Update OnDiskBitmap usage to take a filename string in CP7

Author: lesamouraipourpre

CircuitPython_Pyloton/pyloton.py

@@ -154,7 +154,11 @@ def show_splash(self):
         """
         if self.debug:
             return
-        with open('blinka-pyloton.bmp', 'rb') as bitmap_file:
+
+        blinka_bitmap = "blinka-pyloton.bmp"
+
+        # Compatible with CircuitPython 6 & 7
+        with open(blinka_bitmap, 'rb') as bitmap_file:
             bitmap1 = displayio.OnDiskBitmap(bitmap_file)
             tile_grid = displayio.TileGrid(bitmap1, pixel_shader=getattr(bitmap1, 'pixel_shader', displayio.ColorConverter()))
             self.loading_group.append(tile_grid)
@@ -165,6 +169,16 @@ def show_splash(self):
             self.loading_group.append(rect)
             self.loading_group.append(status_heading)
 
+        # # Compatible with CircuitPython 7+
+        # bitmap1 = displayio.OnDiskBitmap(blinka_bitmap)
+        # tile_grid = displayio.TileGrid(bitmap1, pixel_shader=bitmap1.pixel_shader)
+        # self.loading_group.append(tile_grid)
+        # self.display.show(self.loading_group)
+        # status_heading = label.Label(font=self.arial16, x=80, y=175,
+        #                              text="Status", color=self.YELLOW)
+        # rect = Rect(0, 165, 240, 75, fill=self.PURPLE)
+        # self.loading_group.append(rect)
+        # self.loading_group.append(status_heading)
 
     def _load_fonts(self):
         """