/**
* Convert an image URI to a base64-encoded data URI.
*
* @par Example:
* @code
* .fancy-button {
* background-image: embed('../images/button-bg.png');
* }
* @endcode
* @param array $frame
* @param lessc $less
* @return string
*/
public static function embed($frame, $less)
{
$base = pathinfo($less->parser->sourceName, PATHINFO_DIRNAME);
$url = trim($less->compileValue($frame), '"\'');
$file = realpath($base . '/' . $url);
$data = CSSMin::encodeImageAsDataURI($file);
$less->addParsedFile($file);
return CSSMin::buildUrlValue($data);
}
