The current approach without retained display lists is actually closer to the virtual-DOM diffing approach. i.e. Without retained display lists: - build up

The current approach without retained display lists is actually closer to the virtual-DOM diffing approach. i.e. Without retained display lists: - build up a display list of the entire scene. - diff this display list with the previous one to see what areas have changed. - paint the areas that have changed With retained display lists: - keep a list of elements that have changed - build a display list for part of the screen that have changed elements in them - merge the new partial display list into the old one - diff this display list with the previous to see what areas have changed - paint the areas that have changed