Merge pull request #4 from caternuson/buf_fix

add buf property

Author: ladyada

adafruit_pypixelbuf.py

@@ -95,6 +95,11 @@ def __init__(self, n, buf, byteorder="BGR", brightness=1.0,  # pylint: disable=t
             for i in range(0, self._pixels * 4, 4):
                 self._bytearray[i + self._offset] = DOTSTAR_LED_START_FULL_BRIGHT
 
+    @property
+    def buf(self):
+        """The brightness adjusted pixel buffer data."""
+        return bytearray([int(i * self.brightness) for i in self._bytearray])
+
     @staticmethod
     def parse_byteorder(byteorder):
         """