= 4; $level++){
$penalty += call_user_func_array([$this, 'testLevel'.$level], [$matrix->matrix(true), $matrix->size()]);
}
return (int)$penalty;
}
/**
* Checks for each group of five or more same-colored modules in a row (or column)
*/
protected function testLevel1(array $m, int $size):int{
$penalty = 0;
foreach($m as $y => $row){
foreach($row as $x => $val){
$count = 0;
for($ry = -1; $ry <= 1; $ry++){
if($y + $ry < 0 || $size <= $y + $ry){
continue;
}
for($rx = -1; $rx <= 1; $rx++){
if(($ry === 0 && $rx === 0) || (($x + $rx) < 0 || $size <= ($x + $rx))){
continue;
}
if($m[$y + $ry][$x + $rx] === $val){
$count++;
}
}
}
if($count > 5){
$penalty += (3 + $count - 5);
}
}
}
return $penalty;
}
/**
* Checks for each 2x2 area of same-colored modules in the matrix
*/
protected function testLevel2(array $m, int $size):int{
$penalty = 0;
foreach($m as $y => $row){
if($y > $size - 2){
break;
}
foreach($row as $x => $val){
if($x > $size - 2){
break;
}
if(
$val === $m[$y][$x + 1]
&& $val === $m[$y + 1][$x]
&& $val === $m[$y + 1][$x + 1]
){
$penalty++;
}
}
}
return 3 * $penalty;
}
/**
* Checks if there are patterns that look similar to the finder patterns (1:1:3:1:1 ratio)
*/
protected function testLevel3(array $m, int $size):int{
$penalties = 0;
foreach($m as $y => $row){
foreach($row as $x => $val){
if(
$x + 6 < $size
&& $val
&& !$m[$y][$x + 1]
&& $m[$y][$x + 2]
&& $m[$y][$x + 3]
&& $m[$y][$x + 4]
&& !$m[$y][$x + 5]
&& $m[$y][$x + 6]
){
$penalties++;
}
if(
$y + 6 < $size
&& $val
&& !$m[$y + 1][$x]
&& $m[$y + 2][$x]
&& $m[$y + 3][$x]
&& $m[$y + 4][$x]
&& !$m[$y + 5][$x]
&& $m[$y + 6][$x]
){
$penalties++;
}
}
}
return $penalties * 40;
}
/**
* Checks if more than half of the modules are dark or light, with a larger penalty for a larger difference
*/
protected function testLevel4(array $m, int $size):float{
$count = 0;
foreach($m as $y => $row){
foreach($row as $x => $val){
if($val){
$count++;
}
}
}
return (abs(100 * $count / $size / $size - 50) / 5) * 10;
}
}
|
