Merge pull request #101 from FoamyGuy/displayio_api_updates

displayio API update

Author: dhalbert

examples/imageload_netpbm.py

@@ -15,6 +15,7 @@
 import adafruit_ili9341
 import board
 import displayio
+import fourwire
 
 import adafruit_imageload
 
@@ -23,7 +24,7 @@
 tft_dc = board.D10
 
 displayio.release_displays()
-display_bus = displayio.FourWire(spi, command=tft_dc, chip_select=tft_cs)
+display_bus = fourwire.FourWire(spi, command=tft_dc, chip_select=tft_cs)
 
 display = adafruit_ili9341.ILI9341(display_bus, width=320, height=240)
 

tests/displayio_shared_bindings.py

@@ -50,6 +50,13 @@ def __init__(self, width: int, height: int, colors: int) -> None:
         self.height = height
         self.colors = colors
         self.data = {}
+        bits = 1
+        while (colors - 1) >> bits:
+            if bits < 8:
+                bits = bits << 1
+            else:
+                bits += 8
+        self._bits_per_value = bits
 
     def _abs_pos(self, width: int, height: int) -> int:
         if height >= self.height: