private function CSSmin::hsl_to_hex in Advanced CSS/JS Aggregation 8.2

Same name and namespace in other branches

1. 8.3 advagg_css_minify/yui/CSSMin.inc \CSSmin::hsl_to_hex()
2. 6 advagg_css_compress/yui/CSSMin.inc \CSSmin::hsl_to_hex()

File

advagg_css_minify/yui/CSSMin.inc, line 644

Class

CSSmin

Code

private function hsl_to_hex($matches) {
  $values = explode(',', str_replace('%', '', $matches[1]));
  $h = floatval($values[0]);
  $s = floatval($values[1]);
  $l = floatval($values[2]);

  // Wrap and clamp, then fraction!
  $h = ($h % 360 + 360) % 360 / 360;
  $s = $this
    ->clamp_number($s, 0, 100) / 100;
  $l = $this
    ->clamp_number($l, 0, 100) / 100;
  if ($s == 0) {
    $r = $g = $b = $this
      ->round_number(255 * $l);
  }
  else {
    $v2 = $l < 0.5 ? $l * (1 + $s) : $l + $s - $s * $l;
    $v1 = 2 * $l - $v2;
    $r = $this
      ->round_number(255 * $this
      ->hue_to_rgb($v1, $v2, $h + 1 / 3));
    $g = $this
      ->round_number(255 * $this
      ->hue_to_rgb($v1, $v2, $h));
    $b = $this
      ->round_number(255 * $this
      ->hue_to_rgb($v1, $v2, $h - 1 / 3));
  }
  return $this
    ->rgb_to_hex(array(
    '',
    $r . ',' . $g . ',' . $b,
    $matches[2],
  ));
}