first commit

toxpm.py

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+"""
+this is a minimal jpg/png->xpm converter
+so that you can make your pets with almost
+any program and convert it to xpm later
+"""
+
+from PIL import Image
+from typing import Any
+import sys
+import os
+import re
+
+def symbol_from_output(path: str) -> str:
+	base = os.path.splitext(os.path.basename(path))[0]
+	# e.g., idle_0 -> xpm_idle_0
+	clean = re.sub(r'[^a-zA-Z0-9_]', '_', base)
+	if not clean:
+		clean = "img"
+	return f"xpm_{clean}"
+
+def toxpm(input_path):
+	output_path = sys.argv[2] if len(sys.argv) >= 3 else "img.xpm"
+	symbol = symbol_from_output(output_path)
+
+	image = Image.open(input_path).convert("RGBA")
+	image = image.quantize(256).convert("RGBA") # xpm needs 256colours
+	width = image.size[0]
+	height = image.size[1]
+	pixels: Any = image.load()
+
+	colors = {}
+	next_char = 33  # start printable ascii
+
+	def next_symbol():
+		nonlocal next_char
+		while True:
+			char = chr(next_char)
+			next_char += 1
+			if char in ['"', "'", '\\']:
+				continue
+			break
+		return char
+
+	pixmap = []
+	for y in range(height):
+		row = []
+		for x in range(width):
+			rgba = pixels[x, y]
+			if rgba[3] < 128:
+				rgba = (0, 0, 0, 0)
+			if rgba not in colors:
+				colors[rgba] = next_symbol()
+			row.append(colors[rgba])
+		pixmap.append("".join(row))
+
+	with open(output_path, "w") as f:
+		# writing c
+		f.write("/* xpm */\n")
+		f.write(f"static const char* {symbol}[] = {{\n")
+		f.write(f"\"{width} {height} {len(colors)} 1\",\n")
+
+		for rgba, sym in colors.items():
+			if rgba[3] == 0:
+				f.write(f"\"{sym} c None\",\n")
+			else:
+				f.write(f"\"{sym} c #{rgba[0]:02x}{rgba[1]:02x}{rgba[2]:02x}\",\n")
+
+		for y, row in enumerate(pixmap):
+			line_end = "," if y < height - 1 else ""
+			f.write(f"\"{row}\"{line_end}\n")
+
+		f.write("};\n")
+
+	print(f"saved xpm: {output_path} (symbol: {symbol})")
+
+if len(sys.argv) < 2:
+	print("usage: toxpm.py <input.(jpg/png)> [output.xpm]")
+	sys.exit(1)
+
+toxpm(sys.argv[1])