First public commit.

lenser/a7800/convert/__init__.py

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+"""Atari 7800 conversion dispatch.
+
+The 7800's MARIA chip has its own architecture (display lists + zones + objects),
+nothing like ANTIC/GTIA -- but its 160A graphics mode is 2 bits/pixel, 4 px/byte,
+exactly the packing of ANTIC mode E (Atari GR.15).  So the per-mode encoders pack
+160x192 2bpp bitmaps the same way GR.15 does and reuse the Atari 256-colour NTSC
+palette + dither-aware selection; the MARIA-specific display lists are built by
+the cartridge packer (viewer/assemble.py).
+
+Modes: ``c160`` = 25-colour 160A (8 MARIA palettes, per-segment palette choice);
+``mono`` = luminance two-tone / tinted.
+"""
+from __future__ import annotations
+
+from ... import imageprep
+from . import c160, mono
+
+_MODULES = {"c160": c160, "mono": mono}
+MODES = list(_MODULES.keys())
+
+
+def convert_image(path_or_img, mode="c160", palette_name="ntsc",
+                  dither_mode="floyd", intensive=False, prep_opt=None,
+                  base_color=None):
+    prep_opt = prep_opt or imageprep.PrepOptions()
+    module = _MODULES.get(mode, c160)
+    img_rgb = imageprep.prepare(path_or_img, module.WIDTH, module.HEIGHT,
+                                module.PIXEL_ASPECT, prep_opt, border_rgb=(0, 0, 0))
+    return module.convert(img_rgb, palette_name, dither_mode, intensive,
+                          base_color=base_color)