Merge pull request #2 from makermelissa/main

Optimized library to only draw changed pixels

Author: makermelissa

adafruit_pixel_framebuf.py

@@ -85,6 +85,7 @@ def __init__(
         )
 
         self._buffer = bytearray(width * height * 3)
+        self._double_buffer = bytearray(width * height * 3)
         super().__init__(
             self._buffer, width, height, buf_format=adafruit_framebuf.RGB888
         )
@@ -99,5 +100,12 @@ def display(self):
         for _y in range(self._height):
             for _x in range(self._width):
                 index = (_y * self.stride + _x) * 3
-                self._grid[(_x, _y)] = tuple(self._buffer[index : index + 3])
+                if (
+                    self._buffer[index : index + 3]
+                    != self._double_buffer[index : index + 3]
+                ):
+                    self._grid[(_x, _y)] = tuple(self._buffer[index : index + 3])
+                    self._double_buffer[index : index + 3] = self._buffer[
+                        index : index + 3
+                    ]
         self._grid.show()