diff options
Diffstat (limited to 'lib/less.php/Tree/Color.php')
| -rw-r--r-- | lib/less.php/Tree/Color.php | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/lib/less.php/Tree/Color.php b/lib/less.php/Tree/Color.php new file mode 100644 index 0000000..77af07a --- /dev/null +++ b/lib/less.php/Tree/Color.php @@ -0,0 +1,230 @@ +<?php + +/** + * Color + * + * @package Less + * @subpackage tree + */ +class Less_Tree_Color extends Less_Tree{ + public $rgb; + public $alpha; + public $isTransparentKeyword; + public $type = 'Color'; + + public function __construct($rgb, $a = 1, $isTransparentKeyword = null ){ + + if( $isTransparentKeyword ){ + $this->rgb = $rgb; + $this->alpha = $a; + $this->isTransparentKeyword = true; + return; + } + + $this->rgb = array(); + if( is_array($rgb) ){ + $this->rgb = $rgb; + }else if( strlen($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 compile(){ + return $this; + } + + 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 = Less_Functions::fround( $this->alpha ); + + + // + // 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'; + } + + $values = array(); + foreach($this->rgb as $c){ + $values[] = Less_Functions::clamp( round($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 + */ + public function operate( $op, $other) { + $rgb = array(); + $alpha = $this->alpha * (1 - $other->alpha) + $other->alpha; + for ($c = 0; $c < 3; $c++) { + $rgb[$c] = Less_Functions::operate( $op, $this->rgb[$c], $other->rgb[$c]); + } + return new Less_Tree_Color($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 array('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 array('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( $argb ); + } + + public function compare($x){ + + if( !property_exists( $x, 'rgb' ) ){ + return -1; + } + + + return ($x->rgb[0] === $this->rgb[0] && + $x->rgb[1] === $this->rgb[1] && + $x->rgb[2] === $this->rgb[2] && + $x->alpha === $this->alpha) ? 0 : -1; + } + + public function toHex( $v ){ + + $ret = '#'; + foreach($v as $c){ + $c = Less_Functions::clamp( Less_Parser::round($c), 255); + if( $c < 16 ){ + $ret .= '0'; + } + $ret .= dechex($c); + } + + return $ret; + } + + + /** + * @param string $keyword + */ + public static function fromKeyword( $keyword ){ + $keyword = strtolower($keyword); + + if( Less_Colors::hasOwnProperty($keyword) ){ + // detect named color + return new Less_Tree_Color(substr(Less_Colors::color($keyword), 1)); + } + + if( $keyword === 'transparent' ){ + return new Less_Tree_Color( array(0, 0, 0), 0, true); + } + } + +} |