Working Python version for Commodore.

c64view/gallery.py

@@ -0,0 +1,29 @@
+"""Render every Mode x Palette x Dither variation of an image, for the GUI's
+"Explore variations" contact sheet.  Kept import-light (no Qt) so it can run in
+ProcessPoolExecutor worker processes.
+"""
+
+from __future__ import annotations
+
+from . import imageprep
+from .convert import MODES, render_preview, convert_image
+
+PALETTES = ["colodore", "pepto"]
+DITHERS = ["bayer", "floyd", "atkinson", "none"]
+
+# (mode, palette, dither) for every concrete mode (auto is excluded on purpose).
+COMBOS = [(m, p, d) for m in MODES for p in PALETTES for d in DITHERS]
+
+
+def render_variation(args):
+    """Worker entry point. ``args`` = (path, mode, palette, dither, prep_kwargs).
+
+    Returns (mode, palette, dither, error, rgb) where rgb is the displayed-
+    resolution (320x200) preview as a uint8 HxWx3 array.
+    """
+    path, mode, palette, dither, prep_kwargs = args
+    prep = imageprep.PrepOptions(**prep_kwargs)
+    conv = convert_image(path, mode=mode, palette_name=palette,
+                         dither_mode=dither, intensive=False, prep_opt=prep)
+    rgb = render_preview(conv, palette, scale=1)
+    return (mode, palette, dither, conv.error, rgb)