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
|
<?php
namespace tubalmartin\CssMin;
class Utils
{
/**
* Clamps a number between a minimum and a maximum value.
* @param int|float $n the number to clamp
* @param int|float $min the lower end number allowed
* @param int|float $max the higher end number allowed
* @return int|float
*/
public static function clampNumber($n, $min, $max)
{
return min(max($n, $min), $max);
}
/**
* Clamps a RGB color number outside the sRGB color space
* @param int|float $n the number to clamp
* @return int|float
*/
public static function clampNumberSrgb($n)
{
return self::clampNumber($n, 0, 255);
}
/**
* Converts a HSL color into a RGB color
* @param array $hslValues
* @return array
*/
public static function hslToRgb($hslValues)
{
$h = floatval($hslValues[0]);
$s = floatval(str_replace('%', '', $hslValues[1]));
$l = floatval(str_replace('%', '', $hslValues[2]));
// Wrap and clamp, then fraction!
$h = ((($h % 360) + 360) % 360) / 360;
$s = self::clampNumber($s, 0, 100) / 100;
$l = self::clampNumber($l, 0, 100) / 100;
if ($s == 0) {
$r = $g = $b = self::roundNumber(255 * $l);
} else {
$v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l);
$v1 = (2 * $l) - $v2;
$r = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h + (1/3)));
$g = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h));
$b = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h - (1/3)));
}
return array($r, $g, $b);
}
/**
* Tests and selects the correct formula for each RGB color channel
* @param $v1
* @param $v2
* @param $vh
* @return mixed
*/
public static function hueToRgb($v1, $v2, $vh)
{
$vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh);
if ($vh * 6 < 1) {
return $v1 + ($v2 - $v1) * 6 * $vh;
}
if ($vh * 2 < 1) {
return $v2;
}
if ($vh * 3 < 2) {
return $v1 + ($v2 - $v1) * ((2 / 3) - $vh) * 6;
}
return $v1;
}
/**
* Convert strings like "64M" or "30" to int values
* @param mixed $size
* @return int
*/
public static function normalizeInt($size)
{
if (is_string($size)) {
$letter = substr($size, -1);
$size = intval($size);
switch ($letter) {
case 'M':
case 'm':
return (int) $size * 1048576;
case 'K':
case 'k':
return (int) $size * 1024;
case 'G':
case 'g':
return (int) $size * 1073741824;
}
}
return (int) $size;
}
/**
* Converts a string containing and RGB percentage value into a RGB integer value i.e. '90%' -> 229.5
* @param $rgbPercentage
* @return int
*/
public static function rgbPercentageToRgbInteger($rgbPercentage)
{
if (strpos($rgbPercentage, '%') !== false) {
$rgbPercentage = self::roundNumber(floatval(str_replace('%', '', $rgbPercentage)) * 2.55);
}
return intval($rgbPercentage, 10);
}
/**
* Converts a RGB color into a HEX color
* @param array $rgbColors
* @return array
*/
public static function rgbToHex($rgbColors)
{
$hexColors = array();
// Values outside the sRGB color space should be clipped (0-255)
for ($i = 0, $l = count($rgbColors); $i < $l; $i++) {
$hexColors[$i] = sprintf("%02x", self::clampNumberSrgb(self::rgbPercentageToRgbInteger($rgbColors[$i])));
}
return $hexColors;
}
/**
* Rounds a number to its closest integer
* @param $n
* @return int
*/
public static function roundNumber($n)
{
return intval(round(floatval($n)), 10);
}
}
|
