Added App Icon

build_icon.py

@@ -0,0 +1,14 @@
+"""Package the original PNG in a Windows ICO without altering its pixels."""
+from pathlib import Path
+import struct
+
+root = Path(__file__).resolve().parent
+png = (root / "assets" / "sub-control-icon.png").read_bytes()
+if png[:8] != b"\x89PNG\r\n\x1a\n":
+    raise ValueError("Icon source must be PNG")
+width, height = struct.unpack(">II", png[16:24])
+if not (1 <= width <= 256 and 1 <= height <= 256):
+    raise ValueError("Windows icon source must be at most 256 x 256")
+header = struct.pack("<HHH", 0, 1, 1)
+entry = struct.pack("<BBBBHHII", width % 256, height % 256, 0, 0, 1, 32, len(png), 22)
+(root / "assets" / "sub-control.ico").write_bytes(header + entry + png)