smart_render.py 文件源码

def clear(self, surface, bg):
        # make heavily used symbols local, avoid python performance hit
        split_rects_add = _split_rects_add
        spritelist = self._spritelist
        spritelist_len = len(spritelist)
        changed = self.lostsprites
        changed_append = changed.append

        for sprite in spritelist:
            if not sprite.last_state_changed():
                continue

            state = sprite.last_state
            changed_append(state.rect)

            i = sprite.zindex
            while i < spritelist_len:
                s2 = spritelist[i]
                i += 1

                if s2.dirty or not s2.visible:
                    continue

                r = state.rect.clip(s2.rect)
                if r:
                    r2 = Rect((r.left - s2.rect.left,
                               r.top - s2.rect.top),
                              r.size)
                    s2.damaged_areas.append((r, r2))
                    s2.damaged = True
        # for in spritelist

        changed.sort(_cmp_area)
        split_rects = []
        for r in changed:
            split_rects_add(split_rects, r)

        surface_blit = surface.blit
        dirty = []
        dirty_append = dirty.append
        for r in split_rects:
            r = surface_blit(bg, r, r)
            dirty_append(r)

            for s in spritelist:
                if s.dirty or s.damaged or not s.visible:
                    continue

                state = s.last_state
                r2 = r.clip(state.rect)
                if r2:
                    r3 = Rect(r2.left - s.rect.left, r2.top - s.rect.top,
                              r2.width, r2.height)
                    surface_blit(s.image, r2, r3)
            # for in spritelist
        # for in split_rects

        self.lostsprites = dirty
    # clear()