/**
* Allocate a new color. Allocate with GD as needed and store
* previously allocated colors in $this->_colors.
*
* @param array $color The new current color
* @return int The allocated color
*/
private function _allocate_color($color)
{
if (isset($color["c"])) {
$color = Helpers::cmyk_to_rgb($color);
}
// Full opacity if no alpha set
if (!isset($color[3])) {
$color[3] = 0;
}
list($r, $g, $b, $a) = $color;
$r *= 255;
$g *= 255;
$b *= 255;
$a *= 127;
// Clip values
$r = $r > 255 ? 255 : $r;
$g = $g > 255 ? 255 : $g;
$b = $b > 255 ? 255 : $b;
$a = $a > 127 ? 127 : $a;
$r = $r < 0 ? 0 : $r;
$g = $g < 0 ? 0 : $g;
$b = $b < 0 ? 0 : $b;
$a = $a < 0 ? 0 : $a;
$key = sprintf("#%02X%02X%02X%02X", $r, $g, $b, $a);
if (isset($this->_colors[$key])) {
return $this->_colors[$key];
}
if ($a != 0) {
$this->_colors[$key] = imagecolorallocatealpha($this->get_image(), $r, $g, $b, $a);
} else {
$this->_colors[$key] = imagecolorallocate($this->get_image(), $r, $g, $b);
}
return $this->_colors[$key];
}
