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<?php
/**
* Class MaskPatternTester
*
* @filesource MaskPatternTester.php
* @created 22.11.2017
* @package chillerlan\QRCode\Data
* @author Smiley <[email protected]>
* @copyright 2017 Smiley
* @license MIT
*/
namespace chillerlan\QRCode\Data;
use function abs, call_user_func_array;
/**
* The sole purpose of this class is to receive a QRMatrix object and run the pattern tests on it.
*
* @link http://www.thonky.com/qr-code-tutorial/data-masking
*/
class MaskPatternTester{
/**
* @var \chillerlan\QRCode\Data\QRMatrix
*/
protected $matrix;
/**
* @var int
*/
protected $moduleCount;
/**
* Receives the matrix an sets the module count
*
* @see \chillerlan\QRCode\QROptions::$maskPattern
* @see \chillerlan\QRCode\Data\QRMatrix::$maskPattern
* @see \chillerlan\QRCode\QRCode::getBestMaskPattern()
*
* @param \chillerlan\QRCode\Data\QRMatrix $matrix
*/
public function __construct(QRMatrix $matrix){
$this->matrix = $matrix;
$this->moduleCount = $this->matrix->size();
}
/**
* Returns the penalty for the given mask pattern
*
* @see \chillerlan\QRCode\QROptions::$maskPattern
* @see \chillerlan\QRCode\Data\QRMatrix::$maskPattern
* @see \chillerlan\QRCode\QRCode::getBestMaskPattern()
*
* @return int
*/
public function testPattern():int{
$penalty = 0;
for($level = 1; $level <= 4; $level++){
$penalty += call_user_func_array([$this, 'testLevel'.$level], [$this->matrix->matrix(true)]);
}
return (int)$penalty;
}
/**
* Checks for each group of five or more same-colored modules in a row (or column)
*
* @return int
*/
protected function testLevel1(array $m):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 || $this->moduleCount <= $y + $ry){
continue;
}
for($rx = -1; $rx <= 1; $rx++){
if(($ry === 0 && $rx === 0) || (($x + $rx) < 0 || $this->moduleCount <= ($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
*
* @return int
*/
protected function testLevel2(array $m):int{
$penalty = 0;
foreach($m as $y => $row){
if($y > ($this->moduleCount - 2)){
break;
}
foreach($row as $x => $val){
if($x > ($this->moduleCount - 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)
*
* @return int
*/
protected function testLevel3(array $m):int{
$penalties = 0;
foreach($m as $y => $row){
foreach($row as $x => $val){
if(
($x + 6) < $this->moduleCount
&& $val
&& !$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) < $this->moduleCount
&& $val
&& !$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
*
* @return float
*/
protected function testLevel4(array $m):float{
$count = 0;
foreach($m as $y => $row){
foreach($row as $x => $val){
if($val){
$count++;
}
}
}
return (abs(100 * $count / $this->moduleCount / $this->moduleCount - 50) / 5) * 10;
}
}
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