fix: slight optimization to get_bound and generic bbox

playa/page.py

@@ -1684,8 +1684,10 @@ def object_type(self):
 
     @property
     def bbox(self) -> Rect:
+        # These bboxes have already been computed in device space so
+        # we don't need all 4 corners!
         points = itertools.chain.from_iterable(
-            ((x0, y0), (x0, y1), (x1, y1), (x1, y0))
+            ((x0, y0), (x1, y1))
             for x0, y0, x1, y1 in (item.bbox for item in self)
         )
         return get_bound(points)

playa/utils.py

@@ -261,7 +261,7 @@ def get_bound(pts: Iterable[Point]) -> Rect:
     Raises:
       ValueError on empty input (as there is no bounding box).
     """
-    xs, ys = list(zip(*pts))
+    xs, ys = zip(*pts)
     x0 = min(xs)
     y0 = min(ys)
     x1 = max(xs)