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Color.php
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Color.php
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<?php
/**
* @private
*/
class Less_Tree_Color extends Less_Tree {
public $rgb;
public $alpha;
public $isTransparentKeyword;
public $value;
public function __construct( $rgb, $a = 1, $isTransparentKeyword = null, $originalForm = null ) {
if ( $isTransparentKeyword ) {
$this->rgb = $rgb;
$this->alpha = $a;
$this->isTransparentKeyword = true;
return;
}
if ( isset( $originalForm ) ) {
$this->value = $originalForm;
}
$this->rgb = [];
if ( is_array( $rgb ) ) {
$this->rgb = $rgb;
} elseif ( strlen( $rgb ) == 6 ) {
foreach ( str_split( $rgb, 2 ) as $c ) {
$this->rgb[] = hexdec( $c );
}
} else {
foreach ( str_split( $rgb, 1 ) as $c ) {
$this->rgb[] = hexdec( $c . $c );
}
}
$this->alpha = is_numeric( $a ) ? $a : 1;
}
public function luma() {
$r = $this->rgb[0] / 255;
$g = $this->rgb[1] / 255;
$b = $this->rgb[2] / 255;
$r = ( $r <= 0.03928 ) ? $r / 12.92 : pow( ( ( $r + 0.055 ) / 1.055 ), 2.4 );
$g = ( $g <= 0.03928 ) ? $g / 12.92 : pow( ( ( $g + 0.055 ) / 1.055 ), 2.4 );
$b = ( $b <= 0.03928 ) ? $b / 12.92 : pow( ( ( $b + 0.055 ) / 1.055 ), 2.4 );
return 0.2126 * $r + 0.7152 * $g + 0.0722 * $b;
}
/**
* @see Less_Tree::genCSS
*/
public function genCSS( $output ) {
$output->add( $this->toCSS() );
}
public function toCSS( $doNotCompress = false ) {
$compress = Less_Parser::$options['compress'] && !$doNotCompress;
$alpha = $this->fround( $this->alpha );
if ( $this->value ) {
return $this->value;
}
//
// If we have some transparency, the only way to represent it
// is via `rgba`. Otherwise, we use the hex representation,
// which has better compatibility with older browsers.
// Values are capped between `0` and `255`, rounded and zero-padded.
//
if ( $alpha < 1 ) {
if ( ( $alpha === 0 || $alpha === 0.0 ) && isset( $this->isTransparentKeyword ) && $this->isTransparentKeyword ) {
return 'transparent';
}
$values = [];
foreach ( $this->rgb as $c ) {
$values[] = $this->clamp( round( $c ), 255 );
}
$values[] = $alpha;
$glue = ( $compress ? ',' : ', ' );
return "rgba(" . implode( $glue, $values ) . ")";
} else {
$color = $this->toRGB();
if ( $compress ) {
// Convert color to short format
if ( $color[1] === $color[2] && $color[3] === $color[4] && $color[5] === $color[6] ) {
$color = '#' . $color[1] . $color[3] . $color[5];
}
}
return $color;
}
}
//
// Operations have to be done per-channel, if not,
// channels will spill onto each other. Once we have
// our result, in the form of an integer triplet,
// we create a new Color node to hold the result.
//
/**
* @param string $op
* @param self $other
*/
public function operate( $op, $other ) {
$rgb = [];
$alpha = $this->alpha * ( 1 - $other->alpha ) + $other->alpha;
for ( $c = 0; $c < 3; $c++ ) {
$rgb[$c] = $this->_operate( $op, $this->rgb[$c], $other->rgb[$c] );
}
return new self( $rgb, $alpha );
}
public function toRGB() {
return $this->toHex( $this->rgb );
}
public function toHSL() {
$r = $this->rgb[0] / 255;
$g = $this->rgb[1] / 255;
$b = $this->rgb[2] / 255;
$a = $this->alpha;
$max = max( $r, $g, $b );
$min = min( $r, $g, $b );
$l = ( $max + $min ) / 2;
$d = $max - $min;
$h = $s = 0;
if ( $max !== $min ) {
$s = $l > 0.5 ? $d / ( 2 - $max - $min ) : $d / ( $max + $min );
switch ( $max ) {
case $r:
$h = ( $g - $b ) / $d + ( $g < $b ? 6 : 0 );
break;
case $g:
$h = ( $b - $r ) / $d + 2;
break;
case $b:
$h = ( $r - $g ) / $d + 4;
break;
}
$h /= 6;
}
return [ 'h' => $h * 360, 's' => $s, 'l' => $l, 'a' => $a ];
}
// Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
public function toHSV() {
$r = $this->rgb[0] / 255;
$g = $this->rgb[1] / 255;
$b = $this->rgb[2] / 255;
$a = $this->alpha;
$max = max( $r, $g, $b );
$min = min( $r, $g, $b );
$v = $max;
$d = $max - $min;
if ( $max === 0 ) {
$s = 0;
} else {
$s = $d / $max;
}
$h = 0;
if ( $max !== $min ) {
switch ( $max ) {
case $r:
$h = ( $g - $b ) / $d + ( $g < $b ? 6 : 0 );
break;
case $g:
$h = ( $b - $r ) / $d + 2;
break;
case $b:
$h = ( $r - $g ) / $d + 4;
break;
}
$h /= 6;
}
return [ 'h' => $h * 360, 's' => $s, 'v' => $v, 'a' => $a ];
}
public function toARGB() {
$argb = array_merge( (array)Less_Parser::round( $this->alpha * 255 ), $this->rgb );
return $this->toHex( $argb );
}
/**
* @param mixed $x
* @return int|null
* @see less-2.5.3.js#Color.prototype.compare
*/
public function compare( $x ) {
if ( !$x instanceof self ) {
return -1;
}
return ( $x->rgb[0] === $this->rgb[0] &&
$x->rgb[1] === $this->rgb[1] &&
$x->rgb[2] === $this->rgb[2] &&
$x->alpha === $this->alpha ) ? 0 : null;
}
/**
* @param int|float $val
* @param int $max
* @return int|float
* @see less-2.5.3.js#Color.prototype
*/
private function clamp( $val, $max ) {
return min( max( $val, 0 ), $max );
}
public function toHex( $v ) {
$ret = '#';
foreach ( $v as $c ) {
$c = $this->clamp( Less_Parser::round( $c ), 255 );
if ( $c < 16 ) {
$ret .= '0';
}
$ret .= dechex( $c );
}
return $ret;
}
/**
* @param string $keyword
*/
public static function fromKeyword( $keyword ) {
$c = $keyword = strtolower( $keyword );
if ( Less_Colors::hasOwnProperty( $keyword ) ) {
// detect named color
$c = new self( substr( Less_Colors::color( $keyword ), 1 ) );
}
if ( $keyword === 'transparent' ) {
$c = new self( [ 0, 0, 0 ], 0, true );
}
if ( isset( $c ) && is_object( $c ) ) {
$c->value = $keyword;
return $c;
}
}
}

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Mime Type
text/x-php
Expires
Sat, May 16, 21:27 (1 d, 8 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
33/95/ee594abe80c7e571a27e66d2a5fb
Default Alt Text
Color.php (5 KB)

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