Custom_Image_Header::process_default_headers()

	public function process_default_headers() {
		global $_gc_default_headers;

		if ( ! isset( $_gc_default_headers ) ) {
			return;
		}

		if ( ! empty( $this->default_headers ) ) {
			return;
		}

		$this->default_headers    = $_gc_default_headers;
		$template_directory_uri   = get_template_directory_uri();
		$stylesheet_directory_uri = get_stylesheet_directory_uri();

		foreach ( array_keys( $this->default_headers ) as $header ) {
			$this->default_headers[ $header ]['url'] = sprintf(
				$this->default_headers[ $header ]['url'],
				$template_directory_uri,
				$stylesheet_directory_uri
			);

			$this->default_headers[ $header ]['thumbnail_url'] = sprintf(
				$this->default_headers[ $header ]['thumbnail_url'],
				$template_directory_uri,
				$stylesheet_directory_uri
			);
		}
	}