rem: PRINT(("%s\n", __PRETTY_FUNCTION__));
context: clear_region(BRegion *region){	PRINT(("%s\n", __PRETTY_FUNCTION__));	region->count = 0;	region->bound.left = 0xfffffff;	region->bound.top = 0xfffffff;	region->bound.right = 0xf0000001;	region->bound.bottom = 0xf0000001;}