(sprito.py) Store part of the screen in SpriteRaw with store_rect()

sprito.py

@@ -36,6 +36,13 @@ class SpriteRaw(SpriteIndexed):
     def to_raw(self) -> None:
       return None
 
+def store_rect(x: int, y: int, w:int, h: int) -> SpriteRaw:
+  result = []
+  for i in range(y, y + h):
+    for j in range(x, x + w):
+      result.append(get_pixel(j, i))
+  return SpriteRaw(w, h, result)
+
 def rect(x: int, y: int, w: int, h: int, color: tuple) -> None:
   for i in range(x, x + w):
     for j in range(y, y + h):