add color_image.py test for ColorBitMap widget

gui/demos/color_image.py

@@ -0,0 +1,44 @@
+# color_image.py Minimal micro-gui demo.
+
+# Released under the MIT License (MIT). See LICENSE.
+
+
+import hardware_setup  # Create a display instance
+
+from gui.core.ugui import Screen, ssd
+
+from gui.widgets import Label, Button, CloseButton
+from gui.widgets.color_bitmap import ColorBitMap
+from gui.core.writer import CWriter
+
+# Font for CWriter
+import gui.fonts.arial10 as arial10
+from gui.core.colors import *
+
+import test_bitmap
+
+
+class BaseScreen(Screen):
+
+    def __init__(self):
+        super().__init__()
+        # verbose default indicates if fast rendering is enabled
+        wri = CWriter(ssd, arial10, GREEN, BLACK)
+
+        image = ColorBitMap(
+            wri,
+            20,
+            0,
+            96,
+            318,
+        )
+        image.value(test_bitmap)
+        CloseButton(wri)  # Quit the application
+
+
+def test():
+    print("Color image demo for 170x320px display")
+    Screen.change(BaseScreen)  # A class is passed here, not an instance.
+
+
+test()