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
|
<?php
/**
* Class LuminanceSourceAbstract
*
* @created 24.01.2021
* @author ZXing Authors
* @author Ashot Khanamiryan
* @author Smiley <smiley@chillerlan.net>
* @copyright 2021 Smiley
* @license Apache-2.0
*/
namespace chillerlan\QRCode\Common;
use chillerlan\QRCode\Decoder\QRCodeDecoderException;
use chillerlan\QRCode\QROptions;
use chillerlan\Settings\SettingsContainerInterface;
use function array_slice, array_splice, file_exists, is_file, is_readable, realpath;
/**
* The purpose of this class hierarchy is to abstract different bitmap implementations across
* platforms into a standard interface for requesting greyscale luminance values.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
abstract class LuminanceSourceAbstract implements LuminanceSourceInterface{
/** @var \chillerlan\QRCode\QROptions|\chillerlan\Settings\SettingsContainerInterface */
protected SettingsContainerInterface $options;
protected array $luminances;
protected int $width;
protected int $height;
/**
*
*/
public function __construct(int $width, int $height, ?SettingsContainerInterface $options = null){
$this->width = $width;
$this->height = $height;
$this->options = ($options ?? new QROptions);
$this->luminances = [];
}
/** @inheritDoc */
public function getLuminances():array{
return $this->luminances;
}
/** @inheritDoc */
public function getWidth():int{
return $this->width;
}
/** @inheritDoc */
public function getHeight():int{
return $this->height;
}
/**
* @inheritDoc
* @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
*/
public function getRow(int $y):array{
if($y < 0 || $y >= $this->getHeight()){
throw new QRCodeDecoderException('Requested row is outside the image: '.$y);
}
$arr = [];
array_splice($arr, 0, $this->width, array_slice($this->luminances, ($y * $this->width), $this->width));
return $arr;
}
/**
*
*/
protected function setLuminancePixel(int $r, int $g, int $b):void{
$this->luminances[] = ($r === $g && $g === $b)
// Image is already greyscale, so pick any channel.
? $r // (($r + 128) % 256) - 128;
// Calculate luminance cheaply, favoring green.
: (($r + 2 * $g + $b) / 4); // (((($r + 2 * $g + $b) / 4) + 128) % 256) - 128;
}
/**
* @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
*/
protected static function checkFile(string $path):string{
$path = trim($path);
if(!file_exists($path) || !is_file($path) || !is_readable($path)){
throw new QRCodeDecoderException('invalid file: '.$path);
}
$realpath = realpath($path);
if($realpath === false){
throw new QRCodeDecoderException('unable to resolve path: '.$path);
}
return $realpath;
}
}
|
