Fix doc building

a non-default mock of displayio.Bitmap is provided for doc building

adafruit_pycamera/ironbow.py

@@ -6,6 +6,7 @@
 import displayio
 
 ironbow_palette = displayio.Palette(256)
+"""A palette often used to convert images to false color"""
 
 # fmt: off
 for i, pi in enumerate(

docs/api.rst

@@ -8,3 +8,5 @@
     :members:
 .. automodule:: adafruit_pycamera.imageprocessing
     :members:
+.. automodule:: adafruit_pycamera.ironbow
+    :members:

docs/conf.py

@@ -9,6 +9,7 @@
 import sys
 
 sys.path.insert(0, os.path.abspath(".."))
+sys.path.insert(0, os.path.abspath("mock"))
 
 # -- General configuration ------------------------------------------------
 
@@ -34,10 +35,10 @@
     "adafruit_lis3dh",
     "adafruit_ticks",
     "bitmaptools",
+    "bitmapfilter",
     "busdisplay",
     "busio",
     "digitalio",
-    "displayio",
     "espcamera",
     "fourwire",
     "micropython",

docs/mock/displayio.py

@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: 2024 Jeff Epler for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+
+class Palette:
+    def __init__(self, i):
+        self._data = [0] * i
+
+    def __setitem__(self, idx, value):
+        self._data[idx] = value