Cairo filter enm

cairo_filter_enm

 * Const CAIRO_FILTER_BEST = 2
 * Const CAIRO_FILTER_BILINEAR = 4
 * Const CAIRO_FILTER_FAST = 0
 * Const CAIRO_FILTER_GAUSSIAN = 5
 * Const CAIRO_FILTER_GOOD = 1
 * Const CAIRO_FILTER_NEAREST = 3