fix mono, not blue

Author: Matt Land

adafruit_imageload/pnm/__init__.py

@@ -42,11 +42,11 @@ def load(file, header, *, bitmap=None, palette=None):
         # We have all we need at length 3 for formats P2, P3, P5, P6
         if len(pnm_header) == 3:
             break
-        if len(pnm_header) == 2 and magic_number in [b"P1",  b"P4"]:
+        if len(pnm_header) == 2 and magic_number in [b"P1", b"P4"]:
             bitmap = bitmap(pnm_header[0], pnm_header[1], 1)
             if palette:
                 palette = palette(1)
-                palette[0] = 0xFF
+                palette[0] = b"\xFF\xFF\xFF"
             if magic_number.startswith(b"P1"):
                 from . import pbm_ascii
 

adafruit_imageload/tests/displayio_shared_bindings.py

@@ -83,6 +83,15 @@ def __setitem__(self, key, value):
             )
         self.colors[key] = value
 
+    def __getitem__(self, item):
+        if item >= self.num_colors:
+            raise ValueError(
+                f"palette index {item} should be less than {self.num_colors}"
+            )
+        if not self.colors.get(item):
+            raise ValueError(f"palette index {item} is not set")
+        return self.colors[item]
+
     def validate(self):
         if not self.colors:
             raise ValueError("no palette colors were set")

adafruit_imageload/tests/test_pbm_load.py

@@ -61,13 +61,14 @@ def test_load_works_p4_binary(self):
             bitmap, palette = pnm.load(
                 f, b"P4", bitmap=Bitmap_C_Interface, palette=Palette_C_Interface
             )
+        self.assertEqual(1, palette.num_colors)
+        palette.validate()
+        self.assertEqual(b"\xff\xff\xff", palette[0])
         self.assertTrue(isinstance(bitmap, Bitmap_C_Interface))
         self.assertEqual(1, bitmap.colors)
         self.assertEqual(32, bitmap.width)
         self.assertEqual(15, bitmap.height)
         bitmap.validate()
-        self.assertEqual(1, palette.num_colors)
-        palette.validate()
 
     def test_load_works_p4_binary_high_res(self):
         test_file = os.path.join(

adafruit_imageload/tests/test_pgm_load.py

@@ -41,7 +41,6 @@ def test_load_works_p5_binary(self):
                 f, b"P5", bitmap=Bitmap_C_Interface, palette=Palette_C_Interface
             )
         self.assertTrue(isinstance(bitmap, Bitmap_C_Interface), bitmap)
-        # self.fail(str(palette))
 
         self.assertEqual(8, palette.num_colors)
         palette.validate()