Merge pull request #1 from siehputz/use_bitmap_subscr

Use bitmap subscr

Author: tannewt

adafruit_imageload/bmp/indexed.py

@@ -47,7 +47,12 @@ def load(file, width, height, data_start, colors, color_depth, *, bitmap=None, p
 
         file.seek(data_start - colors * 4)
         for value in range(colors):
-            palette[value] = file.read(4)
+            c_bytes = file.read(4)
+            # Need to swap red & blue bytes (bytes 0 and 2)
+            palette[value] = bytes(b''.join([c_bytes[2:3],
+                                             c_bytes[1:2],
+                                             c_bytes[0:1],
+                                             c_bytes[3:1]]))
 
     if bitmap:
         minimum_color_depth = 1

examples/imageload_colorwheel.py

@@ -0,0 +1,17 @@
+import board
+import displayio
+import adafruit_imageload
+
+display = board.DISPLAY
+
+bitmap, palette = adafruit_imageload.load("images/color_wheel.bmp",
+                                          bitmap=displayio.Bitmap,
+                                          palette=displayio.Palette)
+
+tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)
+
+group = displayio.Group()
+group.append(tile_grid)
+display.show(group)
+while True:
+    pass