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<?php
namespace Mpdf\Color;
class ColorModeConverter
{
/**
* @param float[] $c
*
* @return float[]
*/
public function rgb2gray($c)
{
if (isset($c[4])) {
return [1, ($c[1] * .21) + ($c[2] * .71) + ($c[3] * .07), ord(1), $c[4]];
}
return [1, ($c[1] * .21) + ($c[2] * .71) + ($c[3] * .07)];
}
/**
* @param float[] $c
*
* @return float[]
*/
public function cmyk2gray($c)
{
$rgb = $this->cmyk2rgb($c);
return $this->rgb2gray($rgb);
}
/**
* @param float[] $c
*
* @return float[]
*/
public function rgb2cmyk($c)
{
$cyan = 1 - ($c[1] / 255);
$magenta = 1 - ($c[2] / 255);
$yellow = 1 - ($c[3] / 255);
$min = min($cyan, $magenta, $yellow);
if ($min == 1) {
if ($c[0] == 5) {
return [6, 100, 100, 100, 100, $c[4]];
}
return [4, 100, 100, 100, 100];
// For K-Black
//if ($c[0]==5) { return array (6,0,0,0,100, $c[4]); }
//else { return array (4,0,0,0,100); }
}
$K = $min;
$black = 1 - $K;
if ($c[0] == 5) {
return [6, ($cyan - $K) * 100 / $black, ($magenta - $K) * 100 / $black, ($yellow - $K) * 100 / $black, $K * 100, $c[4]];
}
return [4, ($cyan - $K) * 100 / $black, ($magenta - $K) * 100 / $black, ($yellow - $K) * 100 / $black, $K * 100];
}
/**
* @param float[] $c
*
* @return float[]
*/
public function cmyk2rgb($c)
{
$rgb = [];
$colors = 255 - ($c[4] * 2.55);
$rgb[0] = (int) ($colors * (255 - ($c[1] * 2.55)) / 255);
$rgb[1] = (int) ($colors * (255 - ($c[2] * 2.55)) / 255);
$rgb[2] = (int) ($colors * (255 - ($c[3] * 2.55)) / 255);
if ($c[0] == 6) {
return [5, $rgb[0], $rgb[1], $rgb[2], $c[5]];
}
return [3, $rgb[0], $rgb[1], $rgb[2]];
}
/**
* @param float $r
* @param float $g
* @param float $b
*
* @return float[]
*/
public function rgb2hsl($r, $g, $b)
{
$h = 0;
$min = min($r, $g, $b);
$max = max($r, $g, $b);
$diff = $max - $min;
$l = ($max + $min) / 2;
if ($diff == 0) {
$h = 0;
$s = 0;
} else {
if ($l < 0.5) {
$s = $diff / ($max + $min);
} else {
$s = $diff / (2 - $max - $min);
}
$rDiff = ((($max - $r) / 6) + ($diff / 2)) / $diff;
$gDiff = ((($max - $g) / 6) + ($diff / 2)) / $diff;
$bDiff = ((($max - $b) / 6) + ($diff / 2)) / $diff;
if ($r == $max) {
$h = $bDiff - $gDiff;
} elseif ($g == $max) {
$h = (1 / 3) + $rDiff - $bDiff;
} elseif ($b == $max) {
$h = (2 / 3) + $gDiff - $rDiff;
}
if ($h < 0) {
++$h;
}
if ($h > 1) {
--$h;
}
}
return [$h, $s, $l];
}
/**
* Input is HSL value of complementary colour, held in $h2, $s, $l as fractions of 1
* Output is RGB in normal 255 255 255 format, held in $r, $g, $b
*
* @param float $h
* @param float $s
* @param float $l
*
* @return float[]
*/
public function hsl2rgb($h, $s, $l)
{
if ($s == 0) {
$r = $l * 255;
$g = $l * 255;
$b = $l * 255;
} else {
if ($l < 0.5) {
$tmp = $l * (1 + $s);
} else {
$tmp = ($l + $s) - ($s * $l);
}
$tmp2 = 2 * $l - $tmp;
$r = round(255 * $this->hue2rgb($tmp2, $tmp, $h + (1 / 3)));
$g = round(255 * $this->hue2rgb($tmp2, $tmp, $h));
$b = round(255 * $this->hue2rgb($tmp2, $tmp, $h - (1 / 3)));
}
return [$r, $g, $b];
}
/**
* @param float $v1
* @param float $v2
* @param float $vh
*
* @return float
*/
public function hue2rgb($v1, $v2, $vh)
{
if ($vh < 0) {
++$vh;
}
if ($vh > 1) {
--$vh;
}
if ((6 * $vh) < 1) {
return ($v1 + ($v2 - $v1) * 6 * $vh);
}
if ((2 * $vh) < 1) {
return $v2;
}
if ((3 * $vh) < 2) {
return ($v1 + ($v2 - $v1) * ((2 / 3 - $vh) * 6));
}
return $v1;
}
}