font_cache_filename;
		$legacy_cache_file = trailingslashit( $path ) . 'dompdf_font_family_cache.php'; // Dompdf <2.0

		if ( is_readable( $cache_file ) ) {
			$json_data = file_get_contents( $cache_file );
			$font_data = json_decode( $json_data, true );
		} elseif ( is_readable( $legacy_cache_file ) ) {
			$font_data = include $legacy_cache_file;
			@unlink( $legacy_cache_file );
		} else {
			$font_data = array();
		}

		// if include fails it returns false - we'll log an error in that case
		if ( $font_data === false ) {
			wcpdf_log_error( sprintf( "Could not read font cache file (%s)", $cache_file ), 'critical' );
		}

		// dompdf 1.1.X uses a closure to return the fonts, instead of a plain array (1.0.X and older)
		if ( ! is_array( $font_data ) && is_callable( $font_data ) ) {
			$font_data = $font_data( $fontDir, $rootDir );
		}

		return is_array( $font_data ) ? $this->normalize_font_paths( $font_data ) : array();
	}

	/**
	 * Get all fonts included in dompdf
	 *
	 * @return array
	 */
	public function get_dompdf_fonts() {
		$fonts = $this->dompdf->getFontMetrics()->getFontFamilies();
		return $this->normalize_font_paths( $fonts );
	}

	/**
	 * Get all fonts from the plugin (excluding base path!)
	 *
	 * @return array
	 */
	public function get_plugin_fonts() {
		return array (
			'open sans'   => array (
				'normal'      => 'OpenSans-Normal',
				'bold'        => 'OpenSans-Bold',
				'italic'      => 'OpenSans-Italic',
				'bold_italic' => 'OpenSans-BoldItalic',
			),
			'segoe'       => array (
				'normal'      => 'Segoe-Normal',
				'bold'        => 'Segoe-Bold',
				'italic'      => 'Segoe-Italic',
				'bold_italic' => 'Segoe-BoldItalic',
			),
			'roboto slab' => array (
				'normal'      => 'RobotoSlab-Normal',
				'bold'        => 'RobotoSlab-Bold',
				'italic'      => 'RobotoSlab-Italic',
				'bold_italic' => 'RobotoSlab-BoldItalic',
			),
			'currencies' => array (
				'normal'      => 'currencies',
				'bold'        => 'currencies',
				'italic'      => 'currencies',
				'bold_italic' => 'currencies',
			),
		);
	}

	/**
	 * Normalize a filesystem path.
	 * 
	 * @param  string $path Path to normalize.
	 * @return string Normalized path.
	 */
	public function normalize_path( $path ) {
		return function_exists( 'wp_normalize_path' ) ? wp_normalize_path( $path ) : str_replace('\\','/', $path );
	}

	/**
	 * Apply path normalization to a font list
	 * 
	 * @param  array  $fonts array of font entries
	 * @return array  Normalized array of font entries
	 */
	public function normalize_font_paths( $fonts ) {
		foreach( $fonts as $font_name => $filenames ) {
			if ( ! is_array( $filenames ) ) {
				continue;
			}
			foreach ( $filenames as $variant => $filename ) {
				$fonts[$font_name][$variant] = $this->normalize_path( $filename );
			}
		}
		return $fonts;
	}
}

endif; // class_exists