First public commit.

lenser/iigs/convert/shr.py

@@ -0,0 +1,19 @@
+"""Apple IIGS Super Hi-Res: 320x200, 16 colours/line from 16 palettes of 4096."""
+from __future__ import annotations
+
+from ...convert.base import Conversion
+from . import _common
+
+WIDTH, HEIGHT = 320, 200
+PIXEL_ASPECT = 1.0
+
+
+def convert(img_rgb, palette_name="iigs", dither_mode="floyd",
+            intensive=False, base_color=None):
+    block, preview, err = _common.encode(img_rgb, dither_mode, mono=False)
+    return Conversion(
+        mode="shr", width=WIDTH, height=HEIGHT, pixel_aspect=PIXEL_ASPECT,
+        index_image=None, data=block, data_addr=0x2000, viewer="iigs",
+        preview_rgb=preview, error=err,
+        meta={"palette": "iigs", "dither": dither_mode},
+    )