Add support for fontio

adafruit_bitmap_font/bdf.py

@@ -40,7 +40,10 @@ Implementation Notes
 """
 
 import gc
-from displayio import Glyph
+try:
+    from displayio import Glyph
+except ImportError:
+    from fontio import Glyph
 from .glyph_cache import GlyphCache
 
 __version__ = "0.0.0-auto.0"

test/displayio.py

@@ -1,4 +1,3 @@
-import collections
 
 class Bitmap:
     def __init__(self, width, height, color_count):
@@ -20,5 +19,3 @@ class Bitmap:
 
     def __len__(self):
         return self.width * self.height
-
-Glyph = collections.namedtuple("Glyph", ["bitmap", "tile_index", "width", "height", "dx", "dy", "shift_x", "shift_y"])

test/fontio.py

@@ -0,0 +1,3 @@
+import collections
+
+Glyph = collections.namedtuple("Glyph", ["bitmap", "tile_index", "width", "height", "dx", "dy", "shift_x", "shift_y"])